prom_init.c 55.3 KB
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/*
 * Procedures for interfacing to Open Firmware.
 *
 * Paul Mackerras	August 1996.
 * Copyright (C) 1996-2005 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.
 */

#undef DEBUG_PROM

#include <stdarg.h>
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/init.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 <linux/bitops.h>
#include <asm/prom.h>
#include <asm/rtas.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/pci.h>
#include <asm/iommu.h>
#include <asm/btext.h>
#include <asm/sections.h>
#include <asm/machdep.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)

/*
 * Eventually bump that one up
 */
#define DEVTREE_CHUNK_SIZE	0x100000

/*
 * This is the size of the local memory reserve map that gets copied
 * into the boot params passed to the kernel. That size is totally
 * flexible as the kernel just reads the list until it encounters an
 * entry with size 0, so it can be changed without breaking binary
 * compatibility
 */
#define MEM_RESERVE_MAP_SIZE	8

/*
 * 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.
 * On ppc32 we compile with -mrelocatable, which means that references
 * to extern and static variables get relocated automatically.
 * On ppc64 we have to relocate the references explicitly with
 * RELOC.  (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 must be done within prom_init().
 *
 * ADDR is used in calls to call_prom.  The 4th and following
 * arguments to call_prom should be 32-bit values.
 * On ppc64, 64 bit values are truncated to 32 bits (and
 * fortunately don't get interpreted as two arguments).
 */
#ifdef CONFIG_PPC64
#define RELOC(x)        (*PTRRELOC(&(x)))
#define ADDR(x)		(u32) add_reloc_offset((unsigned long)(x))
#else
#define RELOC(x)	(x)
#define ADDR(x)		(u32) (x)
#endif

#define PROM_BUG() do {						\
        prom_printf("kernel BUG at %s line 0x%x!\n",		\
		    RELOC(__FILE__), __LINE__);			\
        __asm__ __volatile__(".long " BUG_ILLEGAL_INSTR);	\
} while (0)

#ifdef DEBUG_PROM
#define prom_debug(x...)	prom_printf(x)
#else
#define prom_debug(x...)
#endif

#ifdef CONFIG_PPC32
#define PLATFORM_POWERMAC	_MACH_Pmac
#define PLATFORM_CHRP		_MACH_chrp
#endif


typedef u32 prom_arg_t;

struct prom_args {
        u32 service;
        u32 nargs;
        u32 nret;
        prom_arg_t args[10];
};

struct prom_t {
	ihandle root;
	ihandle chosen;
	int cpu;
	ihandle stdout;
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	ihandle mmumap;
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};

struct mem_map_entry {
	unsigned long	base;
	unsigned long	size;
};

typedef u32 cell_t;

extern void __start(unsigned long r3, unsigned long r4, unsigned long r5);

#ifdef CONFIG_PPC64
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extern int enter_prom(struct prom_args *args, unsigned long entry);
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#else
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static inline int enter_prom(struct prom_args *args, unsigned long entry)
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{
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	return ((int (*)(struct prom_args *))entry)(args);
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}
#endif

extern void copy_and_flush(unsigned long dest, unsigned long src,
			   unsigned long size, unsigned long offset);

/* prom structure */
static struct prom_t __initdata prom;

static unsigned long prom_entry __initdata;

#define PROM_SCRATCH_SIZE 256

static char __initdata of_stdout_device[256];
static char __initdata prom_scratch[PROM_SCRATCH_SIZE];

static unsigned long __initdata dt_header_start;
static unsigned long __initdata dt_struct_start, dt_struct_end;
static unsigned long __initdata dt_string_start, dt_string_end;

static unsigned long __initdata prom_initrd_start, prom_initrd_end;

#ifdef CONFIG_PPC64
static int __initdata iommu_force_on;
static int __initdata ppc64_iommu_off;
static unsigned long __initdata prom_tce_alloc_start;
static unsigned long __initdata prom_tce_alloc_end;
#endif

static int __initdata of_platform;

static char __initdata prom_cmd_line[COMMAND_LINE_SIZE];

static unsigned long __initdata prom_memory_limit;

static unsigned long __initdata alloc_top;
static unsigned long __initdata alloc_top_high;
static unsigned long __initdata alloc_bottom;
static unsigned long __initdata rmo_top;
static unsigned long __initdata ram_top;

static struct mem_map_entry __initdata mem_reserve_map[MEM_RESERVE_MAP_SIZE];
static int __initdata mem_reserve_cnt;

static cell_t __initdata regbuf[1024];


#define MAX_CPU_THREADS 2

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

/*
 * Error results ... some OF calls will return "-1" on error, some
 * will return 0, some will return either. To simplify, here are
 * macros to use with any ihandle or phandle return value to check if
 * it is valid
 */

#define PROM_ERROR		(-1u)
#define PHANDLE_VALID(p)	((p) != 0 && (p) != PROM_ERROR)
#define IHANDLE_VALID(i)	((i) != 0 && (i) != PROM_ERROR)


/* This is the one and *ONLY* place where we actually call open
 * firmware.
 */

static int __init call_prom(const char *service, int nargs, int nret, ...)
{
	int i;
	struct prom_args args;
	va_list list;

	args.service = ADDR(service);
	args.nargs = nargs;
	args.nret = nret;

	va_start(list, nret);
	for (i = 0; i < nargs; i++)
		args.args[i] = va_arg(list, prom_arg_t);
	va_end(list);

	for (i = 0; i < nret; i++)
		args.args[nargs+i] = 0;

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	if (enter_prom(&args, RELOC(prom_entry)) < 0)
		return PROM_ERROR;
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	return (nret > 0) ? args.args[nargs] : 0;
}

static int __init call_prom_ret(const char *service, int nargs, int nret,
				prom_arg_t *rets, ...)
{
	int i;
	struct prom_args args;
	va_list list;

	args.service = ADDR(service);
	args.nargs = nargs;
	args.nret = nret;

	va_start(list, rets);
	for (i = 0; i < nargs; i++)
		args.args[i] = va_arg(list, prom_arg_t);
	va_end(list);

	for (i = 0; i < nret; i++)
		rets[nargs+i] = 0;

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	if (enter_prom(&args, RELOC(prom_entry)) < 0)
		return PROM_ERROR;
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	if (rets != NULL)
		for (i = 1; i < nret; ++i)
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			rets[i-1] = args.args[nargs+i];
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	return (nret > 0) ? args.args[nargs] : 0;
}


static void __init prom_print(const char *msg)
{
	const char *p, *q;
	struct prom_t *_prom = &RELOC(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("write", 3, 1, _prom->stdout, p, q - p);
		if (*q == 0)
			break;
		++q;
		call_prom("write", 3, 1, _prom->stdout, ADDR("\r\n"), 2);
	}
}


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

	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';
	call_prom("write", 3, 1, _prom->stdout, buf, nibbles);
}


static void __init prom_printf(const char *format, ...)
{
	const char *p, *q, *s;
	va_list args;
	unsigned long v;
	struct prom_t *_prom = &RELOC(prom);

	va_start(args, format);
#ifdef CONFIG_PPC64
	format = PTRRELOC(format);
#endif
	for (p = format; *p != 0; p = q) {
		for (q = p; *q != 0 && *q != '\n' && *q != '%'; ++q)
			;
		if (q > p)
			call_prom("write", 3, 1, _prom->stdout, p, q - p);
		if (*q == 0)
			break;
		if (*q == '\n') {
			++q;
			call_prom("write", 3, 1, _prom->stdout,
				  ADDR("\r\n"), 2);
			continue;
		}
		++q;
		if (*q == 0)
			break;
		switch (*q) {
		case 's':
			++q;
			s = va_arg(args, const char *);
			prom_print(s);
			break;
		case 'x':
			++q;
			v = va_arg(args, unsigned long);
			prom_print_hex(v);
			break;
		}
	}
}


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static unsigned int __init prom_claim(unsigned long virt, unsigned long size,
				unsigned long align)
{
	int ret;
	struct prom_t *_prom = &RELOC(prom);

	ret = call_prom("claim", 3, 1, (prom_arg_t)virt, (prom_arg_t)size,
			(prom_arg_t)align);
	if (ret != -1 && _prom->mmumap != 0)
		/* old pmacs need us to map as well */
		call_prom("call-method", 6, 1,
			  ADDR("map"), _prom->mmumap, 0, size, virt, virt);
	return ret;
}

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static void __init __attribute__((noreturn)) prom_panic(const char *reason)
{
#ifdef CONFIG_PPC64
	reason = PTRRELOC(reason);
#endif
	prom_print(reason);
	/* ToDo: should put up an SRC here on p/iSeries */
	call_prom("exit", 0, 0);

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


static int __init prom_next_node(phandle *nodep)
{
	phandle node;

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

static int __init prom_getprop(phandle node, const char *pname,
			       void *value, size_t valuelen)
{
	return call_prom("getprop", 4, 1, node, ADDR(pname),
			 (u32)(unsigned long) value, (u32) valuelen);
}

static int __init prom_getproplen(phandle node, const char *pname)
{
	return call_prom("getproplen", 2, 1, node, ADDR(pname));
}

static int __init prom_setprop(phandle node, const char *pname,
			       void *value, size_t valuelen)
{
	return call_prom("setprop", 4, 1, node, ADDR(pname),
			 (u32)(unsigned long) value, (u32) valuelen);
}

/* We can't use the standard versions because of RELOC headaches. */
#define isxdigit(c)	(('0' <= (c) && (c) <= '9') \
			 || ('a' <= (c) && (c) <= 'f') \
			 || ('A' <= (c) && (c) <= 'F'))

#define isdigit(c)	('0' <= (c) && (c) <= '9')
#define islower(c)	('a' <= (c) && (c) <= 'z')
#define toupper(c)	(islower(c) ? ((c) - 'a' + 'A') : (c))

unsigned long prom_strtoul(const char *cp, const char **endp)
{
	unsigned long result = 0, base = 10, value;

	if (*cp == '0') {
		base = 8;
		cp++;
		if (toupper(*cp) == 'X') {
			cp++;
			base = 16;
		}
	}

	while (isxdigit(*cp) &&
	       (value = isdigit(*cp) ? *cp - '0' : toupper(*cp) - 'A' + 10) < base) {
		result = result * base + value;
		cp++;
	}

	if (endp)
		*endp = cp;

	return result;
}

unsigned long prom_memparse(const char *ptr, const char **retptr)
{
	unsigned long ret = prom_strtoul(ptr, retptr);
	int shift = 0;

	/*
	 * We can't use a switch here because GCC *may* generate a
	 * jump table which won't work, because we're not running at
	 * the address we're linked at.
	 */
	if ('G' == **retptr || 'g' == **retptr)
		shift = 30;

	if ('M' == **retptr || 'm' == **retptr)
		shift = 20;

	if ('K' == **retptr || 'k' == **retptr)
		shift = 10;

	if (shift) {
		ret <<= shift;
		(*retptr)++;
	}

	return ret;
}

/*
 * Early parsing of the command line passed to the kernel, used for
 * "mem=x" and the options that affect the iommu
 */
static void __init early_cmdline_parse(void)
{
	struct prom_t *_prom = &RELOC(prom);
	char *opt, *p;
	int l = 0;

	RELOC(prom_cmd_line[0]) = 0;
	p = RELOC(prom_cmd_line);
	if ((long)_prom->chosen > 0)
		l = prom_getprop(_prom->chosen, "bootargs", p, COMMAND_LINE_SIZE-1);
#ifdef CONFIG_CMDLINE
	if (l == 0) /* dbl check */
		strlcpy(RELOC(prom_cmd_line),
			RELOC(CONFIG_CMDLINE), sizeof(prom_cmd_line));
#endif /* CONFIG_CMDLINE */
	prom_printf("command line: %s\n", RELOC(prom_cmd_line));

#ifdef CONFIG_PPC64
	opt = strstr(RELOC(prom_cmd_line), RELOC("iommu="));
	if (opt) {
		prom_printf("iommu opt is: %s\n", opt);
		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;
	}
#endif

	opt = strstr(RELOC(prom_cmd_line), RELOC("mem="));
	if (opt) {
		opt += 4;
		RELOC(prom_memory_limit) = prom_memparse(opt, (const char **)&opt);
#ifdef CONFIG_PPC64
		/* Align to 16 MB == size of ppc64 large page */
		RELOC(prom_memory_limit) = ALIGN(RELOC(prom_memory_limit), 0x1000000);
#endif
	}
}

#ifdef CONFIG_PPC_PSERIES
/*
 * To tell the firmware what our capabilities are, we have to pass
 * it a fake 32-bit ELF header containing a couple of PT_NOTE sections
 * that contain structures that contain the actual values.
 */
static struct fake_elf {
	Elf32_Ehdr	elfhdr;
	Elf32_Phdr	phdr[2];
	struct chrpnote {
		u32	namesz;
		u32	descsz;
		u32	type;
		char	name[8];	/* "PowerPC" */
		struct chrpdesc {
			u32	real_mode;
			u32	real_base;
			u32	real_size;
			u32	virt_base;
			u32	virt_size;
			u32	load_base;
		} chrpdesc;
	} chrpnote;
	struct rpanote {
		u32	namesz;
		u32	descsz;
		u32	type;
		char	name[24];	/* "IBM,RPA-Client-Config" */
		struct rpadesc {
			u32	lpar_affinity;
			u32	min_rmo_size;
			u32	min_rmo_percent;
			u32	max_pft_size;
			u32	splpar;
			u32	min_load;
			u32	new_mem_def;
			u32	ignore_me;
		} rpadesc;
	} rpanote;
} fake_elf = {
	.elfhdr = {
		.e_ident = { 0x7f, 'E', 'L', 'F',
			     ELFCLASS32, ELFDATA2MSB, EV_CURRENT },
		.e_type = ET_EXEC,	/* yeah right */
		.e_machine = EM_PPC,
		.e_version = EV_CURRENT,
		.e_phoff = offsetof(struct fake_elf, phdr),
		.e_phentsize = sizeof(Elf32_Phdr),
		.e_phnum = 2
	},
	.phdr = {
		[0] = {
			.p_type = PT_NOTE,
			.p_offset = offsetof(struct fake_elf, chrpnote),
			.p_filesz = sizeof(struct chrpnote)
		}, [1] = {
			.p_type = PT_NOTE,
			.p_offset = offsetof(struct fake_elf, rpanote),
			.p_filesz = sizeof(struct rpanote)
		}
	},
	.chrpnote = {
		.namesz = sizeof("PowerPC"),
		.descsz = sizeof(struct chrpdesc),
		.type = 0x1275,
		.name = "PowerPC",
		.chrpdesc = {
			.real_mode = ~0U,	/* ~0 means "don't care" */
			.real_base = ~0U,
			.real_size = ~0U,
			.virt_base = ~0U,
			.virt_size = ~0U,
			.load_base = ~0U
		},
	},
	.rpanote = {
		.namesz = sizeof("IBM,RPA-Client-Config"),
		.descsz = sizeof(struct rpadesc),
		.type = 0x12759999,
		.name = "IBM,RPA-Client-Config",
		.rpadesc = {
			.lpar_affinity = 0,
			.min_rmo_size = 64,	/* in megabytes */
			.min_rmo_percent = 0,
			.max_pft_size = 48,	/* 2^48 bytes max PFT size */
			.splpar = 1,
			.min_load = ~0U,
			.new_mem_def = 0
		}
	}
};

static void __init prom_send_capabilities(void)
{
	ihandle elfloader;

	elfloader = call_prom("open", 1, 1, ADDR("/packages/elf-loader"));
	if (elfloader == 0) {
		prom_printf("couldn't open /packages/elf-loader\n");
		return;
	}
	call_prom("call-method", 3, 1, ADDR("process-elf-header"),
			elfloader, ADDR(&fake_elf));
	call_prom("close", 1, 0, elfloader);
}
#endif

/*
 * Memory allocation strategy... our layout is normally:
 *
 *  at 14Mb or more we have vmlinux, then a gap and initrd.  In some
 *  rare cases, initrd might end up being before the kernel though.
 *  We assume this won't override the final kernel at 0, we have no
 *  provision to handle that in this version, but it should hopefully
 *  never happen.
 *
 *  alloc_top is set to the top of RMO, eventually shrink down if the
 *  TCEs overlap
 *
 *  alloc_bottom is set to the top of kernel/initrd
 *
 *  from there, allocations are done this way : rtas is allocated
 *  topmost, and the device-tree is allocated from the bottom. We try
 *  to grow the device-tree allocation as we progress. If we can't,
 *  then we fail, we don't currently have a facility to restart
 *  elsewhere, but that shouldn't be necessary.
 *
 *  Note that calls to reserve_mem have to be done explicitly, memory
 *  allocated with either alloc_up or alloc_down isn't automatically
 *  reserved.
 */


/*
 * Allocates memory in the RMO upward from the kernel/initrd
 *
 * When align is 0, this is a special case, it means to allocate in place
 * at the current location of alloc_bottom or fail (that is basically
 * extending the previous allocation). Used for the device-tree flattening
 */
static unsigned long __init alloc_up(unsigned long size, unsigned long align)
{
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	unsigned long base = RELOC(alloc_bottom);
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	unsigned long addr = 0;

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	if (align)
		base = _ALIGN_UP(base, align);
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	prom_debug("alloc_up(%x, %x)\n", size, align);
	if (RELOC(ram_top) == 0)
		prom_panic("alloc_up() called with mem not initialized\n");

	if (align)
		base = _ALIGN_UP(RELOC(alloc_bottom), align);
	else
		base = RELOC(alloc_bottom);

	for(; (base + size) <= RELOC(alloc_top); 
	    base = _ALIGN_UP(base + 0x100000, align)) {
		prom_debug("    trying: 0x%x\n\r", base);
		addr = (unsigned long)prom_claim(base, size, 0);
692
		if (addr != PROM_ERROR && addr != 0)
693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751
			break;
		addr = 0;
		if (align == 0)
			break;
	}
	if (addr == 0)
		return 0;
	RELOC(alloc_bottom) = addr;

	prom_debug(" -> %x\n", addr);
	prom_debug("  alloc_bottom : %x\n", RELOC(alloc_bottom));
	prom_debug("  alloc_top    : %x\n", RELOC(alloc_top));
	prom_debug("  alloc_top_hi : %x\n", RELOC(alloc_top_high));
	prom_debug("  rmo_top      : %x\n", RELOC(rmo_top));
	prom_debug("  ram_top      : %x\n", RELOC(ram_top));

	return addr;
}

/*
 * Allocates memory downward, either from top of RMO, or if highmem
 * is set, from the top of RAM.  Note that this one doesn't handle
 * failures.  It does claim memory if highmem is not set.
 */
static unsigned long __init alloc_down(unsigned long size, unsigned long align,
				       int highmem)
{
	unsigned long base, addr = 0;

	prom_debug("alloc_down(%x, %x, %s)\n", size, align,
		   highmem ? RELOC("(high)") : RELOC("(low)"));
	if (RELOC(ram_top) == 0)
		prom_panic("alloc_down() called with mem not initialized\n");

	if (highmem) {
		/* Carve out storage for the TCE table. */
		addr = _ALIGN_DOWN(RELOC(alloc_top_high) - size, align);
		if (addr <= RELOC(alloc_bottom))
			return 0;
		/* Will we bump into the RMO ? If yes, check out that we
		 * didn't overlap existing allocations there, if we did,
		 * we are dead, we must be the first in town !
		 */
		if (addr < RELOC(rmo_top)) {
			/* Good, we are first */
			if (RELOC(alloc_top) == RELOC(rmo_top))
				RELOC(alloc_top) = RELOC(rmo_top) = addr;
			else
				return 0;
		}
		RELOC(alloc_top_high) = addr;
		goto bail;
	}

	base = _ALIGN_DOWN(RELOC(alloc_top) - size, align);
	for (; base > RELOC(alloc_bottom);
	     base = _ALIGN_DOWN(base - 0x100000, align))  {
		prom_debug("    trying: 0x%x\n\r", base);
		addr = (unsigned long)prom_claim(base, size, 0);
752
		if (addr != PROM_ERROR && addr != 0)
753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785
			break;
		addr = 0;
	}
	if (addr == 0)
		return 0;
	RELOC(alloc_top) = addr;

 bail:
	prom_debug(" -> %x\n", addr);
	prom_debug("  alloc_bottom : %x\n", RELOC(alloc_bottom));
	prom_debug("  alloc_top    : %x\n", RELOC(alloc_top));
	prom_debug("  alloc_top_hi : %x\n", RELOC(alloc_top_high));
	prom_debug("  rmo_top      : %x\n", RELOC(rmo_top));
	prom_debug("  ram_top      : %x\n", RELOC(ram_top));

	return addr;
}

/*
 * Parse a "reg" cell
 */
static unsigned long __init prom_next_cell(int s, cell_t **cellp)
{
	cell_t *p = *cellp;
	unsigned long r = 0;

	/* Ignore more than 2 cells */
	while (s > sizeof(unsigned long) / 4) {
		p++;
		s--;
	}
	r = *p++;
#ifdef CONFIG_PPC64
786
	if (s > 1) {
787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857
		r <<= 32;
		r |= *(p++);
	}
#endif
	*cellp = p;
	return r;
}

/*
 * Very dumb function for adding to the memory reserve list, but
 * we don't need anything smarter at this point
 *
 * XXX Eventually check for collisions.  They should NEVER happen.
 * If problems seem to show up, it would be a good start to track
 * them down.
 */
static void reserve_mem(unsigned long base, unsigned long size)
{
	unsigned long top = base + size;
	unsigned long cnt = RELOC(mem_reserve_cnt);

	if (size == 0)
		return;

	/* We need to always keep one empty entry so that we
	 * have our terminator with "size" set to 0 since we are
	 * dumb and just copy this entire array to the boot params
	 */
	base = _ALIGN_DOWN(base, PAGE_SIZE);
	top = _ALIGN_UP(top, PAGE_SIZE);
	size = top - base;

	if (cnt >= (MEM_RESERVE_MAP_SIZE - 1))
		prom_panic("Memory reserve map exhausted !\n");
	RELOC(mem_reserve_map)[cnt].base = base;
	RELOC(mem_reserve_map)[cnt].size = size;
	RELOC(mem_reserve_cnt) = cnt + 1;
}

/*
 * Initialize memory allocation mecanism, parse "memory" nodes and
 * obtain that way the top of memory and RMO to setup out local allocator
 */
static void __init prom_init_mem(void)
{
	phandle node;
	char *path, type[64];
	unsigned int plen;
	cell_t *p, *endp;
	struct prom_t *_prom = &RELOC(prom);
	u32 rac, rsc;

	/*
	 * We iterate the memory nodes to find
	 * 1) top of RMO (first node)
	 * 2) top of memory
	 */
	rac = 2;
	prom_getprop(_prom->root, "#address-cells", &rac, sizeof(rac));
	rsc = 1;
	prom_getprop(_prom->root, "#size-cells", &rsc, sizeof(rsc));
	prom_debug("root_addr_cells: %x\n", (unsigned long) rac);
	prom_debug("root_size_cells: %x\n", (unsigned long) rsc);

	prom_debug("scanning memory:\n");
	path = RELOC(prom_scratch);

	for (node = 0; prom_next_node(&node); ) {
		type[0] = 0;
		prom_getprop(node, "device_type", type, sizeof(type));

858 859 860 861 862 863 864
		if (type[0] == 0) {
			/*
			 * CHRP Longtrail machines have no device_type
			 * on the memory node, so check the name instead...
			 */
			prom_getprop(node, "name", type, sizeof(type));
		}
865 866
		if (strcmp(type, RELOC("memory")))
			continue;
867

868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167
		plen = prom_getprop(node, "reg", RELOC(regbuf), sizeof(regbuf));
		if (plen > sizeof(regbuf)) {
			prom_printf("memory node too large for buffer !\n");
			plen = sizeof(regbuf);
		}
		p = RELOC(regbuf);
		endp = p + (plen / sizeof(cell_t));

#ifdef DEBUG_PROM
		memset(path, 0, PROM_SCRATCH_SIZE);
		call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
		prom_debug("  node %s :\n", path);
#endif /* DEBUG_PROM */

		while ((endp - p) >= (rac + rsc)) {
			unsigned long base, size;

			base = prom_next_cell(rac, &p);
			size = prom_next_cell(rsc, &p);

			if (size == 0)
				continue;
			prom_debug("    %x %x\n", base, size);
			if (base == 0)
				RELOC(rmo_top) = size;
			if ((base + size) > RELOC(ram_top))
				RELOC(ram_top) = base + size;
		}
	}

	RELOC(alloc_bottom) = PAGE_ALIGN((unsigned long)&RELOC(_end) + 0x4000);

	/* Check if we have an initrd after the kernel, if we do move our bottom
	 * point to after it
	 */
	if (RELOC(prom_initrd_start)) {
		if (RELOC(prom_initrd_end) > RELOC(alloc_bottom))
			RELOC(alloc_bottom) = PAGE_ALIGN(RELOC(prom_initrd_end));
	}

	/*
	 * If prom_memory_limit is set we reduce the upper limits *except* for
	 * alloc_top_high. This must be the real top of RAM so we can put
	 * TCE's up there.
	 */

	RELOC(alloc_top_high) = RELOC(ram_top);

	if (RELOC(prom_memory_limit)) {
		if (RELOC(prom_memory_limit) <= RELOC(alloc_bottom)) {
			prom_printf("Ignoring mem=%x <= alloc_bottom.\n",
				RELOC(prom_memory_limit));
			RELOC(prom_memory_limit) = 0;
		} else if (RELOC(prom_memory_limit) >= RELOC(ram_top)) {
			prom_printf("Ignoring mem=%x >= ram_top.\n",
				RELOC(prom_memory_limit));
			RELOC(prom_memory_limit) = 0;
		} else {
			RELOC(ram_top) = RELOC(prom_memory_limit);
			RELOC(rmo_top) = min(RELOC(rmo_top), RELOC(prom_memory_limit));
		}
	}

	/*
	 * Setup our top alloc point, that is top of RMO or top of
	 * segment 0 when running non-LPAR.
	 * Some RS64 machines have buggy firmware where claims up at
	 * 1GB fail.  Cap at 768MB as a workaround.
	 * Since 768MB is plenty of room, and we need to cap to something
	 * reasonable on 32-bit, cap at 768MB on all machines.
	 */
	if (!RELOC(rmo_top))
		RELOC(rmo_top) = RELOC(ram_top);
	RELOC(rmo_top) = min(0x30000000ul, RELOC(rmo_top));
	RELOC(alloc_top) = RELOC(rmo_top);

	prom_printf("memory layout at init:\n");
	prom_printf("  memory_limit : %x (16 MB aligned)\n", RELOC(prom_memory_limit));
	prom_printf("  alloc_bottom : %x\n", RELOC(alloc_bottom));
	prom_printf("  alloc_top    : %x\n", RELOC(alloc_top));
	prom_printf("  alloc_top_hi : %x\n", RELOC(alloc_top_high));
	prom_printf("  rmo_top      : %x\n", RELOC(rmo_top));
	prom_printf("  ram_top      : %x\n", RELOC(ram_top));
}


/*
 * Allocate room for and instantiate RTAS
 */
static void __init prom_instantiate_rtas(void)
{
	phandle rtas_node;
	ihandle rtas_inst;
	u32 base, entry = 0;
	u32 size = 0;

	prom_debug("prom_instantiate_rtas: start...\n");

	rtas_node = call_prom("finddevice", 1, 1, ADDR("/rtas"));
	prom_debug("rtas_node: %x\n", rtas_node);
	if (!PHANDLE_VALID(rtas_node))
		return;

	prom_getprop(rtas_node, "rtas-size", &size, sizeof(size));
	if (size == 0)
		return;

	base = alloc_down(size, PAGE_SIZE, 0);
	if (base == 0) {
		prom_printf("RTAS allocation failed !\n");
		return;
	}

	rtas_inst = call_prom("open", 1, 1, ADDR("/rtas"));
	if (!IHANDLE_VALID(rtas_inst)) {
		prom_printf("opening rtas package failed");
		return;
	}

	prom_printf("instantiating rtas at 0x%x ...", base);

	if (call_prom_ret("call-method", 3, 2, &entry,
			  ADDR("instantiate-rtas"),
			  rtas_inst, base) == PROM_ERROR
	    || entry == 0) {
		prom_printf(" failed\n");
		return;
	}
	prom_printf(" done\n");

	reserve_mem(base, size);

	prom_setprop(rtas_node, "linux,rtas-base", &base, sizeof(base));
	prom_setprop(rtas_node, "linux,rtas-entry", &entry, sizeof(entry));

	prom_debug("rtas base     = 0x%x\n", base);
	prom_debug("rtas entry    = 0x%x\n", entry);
	prom_debug("rtas size     = 0x%x\n", (long)size);

	prom_debug("prom_instantiate_rtas: end...\n");
}

#ifdef CONFIG_PPC64
/*
 * Allocate room for and initialize TCE tables
 */
static void __init prom_initialize_tce_table(void)
{
	phandle node;
	ihandle phb_node;
	char compatible[64], type[64], model[64];
	char *path = RELOC(prom_scratch);
	u64 base, align;
	u32 minalign, minsize;
	u64 tce_entry, *tce_entryp;
	u64 local_alloc_top, local_alloc_bottom;
	u64 i;

	if (RELOC(ppc64_iommu_off))
		return;

	prom_debug("starting prom_initialize_tce_table\n");

	/* Cache current top of allocs so we reserve a single block */
	local_alloc_top = RELOC(alloc_top_high);
	local_alloc_bottom = local_alloc_top;

	/* Search all nodes looking for PHBs. */
	for (node = 0; prom_next_node(&node); ) {
		compatible[0] = 0;
		type[0] = 0;
		model[0] = 0;
		prom_getprop(node, "compatible",
			     compatible, sizeof(compatible));
		prom_getprop(node, "device_type", type, sizeof(type));
		prom_getprop(node, "model", model, sizeof(model));

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

		/* 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 (prom_getprop(node, "tce-table-minalign", &minalign,
				 sizeof(minalign)) == PROM_ERROR)
			minalign = 0;
		if (prom_getprop(node, "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);
		base = alloc_down(minsize, align, 1);
		if (base == 0)
			prom_panic("ERROR, cannot find space for TCE table.\n");
		if (base < local_alloc_bottom)
			local_alloc_bottom = base;

		/* Save away the TCE table attributes for later use. */
		prom_setprop(node, "linux,tce-base", &base, sizeof(base));
		prom_setprop(node, "linux,tce-size", &minsize, sizeof(minsize));

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

		prom_debug("TCE table: %s\n", path);
		prom_debug("\tnode = 0x%x\n", node);
		prom_debug("\tbase = 0x%x\n", base);
		prom_debug("\tsize = 0x%x\n", minsize);

		/* 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;
		}

		prom_printf("opening PHB %s", path);
		phb_node = call_prom("open", 1, 1, path);
		if (phb_node == 0)
			prom_printf("... failed\n");
		else
			prom_printf("... done\n");

		call_prom("call-method", 6, 0, ADDR("set-64-bit-addressing"),
			  phb_node, -1, minsize,
			  (u32) base, (u32) (base >> 32));
		call_prom("close", 1, 0, phb_node);
	}

	reserve_mem(local_alloc_bottom, local_alloc_top - local_alloc_bottom);

	if (RELOC(prom_memory_limit)) {
		/*
		 * We align the start to a 16MB boundary so we can map
		 * the TCE area using large pages if possible.
		 * The end should be the top of RAM so no need to align it.
		 */
		RELOC(prom_tce_alloc_start) = _ALIGN_DOWN(local_alloc_bottom,
							  0x1000000);
		RELOC(prom_tce_alloc_end) = local_alloc_top;
	}

	/* Flag the first invalid entry */
	prom_debug("ending prom_initialize_tce_table\n");
}
#endif

/*
 * With CHRP SMP we need to use the OF to start the other processors.
 * 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.
 *
 * -- Cort
 */
1168 1169 1170 1171 1172 1173 1174 1175 1176 1177
extern void __secondary_hold(void);
extern unsigned long __secondary_hold_spinloop;
extern unsigned long __secondary_hold_acknowledge;

/*
 * We want to reference the copy of __secondary_hold_* in the
 * 0 - 0x100 address range
 */
#define LOW_ADDR(x)	(((unsigned long) &(x)) & 0xff)

1178 1179 1180 1181 1182 1183 1184 1185 1186 1187
static void __init prom_hold_cpus(void)
{
	unsigned long i;
	unsigned int reg;
	phandle node;
	char type[64];
	int cpuid = 0;
	unsigned int interrupt_server[MAX_CPU_THREADS];
	unsigned int cpu_threads, hw_cpu_num;
	int propsize;
1188
	struct prom_t *_prom = &RELOC(prom);
1189
	unsigned long *spinloop
1190
		= (void *) LOW_ADDR(__secondary_hold_spinloop);
1191
	unsigned long *acknowledge
1192
		= (void *) LOW_ADDR(__secondary_hold_acknowledge);
1193
#ifdef CONFIG_PPC64
1194
	/* __secondary_hold is actually a descriptor, not the text address */
1195 1196 1197
	unsigned long secondary_hold
		= __pa(*PTRRELOC((unsigned long *)__secondary_hold));
#else
1198
	unsigned long secondary_hold = LOW_ADDR(__secondary_hold);
1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216
#endif

	prom_debug("prom_hold_cpus: start...\n");
	prom_debug("    1) spinloop       = 0x%x\n", (unsigned long)spinloop);
	prom_debug("    1) *spinloop      = 0x%x\n", *spinloop);
	prom_debug("    1) acknowledge    = 0x%x\n",
		   (unsigned long)acknowledge);
	prom_debug("    1) *acknowledge   = 0x%x\n", *acknowledge);
	prom_debug("    1) secondary_hold = 0x%x\n", secondary_hold);

	/* 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
1217
	for (i = 0; i < NR_CPUS; i++)
1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268
		RELOC(hmt_thread_data)[i].pir = 0xdeadbeef;
#endif
	/* look for cpus */
	for (node = 0; prom_next_node(&node); ) {
		type[0] = 0;
		prom_getprop(node, "device_type", type, sizeof(type));
		if (strcmp(type, RELOC("cpu")) != 0)
			continue;

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

		reg = -1;
		prom_getprop(node, "reg", &reg, sizeof(reg));

		prom_debug("\ncpuid        = 0x%x\n", cpuid);
		prom_debug("cpu hw idx   = 0x%x\n", 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 = prom_getprop(node, "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_printf("SMT: too many threads!\n"
					    "SMT: found %x, max is %x\n",
					    cpu_threads, MAX_CPU_THREADS);
				cpu_threads = 1; /* ToDo: panic? */
			}
		}

		hw_cpu_num = interrupt_server[0];
		if (hw_cpu_num != _prom->cpu) {
			/* Primary Thread of non-boot cpu */
			prom_printf("%x : starting cpu hw idx %x... ", cpuid, reg);
			call_prom("start-cpu", 3, 0, node,
				  secondary_hold, reg);

1269 1270
			for (i = 0; (i < 100000000) && 
			     (*acknowledge == ((unsigned long)-1)); i++ )
1271 1272
				mb();

1273
			if (*acknowledge == reg)
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				prom_printf("done\n");
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			else
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				prom_printf("failed: %x\n", *acknowledge);
		}
#ifdef CONFIG_SMP
		else
			prom_printf("%x : boot cpu     %x\n", cpuid, reg);
#endif /* CONFIG_SMP */
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		/* Reserve cpu #s for secondary threads.   They start later. */
		cpuid += cpu_threads;
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	}
#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_printf("    starting secondary threads\n");

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

			if (i == 0) {
				unsigned long pir = mfspr(SPRN_PIR);
				if (__is_processor(PV_PULSAR)) {
					RELOC(hmt_thread_data)[i].pir = 
						pir & 0x1f;
				} else {
					RELOC(hmt_thread_data)[i].pir = 
						pir & 0x3ff;
				}
			}
		}
	} else {
		prom_printf("Processor is not HMT capable\n");
	}
#endif

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

	prom_debug("prom_hold_cpus: end...\n");
}


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

	/* Get a handle to the prom entry point before anything else */
	RELOC(prom_entry) = pp;

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

	/* get device tree root */
	_prom->root = call_prom("finddevice", 1, 1, ADDR("/"));
	if (!PHANDLE_VALID(_prom->root))
		prom_panic("cannot find device tree root"); /* msg won't be printed :( */
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	_prom->mmumap = 0;
}

#ifdef CONFIG_PPC32
/*
 * For really old powermacs, we need to map things we claim.
 * For that, we need the ihandle of the mmu.
 */
static void __init prom_find_mmu(void)
{
	struct prom_t *_prom = &RELOC(prom);
	phandle oprom;
	char version[64];

	oprom = call_prom("finddevice", 1, 1, ADDR("/openprom"));
	if (!PHANDLE_VALID(oprom))
		return;
	if (prom_getprop(oprom, "model", version, sizeof(version)) <= 0)
		return;
	version[sizeof(version) - 1] = 0;
	prom_printf("OF version is '%s'\n", version);
	/* XXX might need to add other versions here */
	if (strcmp(version, "Open Firmware, 1.0.5") != 0)
		return;
	prom_getprop(_prom->chosen, "mmu", &_prom->mmumap,
		     sizeof(_prom->mmumap));
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}
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#else
#define prom_find_mmu()
#endif
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static void __init prom_init_stdout(void)
{
	struct prom_t *_prom = &RELOC(prom);
	char *path = RELOC(of_stdout_device);
	char type[16];
	u32 val;

	if (prom_getprop(_prom->chosen, "stdout", &val, sizeof(val)) <= 0)
		prom_panic("cannot find stdout");

	_prom->stdout = val;

	/* Get the full OF pathname of the stdout device */
	memset(path, 0, 256);
	call_prom("instance-to-path", 3, 1, _prom->stdout, path, 255);
	val = call_prom("instance-to-package", 1, 1, _prom->stdout);
	prom_setprop(_prom->chosen, "linux,stdout-package", &val, sizeof(val));
	prom_printf("OF stdout device is: %s\n", RELOC(of_stdout_device));
	prom_setprop(_prom->chosen, "linux,stdout-path",
		     RELOC(of_stdout_device), strlen(RELOC(of_stdout_device))+1);

	/* If it's a display, note it */
	memset(type, 0, sizeof(type));
	prom_getprop(val, "device_type", type, sizeof(type));
	if (strcmp(type, RELOC("display")) == 0)
		prom_setprop(val, "linux,boot-display", NULL, 0);
}

static void __init prom_close_stdin(void)
{
	struct prom_t *_prom = &RELOC(prom);
	ihandle val;

	if (prom_getprop(_prom->chosen, "stdin", &val, sizeof(val)) > 0)
		call_prom("close", 1, 0, val);
}

static int __init prom_find_machine_type(void)
{
	struct prom_t *_prom = &RELOC(prom);
	char compat[256];
	int len, i = 0;
	phandle rtas;

	len = prom_getprop(_prom->root, "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")) ||
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			    strstr(p, RELOC("MacRISC")))
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				return PLATFORM_POWERMAC;
#ifdef CONFIG_PPC64
			if (strstr(p, RELOC("Momentum,Maple")))
				return PLATFORM_MAPLE;
#endif
			i += sl + 1;
		}
	}
#ifdef CONFIG_PPC64
	/* Default to pSeries. We need to know if we are running LPAR */
	rtas = call_prom("finddevice", 1, 1, ADDR("/rtas"));
	if (PHANDLE_VALID(rtas)) {
		int x = prom_getproplen(rtas, "ibm,hypertas-functions");
		if (x != PROM_ERROR) {
			prom_printf("Hypertas detected, assuming LPAR !\n");
			return PLATFORM_PSERIES_LPAR;
		}
	}
	return PLATFORM_PSERIES;
#else
	return PLATFORM_CHRP;
#endif
}

static int __init prom_set_color(ihandle ih, int i, int r, int g, int b)
{
	return call_prom("call-method", 6, 1, ADDR("color!"), ih, i, b, g, 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 void __init prom_check_displays(void)
{
	char type[16], *path;
	phandle node;
	ihandle ih;
	int i;

	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_printf("Looking for displays\n");
	for (node = 0; prom_next_node(&node); ) {
		memset(type, 0, sizeof(type));
		prom_getprop(node, "device_type", type, sizeof(type));
		if (strcmp(type, RELOC("display")) != 0)
			continue;

		/* It seems OF doesn't null-terminate the path :-( */
		path = RELOC(prom_scratch);
		memset(path, 0, PROM_SCRATCH_SIZE);

		/*
		 * leave some room at the end of the path for appending extra
		 * arguments
		 */
		if (call_prom("package-to-path", 3, 1, node, path,
			      PROM_SCRATCH_SIZE-10) == PROM_ERROR)
			continue;
		prom_printf("found display   : %s, opening ... ", path);
		
		ih = call_prom("open", 1, 1, path);
		if (ih == 0) {
			prom_printf("failed\n");
			continue;
		}

		/* Success */
		prom_printf("done\n");
		prom_setprop(node, "linux,opened", NULL, 0);

		/* Setup a usable 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 (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;

	*mem_start = _ALIGN(*mem_start, align);
	while ((*mem_start + needed) > *mem_end) {
		unsigned long room, chunk;

		prom_debug("Chunk exhausted, claiming more at %x...\n",
			   RELOC(alloc_bottom));
		room = RELOC(alloc_top) - RELOC(alloc_bottom);
		if (room > DEVTREE_CHUNK_SIZE)
			room = DEVTREE_CHUNK_SIZE;
		if (room < PAGE_SIZE)
			prom_panic("No memory for flatten_device_tree (no room)");
		chunk = alloc_up(room, 0);
		if (chunk == 0)
			prom_panic("No memory for flatten_device_tree (claim failed)");
		*mem_end = RELOC(alloc_top);
	}

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

	return ret;
}

#define dt_push_token(token, mem_start, mem_end) \
	do { *((u32 *)make_room(mem_start, mem_end, 4, 4)) = token; } while(0)

static unsigned long __init dt_find_string(char *str)
{
	char *s, *os;

	s = os = (char *)RELOC(dt_string_start);
	s += 4;
	while (s <  (char *)RELOC(dt_string_end)) {
		if (strcmp(s, str) == 0)
			return s - os;
		s += strlen(s) + 1;
	}
	return 0;
}

/*
 * The Open Firmware 1275 specification states properties must be 31 bytes or
 * less, however not all firmwares obey this. Make it 64 bytes to be safe.
 */
#define MAX_PROPERTY_NAME 64

static void __init scan_dt_build_strings(phandle node,
					 unsigned long *mem_start,
					 unsigned long *mem_end)
{
	char *prev_name, *namep, *sstart;
	unsigned long soff;
	phandle child;

	sstart =  (char *)RELOC(dt_string_start);

	/* get and store all property names */
	prev_name = RELOC("");
	for (;;) {
		/* 64 is max len of name including nul. */
		namep = make_room(mem_start, mem_end, MAX_PROPERTY_NAME, 1);
		if (call_prom("nextprop", 3, 1, node, prev_name, namep) != 1) {
			/* No more nodes: unwind alloc */
			*mem_start = (unsigned long)namep;
			break;
		}

 		/* skip "name" */
 		if (strcmp(namep, RELOC("name")) == 0) {
 			*mem_start = (unsigned long)namep;
 			prev_name = RELOC("name");
 			continue;
 		}
		/* get/create string entry */
		soff = dt_find_string(namep);
		if (soff != 0) {
			*mem_start = (unsigned long)namep;
			namep = sstart + soff;
		} else {
			/* Trim off some if we can */
			*mem_start = (unsigned long)namep + strlen(namep) + 1;
			RELOC(dt_string_end) = *mem_start;
		}
		prev_name = namep;
	}

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

static void __init scan_dt_build_struct(phandle node, unsigned long *mem_start,
					unsigned long *mem_end)
{
	phandle child;
	char *namep, *prev_name, *sstart, *p, *ep, *lp, *path;
	unsigned long soff;
	unsigned char *valp;
	static char pname[MAX_PROPERTY_NAME];
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	int l, room;
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	dt_push_token(OF_DT_BEGIN_NODE, mem_start, mem_end);

	/* get the node's full name */
	namep = (char *)*mem_start;
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	room = *mem_end - *mem_start;
	if (room > 255)
		room = 255;
	l = call_prom("package-to-path", 3, 1, node, namep, room);
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	if (l >= 0) {
		/* Didn't fit?  Get more room. */
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		if (l >= room) {
			if (l >= *mem_end - *mem_start)
				namep = make_room(mem_start, mem_end, l+1, 1);
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			call_prom("package-to-path", 3, 1, node, namep, l);
		}
		namep[l] = '\0';

		/* Fixup an Apple bug where they have bogus \0 chars in the
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		 * middle of the path in some properties, and extract
		 * the unit name (everything after the last '/').
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		 */
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		for (lp = p = namep, ep = namep + l; p < ep; p++) {
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			if (*p == '/')
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				lp = namep;
			else if (*p != 0)
				*lp++ = *p;
		}
		*lp = 0;
		*mem_start = _ALIGN((unsigned long)lp + 1, 4);
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	}

	/* get it again for debugging */
	path = RELOC(prom_scratch);
	memset(path, 0, PROM_SCRATCH_SIZE);
	call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);

	/* get and store all properties */
	prev_name = RELOC("");
	sstart = (char *)RELOC(dt_string_start);
	for (;;) {
		if (call_prom("nextprop", 3, 1, node, prev_name,
			      RELOC(pname)) != 1)
			break;

 		/* skip "name" */
 		if (strcmp(RELOC(pname), RELOC("name")) == 0) {
 			prev_name = RELOC("name");
 			continue;
 		}

		/* find string offset */
		soff = dt_find_string(RELOC(pname));
		if (soff == 0) {
			prom_printf("WARNING: Can't find string index for"
				    " <%s>, node %s\n", RELOC(pname), path);
			break;
		}
		prev_name = sstart + soff;

		/* get length */
		l = call_prom("getproplen", 2, 1, node, RELOC(pname));

		/* sanity checks */
		if (l == PROM_ERROR)
			continue;
		if (l > MAX_PROPERTY_LENGTH) {
			prom_printf("WARNING: ignoring large property ");
			/* It seems OF doesn't null-terminate the path :-( */
			prom_printf("[%s] ", path);
			prom_printf("%s length 0x%x\n", RELOC(pname), l);
			continue;
		}

		/* push property head */
		dt_push_token(OF_DT_PROP, mem_start, mem_end);
		dt_push_token(l, mem_start, mem_end);
		dt_push_token(soff, mem_start, mem_end);

		/* push property content */
		valp = make_room(mem_start, mem_end, l, 4);
		call_prom("getprop", 4, 1, node, RELOC(pname), valp, l);
		*mem_start = _ALIGN(*mem_start, 4);
	}

	/* Add a "linux,phandle" property. */
	soff = dt_find_string(RELOC("linux,phandle"));
	if (soff == 0)
		prom_printf("WARNING: Can't find string index for"
			    " <linux-phandle> node %s\n", path);
	else {
		dt_push_token(OF_DT_PROP, mem_start, mem_end);
		dt_push_token(4, mem_start, mem_end);
		dt_push_token(soff, mem_start, mem_end);
		valp = make_room(mem_start, mem_end, 4, 4);
		*(u32 *)valp = node;
	}

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

	dt_push_token(OF_DT_END_NODE, mem_start, mem_end);
}

static void __init flatten_device_tree(void)
{
	phandle root;
	unsigned long mem_start, mem_end, room;
	struct boot_param_header *hdr;
	struct prom_t *_prom = &RELOC(prom);
	char *namep;
	u64 *rsvmap;

	/*
	 * Check how much room we have between alloc top & bottom (+/- a
	 * few pages), crop to 4Mb, as this is our "chuck" size
	 */
	room = RELOC(alloc_top) - RELOC(alloc_bottom) - 0x4000;
	if (room > DEVTREE_CHUNK_SIZE)
		room = DEVTREE_CHUNK_SIZE;
	prom_debug("starting device tree allocs at %x\n", RELOC(alloc_bottom));

	/* Now try to claim that */
	mem_start = (unsigned long)alloc_up(room, PAGE_SIZE);
	if (mem_start == 0)
		prom_panic("Can't allocate initial device-tree chunk\n");
	mem_end = RELOC(alloc_top);

	/* Get root of tree */
	root = call_prom("peer", 1, 1, (phandle)0);
	if (root == (phandle)0)
		prom_panic ("couldn't get device tree root\n");

	/* Build header and make room for mem rsv map */ 
	mem_start = _ALIGN(mem_start, 4);
	hdr = make_room(&mem_start, &mem_end,
			sizeof(struct boot_param_header), 4);
	RELOC(dt_header_start) = (unsigned long)hdr;
	rsvmap = make_room(&mem_start, &mem_end, sizeof(mem_reserve_map), 8);

	/* Start of strings */
	mem_start = PAGE_ALIGN(mem_start);
	RELOC(dt_string_start) = mem_start;
	mem_start += 4; /* hole */

	/* Add "linux,phandle" in there, we'll need it */
	namep = make_room(&mem_start, &mem_end, 16, 1);
	strcpy(namep, RELOC("linux,phandle"));
	mem_start = (unsigned long)namep + strlen(namep) + 1;

	/* Build string array */
	prom_printf("Building dt strings...\n"); 
	scan_dt_build_strings(root, &mem_start, &mem_end);
	RELOC(dt_string_end) = mem_start;

	/* Build structure */
	mem_start = PAGE_ALIGN(mem_start);
	RELOC(dt_struct_start) = mem_start;
	prom_printf("Building dt structure...\n"); 
	scan_dt_build_struct(root, &mem_start, &mem_end);
	dt_push_token(OF_DT_END, &mem_start, &mem_end);
	RELOC(dt_struct_end) = PAGE_ALIGN(mem_start);

	/* Finish header */
	hdr->boot_cpuid_phys = _prom->cpu;
	hdr->magic = OF_DT_HEADER;
	hdr->totalsize = RELOC(dt_struct_end) - RELOC(dt_header_start);
	hdr->off_dt_struct = RELOC(dt_struct_start) - RELOC(dt_header_start);
	hdr->off_dt_strings = RELOC(dt_string_start) - RELOC(dt_header_start);
	hdr->dt_strings_size = RELOC(dt_string_end) - RELOC(dt_string_start);
	hdr->off_mem_rsvmap = ((unsigned long)rsvmap) - RELOC(dt_header_start);
	hdr->version = OF_DT_VERSION;
	/* Version 16 is not backward compatible */
	hdr->last_comp_version = 0x10;

	/* Reserve the whole thing and copy the reserve map in, we
	 * also bump mem_reserve_cnt to cause further reservations to
	 * fail since it's too late.
	 */
	reserve_mem(RELOC(dt_header_start), hdr->totalsize);
	memcpy(rsvmap, RELOC(mem_reserve_map), sizeof(mem_reserve_map));

#ifdef DEBUG_PROM
	{
		int i;
		prom_printf("reserved memory map:\n");
		for (i = 0; i < RELOC(mem_reserve_cnt); i++)
			prom_printf("  %x - %x\n",
				    RELOC(mem_reserve_map)[i].base,
				    RELOC(mem_reserve_map)[i].size);
	}
#endif
	RELOC(mem_reserve_cnt) = MEM_RESERVE_MAP_SIZE;

	prom_printf("Device tree strings 0x%x -> 0x%x\n",
		    RELOC(dt_string_start), RELOC(dt_string_end)); 
	prom_printf("Device tree struct  0x%x -> 0x%x\n",
		    RELOC(dt_struct_start), RELOC(dt_struct_end));

}


static void __init fixup_device_tree(void)
{
#if defined(CONFIG_PPC64) && defined(CONFIG_PPC_PMAC)
	phandle u3, i2c, mpic;
	u32 u3_rev;
	u32 interrupts[2];
	u32 parent;

	/* Some G5s have a missing interrupt definition, fix it up here */
	u3 = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000"));
	if (!PHANDLE_VALID(u3))
		return;
	i2c = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/i2c@f8001000"));
	if (!PHANDLE_VALID(i2c))
		return;
	mpic = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/mpic@f8040000"));
	if (!PHANDLE_VALID(mpic))
		return;

	/* check if proper rev of u3 */
	if (prom_getprop(u3, "device-rev", &u3_rev, sizeof(u3_rev))
	    == PROM_ERROR)
		return;
	if (u3_rev != 0x35 && u3_rev != 0x37)
		return;
	/* does it need fixup ? */
	if (prom_getproplen(i2c, "interrupts") > 0)
		return;

	prom_printf("fixing up bogus interrupts for u3 i2c...\n");

	/* interrupt on this revision of u3 is number 0 and level */
	interrupts[0] = 0;
	interrupts[1] = 1;
	prom_setprop(i2c, "interrupts", &interrupts, sizeof(interrupts));
	parent = (u32)mpic;
	prom_setprop(i2c, "interrupt-parent", &parent, sizeof(parent));
#endif
}


static void __init prom_find_boot_cpu(void)
{
       	struct prom_t *_prom = &RELOC(prom);
	u32 getprop_rval;
	ihandle prom_cpu;
	phandle cpu_pkg;

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	_prom->cpu = 0;
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	if (prom_getprop(_prom->chosen, "cpu", &prom_cpu, sizeof(prom_cpu)) <= 0)
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		return;
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	cpu_pkg = call_prom("instance-to-package", 1, 1, prom_cpu);

	prom_getprop(cpu_pkg, "reg", &getprop_rval, sizeof(getprop_rval));
	_prom->cpu = getprop_rval;

	prom_debug("Booting CPU hw index = 0x%x\n", _prom->cpu);
}

static void __init prom_check_initrd(unsigned long r3, unsigned long r4)
{
#ifdef CONFIG_BLK_DEV_INITRD
       	struct prom_t *_prom = &RELOC(prom);

	if (r3 && r4 && r4 != 0xdeadbeef) {
		unsigned long val;

		RELOC(prom_initrd_start) = (r3 >= KERNELBASE) ? __pa(r3) : r3;
		RELOC(prom_initrd_end) = RELOC(prom_initrd_start) + r4;

		val = RELOC(prom_initrd_start);
		prom_setprop(_prom->chosen, "linux,initrd-start", &val,
			     sizeof(val));
		val = RELOC(prom_initrd_end);
		prom_setprop(_prom->chosen, "linux,initrd-end", &val,
			     sizeof(val));

		reserve_mem(RELOC(prom_initrd_start),
			    RELOC(prom_initrd_end) - RELOC(prom_initrd_start));

		prom_debug("initrd_start=0x%x\n", RELOC(prom_initrd_start));
		prom_debug("initrd_end=0x%x\n", RELOC(prom_initrd_end));
	}
#endif /* CONFIG_BLK_DEV_INITRD */
}

/*
 * 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)
{	
       	struct prom_t *_prom;
	unsigned long hdr;
	u32 getprop_rval;
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	unsigned long offset = reloc_offset();
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#ifdef CONFIG_PPC32
	reloc_got2(offset);
#endif

	_prom = &RELOC(prom);

	/*
	 * First zero the BSS
	 */
	memset(&RELOC(__bss_start), 0, __bss_stop - __bss_start);

	/*
	 * Init interface to Open Firmware, get some node references,
	 * like /chosen
	 */
	prom_init_client_services(pp);

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

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	/*
	 * See if this OF is old enough that we need to do explicit maps
	 */
	prom_find_mmu();

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	/*
	 * Check for an initrd
	 */
	prom_check_initrd(r3, r4);

	/*
	 * Get default machine type. At this point, we do not differentiate
	 * between pSeries SMP and pSeries LPAR
	 */
	RELOC(of_platform) = prom_find_machine_type();
	getprop_rval = RELOC(of_platform);
	prom_setprop(_prom->chosen, "linux,platform",
		     &getprop_rval, sizeof(getprop_rval));

#ifdef CONFIG_PPC_PSERIES
	/*
	 * On pSeries, inform the firmware about our capabilities
	 */
	if (RELOC(of_platform) & PLATFORM_PSERIES)
		prom_send_capabilities();
#endif

	/*
	 * On pSeries and BPA, copy the CPU hold code
	 */
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       	if (RELOC(of_platform) != PLATFORM_POWERMAC)
2006
       		copy_and_flush(0, KERNELBASE + offset, 0x100, 0);
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	/*
	 * Do early parsing of command line
	 */
	early_cmdline_parse();

	/*
	 * Initialize memory management within prom_init
	 */
	prom_init_mem();

	/*
	 * Determine which cpu is actually running right _now_
	 */
	prom_find_boot_cpu();

	/* 
	 * Initialize display devices
	 */
	prom_check_displays();

#ifdef CONFIG_PPC64
	/*
	 * Initialize IOMMU (TCE tables) on pSeries. Do that before anything else
	 * that uses the allocator, we need to make sure we get the top of memory
	 * available for us here...
	 */
	if (RELOC(of_platform) == PLATFORM_PSERIES)
		prom_initialize_tce_table();
#endif

	/*
	 * On non-powermacs, try to instantiate RTAS and puts all CPUs
	 * in spin-loops. PowerMacs don't have a working RTAS and use
	 * a different way to spin CPUs
	 */
	if (RELOC(of_platform) != PLATFORM_POWERMAC) {
		prom_instantiate_rtas();
		prom_hold_cpus();
	}

	/*
	 * Fill in some infos for use by the kernel later on
	 */
	if (RELOC(prom_memory_limit))
		prom_setprop(_prom->chosen, "linux,memory-limit",
			     &RELOC(prom_memory_limit),
			     sizeof(prom_memory_limit));
#ifdef CONFIG_PPC64
	if (RELOC(ppc64_iommu_off))
		prom_setprop(_prom->chosen, "linux,iommu-off", NULL, 0);

	if (RELOC(iommu_force_on))
		prom_setprop(_prom->chosen, "linux,iommu-force-on", NULL, 0);

	if (RELOC(prom_tce_alloc_start)) {
		prom_setprop(_prom->chosen, "linux,tce-alloc-start",
			     &RELOC(prom_tce_alloc_start),
			     sizeof(prom_tce_alloc_start));
		prom_setprop(_prom->chosen, "linux,tce-alloc-end",
			     &RELOC(prom_tce_alloc_end),
			     sizeof(prom_tce_alloc_end));
	}
#endif

	/*
	 * Fixup any known bugs in the device-tree
	 */
	fixup_device_tree();

	/*
	 * Now finally create the flattened device-tree
	 */
	prom_printf("copying OF device tree ...\n");
	flatten_device_tree();

	/* in case stdin is USB and still active on IBM machines... */
	prom_close_stdin();

	/*
	 * Call OF "quiesce" method to shut down pending DMA's from
	 * devices etc...
	 */
	prom_printf("Calling quiesce ...\n");
	call_prom("quiesce", 0, 0);

	/*
	 * And finally, call the kernel passing it the flattened device
	 * tree and NULL as r5, thus triggering the new entry point which
	 * is common to us and kexec
	 */
	hdr = RELOC(dt_header_start);
	prom_printf("returning from prom_init\n");
	prom_debug("->dt_header_start=0x%x\n", hdr);

#ifdef CONFIG_PPC32
	reloc_got2(-offset);
#endif

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	__start(hdr, KERNELBASE + offset, 0);
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	return 0;
}