/*
 * 
 *
 * Procedures for interfacing to Open Firmware.
 *
 * Paul Mackerras	August 1996.
 * Copyright (C) 1996 Paul Mackerras.
 * 
 *  Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
 *    {engebret|bergner}@us.ibm.com 
 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 */

#if 0
#define DEBUG_PROM
#endif

#include <stdarg.h>
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/version.h>
#include <linux/threads.h>
#include <linux/spinlock.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/proc_fs.h>
#include <linux/stringify.h>
#include <linux/delay.h>
#include <linux/initrd.h>
#include <asm/prom.h>
#include <asm/rtas.h>
#include <asm/lmb.h>
#include <asm/abs_addr.h>
#include <asm/page.h>
#include <asm/processor.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/smp.h>
#include <asm/system.h>
#include <asm/mmu.h>
#include <asm/pgtable.h>
#include <asm/bitops.h>
#include <asm/naca.h>
#include <asm/pci.h>
#include <asm/iommu.h>
#include <asm/bootinfo.h>
#include <asm/ppcdebug.h>
#include <asm/btext.h>
#include <asm/sections.h>
#include <asm/machdep.h>
#include "open_pic.h"

#ifdef CONFIG_LOGO_LINUX_CLUT224
#include <linux/linux_logo.h>
extern const struct linux_logo logo_linux_clut224;
#endif

/*
 * Properties whose value is longer than this get excluded from our
 * copy of the device tree. This value does need to be big enough to
 * ensure that we don't lose things like the interrupt-map property
 * on a PCI-PCI bridge.
 */
#define MAX_PROPERTY_LENGTH	(1UL * 1024 * 1024)

/*
 * prom_init() is called very early on, before the kernel text
 * and data have been mapped to KERNELBASE.  At this point the code
 * is running at whatever address it has been loaded at, so
 * references to extern and static variables must be relocated
 * explicitly.  The procedure reloc_offset() returns the address
 * we're currently running at minus the address we were linked at.
 * (Note that strings count as static variables.)
 *
 * Because OF may have mapped I/O devices into the area starting at
 * KERNELBASE, particularly on CHRP machines, we can't safely call
 * OF once the kernel has been mapped to KERNELBASE.  Therefore all
 * OF calls should be done within prom_init(), and prom_init()
 * and all routines called within it must be careful to relocate
 * references as necessary.
 *
 * Note that the bss is cleared *after* prom_init runs, so we have
 * to make sure that any static or extern variables it accesses
 * are put in the data segment.
 */


#define PROM_BUG() do { \
        prom_print(RELOC("kernel BUG at ")); \
        prom_print(RELOC(__FILE__)); \
        prom_print(RELOC(":")); \
        prom_print_hex(__LINE__); \
        prom_print(RELOC("!\n")); \
        __asm__ __volatile__(".long " BUG_ILLEGAL_INSTR); \
} while (0)



struct pci_reg_property {
	struct pci_address addr;
	u32 size_hi;
	u32 size_lo;
};


struct isa_reg_property {
	u32 space;
	u32 address;
	u32 size;
};

struct pci_intr_map {
	struct pci_address addr;
	u32 dunno;
	phandle int_ctrler;
	u32 intr;
};


typedef unsigned long interpret_func(struct device_node *, unsigned long,
				     int, int, int);

#ifndef FB_MAX			/* avoid pulling in all of the fb stuff */
#define FB_MAX	8
#endif

/* prom structure */
struct prom_t prom;

char *prom_display_paths[FB_MAX] __initdata = { 0, };
phandle prom_display_nodes[FB_MAX] __initdata;
unsigned int prom_num_displays = 0;
char *of_stdout_device = 0;

static int iommu_force_on;
int ppc64_iommu_off;

extern struct rtas_t rtas;
extern unsigned long klimit;
extern struct lmb lmb;

#define MAX_PHB (32 * 6)  /* 32 drawers * 6 PHBs/drawer */
struct of_tce_table of_tce_table[MAX_PHB + 1];

char *bootpath = 0;
char *bootdevice = 0;

int boot_cpuid = 0;
#define MAX_CPU_THREADS 2

struct device_node *allnodes = 0;
/* use when traversing tree through the allnext, child, sibling,
 * or parent members of struct device_node.
 */
static rwlock_t devtree_lock = RW_LOCK_UNLOCKED;

extern unsigned long reloc_offset(void);

extern void enter_prom(struct prom_args *args);
extern void copy_and_flush(unsigned long dest, unsigned long src,
			   unsigned long size, unsigned long offset);

unsigned long dev_tree_size;
unsigned long _get_PIR(void);

#ifdef CONFIG_HMT
struct {
	unsigned int pir;
	unsigned int threadid;
} hmt_thread_data[NR_CPUS];
#endif /* CONFIG_HMT */

char testString[] = "LINUX\n"; 


/* This is the one and *ONLY* place where we actually call open
 * firmware from, since we need to make sure we're running in 32b
 * mode when we do.  We switch back to 64b mode upon return.
 */

#define PROM_ERROR	(0x00000000fffffffful)

static unsigned long __init call_prom(const char *service, int nargs, int nret, ...)
{
	int i;
	unsigned long offset = reloc_offset();
	struct prom_t *_prom = PTRRELOC(&prom);
	va_list list;
        
	_prom->args.service = (u32)LONG_LSW(service);
	_prom->args.nargs = nargs;
	_prom->args.nret = nret;
        _prom->args.rets = (prom_arg_t *)&(_prom->args.args[nargs]);

        va_start(list, nret);
	for (i=0; i < nargs ;i++)
		_prom->args.args[i] = (prom_arg_t)LONG_LSW(va_arg(list, unsigned long));
        va_end(list);

	for (i=0; i < nret ;i++)
		_prom->args.rets[i] = 0;

	enter_prom(&_prom->args);

	return (unsigned long)((nret > 0) ? _prom->args.rets[0] : 0);
}


static void __init prom_print(const char *msg)
{
	const char *p, *q;
	unsigned long offset = reloc_offset();
	struct prom_t *_prom = PTRRELOC(&prom);

	if (_prom->stdout == 0)
		return;

	for (p = msg; *p != 0; p = q) {
		for (q = p; *q != 0 && *q != '\n'; ++q)
			;
		if (q > p)
			call_prom(RELOC("write"), 3, 1, _prom->stdout,
				  p, q - p);
		if (*q != 0) {
			++q;
			call_prom(RELOC("write"), 3, 1, _prom->stdout,
				  RELOC("\r\n"), 2);
		}
	}
}


static void __init prom_print_hex(unsigned long val)
{
        int i, nibbles = sizeof(val)*2;
        char buf[sizeof(val)*2+1];

        for (i = nibbles-1;  i >= 0;  i--) {
                buf[i] = (val & 0xf) + '0';
                if (buf[i] > '9')
                    buf[i] += ('a'-'0'-10);
                val >>= 4;
        }
        buf[nibbles] = '\0';
	prom_print(buf);
}


static void __init prom_print_nl(void)
{
	unsigned long offset = reloc_offset();
	prom_print(RELOC("\n"));
}


static void __init prom_panic(const char *reason)
{
	unsigned long offset = reloc_offset();

	prom_print(reason);
	/* ToDo: should put up an SRC here */
	call_prom(RELOC("exit"), 0, 0);

	for (;;)			/* should never get here */
		;
}


static int __init prom_next_node(phandle *nodep)
{
	phandle node;
	unsigned long offset = reloc_offset();

	if ((node = *nodep) != 0
	    && (*nodep = call_prom(RELOC("child"), 1, 1, node)) != 0)
		return 1;
	if ((*nodep = call_prom(RELOC("peer"), 1, 1, node)) != 0)
		return 1;
	for (;;) {
		if ((node = call_prom(RELOC("parent"), 1, 1, node)) == 0)
			return 0;
		if ((*nodep = call_prom(RELOC("peer"), 1, 1, node)) != 0)
			return 1;
	}
}


static void __init prom_initialize_naca(void)
{
	phandle node;
	char type[64];
        unsigned long num_cpus = 0;
        unsigned long offset = reloc_offset();
	struct prom_t *_prom = PTRRELOC(&prom);
        struct naca_struct *_naca = RELOC(naca);
        struct systemcfg *_systemcfg = RELOC(systemcfg);

	/* NOTE: _naca->debug_switch is already initialized. */
#ifdef DEBUG_PROM
	prom_print(RELOC("prom_initialize_naca: start...\n"));
#endif

	_naca->pftSize = 0;	/* ilog2 of htab size.  computed below. */

        for (node = 0; prom_next_node(&node); ) {
                type[0] = 0;
                call_prom(RELOC("getprop"), 4, 1, node, RELOC("device_type"),
                          type, sizeof(type));

                if (!strcmp(type, RELOC("cpu"))) {
			num_cpus += 1;

			/* We're assuming *all* of the CPUs have the same
			 * d-cache and i-cache sizes... -Peter
			 */
			if ( num_cpus == 1 ) {
				u32 size, lsize;

				call_prom(RELOC("getprop"), 4, 1, node,
					  RELOC("d-cache-size"),
					  &size, sizeof(size));

				if (_systemcfg->platform == PLATFORM_POWERMAC)
					call_prom(RELOC("getprop"), 4, 1, node,
						  RELOC("d-cache-block-size"),
						  &lsize, sizeof(lsize));
				else
					call_prom(RELOC("getprop"), 4, 1, node,
						  RELOC("d-cache-line-size"),
						  &lsize, sizeof(lsize));

				_systemcfg->dCacheL1Size = size;
				_systemcfg->dCacheL1LineSize = lsize;
				_naca->dCacheL1LogLineSize = __ilog2(lsize);
				_naca->dCacheL1LinesPerPage = PAGE_SIZE/lsize;

				call_prom(RELOC("getprop"), 4, 1, node,
					  RELOC("i-cache-size"),
					  &size, sizeof(size));

				if (_systemcfg->platform == PLATFORM_POWERMAC)
					call_prom(RELOC("getprop"), 4, 1, node,
						  RELOC("i-cache-block-size"),
						  &lsize, sizeof(lsize));
				else
					call_prom(RELOC("getprop"), 4, 1, node,
						  RELOC("i-cache-line-size"),
						  &lsize, sizeof(lsize));

				_systemcfg->iCacheL1Size = size;
				_systemcfg->iCacheL1LineSize = lsize;
				_naca->iCacheL1LogLineSize = __ilog2(lsize);
				_naca->iCacheL1LinesPerPage = PAGE_SIZE/lsize;

				if (_systemcfg->platform == PLATFORM_PSERIES_LPAR) {
					u32 pft_size[2];
					call_prom(RELOC("getprop"), 4, 1, node, 
						  RELOC("ibm,pft-size"),
						  &pft_size, sizeof(pft_size));
				/* pft_size[0] is the NUMA CEC cookie */
					_naca->pftSize = pft_size[1];
				}
			}
                } else if (!strcmp(type, RELOC("serial"))) {
			phandle isa, pci;
			struct isa_reg_property reg;
			union pci_range ranges;

			if (_systemcfg->platform == PLATFORM_POWERMAC)
				continue;
			type[0] = 0;
			call_prom(RELOC("getprop"), 4, 1, node,
				  RELOC("ibm,aix-loc"), type, sizeof(type));

			if (strcmp(type, RELOC("S1")))
				continue;

			call_prom(RELOC("getprop"), 4, 1, node, RELOC("reg"),
				  &reg, sizeof(reg));

			isa = call_prom(RELOC("parent"), 1, 1, node);
			if (!isa)
				PROM_BUG();
			pci = call_prom(RELOC("parent"), 1, 1, isa);
			if (!pci)
				PROM_BUG();

			call_prom(RELOC("getprop"), 4, 1, pci, RELOC("ranges"),
				  &ranges, sizeof(ranges));

			if ( _prom->encode_phys_size == 32 )
				_naca->serialPortAddr = ranges.pci32.phys+reg.address;
			else {
				_naca->serialPortAddr = 
					((((unsigned long)ranges.pci64.phys_hi) << 32) |
					 (ranges.pci64.phys_lo)) + reg.address;
			}
                }
	}

	if (_systemcfg->platform == PLATFORM_POWERMAC)
		_naca->interrupt_controller = IC_OPEN_PIC;
	else {
		_naca->interrupt_controller = IC_INVALID;
		for (node = 0; prom_next_node(&node); ) {
			type[0] = 0;
			call_prom(RELOC("getprop"), 4, 1, node, RELOC("name"),
				  type, sizeof(type));
			if (strcmp(type, RELOC("interrupt-controller")))
				continue;
			call_prom(RELOC("getprop"), 4, 1, node, RELOC("compatible"),
				  type, sizeof(type));
			if (strstr(type, RELOC("open-pic")))
				_naca->interrupt_controller = IC_OPEN_PIC;
			else if (strstr(type, RELOC("ppc-xicp")))
				_naca->interrupt_controller = IC_PPC_XIC;
			else
				prom_print(RELOC("prom: failed to recognize"
						 " interrupt-controller\n"));
			break;
		}
	}

	if (_naca->interrupt_controller == IC_INVALID) {
		prom_print(RELOC("prom: failed to find interrupt-controller\n"));
		PROM_BUG();
	}

	/* We gotta have at least 1 cpu... */
        if ( (_systemcfg->processorCount = num_cpus) < 1 )
                PROM_BUG();

	_systemcfg->physicalMemorySize = lmb_phys_mem_size();

	if (_systemcfg->platform == PLATFORM_PSERIES ||
	    _systemcfg->platform == PLATFORM_POWERMAC) {
		unsigned long rnd_mem_size, pteg_count;

		/* round mem_size up to next power of 2 */
		rnd_mem_size = 1UL << __ilog2(_systemcfg->physicalMemorySize);
		if (rnd_mem_size < _systemcfg->physicalMemorySize)
			rnd_mem_size <<= 1;

		/* # pages / 2 */
		pteg_count = (rnd_mem_size >> (12 + 1));

		_naca->pftSize = __ilog2(pteg_count << 7);
	}

	if (_naca->pftSize == 0) {
		prom_print(RELOC("prom: failed to compute pftSize!\n"));
		PROM_BUG();
	}

	/* 
	 * Hardcode to GP size.  I am not sure where to get this info
	 * in general, as there does not appear to be a slb-size OF
	 * entry.  At least in Condor and earlier.  DRENG 
	 */
	_naca->slb_size = 64;

	/* Add an eye catcher and the systemcfg layout version number */
	strcpy(_systemcfg->eye_catcher, RELOC("SYSTEMCFG:PPC64"));
	_systemcfg->version.major = SYSTEMCFG_MAJOR;
	_systemcfg->version.minor = SYSTEMCFG_MINOR;
	_systemcfg->processor = _get_PVR();

#ifdef DEBUG_PROM
        prom_print(RELOC("systemcfg->processorCount       = 0x"));
        prom_print_hex(_systemcfg->processorCount);
        prom_print_nl();

        prom_print(RELOC("systemcfg->physicalMemorySize   = 0x"));
        prom_print_hex(_systemcfg->physicalMemorySize);
        prom_print_nl();

        prom_print(RELOC("naca->pftSize                   = 0x"));
        prom_print_hex(_naca->pftSize);
        prom_print_nl();

        prom_print(RELOC("systemcfg->dCacheL1LineSize     = 0x"));
        prom_print_hex(_systemcfg->dCacheL1LineSize);
        prom_print_nl();

        prom_print(RELOC("systemcfg->iCacheL1LineSize     = 0x"));
        prom_print_hex(_systemcfg->iCacheL1LineSize);
        prom_print_nl();

        prom_print(RELOC("naca->serialPortAddr            = 0x"));
        prom_print_hex(_naca->serialPortAddr);
        prom_print_nl();

        prom_print(RELOC("naca->interrupt_controller      = 0x"));
        prom_print_hex(_naca->interrupt_controller);
        prom_print_nl();

        prom_print(RELOC("systemcfg->platform             = 0x"));
        prom_print_hex(_systemcfg->platform);
        prom_print_nl();

	prom_print(RELOC("prom_initialize_naca: end...\n"));
#endif
}


static void __init early_cmdline_parse(void)
{
	unsigned long offset = reloc_offset();
	char *opt;
#ifndef CONFIG_PMAC_DART
	struct systemcfg *_systemcfg = RELOC(systemcfg);
#endif

	opt = strstr(RELOC(cmd_line), RELOC("iommu="));
	if (opt) {
		prom_print(RELOC("opt is:"));
		prom_print(opt);
		prom_print(RELOC("\n"));
		opt += 6;
		while (*opt && *opt == ' ')
			opt++;
		if (!strncmp(opt, RELOC("off"), 3))
			RELOC(ppc64_iommu_off) = 1;
		else if (!strncmp(opt, RELOC("force"), 5))
			RELOC(iommu_force_on) = 1;
	}

#ifndef CONFIG_PMAC_DART
	if (_systemcfg->platform == PLATFORM_POWERMAC) {
		RELOC(ppc64_iommu_off) = 1;
		prom_print(RELOC("DART disabled on PowerMac !\n"));
	}
#endif
}

#ifdef DEBUG_PROM
void prom_dump_lmb(void)
{
        unsigned long i;
        unsigned long offset = reloc_offset();
	struct lmb *_lmb  = PTRRELOC(&lmb);

        prom_print(RELOC("\nprom_dump_lmb:\n"));
        prom_print(RELOC("    memory.cnt                  = 0x"));
        prom_print_hex(_lmb->memory.cnt);
	prom_print_nl();
        prom_print(RELOC("    memory.size                 = 0x"));
        prom_print_hex(_lmb->memory.size);
	prom_print_nl();
        for (i=0; i < _lmb->memory.cnt ;i++) {
                prom_print(RELOC("    memory.region[0x"));
		prom_print_hex(i);
		prom_print(RELOC("].base       = 0x"));
                prom_print_hex(_lmb->memory.region[i].base);
		prom_print_nl();
                prom_print(RELOC("                      .physbase = 0x"));
                prom_print_hex(_lmb->memory.region[i].physbase);
		prom_print_nl();
                prom_print(RELOC("                      .size     = 0x"));
                prom_print_hex(_lmb->memory.region[i].size);
		prom_print_nl();
        }

	prom_print_nl();
        prom_print(RELOC("    reserved.cnt                  = 0x"));
        prom_print_hex(_lmb->reserved.cnt);
	prom_print_nl();
        prom_print(RELOC("    reserved.size                 = 0x"));
        prom_print_hex(_lmb->reserved.size);
	prom_print_nl();
        for (i=0; i < _lmb->reserved.cnt ;i++) {
                prom_print(RELOC("    reserved.region[0x"));
		prom_print_hex(i);
		prom_print(RELOC("].base       = 0x"));
                prom_print_hex(_lmb->reserved.region[i].base);
		prom_print_nl();
                prom_print(RELOC("                      .physbase = 0x"));
                prom_print_hex(_lmb->reserved.region[i].physbase);
		prom_print_nl();
                prom_print(RELOC("                      .size     = 0x"));
                prom_print_hex(_lmb->reserved.region[i].size);
		prom_print_nl();
        }
}
#endif /* DEBUG_PROM */

static void __init prom_initialize_lmb(void)
{
	phandle node;
	char type[64];
        unsigned long i, offset = reloc_offset();
	struct prom_t *_prom = PTRRELOC(&prom);
        struct systemcfg *_systemcfg = RELOC(systemcfg);
	union lmb_reg_property reg;
	unsigned long lmb_base, lmb_size;
	unsigned long num_regs, bytes_per_reg = (_prom->encode_phys_size*2)/8;

	lmb_init();

	/* XXX Quick HACK. Proper fix is to drop those structures and properly use
	 * #address-cells. PowerMac has #size-cell set to 1 and #address-cells to 2
	 */
	if (_systemcfg->platform == PLATFORM_POWERMAC)
		bytes_per_reg = 12;

        for (node = 0; prom_next_node(&node); ) {
                type[0] = 0;
                call_prom(RELOC("getprop"), 4, 1, node, RELOC("device_type"),
                          type, sizeof(type));

                if (strcmp(type, RELOC("memory")))
			continue;

		num_regs = call_prom(RELOC("getprop"), 4, 1, node, RELOC("reg"),
			&reg, sizeof(reg)) / bytes_per_reg;

		for (i=0; i < num_regs ;i++) {
			if (_systemcfg->platform == PLATFORM_POWERMAC) {
				lmb_base = ((unsigned long)reg.addrPM[i].address_hi) << 32;
				lmb_base |= (unsigned long)reg.addrPM[i].address_lo;
				lmb_size = reg.addrPM[i].size;
			} else if (_prom->encode_phys_size == 32) {
				lmb_base = reg.addr32[i].address;
				lmb_size = reg.addr32[i].size;
			} else {
				lmb_base = reg.addr64[i].address;
				lmb_size = reg.addr64[i].size;
			}

			/* We limit memory to 2GB if the IOMMU is off */
			if (RELOC(ppc64_iommu_off)) {
				if (lmb_base >= 0x80000000UL)
					continue;

				if ((lmb_base + lmb_size) > 0x80000000UL)
					lmb_size = 0x80000000UL - lmb_base;
			}

			if (lmb_add(lmb_base, lmb_size) < 0)
				prom_print(RELOC("Too many LMB's, discarding this one...\n"));
		}

	}

	lmb_analyze();
#ifdef DEBUG_PROM
	prom_dump_lmb();
#endif /* DEBUG_PROM */
}

static char hypertas_funcs[1024];

static void __init
prom_instantiate_rtas(void)
{
	unsigned long offset = reloc_offset();
	struct prom_t *_prom = PTRRELOC(&prom);
	struct rtas_t *_rtas = PTRRELOC(&rtas);
	struct systemcfg *_systemcfg = RELOC(systemcfg);
	ihandle prom_rtas;
        u32 getprop_rval;

#ifdef DEBUG_PROM
	prom_print(RELOC("prom_instantiate_rtas: start...\n"));
#endif
	prom_rtas = (ihandle)call_prom(RELOC("finddevice"), 1, 1, RELOC("/rtas"));
	if (prom_rtas != (ihandle) -1) {
		unsigned long x;
		x = call_prom(RELOC("getprop"),
				  4, 1, prom_rtas,
				  RELOC("ibm,hypertas-functions"), 
				  hypertas_funcs, 
			      sizeof(hypertas_funcs));

		if (x != PROM_ERROR) {
			prom_print(RELOC("Hypertas detected, assuming LPAR !\n"));
			_systemcfg->platform = PLATFORM_PSERIES_LPAR;
		}

		call_prom(RELOC("getprop"), 
			  4, 1, prom_rtas,
			  RELOC("rtas-size"), 
			  &getprop_rval, 
			  sizeof(getprop_rval));
	        _rtas->size = getprop_rval;
		prom_print(RELOC("instantiating rtas"));
		if (_rtas->size != 0) {
			unsigned long rtas_region = RTAS_INSTANTIATE_MAX;

			/* Grab some space within the first RTAS_INSTANTIATE_MAX bytes
			 * of physical memory (or within the RMO region) because RTAS
			 * runs in 32-bit mode and relocate off.
			 */
			if ( _systemcfg->platform == PLATFORM_PSERIES_LPAR ) {
				struct lmb *_lmb  = PTRRELOC(&lmb);
				rtas_region = min(_lmb->rmo_size, RTAS_INSTANTIATE_MAX);
			}

			_rtas->base = lmb_alloc_base(_rtas->size, PAGE_SIZE, rtas_region);

			prom_print(RELOC(" at 0x"));
			prom_print_hex(_rtas->base);

			prom_rtas = (ihandle)call_prom(RELOC("open"), 
					      	1, 1, RELOC("/rtas"));
			prom_print(RELOC("..."));

			if (call_prom(RELOC("call-method"), 3, 2,
						      RELOC("instantiate-rtas"),
						      prom_rtas,
						      _rtas->base) != PROM_ERROR) {
				_rtas->entry = (long)_prom->args.rets[1];
			}
			RELOC(rtas_rmo_buf)
				= lmb_alloc_base(RTAS_RMOBUF_MAX, PAGE_SIZE,
							rtas_region);
		}

		if (_rtas->entry <= 0) {
			prom_print(RELOC(" failed\n"));
		} else {
			prom_print(RELOC(" done\n"));
		}

#ifdef DEBUG_PROM
        	prom_print(RELOC("rtas->base                 = 0x"));
        	prom_print_hex(_rtas->base);
        	prom_print_nl();
        	prom_print(RELOC("rtas->entry                = 0x"));
        	prom_print_hex(_rtas->entry);
        	prom_print_nl();
        	prom_print(RELOC("rtas->size                 = 0x"));
        	prom_print_hex(_rtas->size);
        	prom_print_nl();
#endif
	}
#ifdef DEBUG_PROM
	prom_print(RELOC("prom_instantiate_rtas: end...\n"));
#endif
}


#ifdef CONFIG_PMAC_DART
static void __init prom_initialize_dart_table(void)
{
	unsigned long offset = reloc_offset();
	extern unsigned long dart_tablebase;
	extern unsigned long dart_tablesize;

	/* Only reserve DART space if machine has more than 2GB of RAM
	 * or if requested with iommu=on on cmdline.
	 */
	if (lmb_end_of_DRAM() <= 0x80000000ull && !RELOC(iommu_force_on))
		return;

	/* 512 pages (2MB) is max DART tablesize. */
	RELOC(dart_tablesize) = 1UL << 21;
	/* 16MB (1 << 24) alignment. We allocate a full 16Mb chuck since we
	 * will blow up an entire large page anyway in the kernel mapping
	 */
	RELOC(dart_tablebase) = (unsigned long)
		abs_to_virt(lmb_alloc_base(1UL<<24, 1UL<<24, 0x80000000L));

	prom_print(RELOC("Dart at: "));
	prom_print_hex(RELOC(dart_tablebase));
	prom_print(RELOC("\n"));
}
#endif /* CONFIG_PMAC_DART */

static void __init prom_initialize_tce_table(void)
{
	phandle node;
	ihandle phb_node;
        unsigned long offset = reloc_offset();
	char compatible[64], path[64], type[64], model[64];
	unsigned long i, table = 0;
	unsigned long base, vbase, align;
	unsigned int minalign, minsize;
	struct of_tce_table *prom_tce_table = RELOC(of_tce_table);
	unsigned long tce_entry, *tce_entryp;

	if (RELOC(ppc64_iommu_off))
		return;

#ifdef DEBUG_PROM
	prom_print(RELOC("starting prom_initialize_tce_table\n"));
#endif

	/* Search all nodes looking for PHBs. */
	for (node = 0; prom_next_node(&node); ) {
		if (table == MAX_PHB) {
			prom_print(RELOC("WARNING: PCI host bridge ignored, "
				         "need to increase MAX_PHB\n"));
			continue;
		}

		compatible[0] = 0;
		type[0] = 0;
		model[0] = 0;
		call_prom(RELOC("getprop"), 4, 1, node, RELOC("compatible"),
			  compatible, sizeof(compatible));
		call_prom(RELOC("getprop"), 4, 1, node, RELOC("device_type"),
			  type, sizeof(type));
		call_prom(RELOC("getprop"), 4, 1, node, RELOC("model"),
			  model, sizeof(model));

		/* Keep the old logic in tack to avoid regression. */
		if (compatible[0] != 0) {
			if((strstr(compatible, RELOC("python")) == NULL) &&
			   (strstr(compatible, RELOC("Speedwagon")) == NULL) &&
			   (strstr(compatible, RELOC("Winnipeg")) == NULL))
				continue;
		} else if (model[0] != 0) {
			if ((strstr(model, RELOC("ython")) == NULL) &&
			    (strstr(model, RELOC("peedwagon")) == NULL) &&
			    (strstr(model, RELOC("innipeg")) == NULL))
				continue;
		}

		if ((type[0] == 0) || (strstr(type, RELOC("pci")) == NULL)) {
			continue;
		}

		if (call_prom(RELOC("getprop"), 4, 1, node, 
			     RELOC("tce-table-minalign"), &minalign, 
			     sizeof(minalign)) == PROM_ERROR) {
			minalign = 0;
		}

		if (call_prom(RELOC("getprop"), 4, 1, node, 
			     RELOC("tce-table-minsize"), &minsize, 
			     sizeof(minsize)) == PROM_ERROR) {
			minsize = 4UL << 20;
		}

		/*
		 * Even though we read what OF wants, we just set the table
		 * size to 4 MB.  This is enough to map 2GB of PCI DMA space.
		 * By doing this, we avoid the pitfalls of trying to DMA to
		 * MMIO space and the DMA alias hole.
		 *
		 * On POWER4, firmware sets the TCE region by assuming
		 * each TCE table is 8MB. Using this memory for anything
		 * else will impact performance, so we always allocate 8MB.
		 * Anton
		 */
		if (__is_processor(PV_POWER4) || __is_processor(PV_POWER4p))
			minsize = 8UL << 20;
		else
			minsize = 4UL << 20;

		/* Align to the greater of the align or size */
		align = max(minalign, minsize);

		/* Carve out storage for the TCE table. */
		base = lmb_alloc(minsize, align);

		if ( !base ) {
			prom_panic(RELOC("ERROR, cannot find space for TCE table.\n"));
		}

		vbase = (unsigned long)abs_to_virt(base);

		/* Save away the TCE table attributes for later use. */
		prom_tce_table[table].node = node;
		prom_tce_table[table].base = vbase;
		prom_tce_table[table].size = minsize;

#ifdef DEBUG_PROM
		prom_print(RELOC("TCE table: 0x"));
		prom_print_hex(table);
		prom_print_nl();

		prom_print(RELOC("\tnode = 0x"));
		prom_print_hex(node);
		prom_print_nl();

		prom_print(RELOC("\tbase = 0x"));
		prom_print_hex(vbase);
		prom_print_nl();

		prom_print(RELOC("\tsize = 0x"));
		prom_print_hex(minsize);
		prom_print_nl();
#endif

		/* Initialize the table to have a one-to-one mapping
		 * over the allocated size.
		 */
		tce_entryp = (unsigned long *)base;
		for (i = 0; i < (minsize >> 3) ;tce_entryp++, i++) {
			tce_entry = (i << PAGE_SHIFT);
			tce_entry |= 0x3;
			*tce_entryp = tce_entry;
		}

		/* It seems OF doesn't null-terminate the path :-( */
		memset(path, 0, sizeof(path));
		/* Call OF to setup the TCE hardware */
		if (call_prom(RELOC("package-to-path"), 3, 1, node,
                             path, sizeof(path)-1) == PROM_ERROR) {
                        prom_print(RELOC("package-to-path failed\n"));
                } else {
                        prom_print(RELOC("opening PHB "));
                        prom_print(path);
                }

                phb_node = (ihandle)call_prom(RELOC("open"), 1, 1, path);
                if ( (long)phb_node <= 0) {
                        prom_print(RELOC("... failed\n"));
                } else {
                        prom_print(RELOC("... done\n"));
                }
                call_prom(RELOC("call-method"), 6, 0,
                             RELOC("set-64-bit-addressing"),
			     phb_node,
			     -1,
                             minsize, 
                             base & 0xffffffff,
                             (base >> 32) & 0xffffffff);
                call_prom(RELOC("close"), 1, 0, phb_node);

		table++;
	}

	/* Flag the first invalid entry */
	prom_tce_table[table].node = 0;
#ifdef DEBUG_PROM
	prom_print(RELOC("ending prom_initialize_tce_table\n"));
#endif
}

/*
 * With CHRP SMP we need to use the OF to start the other
 * processors so we can't wait until smp_boot_cpus (the OF is
 * trashed by then) so we have to put the processors into
 * a holding pattern controlled by the kernel (not OF) before
 * we destroy the OF.
 *
 * This uses a chunk of low memory, puts some holding pattern
 * code there and sends the other processors off to there until
 * smp_boot_cpus tells them to do something.  The holding pattern
 * checks that address until its cpu # is there, when it is that
 * cpu jumps to __secondary_start().  smp_boot_cpus() takes care
 * of setting those values.
 *
 * We also use physical address 0x4 here to tell when a cpu
 * is in its holding pattern code.
 *
 * Fixup comment... DRENG / PPPBBB - Peter
 *
 * -- Cort
 */
static void __init prom_hold_cpus(unsigned long mem)
{
	unsigned long i;
	unsigned int reg;
	phandle node;
	unsigned long offset = reloc_offset();
	char type[64], *path;
	int cpuid = 0;
	unsigned int interrupt_server[MAX_CPU_THREADS];
	unsigned int cpu_threads, hw_cpu_num;
	int propsize;
	extern void __secondary_hold(void);
        extern unsigned long __secondary_hold_spinloop;
        extern unsigned long __secondary_hold_acknowledge;
        unsigned long *spinloop
		= (void *)virt_to_abs(&__secondary_hold_spinloop);
        unsigned long *acknowledge
		= (void *)virt_to_abs(&__secondary_hold_acknowledge);
        unsigned long secondary_hold
		= virt_to_abs(*PTRRELOC((unsigned long *)__secondary_hold));
        struct systemcfg *_systemcfg = RELOC(systemcfg);
	struct paca_struct *_xPaca = PTRRELOC(&paca[0]);
	struct prom_t *_prom = PTRRELOC(&prom);
#ifdef CONFIG_SMP
	struct naca_struct *_naca = RELOC(naca);
#endif

	/* On pmac, we just fill out the various global bitmasks and
	 * arrays indicating our CPUs are here, they are actually started
	 * later on from pmac_smp
	 */
	if (_systemcfg->platform == PLATFORM_POWERMAC) {
		for (node = 0; prom_next_node(&node); ) {
			type[0] = 0;
			call_prom(RELOC("getprop"), 4, 1, node, RELOC("device_type"),
				  type, sizeof(type));
			if (strcmp(type, RELOC("cpu")) != 0)
				continue;
			reg = -1;
			call_prom(RELOC("getprop"), 4, 1, node, RELOC("reg"),
				  &reg, sizeof(reg));
			_xPaca[cpuid].xHwProcNum = reg;

#ifdef CONFIG_SMP
			cpu_set(cpuid, RELOC(cpu_available_map));
			cpu_set(cpuid, RELOC(cpu_possible_map));
			cpu_set(cpuid, RELOC(cpu_present_at_boot));
			if (reg == 0)
				cpu_set(cpuid, RELOC(cpu_online_map));
#endif /* CONFIG_SMP */
			cpuid++;
		}
		return;
	}

	/* Initially, we must have one active CPU. */
	_systemcfg->processorCount = 1;

#ifdef DEBUG_PROM
	prom_print(RELOC("prom_hold_cpus: start...\n"));
	prom_print(RELOC("    1) spinloop       = 0x"));
	prom_print_hex((unsigned long)spinloop);
	prom_print_nl();
	prom_print(RELOC("    1) *spinloop      = 0x"));
	prom_print_hex(*spinloop);
	prom_print_nl();
	prom_print(RELOC("    1) acknowledge    = 0x"));
	prom_print_hex((unsigned long)acknowledge);
	prom_print_nl();
	prom_print(RELOC("    1) *acknowledge   = 0x"));
	prom_print_hex(*acknowledge);
	prom_print_nl();
	prom_print(RELOC("    1) secondary_hold = 0x"));
	prom_print_hex(secondary_hold);
	prom_print_nl();
#endif

        /* Set the common spinloop variable, so all of the secondary cpus
	 * will block when they are awakened from their OF spinloop.
	 * This must occur for both SMP and non SMP kernels, since OF will
	 * be trashed when we move the kernel.
         */
        *spinloop = 0;

#ifdef CONFIG_HMT
	for (i=0; i < NR_CPUS; i++) {
		RELOC(hmt_thread_data)[i].pir = 0xdeadbeef;
	}
#endif
	/* look for cpus */
	for (node = 0; prom_next_node(&node); ) {
		type[0] = 0;
		call_prom(RELOC("getprop"), 4, 1, node, RELOC("device_type"),
			  type, sizeof(type));
		if (strcmp(type, RELOC("cpu")) != 0)
			continue;

		/* Skip non-configured cpus. */
		call_prom(RELOC("getprop"), 4, 1, node, RELOC("status"),
			  type, sizeof(type));
		if (strcmp(type, RELOC("okay")) != 0)
			continue;

                reg = -1;
		call_prom(RELOC("getprop"), 4, 1, node, RELOC("reg"),
			  &reg, sizeof(reg));

		path = (char *) mem;
		memset(path, 0, 256);
		if ((long) call_prom(RELOC("package-to-path"), 3, 1,
				     node, path, 255) == PROM_ERROR)
			continue;

#ifdef DEBUG_PROM
		prom_print_nl();
		prom_print(RELOC("cpuid        = 0x"));
		prom_print_hex(cpuid);
		prom_print_nl();
		prom_print(RELOC("cpu hw idx   = 0x"));
		prom_print_hex(reg);
		prom_print_nl();
#endif
		_xPaca[cpuid].xHwProcNum = reg;

		/* Init the acknowledge var which will be reset by
		 * the secondary cpu when it awakens from its OF
		 * spinloop.
		 */
		*acknowledge = (unsigned long)-1;

		propsize = call_prom(RELOC("getprop"), 4, 1, node,
				     RELOC("ibm,ppc-interrupt-server#s"), 
				     &interrupt_server, 
				     sizeof(interrupt_server));
		if (propsize < 0) {
			/* no property.  old hardware has no SMT */
			cpu_threads = 1;
			interrupt_server[0] = reg; /* fake it with phys id */
		} else {
			/* We have a threaded processor */
			cpu_threads = propsize / sizeof(u32);
			if (cpu_threads > MAX_CPU_THREADS) {
				prom_print(RELOC("SMT: too many threads!\nSMT: found "));
				prom_print_hex(cpu_threads);
				prom_print(RELOC(", max is "));
				prom_print_hex(MAX_CPU_THREADS);
				prom_print_nl();
				cpu_threads = 1; /* ToDo: panic? */
			}
		}

		hw_cpu_num = interrupt_server[0];
		if (hw_cpu_num != _prom->cpu) {
			/* Primary Thread of non-boot cpu */
			prom_print_hex(cpuid);
			prom_print(RELOC(" : starting cpu "));
			prom_print(path);
			prom_print(RELOC("... "));
			call_prom(RELOC("start-cpu"), 3, 0, node, 
				  secondary_hold, cpuid);

			for ( i = 0 ; (i < 100000000) && 
			      (*acknowledge == ((unsigned long)-1)); i++ ) ;

			if (*acknowledge == cpuid) {
				prom_print(RELOC("... done\n"));
				/* We have to get every CPU out of OF,
				 * even if we never start it. */
				if (cpuid >= NR_CPUS)
					goto next;
#ifdef CONFIG_SMP
				/* Set the number of active processors. */
				_systemcfg->processorCount++;
				cpu_set(cpuid, RELOC(cpu_available_map));
				cpu_set(cpuid, RELOC(cpu_possible_map));
				cpu_set(cpuid, RELOC(cpu_present_at_boot));
#endif
			} else {
				prom_print(RELOC("... failed: "));
				prom_print_hex(*acknowledge);
				prom_print_nl();
			}
		}
#ifdef CONFIG_SMP
		else {
			prom_print_hex(cpuid);
			prom_print(RELOC(" : booting  cpu "));
			prom_print(path);
			prom_print_nl();
			cpu_set(cpuid, RELOC(cpu_available_map));
			cpu_set(cpuid, RELOC(cpu_possible_map));
			cpu_set(cpuid, RELOC(cpu_online_map));
			cpu_set(cpuid, RELOC(cpu_present_at_boot));
		}
#endif
next:
#ifdef CONFIG_SMP
		/* Init paca for secondary threads.   They start later. */
		for (i=1; i < cpu_threads; i++) {
			cpuid++;
			if (cpuid >= NR_CPUS)
				continue;
			_xPaca[cpuid].xHwProcNum = interrupt_server[i];
			prom_print_hex(interrupt_server[i]);
			prom_print(RELOC(" : preparing thread ... "));
			if (_naca->smt_state) {
				cpu_set(cpuid, RELOC(cpu_available_map));
				cpu_set(cpuid, RELOC(cpu_present_at_boot));
				prom_print(RELOC("available"));
			} else {
				prom_print(RELOC("not available"));
			}
			prom_print_nl();
		}
#endif
		cpuid++;
	}
#ifdef CONFIG_HMT
	/* Only enable HMT on processors that provide support. */
	if (__is_processor(PV_PULSAR) || 
	    __is_processor(PV_ICESTAR) ||
	    __is_processor(PV_SSTAR)) {
		prom_print(RELOC("    starting secondary threads\n"));

		for (i = 0; i < NR_CPUS; i += 2) {
			if (!cpu_online(i))
				continue;

			if (i == 0) {
				unsigned long pir = _get_PIR();
				if (__is_processor(PV_PULSAR)) {
					RELOC(hmt_thread_data)[i].pir = 
						pir & 0x1f;
				} else {
					RELOC(hmt_thread_data)[i].pir = 
						pir & 0x3ff;
				}
			}
/* 			cpu_set(i+1, cpu_online_map); */
			cpu_set(i+1, RELOC(cpu_possible_map));
		}
		_systemcfg->processorCount *= 2;
	} else {
		prom_print(RELOC("Processor is not HMT capable\n"));
	}
#endif

	if (cpuid >= NR_CPUS)
		prom_print(RELOC("WARNING: maximum CPUs (" __stringify(NR_CPUS)
				 ") exceeded: ignoring extras\n"));

#ifdef DEBUG_PROM
	prom_print(RELOC("prom_hold_cpus: end...\n"));
#endif
}

static void __init smt_setup(void)
{
	char *p, *q;
	char my_smt_enabled = SMT_DYNAMIC;
	ihandle prom_options = NULL;
	char option[9];
	unsigned long offset = reloc_offset();
        struct naca_struct *_naca = RELOC(naca);
	char found = 0;

	if (strstr(RELOC(cmd_line), RELOC("smt-enabled="))) {
		for (q = RELOC(cmd_line); (p = strstr(q, RELOC("smt-enabled="))) != 0; ) {
			q = p + 12;
			if (p > RELOC(cmd_line) && p[-1] != ' ')
				continue;
			found = 1;
			if (q[0] == 'o' && q[1] == 'f' && 
			    q[2] == 'f' && (q[3] == ' ' || q[3] == '\0')) {
				my_smt_enabled = SMT_OFF;
			} else if (q[0]=='o' && q[1] == 'n' && 
				   (q[2] == ' ' || q[2] == '\0')) {
				my_smt_enabled = SMT_ON;
			} else {
				my_smt_enabled = SMT_DYNAMIC;
			} 
		}
	}
	if (!found) {
		prom_options = (ihandle)call_prom(RELOC("finddevice"), 1, 1, RELOC("/options"));
		if (prom_options != (ihandle) -1) {
			call_prom(RELOC("getprop"), 
				4, 1, prom_options,
				RELOC("ibm,smt-enabled"), 
				option, 
				sizeof(option));
			if (option[0] != 0) {
				found = 1;
				if (!strcmp(option, RELOC("off")))
					my_smt_enabled = SMT_OFF;
				else if (!strcmp(option, RELOC("on")))
					my_smt_enabled = SMT_ON;
				else
					my_smt_enabled = SMT_DYNAMIC;
			}
		}
	}

	if (!found )
		my_smt_enabled = SMT_DYNAMIC; /* default to on */

	_naca->smt_state = my_smt_enabled;
}


#ifdef CONFIG_BOOTX_TEXT

/* This function will enable the early boot text when doing OF booting. This
 * way, xmon output should work too
 */
static void __init setup_disp_fake_bi(ihandle dp)
{
	int width = 640, height = 480, depth = 8, pitch;
	unsigned address;
	struct pci_reg_property addrs[8];
	int i, naddrs;
	char name[64];
	unsigned long offset = reloc_offset();
	char *getprop = RELOC("getprop");

	prom_print(RELOC("Initializing fake screen: "));

	memset(name, 0, sizeof(name));
	call_prom(getprop, 4, 1, dp, RELOC("name"), name, sizeof(name));
	name[sizeof(name)-1] = 0;
	prom_print(name);
	prom_print(RELOC("\n"));
	call_prom(getprop, 4, 1, dp, RELOC("width"), &width, sizeof(width));
	call_prom(getprop, 4, 1, dp, RELOC("height"), &height, sizeof(height));
	call_prom(getprop, 4, 1, dp, RELOC("depth"), &depth, sizeof(depth));
	pitch = width * ((depth + 7) / 8);
	call_prom(getprop, 4, 1, dp, RELOC("linebytes"),
		  &pitch, sizeof(pitch));
	if (pitch == 1)
		pitch = 0x1000;		/* for strange IBM display */
	address = 0;

	prom_print(RELOC("width "));
	prom_print_hex(width);
	prom_print(RELOC(" height "));
	prom_print_hex(height);
	prom_print(RELOC(" depth "));
	prom_print_hex(depth);
	prom_print(RELOC(" linebytes "));
	prom_print_hex(pitch);
	prom_print(RELOC("\n"));


	call_prom(getprop, 4, 1, dp, RELOC("address"),
		  &address, sizeof(address));
	if (address == 0) {
		/* look for an assigned address with a size of >= 1MB */
		naddrs = (int) call_prom(getprop, 4, 1, dp,
				RELOC("assigned-addresses"),
				addrs, sizeof(addrs));
		naddrs /= sizeof(struct pci_reg_property);
		for (i = 0; i < naddrs; ++i) {
			if (addrs[i].size_lo >= (1 << 20)) {
				address = addrs[i].addr.a_lo;
				/* use the BE aperture if possible */
				if (addrs[i].size_lo >= (16 << 20))
					address += (8 << 20);
				break;
			}
		}
		if (address == 0) {
			prom_print(RELOC("Failed to get address of frame buffer\n"));
			return;
		}
	}
	btext_setup_display(width, height, depth, pitch, address);
	prom_print(RELOC("Addr of fb: "));
	prom_print_hex(address);
	prom_print_nl();
	RELOC(boot_text_mapped) = 0;
}
#endif /* CONFIG_BOOTX_TEXT */

static void __init prom_init_client_services(unsigned long pp)
{
	unsigned long offset = reloc_offset();
	struct prom_t *_prom = PTRRELOC(&prom);

	/* Get a handle to the prom entry point before anything else */
	_prom->entry = pp;

	/* Init default value for phys size */
	_prom->encode_phys_size = 32;

	/* get a handle for the stdout device */
	_prom->chosen = (ihandle)call_prom(RELOC("finddevice"), 1, 1,
				       RELOC("/chosen"));
	if ((long)_prom->chosen <= 0)
		prom_panic(RELOC("cannot find chosen")); /* msg won't be printed :( */

	/* get device tree root */
	_prom->root = (ihandle)call_prom(RELOC("finddevice"), 1, 1, RELOC("/"));
	if ((long)_prom->root <= 0)
		prom_panic(RELOC("cannot find device tree root")); /* msg won't be printed :( */
}

static void __init prom_init_stdout(void)
{
	unsigned long offset = reloc_offset();
	struct prom_t *_prom = PTRRELOC(&prom);
	u32 val;

        if ((long)call_prom(RELOC("getprop"), 4, 1, _prom->chosen,
			    RELOC("stdout"), &val,
			    sizeof(val)) <= 0)
                prom_panic(RELOC("cannot find stdout"));

        _prom->stdout = (ihandle)(unsigned long)val;
}

static int __init prom_find_machine_type(void)
{
	unsigned long offset = reloc_offset();
	struct prom_t *_prom = PTRRELOC(&prom);
	char compat[256];
	int len, i = 0;

	len = (int)(long)call_prom(RELOC("getprop"), 4, 1, _prom->root,
				   RELOC("compatible"),
				   compat, sizeof(compat)-1);
	if (len > 0) {
		compat[len] = 0;
		while (i < len) {
			char *p = &compat[i];
			int sl = strlen(p);
			if (sl == 0)
				break;
			if (strstr(p, RELOC("Power Macintosh")) ||
			    strstr(p, RELOC("MacRISC4")))
				return PLATFORM_POWERMAC;
			i += sl + 1;
		}
	}
	/* Default to pSeries */
	return PLATFORM_PSERIES;
}

static int __init prom_set_color(ihandle ih, int i, int r, int g, int b)
{
	unsigned long offset = reloc_offset();

	return (int)(long)call_prom(RELOC("call-method"), 6, 1,
		                    RELOC("color!"),
                                    ih,
                                    (void *)(long) i,
                                    (void *)(long) b,
                                    (void *)(long) g,
                                    (void *)(long) r );
}

/*
 * If we have a display that we don't know how to drive,
 * we will want to try to execute OF's open method for it
 * later.  However, OF will probably fall over if we do that
 * we've taken over the MMU.
 * So we check whether we will need to open the display,
 * and if so, open it now.
 */
static unsigned long __init check_display(unsigned long mem)
{
	phandle node;
	ihandle ih;
	int i, j;
	unsigned long offset = reloc_offset();
        struct prom_t *_prom = PTRRELOC(&prom);
	char type[16], *path;
	static unsigned char default_colors[] = {
		0x00, 0x00, 0x00,
		0x00, 0x00, 0xaa,
		0x00, 0xaa, 0x00,
		0x00, 0xaa, 0xaa,
		0xaa, 0x00, 0x00,
		0xaa, 0x00, 0xaa,
		0xaa, 0xaa, 0x00,
		0xaa, 0xaa, 0xaa,
		0x55, 0x55, 0x55,
		0x55, 0x55, 0xff,
		0x55, 0xff, 0x55,
		0x55, 0xff, 0xff,
		0xff, 0x55, 0x55,
		0xff, 0x55, 0xff,
		0xff, 0xff, 0x55,
		0xff, 0xff, 0xff
	};
	const unsigned char *clut;

	_prom->disp_node = 0;

	prom_print(RELOC("Looking for displays\n"));
	if (RELOC(of_stdout_device) != 0) {
		prom_print(RELOC("OF stdout is    : "));
		prom_print(PTRRELOC(RELOC(of_stdout_device)));
		prom_print(RELOC("\n"));
	}
	for (node = 0; prom_next_node(&node); ) {
		type[0] = 0;
		call_prom(RELOC("getprop"), 4, 1, node, RELOC("device_type"),
			  type, sizeof(type));
		if (strcmp(type, RELOC("display")) != 0)
			continue;
		/* It seems OF doesn't null-terminate the path :-( */
		path = (char *) mem;
		memset(path, 0, 256);

		/*
		 * leave some room at the end of the path for appending extra
		 * arguments
		 */
		if ((long) call_prom(RELOC("package-to-path"), 3, 1,
				    node, path, 250) < 0)
			continue;
		prom_print(RELOC("found display   : "));
		prom_print(path);
		prom_print(RELOC("\n"));
		
		/*
		 * If this display is the device that OF is using for stdout,
		 * move it to the front of the list.
		 */
		mem += strlen(path) + 1;
		i = RELOC(prom_num_displays);
		RELOC(prom_num_displays) = i + 1;
		if (RELOC(of_stdout_device) != 0 && i > 0
		    && strcmp(PTRRELOC(RELOC(of_stdout_device)), path) == 0) {
			for (; i > 0; --i) {
				RELOC(prom_display_paths[i])
					= RELOC(prom_display_paths[i-1]);
				RELOC(prom_display_nodes[i])
					= RELOC(prom_display_nodes[i-1]);
			}
			_prom->disp_node = (ihandle)(unsigned long)node;
		}
		RELOC(prom_display_paths[i]) = PTRUNRELOC(path);
		RELOC(prom_display_nodes[i]) = node;
		if (_prom->disp_node == 0)
			_prom->disp_node = (ihandle)(unsigned long)node;
		if (RELOC(prom_num_displays) >= FB_MAX)
			break;
	}
	prom_print(RELOC("Opening displays...\n"));
	for (j = RELOC(prom_num_displays) - 1; j >= 0; j--) {
		path = PTRRELOC(RELOC(prom_display_paths[j]));
		prom_print(RELOC("opening display : "));
		prom_print(path);
		ih = (ihandle)call_prom(RELOC("open"), 1, 1, path);
		if (ih == (ihandle)0 || ih == (ihandle)-1) {
			prom_print(RELOC("... failed\n"));
			continue;
		}

		prom_print(RELOC("... done\n"));

		/* Setup a useable color table when the appropriate
		 * method is available. Should update this to set-colors */
		clut = RELOC(default_colors);
		for (i = 0; i < 32; i++, clut += 3)
			if (prom_set_color(ih, i, clut[0], clut[1],
					   clut[2]) != 0)
				break;

#ifdef CONFIG_LOGO_LINUX_CLUT224
		clut = PTRRELOC(RELOC(logo_linux_clut224.clut));
		for (i = 0; i < RELOC(logo_linux_clut224.clutsize); i++, clut += 3)
			if (prom_set_color(ih, i + 32, clut[0], clut[1],
					   clut[2]) != 0)
				break;
#endif /* CONFIG_LOGO_LINUX_CLUT224 */
	}
	
	return DOUBLEWORD_ALIGN(mem);
}

/* Return (relocated) pointer to this much memory: moves initrd if reqd. */
static void __init *__make_room(unsigned long *mem_start, unsigned long *mem_end,
				unsigned long needed, unsigned long align)
{
	void *ret;
	unsigned long offset = reloc_offset();

	*mem_start = ALIGN(*mem_start, align);
	if (*mem_start + needed > *mem_end) {
#ifdef CONFIG_BLK_DEV_INITRD
		/* FIXME: Apple OF doesn't map unclaimed mem.  If this
		 * ever happened on G5, we'd need to fix. */
		unsigned long initrd_len;

		if (*mem_end != RELOC(initrd_start))
			prom_panic(RELOC("No memory for copy_device_tree"));

		prom_print("Huge device_tree: moving initrd\n");
		/* Move by 4M. */
		initrd_len = RELOC(initrd_end) - RELOC(initrd_start);
		*mem_end = RELOC(initrd_start) + 4 * 1024 * 1024;
		memmove((void *)*mem_end, (void *)RELOC(initrd_start),
			initrd_len);
		RELOC(initrd_start) = *mem_end;
		RELOC(initrd_end) = RELOC(initrd_start) + initrd_len;
#else
		prom_panic(RELOC("No memory for copy_device_tree"));
#endif
	}

	ret = (void *)*mem_start;
	*mem_start += needed;

	return ret;
}

#define make_room(startp, endp, type) \
	__make_room(startp, endp, sizeof(type), __alignof__(type))

static void __init
inspect_node(phandle node, struct device_node *dad,
	     unsigned long *mem_start, unsigned long *mem_end,
	     struct device_node ***allnextpp)
{
	int l;
	phandle child;
	struct device_node *np;
	struct property *pp, **prev_propp;
	char *prev_name, *namep;
	unsigned char *valp;
	unsigned long offset = reloc_offset();

	np = make_room(mem_start, mem_end, struct device_node);
	memset(np, 0, sizeof(*np));

	np->node = node;
	**allnextpp = PTRUNRELOC(np);
	*allnextpp = &np->allnext;
	if (dad != 0) {
		np->parent = PTRUNRELOC(dad);
		/* we temporarily use the `next' field as `last_child'. */
		if (dad->next == 0)
			dad->child = PTRUNRELOC(np);
		else
			dad->next->sibling = PTRUNRELOC(np);
		dad->next = np;
	}

	/* get and store all properties */
	prev_propp = &np->properties;
	prev_name = RELOC("");
	for (;;) {
		/* 32 is max len of name including nul. */
		namep = make_room(mem_start, mem_end, char[32]);
		if ((long) call_prom(RELOC("nextprop"), 3, 1, node, prev_name,
				     namep) <= 0) {
			/* No more nodes: unwind alloc */
			*mem_start = (unsigned long)namep;
			break;
		}
		/* Trim off some if we can */
		*mem_start = DOUBLEWORD_ALIGN((unsigned long)namep
					     + strlen(namep) + 1);
		pp = make_room(mem_start, mem_end, struct property);
		pp->name = PTRUNRELOC(namep);
		prev_name = namep;

		pp->length = call_prom(RELOC("getproplen"), 2, 1, node, namep);
		if (pp->length < 0)
			continue;
		if (pp->length > MAX_PROPERTY_LENGTH) {
			char path[128];

			prom_print(RELOC("WARNING: ignoring large property "));
			/* It seems OF doesn't null-terminate the path :-( */
			memset(path, 0, sizeof(path));
			if (call_prom(RELOC("package-to-path"), 3, 1, node,
                            path, sizeof(path)-1) > 0)
				prom_print(path);
			prom_print(namep);
			prom_print(RELOC(" length 0x"));
			prom_print_hex(pp->length);
			prom_print_nl();

			continue;
		}
		valp = __make_room(mem_start, mem_end, pp->length, 1);
		pp->value = PTRUNRELOC(valp);
		call_prom(RELOC("getprop"), 4, 1, node, namep,valp,pp->length);
		*prev_propp = PTRUNRELOC(pp);
		prev_propp = &pp->next;
	}

	/* Add a "linux_phandle" value */
        if (np->node) {
		u32 ibm_phandle = 0;
		int len;

                /* First see if "ibm,phandle" exists and use its value */
                len = (int)
                        call_prom(RELOC("getprop"), 4, 1, node, RELOC("ibm,phandle"),
                                  &ibm_phandle, sizeof(ibm_phandle));
                if (len < 0) {
                        np->linux_phandle = np->node;
                } else {
                        np->linux_phandle = ibm_phandle;
		}
	}

	*prev_propp = 0;

	/* get the node's full name */
	namep = (char *)*mem_start;
	l = (long) call_prom(RELOC("package-to-path"), 3, 1, node,
			     namep, *mem_end - *mem_start);
	if (l >= 0) {
		/* Didn't fit?  Get more room. */
		if (l+1 > *mem_end - *mem_start) {
			namep = __make_room(mem_start, mem_end, l+1, 1);
			call_prom(RELOC("package-to-path"),3,1,node,namep,l);
		}
		np->full_name = PTRUNRELOC(namep);
		namep[l] = '\0';
		*mem_start = DOUBLEWORD_ALIGN(*mem_start + l + 1);
	}

	/* do all our children */
	child = call_prom(RELOC("child"), 1, 1, node);
	while (child != (phandle)0) {
		inspect_node(child, np, mem_start, mem_end,
					 allnextpp);
		child = call_prom(RELOC("peer"), 1, 1, child);
	}
}

/*
 * Make a copy of the device tree from the PROM.
 */
static unsigned long __init
copy_device_tree(unsigned long mem_start)
{
	phandle root;
	struct device_node **allnextp;
	unsigned long offset = reloc_offset();
	unsigned long mem_end;

	/* We pass mem_end-mem_start to OF: keep it well under 32-bit */
	mem_end = mem_start + 1024*1024*1024;
#ifdef CONFIG_BLK_DEV_INITRD
	if (RELOC(initrd_start) && RELOC(initrd_start) > mem_start)
		mem_end = RELOC(initrd_start);
#endif /* CONFIG_BLK_DEV_INITRD */

	root = call_prom(RELOC("peer"), 1, 1, (phandle)0);
	if (root == (phandle)0) {
		prom_panic(RELOC("couldn't get device tree root\n"));
	}
	allnextp = &RELOC(allnodes);
	inspect_node(root, 0, &mem_start, &mem_end, &allnextp);
	*allnextp = 0;
	return mem_start;
}

/* Verify bi_recs are good */
static struct bi_record * __init prom_bi_rec_verify(struct bi_record *bi_recs)
{
	struct bi_record *first, *last;
#ifdef DEBUG_PROM
	unsigned long offset = reloc_offset();

  	prom_print(RELOC("birec_verify: r6=0x"));
  	prom_print_hex((unsigned long)bi_recs);
  	prom_print_nl();
	if (bi_recs != NULL) {
		prom_print(RELOC("  tag=0x"));
		prom_print_hex(bi_recs->tag);
		prom_print_nl();
	}
#endif /* DEBUG_PROM */

	if ( bi_recs == NULL || bi_recs->tag != BI_FIRST )
		return NULL;

	last = (struct bi_record *)(long)bi_recs->data[0];

#ifdef DEBUG_PROM
  	prom_print(RELOC("  last=0x"));
  	prom_print_hex((unsigned long)last);
  	prom_print_nl();
	if (last != NULL) {
		prom_print(RELOC("  last_tag=0x"));
		prom_print_hex(last->tag);
		prom_print_nl();
	}
#endif /* DEBUG_PROM */

	if ( last == NULL || last->tag != BI_LAST )
		return NULL;

	first = (struct bi_record *)(long)last->data[0];
#ifdef DEBUG_PROM
  	prom_print(RELOC("  first=0x"));
  	prom_print_hex((unsigned long)first);
  	prom_print_nl();
#endif /* DEBUG_PROM */

	if ( first == NULL || first != bi_recs )
		return NULL;

	return bi_recs;
}

static void __init prom_bi_rec_reserve(void)
{
	unsigned long offset = reloc_offset();
	struct prom_t *_prom = PTRRELOC(&prom);
	struct bi_record *rec;

	if ( _prom->bi_recs != NULL) {

		for ( rec=_prom->bi_recs;
		      rec->tag != BI_LAST;
		      rec=bi_rec_next(rec) ) {
#ifdef DEBUG_PROM
			prom_print(RELOC("bi: 0x"));
			prom_print_hex(rec->tag);
			prom_print_nl();
#endif /* DEBUG_PROM */
			switch (rec->tag) {
#ifdef CONFIG_BLK_DEV_INITRD
			case BI_INITRD:
				RELOC(initrd_start) = (unsigned long)(rec->data[0]);
				RELOC(initrd_end) = RELOC(initrd_start) + rec->data[1];
				break;
#endif /* CONFIG_BLK_DEV_INITRD */
			}
		}
		/* The next use of this field will be after relocation
	 	 * is enabled, so convert this physical address into a
	 	 * virtual address.
	 	 */
		_prom->bi_recs = PTRUNRELOC(_prom->bi_recs);
	}
}

/*
 * We enter here early on, when the Open Firmware prom is still
 * handling exceptions and the MMU hash table for us.
 */

unsigned long __init
prom_init(unsigned long r3, unsigned long r4, unsigned long pp,
	  unsigned long r6, unsigned long r7)
{
	unsigned long mem;
	ihandle prom_cpu;
	phandle cpu_pkg;
	unsigned long offset = reloc_offset();
	long l;
	char *p, *d;
	unsigned long phys;
	u32 getprop_rval;
	struct systemcfg *_systemcfg;
	struct paca_struct *_xPaca = PTRRELOC(&paca[0]);
	struct prom_t *_prom = PTRRELOC(&prom);

	/* First zero the BSS -- use memset, some arches don't have
	 * caches on yet */
	memset(PTRRELOC(&__bss_start), 0, __bss_stop - __bss_start);

	/* Setup systemcfg and NACA pointers now */
	RELOC(systemcfg) = _systemcfg = (struct systemcfg *)(SYSTEMCFG_VIRT_ADDR - offset);
	RELOC(naca) = (struct naca_struct *)(NACA_VIRT_ADDR - offset);

	/* Init interface to Open Firmware and pickup bi-recs */
	prom_init_client_services(pp);

	/* Init prom stdout device */
	prom_init_stdout();

#ifdef DEBUG_PROM
  	prom_print(RELOC("klimit=0x"));
  	prom_print_hex(RELOC(klimit));
  	prom_print_nl();
  	prom_print(RELOC("offset=0x"));
  	prom_print_hex(offset);
  	prom_print_nl();
  	prom_print(RELOC("->mem=0x"));
  	prom_print_hex(RELOC(klimit) - offset);
  	prom_print_nl();
#endif /* DEBUG_PROM */

	/* check out if we have bi_recs */
	_prom->bi_recs = prom_bi_rec_verify((struct bi_record *)r6);
	if ( _prom->bi_recs != NULL ) {
		RELOC(klimit) = PTRUNRELOC((unsigned long)_prom->bi_recs +
					   _prom->bi_recs->data[1]);
#ifdef DEBUG_PROM
		prom_print(RELOC("bi_recs=0x"));
		prom_print_hex((unsigned long)_prom->bi_recs);
		prom_print_nl();
		prom_print(RELOC("new mem=0x"));
		prom_print_hex(RELOC(klimit) - offset);
		prom_print_nl();
#endif /* DEBUG_PROM */
	}

	/* If we don't have birec's or didn't find them, check for an initrd
	 * using the "yaboot" way
	 */
#ifdef CONFIG_BLK_DEV_INITRD
	if ( _prom->bi_recs == NULL && r3 && r4 && r4 != 0xdeadbeef) {
		RELOC(initrd_start) = (r3 >= KERNELBASE) ? __pa(r3) : r3;
		RELOC(initrd_end) = RELOC(initrd_start) + r4;
		RELOC(initrd_below_start_ok) = 1;
	}
#endif /* CONFIG_BLK_DEV_INITRD */

	/* Default machine type. */
	_systemcfg->platform = prom_find_machine_type();

	/* On pSeries, copy the CPU hold code */
	if (_systemcfg->platform == PLATFORM_PSERIES)
		copy_and_flush(0, KERNELBASE - offset, 0x100, 0);

	/* Start storing things at klimit */
      	mem = RELOC(klimit) - offset;

	/* Get the full OF pathname of the stdout device */
	p = (char *) mem;
	memset(p, 0, 256);
	call_prom(RELOC("instance-to-path"), 3, 1, _prom->stdout, p, 255);
	RELOC(of_stdout_device) = PTRUNRELOC(p);
	mem += strlen(p) + 1;

	getprop_rval = 1;
	call_prom(RELOC("getprop"), 4, 1,
		  _prom->root, RELOC("#size-cells"),
		  &getprop_rval, sizeof(getprop_rval));
	_prom->encode_phys_size = (getprop_rval == 1) ? 32 : 64;

	/* Determine which cpu is actually running right _now_ */
        if ((long)call_prom(RELOC("getprop"), 4, 1, _prom->chosen,
			    RELOC("cpu"), &getprop_rval,
			    sizeof(getprop_rval)) <= 0)
                prom_panic(RELOC("cannot find boot cpu"));

	prom_cpu = (ihandle)(unsigned long)getprop_rval;
	cpu_pkg = call_prom(RELOC("instance-to-package"), 1, 1, prom_cpu);
	call_prom(RELOC("getprop"), 4, 1,
		cpu_pkg, RELOC("reg"),
		&getprop_rval, sizeof(getprop_rval));
	_prom->cpu = (int)(unsigned long)getprop_rval;
	_xPaca[0].xHwProcNum = _prom->cpu;

	RELOC(boot_cpuid) = 0;

#ifdef DEBUG_PROM
  	prom_print(RELOC("Booting CPU hw index = 0x"));
  	prom_print_hex(_prom->cpu);
  	prom_print_nl();
#endif

	/* Get the boot device and translate it to a full OF pathname. */
	p = (char *) mem;
	l = (long) call_prom(RELOC("getprop"), 4, 1, _prom->chosen,
			    RELOC("bootpath"), p, 1<<20);
	if (l > 0) {
		p[l] = 0;	/* should already be null-terminated */
		RELOC(bootpath) = PTRUNRELOC(p);
		mem += l + 1;
		d = (char *) mem;
		*d = 0;
		call_prom(RELOC("canon"), 3, 1, p, d, 1<<20);
		RELOC(bootdevice) = PTRUNRELOC(d);
		mem = DOUBLEWORD_ALIGN(mem + strlen(d) + 1);
	}

	RELOC(cmd_line[0]) = 0;
	if ((long)_prom->chosen > 0) {
		call_prom(RELOC("getprop"), 4, 1, _prom->chosen,
			  RELOC("bootargs"), p, sizeof(cmd_line));
		if (p != NULL && p[0] != 0)
			strlcpy(RELOC(cmd_line), p, sizeof(cmd_line));
	}

	early_cmdline_parse();

	prom_initialize_lmb();

	prom_bi_rec_reserve();

	mem = check_display(mem);

	if (_systemcfg->platform != PLATFORM_POWERMAC)
		prom_instantiate_rtas();

        /* Initialize some system info into the Naca early... */
        prom_initialize_naca();

	smt_setup();

        /* If we are on an SMP machine, then we *MUST* do the
         * following, regardless of whether we have an SMP
         * kernel or not.
         */
	prom_hold_cpus(mem);

#ifdef DEBUG_PROM
  	prom_print(RELOC("after basic inits, mem=0x"));
  	prom_print_hex(mem);
  	prom_print_nl();
#ifdef CONFIG_BLK_DEV_INITRD
	prom_print(RELOC("initrd_start=0x"));
	prom_print_hex(RELOC(initrd_start));
	prom_print_nl();
	prom_print(RELOC("initrd_end=0x"));
	prom_print_hex(RELOC(initrd_end));
	prom_print_nl();
#endif /* CONFIG_BLK_DEV_INITRD */
	prom_print(RELOC("copying OF device tree...\n"));
#endif /* DEBUG_PROM */
	mem = copy_device_tree(mem);

	RELOC(klimit) = mem + offset;

#ifdef DEBUG_PROM
	prom_print(RELOC("new klimit is\n"));
  	prom_print(RELOC("klimit=0x"));
  	prom_print_hex(RELOC(klimit));
	prom_print(RELOC(" ->mem=0x\n"));
  	prom_print(RELOC("klimit=0x"));
  	prom_print_hex(mem);
  	prom_print_nl();
#endif /* DEBUG_PROM */

	lmb_reserve(0, __pa(RELOC(klimit)));

#ifdef CONFIG_BLK_DEV_INITRD
	if (RELOC(initrd_start)) {
		unsigned long initrd_len;
		initrd_len = RELOC(initrd_end) - RELOC(initrd_start);

		/* Move initrd if it's where we're going to copy kernel. */
		if (RELOC(initrd_start) < __pa(RELOC(klimit))) {
			memmove((void *)mem, (void *)RELOC(initrd_start),
				initrd_len);
			RELOC(initrd_start) = mem;
			RELOC(initrd_end) = mem + initrd_len;
		}

		lmb_reserve(RELOC(initrd_start), initrd_len);
	}
#endif /* CONFIG_BLK_DEV_INITRD */

	if (_systemcfg->platform == PLATFORM_PSERIES)
		prom_initialize_tce_table();

#ifdef CONFIG_PMAC_DART
	if (_systemcfg->platform == PLATFORM_POWERMAC)
		prom_initialize_dart_table();
#endif

#ifdef CONFIG_BOOTX_TEXT
	if(_prom->disp_node) {
		prom_print(RELOC("Setting up bi display...\n"));
		setup_disp_fake_bi(_prom->disp_node);
	}
#endif /* CONFIG_BOOTX_TEXT */

	prom_print(RELOC("Calling quiesce ...\n"));
	call_prom(RELOC("quiesce"), 0, 0);
	phys = KERNELBASE - offset;

#ifdef CONFIG_BLK_DEV_INITRD
	/* If we had an initrd, we convert its address to virtual */
	if (RELOC(initrd_start)) {
		RELOC(initrd_start) = (unsigned long)__va(RELOC(initrd_start));
		RELOC(initrd_end) = (unsigned long)__va(RELOC(initrd_end));
	}
#endif /* CONFIG_BLK_DEV_INITRD */

	prom_print(RELOC("returning from prom_init\n"));
	return phys;
}

/*
 * Find the device_node with a given phandle.
 */
static struct device_node * __devinit
find_phandle(phandle ph)
{
	struct device_node *np;

	for (np = allnodes; np != 0; np = np->allnext)
		if (np->linux_phandle == ph)
			return np;
	return NULL;
}

/*
 * Find the interrupt parent of a node.
 */
static struct device_node * __devinit
intr_parent(struct device_node *p)
{
	phandle *parp;

	parp = (phandle *) get_property(p, "interrupt-parent", NULL);
	if (parp == NULL)
		return p->parent;
	return find_phandle(*parp);
}

/*
 * Find out the size of each entry of the interrupts property
 * for a node.
 */
static int __devinit
prom_n_intr_cells(struct device_node *np)
{
	struct device_node *p;
	unsigned int *icp;

	for (p = np; (p = intr_parent(p)) != NULL; ) {
		icp = (unsigned int *)
			get_property(p, "#interrupt-cells", NULL);
		if (icp != NULL)
			return *icp;
		if (get_property(p, "interrupt-controller", NULL) != NULL
		    || get_property(p, "interrupt-map", NULL) != NULL) {
			printk("oops, node %s doesn't have #interrupt-cells\n",
			       p->full_name);
		return 1;
		}
	}
#ifdef DEBUG_IRQ
	printk("prom_n_intr_cells failed for %s\n", np->full_name);
#endif
	return 1;
}

/*
 * Map an interrupt from a device up to the platform interrupt
 * descriptor.
 */
static int __devinit
map_interrupt(unsigned int **irq, struct device_node **ictrler,
	      struct device_node *np, unsigned int *ints, int nintrc)
{
	struct device_node *p, *ipar;
	unsigned int *imap, *imask, *ip;
	int i, imaplen, match;
	int newintrc, newaddrc;
	unsigned int *reg;
	int naddrc;

	reg = (unsigned int *) get_property(np, "reg", NULL);
	naddrc = prom_n_addr_cells(np);
	p = intr_parent(np);
	while (p != NULL) {
		if (get_property(p, "interrupt-controller", NULL) != NULL)
			/* this node is an interrupt controller, stop here */
			break;
		imap = (unsigned int *)
			get_property(p, "interrupt-map", &imaplen);
		if (imap == NULL) {
			p = intr_parent(p);
			continue;
		}
		imask = (unsigned int *)
			get_property(p, "interrupt-map-mask", NULL);
		if (imask == NULL) {
			printk("oops, %s has interrupt-map but no mask\n",
			       p->full_name);
			return 0;
		}
		imaplen /= sizeof(unsigned int);
		match = 0;
		ipar = NULL;
		while (imaplen > 0 && !match) {
			/* check the child-interrupt field */
			match = 1;
			for (i = 0; i < naddrc && match; ++i)
				match = ((reg[i] ^ imap[i]) & imask[i]) == 0;
			for (; i < naddrc + nintrc && match; ++i)
				match = ((ints[i-naddrc] ^ imap[i]) & imask[i]) == 0;
			imap += naddrc + nintrc;
			imaplen -= naddrc + nintrc;
			/* grab the interrupt parent */
			ipar = find_phandle((phandle) *imap++);
			--imaplen;
			if (ipar == NULL) {
				printk("oops, no int parent %x in map of %s\n",
				       imap[-1], p->full_name);
				return 0;
			}
			/* find the parent's # addr and intr cells */
			ip = (unsigned int *)
				get_property(ipar, "#interrupt-cells", NULL);
			if (ip == NULL) {
				printk("oops, no #interrupt-cells on %s\n",
				       ipar->full_name);
				return 0;
			}
			newintrc = *ip;
			ip = (unsigned int *)
				get_property(ipar, "#address-cells", NULL);
			newaddrc = (ip == NULL)? 0: *ip;
			imap += newaddrc + newintrc;
			imaplen -= newaddrc + newintrc;
		}
		if (imaplen < 0) {
			printk("oops, error decoding int-map on %s, len=%d\n",
			       p->full_name, imaplen);
			return 0;
		}
		if (!match) {
#ifdef DEBUG_IRQ
			printk("oops, no match in %s int-map for %s\n",
			       p->full_name, np->full_name);
#endif
			return 0;
		}
		p = ipar;
		naddrc = newaddrc;
		nintrc = newintrc;
		ints = imap - nintrc;
		reg = ints - naddrc;
	}
#ifdef DEBUG_IRQ
	if (p == NULL)
		printk("hmmm, int tree for %s doesn't have ctrler\n",
		       np->full_name);
#endif
	*irq = ints;
	*ictrler = p;
	return nintrc;
}

static unsigned long __init
finish_node_interrupts(struct device_node *np, unsigned long mem_start,
		       int measure_only)
{
	unsigned int *ints;
	int intlen, intrcells;
	int i, j, n;
	unsigned int *irq, virq;
	struct device_node *ic;

	ints = (unsigned int *) get_property(np, "interrupts", &intlen);
	if (ints == NULL)
		return mem_start;
	intrcells = prom_n_intr_cells(np);
	intlen /= intrcells * sizeof(unsigned int);
	np->n_intrs = intlen;
	np->intrs = (struct interrupt_info *) mem_start;
	mem_start += intlen * sizeof(struct interrupt_info);

	if (measure_only)
		return mem_start;

	for (i = 0; i < intlen; ++i) {
		np->intrs[i].line = 0;
		np->intrs[i].sense = 1;
		n = map_interrupt(&irq, &ic, np, ints, intrcells);
		if (n <= 0)
			continue;
		virq = virt_irq_create_mapping(irq[0]);
		if (virq == NO_IRQ) {
			printk(KERN_CRIT "Could not allocate interrupt "
			       "number for %s\n", np->full_name);
		} else
			np->intrs[i].line = irq_offset_up(virq);

		/* We offset irq numbers for the u3 MPIC by 128 in PowerMac */
		if (systemcfg->platform == PLATFORM_POWERMAC && ic && ic->parent) {
			char *name = get_property(ic->parent, "name", NULL);
			if (name && !strcmp(name, "u3"))
				np->intrs[i].line += 128;
		}
		if (n > 1)
			np->intrs[i].sense = irq[1];
		if (n > 2) {
			printk("hmmm, got %d intr cells for %s:", n,
			       np->full_name);
			for (j = 0; j < n; ++j)
				printk(" %d", irq[j]);
			printk("\n");
		}
		ints += intrcells;
	}

	return mem_start;
}

static unsigned long __init
interpret_pci_props(struct device_node *np, unsigned long mem_start,
		    int naddrc, int nsizec, int measure_only)
{
	struct address_range *adr;
	struct pci_reg_property *pci_addrs;
	int i, l;

	pci_addrs = (struct pci_reg_property *)
		get_property(np, "assigned-addresses", &l);
	if (pci_addrs != 0 && l >= sizeof(struct pci_reg_property)) {
		i = 0;
		adr = (struct address_range *) mem_start;
		while ((l -= sizeof(struct pci_reg_property)) >= 0) {
 			if (!measure_only) {
				adr[i].space = pci_addrs[i].addr.a_hi;
				adr[i].address = pci_addrs[i].addr.a_lo;
				adr[i].size = pci_addrs[i].size_lo;
			}
			++i;
		}
		np->addrs = adr;
		np->n_addrs = i;
		mem_start += i * sizeof(struct address_range);
	}
	return mem_start;
}

static unsigned long __init
interpret_dbdma_props(struct device_node *np, unsigned long mem_start,
		      int naddrc, int nsizec, int measure_only)
{
	struct reg_property32 *rp;
	struct address_range *adr;
	unsigned long base_address;
	int i, l;
	struct device_node *db;

	base_address = 0;
	if (!measure_only) {
		for (db = np->parent; db != NULL; db = db->parent) {
			if (!strcmp(db->type, "dbdma") && db->n_addrs != 0) {
				base_address = db->addrs[0].address;
				break;
			}
		}
	}

	rp = (struct reg_property32 *) get_property(np, "reg", &l);
	if (rp != 0 && l >= sizeof(struct reg_property32)) {
		i = 0;
		adr = (struct address_range *) mem_start;
		while ((l -= sizeof(struct reg_property32)) >= 0) {
 			if (!measure_only) {
				adr[i].space = 2;
				adr[i].address = rp[i].address + base_address;
				adr[i].size = rp[i].size;
			}
			++i;
		}
		np->addrs = adr;
		np->n_addrs = i;
		mem_start += i * sizeof(struct address_range);
	}

	return mem_start;
}

static unsigned long __init
interpret_macio_props(struct device_node *np, unsigned long mem_start,
		      int naddrc, int nsizec, int measure_only)
{
	struct reg_property32 *rp;
	struct address_range *adr;
	unsigned long base_address;
	int i, l;
	struct device_node *db;

	base_address = 0;
	if (!measure_only) {
		for (db = np->parent; db != NULL; db = db->parent) {
			if (!strcmp(db->type, "mac-io") && db->n_addrs != 0) {
				base_address = db->addrs[0].address;
				break;
			}
		}
	}

	rp = (struct reg_property32 *) get_property(np, "reg", &l);
	if (rp != 0 && l >= sizeof(struct reg_property32)) {
		i = 0;
		adr = (struct address_range *) mem_start;
		while ((l -= sizeof(struct reg_property32)) >= 0) {
 			if (!measure_only) {
				adr[i].space = 2;
				adr[i].address = rp[i].address + base_address;
				adr[i].size = rp[i].size;
			}
			++i;
		}
		np->addrs = adr;
		np->n_addrs = i;
		mem_start += i * sizeof(struct address_range);
	}

	return mem_start;
}

static unsigned long __init
interpret_isa_props(struct device_node *np, unsigned long mem_start,
		    int naddrc, int nsizec, int measure_only)
{
	struct isa_reg_property *rp;
	struct address_range *adr;
	int i, l;

	rp = (struct isa_reg_property *) get_property(np, "reg", &l);
	if (rp != 0 && l >= sizeof(struct isa_reg_property)) {
		i = 0;
		adr = (struct address_range *) mem_start;
		while ((l -= sizeof(struct reg_property)) >= 0) {
 			if (!measure_only) {
				adr[i].space = rp[i].space;
				adr[i].address = rp[i].address;
				adr[i].size = rp[i].size;
			}
			++i;
		}
		np->addrs = adr;
		np->n_addrs = i;
		mem_start += i * sizeof(struct address_range);
	}

	return mem_start;
}

static unsigned long __init
interpret_root_props(struct device_node *np, unsigned long mem_start,
		     int naddrc, int nsizec, int measure_only)
{
	struct address_range *adr;
	int i, l;
	unsigned int *rp;
	int rpsize = (naddrc + nsizec) * sizeof(unsigned int);

	rp = (unsigned int *) get_property(np, "reg", &l);
	if (rp != 0 && l >= rpsize) {
		i = 0;
		adr = (struct address_range *) mem_start;
		while ((l -= rpsize) >= 0) {
 			if (!measure_only) {
				adr[i].space = 0;
				adr[i].address = rp[naddrc - 1];
				adr[i].size = rp[naddrc + nsizec - 1];
			}
			++i;
			rp += naddrc + nsizec;
		}
		np->addrs = adr;
		np->n_addrs = i;
		mem_start += i * sizeof(struct address_range);
	}

	return mem_start;
}

static unsigned long __init
finish_node(struct device_node *np, unsigned long mem_start,
	    interpret_func *ifunc, int naddrc, int nsizec, int measure_only)
{
	struct device_node *child;
	int *ip;

	np->name = get_property(np, "name", 0);
	np->type = get_property(np, "device_type", 0);

	if (!np->name)
		np->name = "<NULL>";
	if (!np->type)
		np->type = "<NULL>";

	/* get the device addresses and interrupts */
	if (ifunc != NULL)
		mem_start = ifunc(np, mem_start, naddrc, nsizec, measure_only);

	mem_start = finish_node_interrupts(np, mem_start, measure_only);

	/* Look for #address-cells and #size-cells properties. */
	ip = (int *) get_property(np, "#address-cells", 0);
	if (ip != NULL)
		naddrc = *ip;
	ip = (int *) get_property(np, "#size-cells", 0);
	if (ip != NULL)
		nsizec = *ip;

	/* the f50 sets the name to 'display' and 'compatible' to what we
	 * expect for the name -- Cort
	 */
	if (!strcmp(np->name, "display"))
		np->name = get_property(np, "compatible", 0);

	if (!strcmp(np->name, "device-tree") || np->parent == NULL)
		ifunc = interpret_root_props;
	else if (np->type == 0)
		ifunc = NULL;
	else if (!strcmp(np->type, "pci") || !strcmp(np->type, "vci"))
		ifunc = interpret_pci_props;
	else if (!strcmp(np->type, "dbdma"))
		ifunc = interpret_dbdma_props;
	else if (!strcmp(np->type, "mac-io") || ifunc == interpret_macio_props)
		ifunc = interpret_macio_props;
	else if (!strcmp(np->type, "isa"))
		ifunc = interpret_isa_props;
	else if (!strcmp(np->name, "uni-n") || !strcmp(np->name, "u3"))
		ifunc = interpret_root_props;
	else if (!((ifunc == interpret_dbdma_props
		    || ifunc == interpret_macio_props)
		   && (!strcmp(np->type, "escc")
		       || !strcmp(np->type, "media-bay"))))
		ifunc = NULL;

	for (child = np->child; child != NULL; child = child->sibling)
		mem_start = finish_node(child, mem_start, ifunc,
					naddrc, nsizec, measure_only);

	return mem_start;
}

/*
 * finish_device_tree is called once things are running normally
 * (i.e. with text and data mapped to the address they were linked at).
 * It traverses the device tree and fills in the name, type,
 * {n_}addrs and {n_}intrs fields of each node.
 */
void __init
finish_device_tree(void)
{
	unsigned long mem = klimit;

	virt_irq_init();

	dev_tree_size = finish_node(allnodes, 0, NULL, 0, 0, 1);
	mem = (long)abs_to_virt(lmb_alloc(dev_tree_size,
					  __alignof__(struct device_node)));
	if (finish_node(allnodes, mem, NULL, 0, 0, 0) != mem + dev_tree_size)
		BUG();
	rtas.dev = of_find_node_by_name(NULL, "rtas");
}

int
prom_n_addr_cells(struct device_node* np)
{
	int* ip;
	do {
		if (np->parent)
			np = np->parent;
		ip = (int *) get_property(np, "#address-cells", 0);
		if (ip != NULL)
			return *ip;
	} while (np->parent);
	/* No #address-cells property for the root node, default to 1 */
	return 1;
}

int
prom_n_size_cells(struct device_node* np)
{
	int* ip;
	do {
		if (np->parent)
			np = np->parent;
		ip = (int *) get_property(np, "#size-cells", 0);
		if (ip != NULL)
			return *ip;
	} while (np->parent);
	/* No #size-cells property for the root node, default to 1 */
	return 1;
}

/*
 * Work out the sense (active-low level / active-high edge)
 * of each interrupt from the device tree.
 */
void __init
prom_get_irq_senses(unsigned char *senses, int off, int max)
{
	struct device_node *np;
	int i, j;

	/* default to level-triggered */
	memset(senses, 1, max - off);

	for (np = allnodes; np != 0; np = np->allnext) {
		for (j = 0; j < np->n_intrs; j++) {
			i = np->intrs[j].line;
			if (i >= off && i < max)
				senses[i-off] = np->intrs[j].sense;
		}
	}
}

/*
 * Construct and return a list of the device_nodes with a given name.
 */
struct device_node *
find_devices(const char *name)
{
	struct device_node *head, **prevp, *np;

	prevp = &head;
	for (np = allnodes; np != 0; np = np->allnext) {
		if (np->name != 0 && strcasecmp(np->name, name) == 0) {
			*prevp = np;
			prevp = &np->next;
		}
	}
	*prevp = 0;
	return head;
}

/*
 * Construct and return a list of the device_nodes with a given type.
 */
struct device_node *
find_type_devices(const char *type)
{
	struct device_node *head, **prevp, *np;

	prevp = &head;
	for (np = allnodes; np != 0; np = np->allnext) {
		if (np->type != 0 && strcasecmp(np->type, type) == 0) {
			*prevp = np;
			prevp = &np->next;
		}
	}
	*prevp = 0;
	return head;
}

/*
 * Returns all nodes linked together
 */
struct device_node *
find_all_nodes(void)
{
	struct device_node *head, **prevp, *np;

	prevp = &head;
	for (np = allnodes; np != 0; np = np->allnext) {
		*prevp = np;
		prevp = &np->next;
	}
	*prevp = 0;
	return head;
}

/* Checks if the given "compat" string matches one of the strings in
 * the device's "compatible" property
 */
int
device_is_compatible(struct device_node *device, const char *compat)
{
	const char* cp;
	int cplen, l;

	cp = (char *) get_property(device, "compatible", &cplen);
	if (cp == NULL)
		return 0;
	while (cplen > 0) {
		if (strncasecmp(cp, compat, strlen(compat)) == 0)
			return 1;
		l = strlen(cp) + 1;
		cp += l;
		cplen -= l;
	}

	return 0;
}


/*
 * Indicates whether the root node has a given value in its
 * compatible property.
 */
int
machine_is_compatible(const char *compat)
{
	struct device_node *root;
	int rc = 0;
  
	root = of_find_node_by_path("/");
	if (root) {
		rc = device_is_compatible(root, compat);
		of_node_put(root);
	}
	return rc;
}

/*
 * Construct and return a list of the device_nodes with a given type
 * and compatible property.
 */
struct device_node *
find_compatible_devices(const char *type, const char *compat)
{
	struct device_node *head, **prevp, *np;

	prevp = &head;
	for (np = allnodes; np != 0; np = np->allnext) {
		if (type != NULL
		    && !(np->type != 0 && strcasecmp(np->type, type) == 0))
			continue;
		if (device_is_compatible(np, compat)) {
			*prevp = np;
			prevp = &np->next;
		}
	}
	*prevp = 0;
	return head;
}

/*
 * Find the device_node with a given full_name.
 */
struct device_node *
find_path_device(const char *path)
{
	struct device_node *np;

	for (np = allnodes; np != 0; np = np->allnext)
		if (np->full_name != 0 && strcasecmp(np->full_name, path) == 0)
			return np;
	return NULL;
}

/*******
 *
 * New implementation of the OF "find" APIs, return a refcounted
 * object, call of_node_put() when done.  The device tree and list
 * are protected by a rw_lock.
 *
 * Note that property management will need some locking as well,
 * this isn't dealt with yet.
 *
 *******/

/**
 *	of_find_node_by_name - Find a node by its "name" property
 *	@from:	The node to start searching from or NULL, the node
 *		you pass will not be searched, only the next one
 *		will; typically, you pass what the previous call
 *		returned. of_node_put() will be called on it
 *	@name:	The name string to match against
 *
 *	Returns a node pointer with refcount incremented, use
 *	of_node_put() on it when done.
 */
struct device_node *of_find_node_by_name(struct device_node *from,
	const char *name)
{
	struct device_node *np;

	read_lock(&devtree_lock);
	np = from ? from->allnext : allnodes;
	for (; np != 0; np = np->allnext)
		if (np->name != 0 && strcasecmp(np->name, name) == 0
		    && of_node_get(np))
			break;
	if (from)
		of_node_put(from);
	read_unlock(&devtree_lock);
	return np;
}
EXPORT_SYMBOL(of_find_node_by_name);

/**
 *	of_find_node_by_type - Find a node by its "device_type" property
 *	@from:	The node to start searching from or NULL, the node
 *		you pass will not be searched, only the next one
 *		will; typically, you pass what the previous call
 *		returned. of_node_put() will be called on it
 *	@name:	The type string to match against
 *
 *	Returns a node pointer with refcount incremented, use
 *	of_node_put() on it when done.
 */
struct device_node *of_find_node_by_type(struct device_node *from,
	const char *type)
{
	struct device_node *np;

	read_lock(&devtree_lock);
	np = from ? from->allnext : allnodes;
	for (; np != 0; np = np->allnext)
		if (np->type != 0 && strcasecmp(np->type, type) == 0
		    && of_node_get(np))
			break;
	if (from)
		of_node_put(from);
	read_unlock(&devtree_lock);
	return np;
}
EXPORT_SYMBOL(of_find_node_by_type);

/**
 *	of_find_compatible_node - Find a node based on type and one of the
 *                                tokens in its "compatible" property
 *	@from:		The node to start searching from or NULL, the node
 *			you pass will not be searched, only the next one
 *			will; typically, you pass what the previous call
 *			returned. of_node_put() will be called on it
 *	@type:		The type string to match "device_type" or NULL to ignore
 *	@compatible:	The string to match to one of the tokens in the device
 *			"compatible" list.
 *
 *	Returns a node pointer with refcount incremented, use
 *	of_node_put() on it when done.
 */
struct device_node *of_find_compatible_node(struct device_node *from,
	const char *type, const char *compatible)
{
	struct device_node *np;

	read_lock(&devtree_lock);
	np = from ? from->allnext : allnodes;
	for (; np != 0; np = np->allnext) {
		if (type != NULL
		    && !(np->type != 0 && strcasecmp(np->type, type) == 0))
			continue;
		if (device_is_compatible(np, compatible) && of_node_get(np))
			break;
	}
	if (from)
		of_node_put(from);
	read_unlock(&devtree_lock);
	return np;
}
EXPORT_SYMBOL(of_find_compatible_node);

/**
 *	of_find_node_by_path - Find a node matching a full OF path
 *	@path:	The full path to match
 *
 *	Returns a node pointer with refcount incremented, use
 *	of_node_put() on it when done.
 */
struct device_node *of_find_node_by_path(const char *path)
{
	struct device_node *np = allnodes;

	read_lock(&devtree_lock);
	for (; np != 0; np = np->allnext)
		if (np->full_name != 0 && strcasecmp(np->full_name, path) == 0
		    && of_node_get(np))
			break;
	read_unlock(&devtree_lock);
	return np;
}
EXPORT_SYMBOL(of_find_node_by_path);

/**
 *	of_find_all_nodes - Get next node in global list
 *	@prev:	Previous node or NULL to start iteration
 *		of_node_put() will be called on it
 *
 *	Returns a node pointer with refcount incremented, use
 *	of_node_put() on it when done.
 */
struct device_node *of_find_all_nodes(struct device_node *prev)
{
	struct device_node *np;

	read_lock(&devtree_lock);
	np = prev ? prev->allnext : allnodes;
	for (; np != 0; np = np->allnext)
		if (of_node_get(np))
			break;
	if (prev)
		of_node_put(prev);
	read_unlock(&devtree_lock);
	return np;
}
EXPORT_SYMBOL(of_find_all_nodes);

/**
 *	of_get_parent - Get a node's parent if any
 *	@node:	Node to get parent
 *
 *	Returns a node pointer with refcount incremented, use
 *	of_node_put() on it when done.
 */
struct device_node *of_get_parent(const struct device_node *node)
{
	struct device_node *np;

	if (!node)
		return NULL;

	read_lock(&devtree_lock);
	np = of_node_get(node->parent);
	read_unlock(&devtree_lock);
	return np;
}
EXPORT_SYMBOL(of_get_parent);

/**
 *	of_get_next_child - Iterate a node childs
 *	@node:	parent node
 *	@prev:	previous child of the parent node, or NULL to get first
 *
 *	Returns a node pointer with refcount incremented, use
 *	of_node_put() on it when done.
 */
struct device_node *of_get_next_child(const struct device_node *node,
	struct device_node *prev)
{
	struct device_node *next;

	read_lock(&devtree_lock);
	next = prev ? prev->sibling : node->child;
	for (; next != 0; next = next->sibling)
		if (of_node_get(next))
			break;
	if (prev)
		of_node_put(prev);
	read_unlock(&devtree_lock);
	return next;
}
EXPORT_SYMBOL(of_get_next_child);

/**
 *	of_node_get - Increment refcount of a node
 *	@node:	Node to inc refcount, NULL is supported to
 *		simplify writing of callers
 *
 *	Returns the node itself or NULL if gone.
 */
struct device_node *of_node_get(struct device_node *node)
{
	if (node && !OF_IS_STALE(node)) {
		atomic_inc(&node->_users);
		return node;
	}
	return NULL;
}
EXPORT_SYMBOL(of_node_get);

/**
 *	of_node_cleanup - release a dynamically allocated node
 *	@arg:  Node to be released
 */
static void of_node_cleanup(struct device_node *node)
{
	struct property *prop = node->properties;

	if (!OF_IS_DYNAMIC(node))
		return;
	while (prop) {
		struct property *next = prop->next;
		kfree(prop->name);
		kfree(prop->value);
		kfree(prop);
		prop = next;
	}
	kfree(node->intrs);
	kfree(node->addrs);
	kfree(node->full_name);
	kfree(node);
}

/**
 *	of_node_put - Decrement refcount of a node
 *	@node:	Node to dec refcount, NULL is supported to
 *		simplify writing of callers
 *
 */
void of_node_put(struct device_node *node)
{
	if (!node)
		return;

	WARN_ON(0 == atomic_read(&node->_users));

	if (OF_IS_STALE(node)) {
		if (atomic_dec_and_test(&node->_users)) {
			of_node_cleanup(node);
			return;
		}
	}
	else
		atomic_dec(&node->_users);
}
EXPORT_SYMBOL(of_node_put);

/**
 *	derive_parent - basically like dirname(1)
 *	@path:  the full_name of a node to be added to the tree
 *
 *	Returns the node which should be the parent of the node
 *	described by path.  E.g., for path = "/foo/bar", returns
 *	the node with full_name = "/foo".
 */
static struct device_node *derive_parent(const char *path)
{
	struct device_node *parent = NULL;
	char *parent_path = "/";
	size_t parent_path_len = strrchr(path, '/') - path + 1;

	/* reject if path is "/" */
	if (!strcmp(path, "/"))
		return NULL;

	if (strrchr(path, '/') != path) {
		parent_path = kmalloc(parent_path_len, GFP_KERNEL);
		if (!parent_path)
			return NULL;
		strlcpy(parent_path, path, parent_path_len);
	}
	parent = of_find_node_by_path(parent_path);
	if (strcmp(parent_path, "/"))
		kfree(parent_path);
	return parent;
}

/*
 * Routines for "runtime" addition and removal of device tree nodes.
 */
#ifdef CONFIG_PROC_DEVICETREE
/*
 * Add a node to /proc/device-tree.
 */
static void add_node_proc_entries(struct device_node *np)
{
	struct proc_dir_entry *ent;

	ent = proc_mkdir(strrchr(np->full_name, '/') + 1, np->parent->pde);
	if (ent)
		proc_device_tree_add_node(np, ent);
}

static void remove_node_proc_entries(struct device_node *np)
{
	struct property *pp = np->properties;
	struct device_node *parent = np->parent;

	while (pp) {
		remove_proc_entry(pp->name, np->pde);
		pp = pp->next;
	}

	/* Assuming that symlinks have the same parent directory as
	 * np->pde.
	 */
	if (np->name_link)
		remove_proc_entry(np->name_link->name, parent->pde);
	if (np->addr_link)
		remove_proc_entry(np->addr_link->name, parent->pde);
	if (np->pde)
		remove_proc_entry(np->pde->name, parent->pde);
}
#else /* !CONFIG_PROC_DEVICETREE */
static void add_node_proc_entries(struct device_node *np)
{
	return;
}

static void remove_node_proc_entries(struct device_node *np)
{
	return;
}
#endif /* CONFIG_PROC_DEVICETREE */

/*
 * Fix up n_intrs and intrs fields in a new device node
 *
 */
static int of_finish_dynamic_node_interrupts(struct device_node *node)
{
	int intrcells, intlen, i;
	unsigned *irq, *ints, virq;
	struct device_node *ic;

	ints = (unsigned int *)get_property(node, "interrupts", &intlen);
	intrcells = prom_n_intr_cells(node);
	intlen /= intrcells * sizeof(unsigned int);
	node->n_intrs = intlen;
	node->intrs = kmalloc(sizeof(struct interrupt_info) * intlen,
			      GFP_KERNEL);
	if (!node->intrs)
		return -ENOMEM;

	for (i = 0; i < intlen; ++i) {
		int n, j;
		node->intrs[i].line = 0;
		node->intrs[i].sense = 1;
		n = map_interrupt(&irq, &ic, node, ints, intrcells);
		if (n <= 0)
			continue;
		virq = virt_irq_create_mapping(irq[0]);
		if (virq == NO_IRQ) {
			printk(KERN_CRIT "Could not allocate interrupt "
			       "number for %s\n", node->full_name);
			return -ENOMEM;
		}
		node->intrs[i].line = irq_offset_up(virq);
		if (n > 1)
			node->intrs[i].sense = irq[1];
		if (n > 2) {
			printk(KERN_DEBUG "hmmm, got %d intr cells for %s:", n,
			       node->full_name);
			for (j = 0; j < n; ++j)
				printk(" %d", irq[j]);
			printk("\n");
		}
		ints += intrcells;
	}
	return 0;
}

/*
 * Fix up the uninitialized fields in a new device node:
 * name, type, n_addrs, addrs, n_intrs, intrs, and pci-specific fields
 *
 * A lot of boot-time code is duplicated here, because functions such
 * as finish_node_interrupts, interpret_pci_props, etc. cannot use the
 * slab allocator.
 *
 * This should probably be split up into smaller chunks.
 */

static int of_finish_dynamic_node(struct device_node *node)
{
	struct device_node *parent = of_get_parent(node);
	u32 *regs;
	int err = 0;
	phandle *ibm_phandle;
 
	node->name = get_property(node, "name", 0);
	node->type = get_property(node, "device_type", 0);

	if (!parent) {
		err = -ENODEV;
		goto out;
	}

	/* We don't support that function on PowerMac, at least
	 * not yet
	 */
	if (systemcfg->platform == PLATFORM_POWERMAC)
		return -ENODEV;

	/* fix up new node's linux_phandle field */
	if ((ibm_phandle = (unsigned int *)get_property(node, "ibm,phandle", NULL)))
		node->linux_phandle = *ibm_phandle;

	/* do the work of interpret_pci_props */
	if (parent->type && !strcmp(parent->type, "pci")) {
		struct address_range *adr;
		struct pci_reg_property *pci_addrs;
		int i, l;

		pci_addrs = (struct pci_reg_property *)
			get_property(node, "assigned-addresses", &l);
		if (pci_addrs != 0 && l >= sizeof(struct pci_reg_property)) {
			i = 0;
			adr = kmalloc(sizeof(struct address_range) * 
				      (l / sizeof(struct pci_reg_property)),
				      GFP_KERNEL);
			if (!adr) {
				err = -ENOMEM;
				goto out;
			}
			while ((l -= sizeof(struct pci_reg_property)) >= 0) {
				adr[i].space = pci_addrs[i].addr.a_hi;
				adr[i].address = pci_addrs[i].addr.a_lo;
				adr[i].size = pci_addrs[i].size_lo;
				++i;
			}
			node->addrs = adr;
			node->n_addrs = i;
		}
	}

	/* now do the work of finish_node_interrupts */
	if (get_property(node, "interrupts", 0)) {
		err = of_finish_dynamic_node_interrupts(node);
		if (err) goto out;
	}

       /* now do the rough equivalent of update_dn_pci_info, this
        * probably is not correct for phb's, but should work for
	* IOAs and slots.
        */

       node->phb = parent->phb;

       regs = (u32 *)get_property(node, "reg", 0);
       if (regs) {
               node->busno = (regs[0] >> 16) & 0xff;
               node->devfn = (regs[0] >> 8) & 0xff;
       }

	/* fixing up iommu_table */

	if(strcmp(node->name, "pci") == 0 &&
                get_property(node, "ibm,dma-window", NULL)) {
                node->bussubno = node->busno;
                iommu_devnode_init(node);
        }
	else
		node->iommu_table = parent->iommu_table;

out:
	of_node_put(parent);
	return err;
}

/*
 * Given a path and a property list, construct an OF device node, add
 * it to the device tree and global list, and place it in
 * /proc/device-tree.  This function may sleep.
 */
int of_add_node(const char *path, struct property *proplist)
{
	struct device_node *np;
	int err = 0;

	np = kmalloc(sizeof(struct device_node), GFP_KERNEL);
	if (!np)
		return -ENOMEM;

	memset(np, 0, sizeof(*np));

	np->full_name = kmalloc(strlen(path) + 1, GFP_KERNEL);
	if (!np->full_name) {
		kfree(np);
		return -ENOMEM;
	}
	strcpy(np->full_name, path);

	np->properties = proplist;
	OF_MARK_DYNAMIC(np);
	of_node_get(np);
	np->parent = derive_parent(path);
	if (!np->parent) {
		kfree(np);
		return -EINVAL; /* could also be ENOMEM, though */
	}

	if (0 != (err = of_finish_dynamic_node(np))) {
		kfree(np);
		return err;
	}

	write_lock(&devtree_lock);
	np->sibling = np->parent->child;
	np->allnext = allnodes;
	np->parent->child = np;
	allnodes = np;
	write_unlock(&devtree_lock);

	add_node_proc_entries(np);

	of_node_put(np->parent);
	of_node_put(np);
	return 0;
}

/*
 * Remove an OF device node from the system.
 * Caller should have already "gotten" np.
 */
int of_remove_node(struct device_node *np)
{
	struct device_node *parent, *child;

	parent = of_get_parent(np);
	if (!parent)
		return -EINVAL;

	if ((child = of_get_next_child(np, NULL))) {
		of_node_put(child);
		return -EBUSY;
	}

	write_lock(&devtree_lock);
	OF_MARK_STALE(np);
	remove_node_proc_entries(np);
	if (allnodes == np)
		allnodes = np->allnext;
	else {
		struct device_node *prev;
		for (prev = allnodes;
		     prev->allnext != np;
		     prev = prev->allnext)
			;
		prev->allnext = np->allnext;
	}

	if (parent->child == np)
		parent->child = np->sibling;
	else {
		struct device_node *prevsib;
		for (prevsib = np->parent->child;
		     prevsib->sibling != np;
		     prevsib = prevsib->sibling)
			;
		prevsib->sibling = np->sibling;
	}
	write_unlock(&devtree_lock);
	of_node_put(parent);
	return 0;
}

/*
 * Find a property with a given name for a given node
 * and return the value.
 */
unsigned char *
get_property(struct device_node *np, const char *name, int *lenp)
{
	struct property *pp;

	for (pp = np->properties; pp != 0; pp = pp->next)
		if (strcmp(pp->name, name) == 0) {
			if (lenp != 0)
				*lenp = pp->length;
			return pp->value;
		}
	return 0;
}

/*
 * Add a property to a node
 */
void
prom_add_property(struct device_node* np, struct property* prop)
{
	struct property **next = &np->properties;

	prop->next = NULL;	
	while (*next)
		next = &(*next)->next;
	*next = prop;
}

#if 0
void
print_properties(struct device_node *np)
{
	struct property *pp;
	char *cp;
	int i, n;

	for (pp = np->properties; pp != 0; pp = pp->next) {
		printk(KERN_INFO "%s", pp->name);
		for (i = strlen(pp->name); i < 16; ++i)
			printk(" ");
		cp = (char *) pp->value;
		for (i = pp->length; i > 0; --i, ++cp)
			if ((i > 1 && (*cp < 0x20 || *cp > 0x7e))
			    || (i == 1 && *cp != 0))
				break;
		if (i == 0 && pp->length > 1) {
			/* looks like a string */
			printk(" %s\n", (char *) pp->value);
		} else {
			/* dump it in hex */
			n = pp->length;
			if (n > 64)
				n = 64;
			if (pp->length % 4 == 0) {
				unsigned int *p = (unsigned int *) pp->value;

				n /= 4;
				for (i = 0; i < n; ++i) {
					if (i != 0 && (i % 4) == 0)
						printk("\n                ");
					printk(" %08x", *p++);
				}
			} else {
				unsigned char *bp = pp->value;

				for (i = 0; i < n; ++i) {
					if (i != 0 && (i % 16) == 0)
						printk("\n                ");
					printk(" %02x", *bp++);
				}
			}
			printk("\n");
			if (pp->length > 64)
				printk("                 ... (length = %d)\n",
				       pp->length);
		}
	}
}
#endif
