Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 3493 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
new file mode 100644
index 000000000..d464ba412
--- /dev/null
+++ b/arch/powerpc/kernel/prom_init.c
@@ -0,0 +1,3493 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * 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 
+ */
+
+#undef DEBUG_PROM
+
+/* we cannot use FORTIFY as it brings in new symbols */
+#define __NO_FORTIFY
+
+#include <linux/stdarg.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/delay.h>
+#include <linux/initrd.h>
+#include <linux/bitops.h>
+#include <linux/pgtable.h>
+#include <linux/printk.h>
+#include <linux/of.h>
+#include <linux/of_fdt.h>
+#include <asm/prom.h>
+#include <asm/rtas.h>
+#include <asm/page.h>
+#include <asm/processor.h>
+#include <asm/interrupt.h>
+#include <asm/irq.h>
+#include <asm/io.h>
+#include <asm/smp.h>
+#include <asm/mmu.h>
+#include <asm/iommu.h>
+#include <asm/btext.h>
+#include <asm/sections.h>
+#include <asm/setup.h>
+#include <asm/asm-prototypes.h>
+#include <asm/ultravisor-api.h>
+
+#include <linux/linux_logo.h>
+
+/* All of prom_init bss lives here */
+#define __prombss __section(".bss.prominit")
+
+/*
+ * 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.
+ * ppc64 objects are always relocatable, we just need to relocate the
+ * TOC.
+ *
+ * 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).
+ */
+#define ADDR(x)		(u32)(unsigned long)(x)
+
+#ifdef CONFIG_PPC64
+#define OF_WORKAROUNDS	0
+#else
+#define OF_WORKAROUNDS	of_workarounds
+static int of_workarounds __prombss;
+#endif
+
+#define OF_WA_CLAIM	1	/* do phys/virt claim separately, then map */
+#define OF_WA_LONGTRAIL	2	/* work around longtrail bugs */
+
+#ifdef DEBUG_PROM
+#define prom_debug(x...)	prom_printf(x)
+#else
+#define prom_debug(x...)	do { } while (0)
+#endif
+
+
+typedef u32 prom_arg_t;
+
+struct prom_args {
+        __be32 service;
+        __be32 nargs;
+        __be32 nret;
+        __be32 args[10];
+};
+
+struct prom_t {
+	ihandle root;
+	phandle chosen;
+	int cpu;
+	ihandle stdout;
+	ihandle mmumap;
+	ihandle memory;
+};
+
+struct mem_map_entry {
+	__be64	base;
+	__be64	size;
+};
+
+typedef __be32 cell_t;
+
+extern void __start(unsigned long r3, unsigned long r4, unsigned long r5,
+		    unsigned long r6, unsigned long r7, unsigned long r8,
+		    unsigned long r9);
+
+#ifdef CONFIG_PPC64
+extern int enter_prom(struct prom_args *args, unsigned long entry);
+#else
+static inline int enter_prom(struct prom_args *args, unsigned long entry)
+{
+	return ((int (*)(struct prom_args *))entry)(args);
+}
+#endif
+
+extern void copy_and_flush(unsigned long dest, unsigned long src,
+			   unsigned long size, unsigned long offset);
+
+/* prom structure */
+static struct prom_t __prombss prom;
+
+static unsigned long __prombss prom_entry;
+
+static char __prombss of_stdout_device[256];
+static char __prombss prom_scratch[256];
+
+static unsigned long __prombss dt_header_start;
+static unsigned long __prombss dt_struct_start, dt_struct_end;
+static unsigned long __prombss dt_string_start, dt_string_end;
+
+static unsigned long __prombss prom_initrd_start, prom_initrd_end;
+
+#ifdef CONFIG_PPC64
+static int __prombss prom_iommu_force_on;
+static int __prombss prom_iommu_off;
+static unsigned long __prombss prom_tce_alloc_start;
+static unsigned long __prombss prom_tce_alloc_end;
+#endif
+
+#ifdef CONFIG_PPC_PSERIES
+static bool __prombss prom_radix_disable;
+static bool __prombss prom_radix_gtse_disable;
+static bool __prombss prom_xive_disable;
+#endif
+
+#ifdef CONFIG_PPC_SVM
+static bool __prombss prom_svm_enable;
+#endif
+
+struct platform_support {
+	bool hash_mmu;
+	bool radix_mmu;
+	bool radix_gtse;
+	bool xive;
+};
+
+/* Platforms codes are now obsolete in the kernel. Now only used within this
+ * file and ultimately gone too. Feel free to change them if you need, they
+ * are not shared with anything outside of this file anymore
+ */
+#define PLATFORM_PSERIES	0x0100
+#define PLATFORM_PSERIES_LPAR	0x0101
+#define PLATFORM_LPAR		0x0001
+#define PLATFORM_POWERMAC	0x0400
+#define PLATFORM_GENERIC	0x0500
+
+static int __prombss of_platform;
+
+static char __prombss prom_cmd_line[COMMAND_LINE_SIZE];
+
+static unsigned long __prombss prom_memory_limit;
+
+static unsigned long __prombss alloc_top;
+static unsigned long __prombss alloc_top_high;
+static unsigned long __prombss alloc_bottom;
+static unsigned long __prombss rmo_top;
+static unsigned long __prombss ram_top;
+
+static struct mem_map_entry __prombss mem_reserve_map[MEM_RESERVE_MAP_SIZE];
+static int __prombss mem_reserve_cnt;
+
+static cell_t __prombss regbuf[1024];
+
+static bool  __prombss rtas_has_query_cpu_stopped;
+
+
+/*
+ * 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)
+
+/* Copied from lib/string.c and lib/kstrtox.c */
+
+static int __init prom_strcmp(const char *cs, const char *ct)
+{
+	unsigned char c1, c2;
+
+	while (1) {
+		c1 = *cs++;
+		c2 = *ct++;
+		if (c1 != c2)
+			return c1 < c2 ? -1 : 1;
+		if (!c1)
+			break;
+	}
+	return 0;
+}
+
+static ssize_t __init prom_strscpy_pad(char *dest, const char *src, size_t n)
+{
+	ssize_t rc;
+	size_t i;
+
+	if (n == 0 || n > INT_MAX)
+		return -E2BIG;
+
+	// Copy up to n bytes
+	for (i = 0; i < n && src[i] != '\0'; i++)
+		dest[i] = src[i];
+
+	rc = i;
+
+	// If we copied all n then we have run out of space for the nul
+	if (rc == n) {
+		// Rewind by one character to ensure nul termination
+		i--;
+		rc = -E2BIG;
+	}
+
+	for (; i < n; i++)
+		dest[i] = '\0';
+
+	return rc;
+}
+
+static int __init prom_strncmp(const char *cs, const char *ct, size_t count)
+{
+	unsigned char c1, c2;
+
+	while (count) {
+		c1 = *cs++;
+		c2 = *ct++;
+		if (c1 != c2)
+			return c1 < c2 ? -1 : 1;
+		if (!c1)
+			break;
+		count--;
+	}
+	return 0;
+}
+
+static size_t __init prom_strlen(const char *s)
+{
+	const char *sc;
+
+	for (sc = s; *sc != '\0'; ++sc)
+		/* nothing */;
+	return sc - s;
+}
+
+static int __init prom_memcmp(const void *cs, const void *ct, size_t count)
+{
+	const unsigned char *su1, *su2;
+	int res = 0;
+
+	for (su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)
+		if ((res = *su1 - *su2) != 0)
+			break;
+	return res;
+}
+
+static char __init *prom_strstr(const char *s1, const char *s2)
+{
+	size_t l1, l2;
+
+	l2 = prom_strlen(s2);
+	if (!l2)
+		return (char *)s1;
+	l1 = prom_strlen(s1);
+	while (l1 >= l2) {
+		l1--;
+		if (!prom_memcmp(s1, s2, l2))
+			return (char *)s1;
+		s1++;
+	}
+	return NULL;
+}
+
+static size_t __init prom_strlcat(char *dest, const char *src, size_t count)
+{
+	size_t dsize = prom_strlen(dest);
+	size_t len = prom_strlen(src);
+	size_t res = dsize + len;
+
+	/* This would be a bug */
+	if (dsize >= count)
+		return count;
+
+	dest += dsize;
+	count -= dsize;
+	if (len >= count)
+		len = count-1;
+	memcpy(dest, src, len);
+	dest[len] = 0;
+	return res;
+
+}
+
+#ifdef CONFIG_PPC_PSERIES
+static int __init prom_strtobool(const char *s, bool *res)
+{
+	if (!s)
+		return -EINVAL;
+
+	switch (s[0]) {
+	case 'y':
+	case 'Y':
+	case '1':
+		*res = true;
+		return 0;
+	case 'n':
+	case 'N':
+	case '0':
+		*res = false;
+		return 0;
+	case 'o':
+	case 'O':
+		switch (s[1]) {
+		case 'n':
+		case 'N':
+			*res = true;
+			return 0;
+		case 'f':
+		case 'F':
+			*res = false;
+			return 0;
+		default:
+			break;
+		}
+		break;
+	default:
+		break;
+	}
+
+	return -EINVAL;
+}
+#endif
+
+/* 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 = cpu_to_be32(ADDR(service));
+	args.nargs = cpu_to_be32(nargs);
+	args.nret = cpu_to_be32(nret);
+
+	va_start(list, nret);
+	for (i = 0; i < nargs; i++)
+		args.args[i] = cpu_to_be32(va_arg(list, prom_arg_t));
+	va_end(list);
+
+	for (i = 0; i < nret; i++)
+		args.args[nargs+i] = 0;
+
+	if (enter_prom(&args, prom_entry) < 0)
+		return PROM_ERROR;
+
+	return (nret > 0) ? be32_to_cpu(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 = cpu_to_be32(ADDR(service));
+	args.nargs = cpu_to_be32(nargs);
+	args.nret = cpu_to_be32(nret);
+
+	va_start(list, rets);
+	for (i = 0; i < nargs; i++)
+		args.args[i] = cpu_to_be32(va_arg(list, prom_arg_t));
+	va_end(list);
+
+	for (i = 0; i < nret; i++)
+		args.args[nargs+i] = 0;
+
+	if (enter_prom(&args, prom_entry) < 0)
+		return PROM_ERROR;
+
+	if (rets != NULL)
+		for (i = 1; i < nret; ++i)
+			rets[i-1] = be32_to_cpu(args.args[nargs+i]);
+
+	return (nret > 0) ? be32_to_cpu(args.args[nargs]) : 0;
+}
+
+
+static void __init prom_print(const char *msg)
+{
+	const char *p, *q;
+
+	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);
+	}
+}
+
+
+/*
+ * Both prom_print_hex & prom_print_dec takes an unsigned long as input so that
+ * we do not need __udivdi3 or __umoddi3 on 32bits.
+ */
+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';
+	call_prom("write", 3, 1, prom.stdout, buf, nibbles);
+}
+
+/* max number of decimal digits in an unsigned long */
+#define UL_DIGITS 21
+static void __init prom_print_dec(unsigned long val)
+{
+	int i, size;
+	char buf[UL_DIGITS+1];
+
+	for (i = UL_DIGITS-1; i >= 0;  i--) {
+		buf[i] = (val % 10) + '0';
+		val = val/10;
+		if (val == 0)
+			break;
+	}
+	/* shift stuff down */
+	size = UL_DIGITS - i;
+	call_prom("write", 3, 1, prom.stdout, buf+i, size);
+}
+
+__printf(1, 2)
+static void __init prom_printf(const char *format, ...)
+{
+	const char *p, *q, *s;
+	va_list args;
+	unsigned long v;
+	long vs;
+	int n = 0;
+
+	va_start(args, format);
+	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;
+		while (*q == 'l') {
+			++q;
+			++n;
+		}
+		switch (*q) {
+		case 's':
+			++q;
+			s = va_arg(args, const char *);
+			prom_print(s);
+			break;
+		case 'x':
+			++q;
+			switch (n) {
+			case 0:
+				v = va_arg(args, unsigned int);
+				break;
+			case 1:
+				v = va_arg(args, unsigned long);
+				break;
+			case 2:
+			default:
+				v = va_arg(args, unsigned long long);
+				break;
+			}
+			prom_print_hex(v);
+			break;
+		case 'u':
+			++q;
+			switch (n) {
+			case 0:
+				v = va_arg(args, unsigned int);
+				break;
+			case 1:
+				v = va_arg(args, unsigned long);
+				break;
+			case 2:
+			default:
+				v = va_arg(args, unsigned long long);
+				break;
+			}
+			prom_print_dec(v);
+			break;
+		case 'd':
+			++q;
+			switch (n) {
+			case 0:
+				vs = va_arg(args, int);
+				break;
+			case 1:
+				vs = va_arg(args, long);
+				break;
+			case 2:
+			default:
+				vs = va_arg(args, long long);
+				break;
+			}
+			if (vs < 0) {
+				prom_print("-");
+				vs = -vs;
+			}
+			prom_print_dec(vs);
+			break;
+		}
+	}
+	va_end(args);
+}
+
+
+static unsigned int __init prom_claim(unsigned long virt, unsigned long size,
+				unsigned long align)
+{
+
+	if (align == 0 && (OF_WORKAROUNDS & OF_WA_CLAIM)) {
+		/*
+		 * Old OF requires we claim physical and virtual separately
+		 * and then map explicitly (assuming virtual mode)
+		 */
+		int ret;
+		prom_arg_t result;
+
+		ret = call_prom_ret("call-method", 5, 2, &result,
+				    ADDR("claim"), prom.memory,
+				    align, size, virt);
+		if (ret != 0 || result == -1)
+			return -1;
+		ret = call_prom_ret("call-method", 5, 2, &result,
+				    ADDR("claim"), prom.mmumap,
+				    align, size, virt);
+		if (ret != 0) {
+			call_prom("call-method", 4, 1, ADDR("release"),
+				  prom.memory, size, virt);
+			return -1;
+		}
+		/* the 0x12 is M (coherence) + PP == read/write */
+		call_prom("call-method", 6, 1,
+			  ADDR("map"), prom.mmumap, 0x12, size, virt, virt);
+		return virt;
+	}
+	return call_prom("claim", 3, 1, (prom_arg_t)virt, (prom_arg_t)size,
+			 (prom_arg_t)align);
+}
+
+static void __init __attribute__((noreturn)) prom_panic(const char *reason)
+{
+	prom_print(reason);
+	/* Do not call exit because it clears the screen on pmac
+	 * it also causes some sort of double-fault on early pmacs */
+	if (of_platform == PLATFORM_POWERMAC)
+		asm("trap\n");
+
+	/* ToDo: should put up an SRC here on pSeries */
+	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 inline 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 inline int __init prom_getproplen(phandle node, const char *pname)
+{
+	return call_prom("getproplen", 2, 1, node, ADDR(pname));
+}
+
+static void __init add_string(char **str, const char *q)
+{
+	char *p = *str;
+
+	while (*q)
+		*p++ = *q++;
+	*p++ = ' ';
+	*str = p;
+}
+
+static char *__init tohex(unsigned int x)
+{
+	static const char digits[] __initconst = "0123456789abcdef";
+	static char result[9] __prombss;
+	int i;
+
+	result[8] = 0;
+	i = 8;
+	do {
+		--i;
+		result[i] = digits[x & 0xf];
+		x >>= 4;
+	} while (x != 0 && i > 0);
+	return &result[i];
+}
+
+static int __init prom_setprop(phandle node, const char *nodename,
+			       const char *pname, void *value, size_t valuelen)
+{
+	char cmd[256], *p;
+
+	if (!(OF_WORKAROUNDS & OF_WA_LONGTRAIL))
+		return call_prom("setprop", 4, 1, node, ADDR(pname),
+				 (u32)(unsigned long) value, (u32) valuelen);
+
+	/* gah... setprop doesn't work on longtrail, have to use interpret */
+	p = cmd;
+	add_string(&p, "dev");
+	add_string(&p, nodename);
+	add_string(&p, tohex((u32)(unsigned long) value));
+	add_string(&p, tohex(valuelen));
+	add_string(&p, tohex(ADDR(pname)));
+	add_string(&p, tohex(prom_strlen(pname)));
+	add_string(&p, "property");
+	*p = 0;
+	return call_prom("interpret", 1, 1, (u32)(unsigned long) cmd);
+}
+
+/* We can't use the standard versions because of relocation headaches. */
+#define prom_isxdigit(c) \
+	(('0' <= (c) && (c) <= '9') || ('a' <= (c) && (c) <= 'f') || ('A' <= (c) && (c) <= 'F'))
+
+#define prom_isdigit(c)	('0' <= (c) && (c) <= '9')
+#define prom_islower(c)	('a' <= (c) && (c) <= 'z')
+#define prom_toupper(c)	(prom_islower(c) ? ((c) - 'a' + 'A') : (c))
+
+static unsigned long __init prom_strtoul(const char *cp, const char **endp)
+{
+	unsigned long result = 0, base = 10, value;
+
+	if (*cp == '0') {
+		base = 8;
+		cp++;
+		if (prom_toupper(*cp) == 'X') {
+			cp++;
+			base = 16;
+		}
+	}
+
+	while (prom_isxdigit(*cp) &&
+	       (value = prom_isdigit(*cp) ? *cp - '0' : prom_toupper(*cp) - 'A' + 10) < base) {
+		result = result * base + value;
+		cp++;
+	}
+
+	if (endp)
+		*endp = cp;
+
+	return result;
+}
+
+static unsigned long __init 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)
+{
+	const char *opt;
+
+	char *p;
+	int l = 0;
+
+	prom_cmd_line[0] = 0;
+	p = prom_cmd_line;
+
+	if (!IS_ENABLED(CONFIG_CMDLINE_FORCE) && (long)prom.chosen > 0)
+		l = prom_getprop(prom.chosen, "bootargs", p, COMMAND_LINE_SIZE-1);
+
+	if (IS_ENABLED(CONFIG_CMDLINE_EXTEND) || l <= 0 || p[0] == '\0')
+		prom_strlcat(prom_cmd_line, " " CONFIG_CMDLINE,
+			     sizeof(prom_cmd_line));
+
+	prom_printf("command line: %s\n", prom_cmd_line);
+
+#ifdef CONFIG_PPC64
+	opt = prom_strstr(prom_cmd_line, "iommu=");
+	if (opt) {
+		prom_printf("iommu opt is: %s\n", opt);
+		opt += 6;
+		while (*opt && *opt == ' ')
+			opt++;
+		if (!prom_strncmp(opt, "off", 3))
+			prom_iommu_off = 1;
+		else if (!prom_strncmp(opt, "force", 5))
+			prom_iommu_force_on = 1;
+	}
+#endif
+	opt = prom_strstr(prom_cmd_line, "mem=");
+	if (opt) {
+		opt += 4;
+		prom_memory_limit = prom_memparse(opt, (const char **)&opt);
+#ifdef CONFIG_PPC64
+		/* Align to 16 MB == size of ppc64 large page */
+		prom_memory_limit = ALIGN(prom_memory_limit, 0x1000000);
+#endif
+	}
+
+#ifdef CONFIG_PPC_PSERIES
+	prom_radix_disable = !IS_ENABLED(CONFIG_PPC_RADIX_MMU_DEFAULT);
+	opt = prom_strstr(prom_cmd_line, "disable_radix");
+	if (opt) {
+		opt += 13;
+		if (*opt && *opt == '=') {
+			bool val;
+
+			if (prom_strtobool(++opt, &val))
+				prom_radix_disable = false;
+			else
+				prom_radix_disable = val;
+		} else
+			prom_radix_disable = true;
+	}
+	if (prom_radix_disable)
+		prom_debug("Radix disabled from cmdline\n");
+
+	opt = prom_strstr(prom_cmd_line, "radix_hcall_invalidate=on");
+	if (opt) {
+		prom_radix_gtse_disable = true;
+		prom_debug("Radix GTSE disabled from cmdline\n");
+	}
+
+	opt = prom_strstr(prom_cmd_line, "xive=off");
+	if (opt) {
+		prom_xive_disable = true;
+		prom_debug("XIVE disabled from cmdline\n");
+	}
+#endif /* CONFIG_PPC_PSERIES */
+
+#ifdef CONFIG_PPC_SVM
+	opt = prom_strstr(prom_cmd_line, "svm=");
+	if (opt) {
+		bool val;
+
+		opt += sizeof("svm=") - 1;
+		if (!prom_strtobool(opt, &val))
+			prom_svm_enable = val;
+	}
+#endif /* CONFIG_PPC_SVM */
+}
+
+#ifdef CONFIG_PPC_PSERIES
+/*
+ * The architecture vector has an array of PVR mask/value pairs,
+ * followed by # option vectors - 1, followed by the option vectors.
+ *
+ * See prom.h for the definition of the bits specified in the
+ * architecture vector.
+ */
+
+/* Firmware expects the value to be n - 1, where n is the # of vectors */
+#define NUM_VECTORS(n)		((n) - 1)
+
+/*
+ * Firmware expects 1 + n - 2, where n is the length of the option vector in
+ * bytes. The 1 accounts for the length byte itself, the - 2 .. ?
+ */
+#define VECTOR_LENGTH(n)	(1 + (n) - 2)
+
+struct option_vector1 {
+	u8 byte1;
+	u8 arch_versions;
+	u8 arch_versions3;
+} __packed;
+
+struct option_vector2 {
+	u8 byte1;
+	__be16 reserved;
+	__be32 real_base;
+	__be32 real_size;
+	__be32 virt_base;
+	__be32 virt_size;
+	__be32 load_base;
+	__be32 min_rma;
+	__be32 min_load;
+	u8 min_rma_percent;
+	u8 max_pft_size;
+} __packed;
+
+struct option_vector3 {
+	u8 byte1;
+	u8 byte2;
+} __packed;
+
+struct option_vector4 {
+	u8 byte1;
+	u8 min_vp_cap;
+} __packed;
+
+struct option_vector5 {
+	u8 byte1;
+	u8 byte2;
+	u8 byte3;
+	u8 cmo;
+	u8 associativity;
+	u8 bin_opts;
+	u8 micro_checkpoint;
+	u8 reserved0;
+	__be32 max_cpus;
+	__be16 papr_level;
+	__be16 reserved1;
+	u8 platform_facilities;
+	u8 reserved2;
+	__be16 reserved3;
+	u8 subprocessors;
+	u8 byte22;
+	u8 intarch;
+	u8 mmu;
+	u8 hash_ext;
+	u8 radix_ext;
+} __packed;
+
+struct option_vector6 {
+	u8 reserved;
+	u8 secondary_pteg;
+	u8 os_name;
+} __packed;
+
+struct option_vector7 {
+	u8 os_id[256];
+} __packed;
+
+struct ibm_arch_vec {
+	struct { u32 mask, val; } pvrs[14];
+
+	u8 num_vectors;
+
+	u8 vec1_len;
+	struct option_vector1 vec1;
+
+	u8 vec2_len;
+	struct option_vector2 vec2;
+
+	u8 vec3_len;
+	struct option_vector3 vec3;
+
+	u8 vec4_len;
+	struct option_vector4 vec4;
+
+	u8 vec5_len;
+	struct option_vector5 vec5;
+
+	u8 vec6_len;
+	struct option_vector6 vec6;
+
+	u8 vec7_len;
+	struct option_vector7 vec7;
+} __packed;
+
+static const struct ibm_arch_vec ibm_architecture_vec_template __initconst = {
+	.pvrs = {
+		{
+			.mask = cpu_to_be32(0xfffe0000), /* POWER5/POWER5+ */
+			.val  = cpu_to_be32(0x003a0000),
+		},
+		{
+			.mask = cpu_to_be32(0xffff0000), /* POWER6 */
+			.val  = cpu_to_be32(0x003e0000),
+		},
+		{
+			.mask = cpu_to_be32(0xffff0000), /* POWER7 */
+			.val  = cpu_to_be32(0x003f0000),
+		},
+		{
+			.mask = cpu_to_be32(0xffff0000), /* POWER8E */
+			.val  = cpu_to_be32(0x004b0000),
+		},
+		{
+			.mask = cpu_to_be32(0xffff0000), /* POWER8NVL */
+			.val  = cpu_to_be32(0x004c0000),
+		},
+		{
+			.mask = cpu_to_be32(0xffff0000), /* POWER8 */
+			.val  = cpu_to_be32(0x004d0000),
+		},
+		{
+			.mask = cpu_to_be32(0xffff0000), /* POWER9 */
+			.val  = cpu_to_be32(0x004e0000),
+		},
+		{
+			.mask = cpu_to_be32(0xffff0000), /* POWER10 */
+			.val  = cpu_to_be32(0x00800000),
+		},
+		{
+			.mask = cpu_to_be32(0xffffffff), /* all 3.1-compliant */
+			.val  = cpu_to_be32(0x0f000006),
+		},
+		{
+			.mask = cpu_to_be32(0xffffffff), /* all 3.00-compliant */
+			.val  = cpu_to_be32(0x0f000005),
+		},
+		{
+			.mask = cpu_to_be32(0xffffffff), /* all 2.07-compliant */
+			.val  = cpu_to_be32(0x0f000004),
+		},
+		{
+			.mask = cpu_to_be32(0xffffffff), /* all 2.06-compliant */
+			.val  = cpu_to_be32(0x0f000003),
+		},
+		{
+			.mask = cpu_to_be32(0xffffffff), /* all 2.05-compliant */
+			.val  = cpu_to_be32(0x0f000002),
+		},
+		{
+			.mask = cpu_to_be32(0xfffffffe), /* all 2.04-compliant and earlier */
+			.val  = cpu_to_be32(0x0f000001),
+		},
+	},
+
+	.num_vectors = NUM_VECTORS(6),
+
+	.vec1_len = VECTOR_LENGTH(sizeof(struct option_vector1)),
+	.vec1 = {
+		.byte1 = 0,
+		.arch_versions = OV1_PPC_2_00 | OV1_PPC_2_01 | OV1_PPC_2_02 | OV1_PPC_2_03 |
+				 OV1_PPC_2_04 | OV1_PPC_2_05 | OV1_PPC_2_06 | OV1_PPC_2_07,
+		.arch_versions3 = OV1_PPC_3_00 | OV1_PPC_3_1,
+	},
+
+	.vec2_len = VECTOR_LENGTH(sizeof(struct option_vector2)),
+	/* option vector 2: Open Firmware options supported */
+	.vec2 = {
+		.byte1 = OV2_REAL_MODE,
+		.reserved = 0,
+		.real_base = cpu_to_be32(0xffffffff),
+		.real_size = cpu_to_be32(0xffffffff),
+		.virt_base = cpu_to_be32(0xffffffff),
+		.virt_size = cpu_to_be32(0xffffffff),
+		.load_base = cpu_to_be32(0xffffffff),
+		.min_rma = cpu_to_be32(512),		/* 512MB min RMA */
+		.min_load = cpu_to_be32(0xffffffff),	/* full client load */
+		.min_rma_percent = 0,	/* min RMA percentage of total RAM */
+		.max_pft_size = 48,	/* max log_2(hash table size) */
+	},
+
+	.vec3_len = VECTOR_LENGTH(sizeof(struct option_vector3)),
+	/* option vector 3: processor options supported */
+	.vec3 = {
+		.byte1 = 0,			/* don't ignore, don't halt */
+		.byte2 = OV3_FP | OV3_VMX | OV3_DFP,
+	},
+
+	.vec4_len = VECTOR_LENGTH(sizeof(struct option_vector4)),
+	/* option vector 4: IBM PAPR implementation */
+	.vec4 = {
+		.byte1 = 0,			/* don't halt */
+		.min_vp_cap = OV4_MIN_ENT_CAP,	/* minimum VP entitled capacity */
+	},
+
+	.vec5_len = VECTOR_LENGTH(sizeof(struct option_vector5)),
+	/* option vector 5: PAPR/OF options */
+	.vec5 = {
+		.byte1 = 0,				/* don't ignore, don't halt */
+		.byte2 = OV5_FEAT(OV5_LPAR) | OV5_FEAT(OV5_SPLPAR) | OV5_FEAT(OV5_LARGE_PAGES) |
+		OV5_FEAT(OV5_DRCONF_MEMORY) | OV5_FEAT(OV5_DONATE_DEDICATE_CPU) |
+#ifdef CONFIG_PCI_MSI
+		/* PCIe/MSI support.  Without MSI full PCIe is not supported */
+		OV5_FEAT(OV5_MSI),
+#else
+		0,
+#endif
+		.byte3 = 0,
+		.cmo =
+#ifdef CONFIG_PPC_SMLPAR
+		OV5_FEAT(OV5_CMO) | OV5_FEAT(OV5_XCMO),
+#else
+		0,
+#endif
+		.associativity = OV5_FEAT(OV5_FORM1_AFFINITY) | OV5_FEAT(OV5_PRRN) |
+		OV5_FEAT(OV5_FORM2_AFFINITY),
+		.bin_opts = OV5_FEAT(OV5_RESIZE_HPT) | OV5_FEAT(OV5_HP_EVT),
+		.micro_checkpoint = 0,
+		.reserved0 = 0,
+		.max_cpus = cpu_to_be32(NR_CPUS),	/* number of cores supported */
+		.papr_level = 0,
+		.reserved1 = 0,
+		.platform_facilities = OV5_FEAT(OV5_PFO_HW_RNG) | OV5_FEAT(OV5_PFO_HW_ENCR) | OV5_FEAT(OV5_PFO_HW_842),
+		.reserved2 = 0,
+		.reserved3 = 0,
+		.subprocessors = 1,
+		.byte22 = OV5_FEAT(OV5_DRMEM_V2) | OV5_FEAT(OV5_DRC_INFO),
+		.intarch = 0,
+		.mmu = 0,
+		.hash_ext = 0,
+		.radix_ext = 0,
+	},
+
+	/* option vector 6: IBM PAPR hints */
+	.vec6_len = VECTOR_LENGTH(sizeof(struct option_vector6)),
+	.vec6 = {
+		.reserved = 0,
+		.secondary_pteg = 0,
+		.os_name = OV6_LINUX,
+	},
+
+	/* option vector 7: OS Identification */
+	.vec7_len = VECTOR_LENGTH(sizeof(struct option_vector7)),
+};
+
+static struct ibm_arch_vec __prombss ibm_architecture_vec  ____cacheline_aligned;
+
+/* Old method - ELF header with PT_NOTE sections only works on BE */
+#ifdef __BIG_ENDIAN__
+static const 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 __initconst = {
+	.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
+		}
+	}
+};
+#endif /* __BIG_ENDIAN__ */
+
+static int __init prom_count_smt_threads(void)
+{
+	phandle node;
+	char type[64];
+	unsigned int plen;
+
+	/* Pick up th first CPU node we can find */
+	for (node = 0; prom_next_node(&node); ) {
+		type[0] = 0;
+		prom_getprop(node, "device_type", type, sizeof(type));
+
+		if (prom_strcmp(type, "cpu"))
+			continue;
+		/*
+		 * There is an entry for each smt thread, each entry being
+		 * 4 bytes long.  All cpus should have the same number of
+		 * smt threads, so return after finding the first.
+		 */
+		plen = prom_getproplen(node, "ibm,ppc-interrupt-server#s");
+		if (plen == PROM_ERROR)
+			break;
+		plen >>= 2;
+		prom_debug("Found %lu smt threads per core\n", (unsigned long)plen);
+
+		/* Sanity check */
+		if (plen < 1 || plen > 64) {
+			prom_printf("Threads per core %lu out of bounds, assuming 1\n",
+				    (unsigned long)plen);
+			return 1;
+		}
+		return plen;
+	}
+	prom_debug("No threads found, assuming 1 per core\n");
+
+	return 1;
+
+}
+
+static void __init prom_parse_mmu_model(u8 val,
+					struct platform_support *support)
+{
+	switch (val) {
+	case OV5_FEAT(OV5_MMU_DYNAMIC):
+	case OV5_FEAT(OV5_MMU_EITHER): /* Either Available */
+		prom_debug("MMU - either supported\n");
+		support->radix_mmu = !prom_radix_disable;
+		support->hash_mmu = true;
+		break;
+	case OV5_FEAT(OV5_MMU_RADIX): /* Only Radix */
+		prom_debug("MMU - radix only\n");
+		if (prom_radix_disable) {
+			/*
+			 * If we __have__ to do radix, we're better off ignoring
+			 * the command line rather than not booting.
+			 */
+			prom_printf("WARNING: Ignoring cmdline option disable_radix\n");
+		}
+		support->radix_mmu = true;
+		break;
+	case OV5_FEAT(OV5_MMU_HASH):
+		prom_debug("MMU - hash only\n");
+		support->hash_mmu = true;
+		break;
+	default:
+		prom_debug("Unknown mmu support option: 0x%x\n", val);
+		break;
+	}
+}
+
+static void __init prom_parse_xive_model(u8 val,
+					 struct platform_support *support)
+{
+	switch (val) {
+	case OV5_FEAT(OV5_XIVE_EITHER): /* Either Available */
+		prom_debug("XIVE - either mode supported\n");
+		support->xive = !prom_xive_disable;
+		break;
+	case OV5_FEAT(OV5_XIVE_EXPLOIT): /* Only Exploitation mode */
+		prom_debug("XIVE - exploitation mode supported\n");
+		if (prom_xive_disable) {
+			/*
+			 * If we __have__ to do XIVE, we're better off ignoring
+			 * the command line rather than not booting.
+			 */
+			prom_printf("WARNING: Ignoring cmdline option xive=off\n");
+		}
+		support->xive = true;
+		break;
+	case OV5_FEAT(OV5_XIVE_LEGACY): /* Only Legacy mode */
+		prom_debug("XIVE - legacy mode supported\n");
+		break;
+	default:
+		prom_debug("Unknown xive support option: 0x%x\n", val);
+		break;
+	}
+}
+
+static void __init prom_parse_platform_support(u8 index, u8 val,
+					       struct platform_support *support)
+{
+	switch (index) {
+	case OV5_INDX(OV5_MMU_SUPPORT): /* MMU Model */
+		prom_parse_mmu_model(val & OV5_FEAT(OV5_MMU_SUPPORT), support);
+		break;
+	case OV5_INDX(OV5_RADIX_GTSE): /* Radix Extensions */
+		if (val & OV5_FEAT(OV5_RADIX_GTSE))
+			support->radix_gtse = !prom_radix_gtse_disable;
+		break;
+	case OV5_INDX(OV5_XIVE_SUPPORT): /* Interrupt mode */
+		prom_parse_xive_model(val & OV5_FEAT(OV5_XIVE_SUPPORT),
+				      support);
+		break;
+	}
+}
+
+static void __init prom_check_platform_support(void)
+{
+	struct platform_support supported = {
+		.hash_mmu = false,
+		.radix_mmu = false,
+		.radix_gtse = false,
+		.xive = false
+	};
+	int prop_len = prom_getproplen(prom.chosen,
+				       "ibm,arch-vec-5-platform-support");
+
+	/*
+	 * First copy the architecture vec template
+	 *
+	 * use memcpy() instead of *vec = *vec_template so that GCC replaces it
+	 * by __memcpy() when KASAN is active
+	 */
+	memcpy(&ibm_architecture_vec, &ibm_architecture_vec_template,
+	       sizeof(ibm_architecture_vec));
+
+	prom_strscpy_pad(ibm_architecture_vec.vec7.os_id, linux_banner, 256);
+
+	if (prop_len > 1) {
+		int i;
+		u8 vec[8];
+		prom_debug("Found ibm,arch-vec-5-platform-support, len: %d\n",
+			   prop_len);
+		if (prop_len > sizeof(vec))
+			prom_printf("WARNING: ibm,arch-vec-5-platform-support longer than expected (len: %d)\n",
+				    prop_len);
+		prom_getprop(prom.chosen, "ibm,arch-vec-5-platform-support", &vec, sizeof(vec));
+		for (i = 0; i < prop_len; i += 2) {
+			prom_debug("%d: index = 0x%x val = 0x%x\n", i / 2, vec[i], vec[i + 1]);
+			prom_parse_platform_support(vec[i], vec[i + 1], &supported);
+		}
+	}
+
+	if (supported.radix_mmu && IS_ENABLED(CONFIG_PPC_RADIX_MMU)) {
+		/* Radix preferred - Check if GTSE is also supported */
+		prom_debug("Asking for radix\n");
+		ibm_architecture_vec.vec5.mmu = OV5_FEAT(OV5_MMU_RADIX);
+		if (supported.radix_gtse)
+			ibm_architecture_vec.vec5.radix_ext =
+					OV5_FEAT(OV5_RADIX_GTSE);
+		else
+			prom_debug("Radix GTSE isn't supported\n");
+	} else if (supported.hash_mmu) {
+		/* Default to hash mmu (if we can) */
+		prom_debug("Asking for hash\n");
+		ibm_architecture_vec.vec5.mmu = OV5_FEAT(OV5_MMU_HASH);
+	} else {
+		/* We're probably on a legacy hypervisor */
+		prom_debug("Assuming legacy hash support\n");
+	}
+
+	if (supported.xive) {
+		prom_debug("Asking for XIVE\n");
+		ibm_architecture_vec.vec5.intarch = OV5_FEAT(OV5_XIVE_EXPLOIT);
+	}
+}
+
+static void __init prom_send_capabilities(void)
+{
+	ihandle root;
+	prom_arg_t ret;
+	u32 cores;
+
+	/* Check ibm,arch-vec-5-platform-support and fixup vec5 if required */
+	prom_check_platform_support();
+
+	root = call_prom("open", 1, 1, ADDR("/"));
+	if (root != 0) {
+		/* We need to tell the FW about the number of cores we support.
+		 *
+		 * To do that, we count the number of threads on the first core
+		 * (we assume this is the same for all cores) and use it to
+		 * divide NR_CPUS.
+		 */
+
+		cores = DIV_ROUND_UP(NR_CPUS, prom_count_smt_threads());
+		prom_printf("Max number of cores passed to firmware: %u (NR_CPUS = %d)\n",
+			    cores, NR_CPUS);
+
+		ibm_architecture_vec.vec5.max_cpus = cpu_to_be32(cores);
+
+		/* try calling the ibm,client-architecture-support method */
+		prom_printf("Calling ibm,client-architecture-support...");
+		if (call_prom_ret("call-method", 3, 2, &ret,
+				  ADDR("ibm,client-architecture-support"),
+				  root,
+				  ADDR(&ibm_architecture_vec)) == 0) {
+			/* the call exists... */
+			if (ret)
+				prom_printf("\nWARNING: ibm,client-architecture"
+					    "-support call FAILED!\n");
+			call_prom("close", 1, 0, root);
+			prom_printf(" done\n");
+			return;
+		}
+		call_prom("close", 1, 0, root);
+		prom_printf(" not implemented\n");
+	}
+
+#ifdef __BIG_ENDIAN__
+	{
+		ihandle elfloader;
+
+		/* no ibm,client-architecture-support call, try the old way */
+		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 /* __BIG_ENDIAN__ */
+}
+#endif /* CONFIG_PPC_PSERIES */
+
+/*
+ * 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)
+{
+	unsigned long base = alloc_bottom;
+	unsigned long addr = 0;
+
+	if (align)
+		base = ALIGN(base, align);
+	prom_debug("%s(%lx, %lx)\n", __func__, size, align);
+	if (ram_top == 0)
+		prom_panic("alloc_up() called with mem not initialized\n");
+
+	if (align)
+		base = ALIGN(alloc_bottom, align);
+	else
+		base = alloc_bottom;
+
+	for(; (base + size) <= alloc_top; 
+	    base = ALIGN(base + 0x100000, align)) {
+		prom_debug("    trying: 0x%lx\n\r", base);
+		addr = (unsigned long)prom_claim(base, size, 0);
+		if (addr != PROM_ERROR && addr != 0)
+			break;
+		addr = 0;
+		if (align == 0)
+			break;
+	}
+	if (addr == 0)
+		return 0;
+	alloc_bottom = addr + size;
+
+	prom_debug(" -> %lx\n", addr);
+	prom_debug("  alloc_bottom : %lx\n", alloc_bottom);
+	prom_debug("  alloc_top    : %lx\n", alloc_top);
+	prom_debug("  alloc_top_hi : %lx\n", alloc_top_high);
+	prom_debug("  rmo_top      : %lx\n", rmo_top);
+	prom_debug("  ram_top      : %lx\n", 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("%s(%lx, %lx, %s)\n", __func__, size, align,
+		   highmem ? "(high)" : "(low)");
+	if (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(alloc_top_high - size, align);
+		if (addr <= 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 < rmo_top) {
+			/* Good, we are first */
+			if (alloc_top == rmo_top)
+				alloc_top = rmo_top = addr;
+			else
+				return 0;
+		}
+		alloc_top_high = addr;
+		goto bail;
+	}
+
+	base = ALIGN_DOWN(alloc_top - size, align);
+	for (; base > alloc_bottom;
+	     base = ALIGN_DOWN(base - 0x100000, align))  {
+		prom_debug("    trying: 0x%lx\n\r", base);
+		addr = (unsigned long)prom_claim(base, size, 0);
+		if (addr != PROM_ERROR && addr != 0)
+			break;
+		addr = 0;
+	}
+	if (addr == 0)
+		return 0;
+	alloc_top = addr;
+
+ bail:
+	prom_debug(" -> %lx\n", addr);
+	prom_debug("  alloc_bottom : %lx\n", alloc_bottom);
+	prom_debug("  alloc_top    : %lx\n", alloc_top);
+	prom_debug("  alloc_top_hi : %lx\n", alloc_top_high);
+	prom_debug("  rmo_top      : %lx\n", rmo_top);
+	prom_debug("  ram_top      : %lx\n", 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 = be32_to_cpu(*p++);
+#ifdef CONFIG_PPC64
+	if (s > 1) {
+		r <<= 32;
+		r |= be32_to_cpu(*(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 __init reserve_mem(u64 base, u64 size)
+{
+	u64 top = base + size;
+	unsigned long cnt = 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(top, PAGE_SIZE);
+	size = top - base;
+
+	if (cnt >= (MEM_RESERVE_MAP_SIZE - 1))
+		prom_panic("Memory reserve map exhausted !\n");
+	mem_reserve_map[cnt].base = cpu_to_be64(base);
+	mem_reserve_map[cnt].size = cpu_to_be64(size);
+	mem_reserve_cnt = cnt + 1;
+}
+
+/*
+ * Initialize memory allocation mechanism, 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 type[64];
+	unsigned int plen;
+	cell_t *p, *endp;
+	__be32 val;
+	u32 rac, rsc;
+
+	/*
+	 * We iterate the memory nodes to find
+	 * 1) top of RMO (first node)
+	 * 2) top of memory
+	 */
+	val = cpu_to_be32(2);
+	prom_getprop(prom.root, "#address-cells", &val, sizeof(val));
+	rac = be32_to_cpu(val);
+	val = cpu_to_be32(1);
+	prom_getprop(prom.root, "#size-cells", &val, sizeof(rsc));
+	rsc = be32_to_cpu(val);
+	prom_debug("root_addr_cells: %x\n", rac);
+	prom_debug("root_size_cells: %x\n", rsc);
+
+	prom_debug("scanning memory:\n");
+
+	for (node = 0; prom_next_node(&node); ) {
+		type[0] = 0;
+		prom_getprop(node, "device_type", type, sizeof(type));
+
+		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));
+		}
+		if (prom_strcmp(type, "memory"))
+			continue;
+
+		plen = prom_getprop(node, "reg", regbuf, sizeof(regbuf));
+		if (plen > sizeof(regbuf)) {
+			prom_printf("memory node too large for buffer !\n");
+			plen = sizeof(regbuf);
+		}
+		p = regbuf;
+		endp = p + (plen / sizeof(cell_t));
+
+#ifdef DEBUG_PROM
+		memset(prom_scratch, 0, sizeof(prom_scratch));
+		call_prom("package-to-path", 3, 1, node, prom_scratch,
+			  sizeof(prom_scratch) - 1);
+		prom_debug("  node %s :\n", prom_scratch);
+#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("    %lx %lx\n", base, size);
+			if (base == 0 && (of_platform & PLATFORM_LPAR))
+				rmo_top = size;
+			if ((base + size) > ram_top)
+				ram_top = base + size;
+		}
+	}
+
+	alloc_bottom = PAGE_ALIGN((unsigned long)&_end + 0x4000);
+
+	/*
+	 * 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.
+	 */
+
+	alloc_top_high = ram_top;
+
+	if (prom_memory_limit) {
+		if (prom_memory_limit <= alloc_bottom) {
+			prom_printf("Ignoring mem=%lx <= alloc_bottom.\n",
+				    prom_memory_limit);
+			prom_memory_limit = 0;
+		} else if (prom_memory_limit >= ram_top) {
+			prom_printf("Ignoring mem=%lx >= ram_top.\n",
+				    prom_memory_limit);
+			prom_memory_limit = 0;
+		} else {
+			ram_top = prom_memory_limit;
+			rmo_top = min(rmo_top, 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 (!rmo_top)
+		rmo_top = ram_top;
+	rmo_top = min(0x30000000ul, rmo_top);
+	alloc_top = rmo_top;
+	alloc_top_high = ram_top;
+
+	/*
+	 * Check if we have an initrd after the kernel but still inside
+	 * the RMO.  If we do move our bottom point to after it.
+	 */
+	if (prom_initrd_start &&
+	    prom_initrd_start < rmo_top &&
+	    prom_initrd_end > alloc_bottom)
+		alloc_bottom = PAGE_ALIGN(prom_initrd_end);
+
+	prom_printf("memory layout at init:\n");
+	prom_printf("  memory_limit : %lx (16 MB aligned)\n",
+		    prom_memory_limit);
+	prom_printf("  alloc_bottom : %lx\n", alloc_bottom);
+	prom_printf("  alloc_top    : %lx\n", alloc_top);
+	prom_printf("  alloc_top_hi : %lx\n", alloc_top_high);
+	prom_printf("  rmo_top      : %lx\n", rmo_top);
+	prom_printf("  ram_top      : %lx\n", ram_top);
+}
+
+static void __init prom_close_stdin(void)
+{
+	__be32 val;
+	ihandle stdin;
+
+	if (prom_getprop(prom.chosen, "stdin", &val, sizeof(val)) > 0) {
+		stdin = be32_to_cpu(val);
+		call_prom("close", 1, 0, stdin);
+	}
+}
+
+#ifdef CONFIG_PPC_SVM
+static int __init prom_rtas_hcall(uint64_t args)
+{
+	register uint64_t arg1 asm("r3") = H_RTAS;
+	register uint64_t arg2 asm("r4") = args;
+
+	asm volatile("sc 1\n" : "=r" (arg1) :
+			"r" (arg1),
+			"r" (arg2) :);
+	srr_regs_clobbered();
+
+	return arg1;
+}
+
+static struct rtas_args __prombss os_term_args;
+
+static void __init prom_rtas_os_term(char *str)
+{
+	phandle rtas_node;
+	__be32 val;
+	u32 token;
+
+	prom_debug("%s: start...\n", __func__);
+	rtas_node = call_prom("finddevice", 1, 1, ADDR("/rtas"));
+	prom_debug("rtas_node: %x\n", rtas_node);
+	if (!PHANDLE_VALID(rtas_node))
+		return;
+
+	val = 0;
+	prom_getprop(rtas_node, "ibm,os-term", &val, sizeof(val));
+	token = be32_to_cpu(val);
+	prom_debug("ibm,os-term: %x\n", token);
+	if (token == 0)
+		prom_panic("Could not get token for ibm,os-term\n");
+	os_term_args.token = cpu_to_be32(token);
+	os_term_args.nargs = cpu_to_be32(1);
+	os_term_args.nret = cpu_to_be32(1);
+	os_term_args.args[0] = cpu_to_be32(__pa(str));
+	prom_rtas_hcall((uint64_t)&os_term_args);
+}
+#endif /* CONFIG_PPC_SVM */
+
+/*
+ * Allocate room for and instantiate RTAS
+ */
+static void __init prom_instantiate_rtas(void)
+{
+	phandle rtas_node;
+	ihandle rtas_inst;
+	u32 base, entry = 0;
+	__be32 val;
+	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;
+
+	val = 0;
+	prom_getprop(rtas_node, "rtas-size", &val, sizeof(size));
+	size = be32_to_cpu(val);
+	if (size == 0)
+		return;
+
+	base = alloc_down(size, PAGE_SIZE, 0);
+	if (base == 0)
+		prom_panic("Could not allocate memory for RTAS\n");
+
+	rtas_inst = call_prom("open", 1, 1, ADDR("/rtas"));
+	if (!IHANDLE_VALID(rtas_inst)) {
+		prom_printf("opening rtas package failed (%x)\n", rtas_inst);
+		return;
+	}
+
+	prom_printf("instantiating rtas at 0x%x...", base);
+
+	if (call_prom_ret("call-method", 3, 2, &entry,
+			  ADDR("instantiate-rtas"),
+			  rtas_inst, base) != 0
+	    || entry == 0) {
+		prom_printf(" failed\n");
+		return;
+	}
+	prom_printf(" done\n");
+
+	reserve_mem(base, size);
+
+	val = cpu_to_be32(base);
+	prom_setprop(rtas_node, "/rtas", "linux,rtas-base",
+		     &val, sizeof(val));
+	val = cpu_to_be32(entry);
+	prom_setprop(rtas_node, "/rtas", "linux,rtas-entry",
+		     &val, sizeof(val));
+
+	/* Check if it supports "query-cpu-stopped-state" */
+	if (prom_getprop(rtas_node, "query-cpu-stopped-state",
+			 &val, sizeof(val)) != PROM_ERROR)
+		rtas_has_query_cpu_stopped = true;
+
+	prom_debug("rtas base     = 0x%x\n", base);
+	prom_debug("rtas entry    = 0x%x\n", entry);
+	prom_debug("rtas size     = 0x%x\n", size);
+
+	prom_debug("prom_instantiate_rtas: end...\n");
+}
+
+#ifdef CONFIG_PPC64
+/*
+ * Allocate room for and instantiate Stored Measurement Log (SML)
+ */
+static void __init prom_instantiate_sml(void)
+{
+	phandle ibmvtpm_node;
+	ihandle ibmvtpm_inst;
+	u32 entry = 0, size = 0, succ = 0;
+	u64 base;
+	__be32 val;
+
+	prom_debug("prom_instantiate_sml: start...\n");
+
+	ibmvtpm_node = call_prom("finddevice", 1, 1, ADDR("/vdevice/vtpm"));
+	prom_debug("ibmvtpm_node: %x\n", ibmvtpm_node);
+	if (!PHANDLE_VALID(ibmvtpm_node))
+		return;
+
+	ibmvtpm_inst = call_prom("open", 1, 1, ADDR("/vdevice/vtpm"));
+	if (!IHANDLE_VALID(ibmvtpm_inst)) {
+		prom_printf("opening vtpm package failed (%x)\n", ibmvtpm_inst);
+		return;
+	}
+
+	if (prom_getprop(ibmvtpm_node, "ibm,sml-efi-reformat-supported",
+			 &val, sizeof(val)) != PROM_ERROR) {
+		if (call_prom_ret("call-method", 2, 2, &succ,
+				  ADDR("reformat-sml-to-efi-alignment"),
+				  ibmvtpm_inst) != 0 || succ == 0) {
+			prom_printf("Reformat SML to EFI alignment failed\n");
+			return;
+		}
+
+		if (call_prom_ret("call-method", 2, 2, &size,
+				  ADDR("sml-get-allocated-size"),
+				  ibmvtpm_inst) != 0 || size == 0) {
+			prom_printf("SML get allocated size failed\n");
+			return;
+		}
+	} else {
+		if (call_prom_ret("call-method", 2, 2, &size,
+				  ADDR("sml-get-handover-size"),
+				  ibmvtpm_inst) != 0 || size == 0) {
+			prom_printf("SML get handover size failed\n");
+			return;
+		}
+	}
+
+	base = alloc_down(size, PAGE_SIZE, 0);
+	if (base == 0)
+		prom_panic("Could not allocate memory for sml\n");
+
+	prom_printf("instantiating sml at 0x%llx...", base);
+
+	memset((void *)base, 0, size);
+
+	if (call_prom_ret("call-method", 4, 2, &entry,
+			  ADDR("sml-handover"),
+			  ibmvtpm_inst, size, base) != 0 || entry == 0) {
+		prom_printf("SML handover failed\n");
+		return;
+	}
+	prom_printf(" done\n");
+
+	reserve_mem(base, size);
+
+	prom_setprop(ibmvtpm_node, "/vdevice/vtpm", "linux,sml-base",
+		     &base, sizeof(base));
+	prom_setprop(ibmvtpm_node, "/vdevice/vtpm", "linux,sml-size",
+		     &size, sizeof(size));
+
+	prom_debug("sml base     = 0x%llx\n", base);
+	prom_debug("sml size     = 0x%x\n", size);
+
+	prom_debug("prom_instantiate_sml: end...\n");
+}
+
+/*
+ * Allocate room for and initialize TCE tables
+ */
+#ifdef __BIG_ENDIAN__
+static void __init prom_initialize_tce_table(void)
+{
+	phandle node;
+	ihandle phb_node;
+	char compatible[64], type[64], model[64];
+	char *path = prom_scratch;
+	u64 base, align;
+	u32 minalign, minsize;
+	u64 tce_entry, *tce_entryp;
+	u64 local_alloc_top, local_alloc_bottom;
+	u64 i;
+
+	if (prom_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 = 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) || (prom_strstr(type, "pci") == NULL))
+			continue;
+
+		/* Keep the old logic intact to avoid regression. */
+		if (compatible[0] != 0) {
+			if ((prom_strstr(compatible, "python") == NULL) &&
+			    (prom_strstr(compatible, "Speedwagon") == NULL) &&
+			    (prom_strstr(compatible, "Winnipeg") == NULL))
+				continue;
+		} else if (model[0] != 0) {
+			if ((prom_strstr(model, "ython") == NULL) &&
+			    (prom_strstr(model, "peedwagon") == NULL) &&
+			    (prom_strstr(model, "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.
+		 */
+		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;
+
+		/* It seems OF doesn't null-terminate the path :-( */
+		memset(path, 0, sizeof(prom_scratch));
+		/* Call OF to setup the TCE hardware */
+		if (call_prom("package-to-path", 3, 1, node,
+			      path, sizeof(prom_scratch) - 1) == PROM_ERROR) {
+			prom_printf("package-to-path failed\n");
+		}
+
+		/* Save away the TCE table attributes for later use. */
+		prom_setprop(node, path, "linux,tce-base", &base, sizeof(base));
+		prom_setprop(node, path, "linux,tce-size", &minsize, sizeof(minsize));
+
+		prom_debug("TCE table: %s\n", path);
+		prom_debug("\tnode = 0x%x\n", node);
+		prom_debug("\tbase = 0x%llx\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 = (u64 *)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);
+
+	/* These are only really needed if there is a memory limit in
+	 * effect, but we don't know so export them always. */
+	prom_tce_alloc_start = local_alloc_bottom;
+	prom_tce_alloc_end = local_alloc_top;
+
+	/* Flag the first invalid entry */
+	prom_debug("ending prom_initialize_tce_table\n");
+}
+#endif /* __BIG_ENDIAN__ */
+#endif /* CONFIG_PPC64 */
+
+/*
+ * 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
+ */
+/*
+ * We want to reference the copy of __secondary_hold_* in the
+ * 0 - 0x100 address range
+ */
+#define LOW_ADDR(x)	(((unsigned long) &(x)) & 0xff)
+
+static void __init prom_hold_cpus(void)
+{
+	unsigned long i;
+	phandle node;
+	char type[64];
+	unsigned long *spinloop
+		= (void *) LOW_ADDR(__secondary_hold_spinloop);
+	unsigned long *acknowledge
+		= (void *) LOW_ADDR(__secondary_hold_acknowledge);
+	unsigned long secondary_hold = LOW_ADDR(__secondary_hold);
+
+	/*
+	 * On pseries, if RTAS supports "query-cpu-stopped-state",
+	 * we skip this stage, the CPUs will be started by the
+	 * kernel using RTAS.
+	 */
+	if ((of_platform == PLATFORM_PSERIES ||
+	     of_platform == PLATFORM_PSERIES_LPAR) &&
+	    rtas_has_query_cpu_stopped) {
+		prom_printf("prom_hold_cpus: skipped\n");
+		return;
+	}
+
+	prom_debug("prom_hold_cpus: start...\n");
+	prom_debug("    1) spinloop       = 0x%lx\n", (unsigned long)spinloop);
+	prom_debug("    1) *spinloop      = 0x%lx\n", *spinloop);
+	prom_debug("    1) acknowledge    = 0x%lx\n",
+		   (unsigned long)acknowledge);
+	prom_debug("    1) *acknowledge   = 0x%lx\n", *acknowledge);
+	prom_debug("    1) secondary_hold = 0x%lx\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;
+
+	/* look for cpus */
+	for (node = 0; prom_next_node(&node); ) {
+		unsigned int cpu_no;
+		__be32 reg;
+
+		type[0] = 0;
+		prom_getprop(node, "device_type", type, sizeof(type));
+		if (prom_strcmp(type, "cpu") != 0)
+			continue;
+
+		/* Skip non-configured cpus. */
+		if (prom_getprop(node, "status", type, sizeof(type)) > 0)
+			if (prom_strcmp(type, "okay") != 0)
+				continue;
+
+		reg = cpu_to_be32(-1); /* make sparse happy */
+		prom_getprop(node, "reg", &reg, sizeof(reg));
+		cpu_no = be32_to_cpu(reg);
+
+		prom_debug("cpu hw idx   = %u\n", cpu_no);
+
+		/* Init the acknowledge var which will be reset by
+		 * the secondary cpu when it awakens from its OF
+		 * spinloop.
+		 */
+		*acknowledge = (unsigned long)-1;
+
+		if (cpu_no != prom.cpu) {
+			/* Primary Thread of non-boot cpu or any thread */
+			prom_printf("starting cpu hw idx %u... ", cpu_no);
+			call_prom("start-cpu", 3, 0, node,
+				  secondary_hold, cpu_no);
+
+			for (i = 0; (i < 100000000) && 
+			     (*acknowledge == ((unsigned long)-1)); i++ )
+				mb();
+
+			if (*acknowledge == cpu_no)
+				prom_printf("done\n");
+			else
+				prom_printf("failed: %lx\n", *acknowledge);
+		}
+#ifdef CONFIG_SMP
+		else
+			prom_printf("boot cpu hw idx %u\n", cpu_no);
+#endif /* CONFIG_SMP */
+	}
+
+	prom_debug("prom_hold_cpus: end...\n");
+}
+
+
+static void __init prom_init_client_services(unsigned long pp)
+{
+	/* Get a handle to the prom entry point before anything else */
+	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 :( */
+
+	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.
+ * Also, on the longtrail, we need to work around other bugs.
+ */
+static void __init prom_find_mmu(void)
+{
+	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;
+	/* XXX might need to add other versions here */
+	if (prom_strcmp(version, "Open Firmware, 1.0.5") == 0)
+		of_workarounds = OF_WA_CLAIM;
+	else if (prom_strncmp(version, "FirmWorks,3.", 12) == 0) {
+		of_workarounds = OF_WA_CLAIM | OF_WA_LONGTRAIL;
+		call_prom("interpret", 1, 1, "dev /memory 0 to allow-reclaim");
+	} else
+		return;
+	prom.memory = call_prom("open", 1, 1, ADDR("/memory"));
+	prom_getprop(prom.chosen, "mmu", &prom.mmumap,
+		     sizeof(prom.mmumap));
+	prom.mmumap = be32_to_cpu(prom.mmumap);
+	if (!IHANDLE_VALID(prom.memory) || !IHANDLE_VALID(prom.mmumap))
+		of_workarounds &= ~OF_WA_CLAIM;		/* hmmm */
+}
+#else
+#define prom_find_mmu()
+#endif
+
+static void __init prom_init_stdout(void)
+{
+	char *path = of_stdout_device;
+	char type[16];
+	phandle stdout_node;
+	__be32 val;
+
+	if (prom_getprop(prom.chosen, "stdout", &val, sizeof(val)) <= 0)
+		prom_panic("cannot find stdout");
+
+	prom.stdout = be32_to_cpu(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);
+	prom_printf("OF stdout device is: %s\n", of_stdout_device);
+	prom_setprop(prom.chosen, "/chosen", "linux,stdout-path",
+		     path, prom_strlen(path) + 1);
+
+	/* instance-to-package fails on PA-Semi */
+	stdout_node = call_prom("instance-to-package", 1, 1, prom.stdout);
+	if (stdout_node != PROM_ERROR) {
+		val = cpu_to_be32(stdout_node);
+
+		/* If it's a display, note it */
+		memset(type, 0, sizeof(type));
+		prom_getprop(stdout_node, "device_type", type, sizeof(type));
+		if (prom_strcmp(type, "display") == 0)
+			prom_setprop(stdout_node, path, "linux,boot-display", NULL, 0);
+	}
+}
+
+static int __init prom_find_machine_type(void)
+{
+	static char compat[256] __prombss;
+	int len, i = 0;
+#ifdef CONFIG_PPC64
+	phandle rtas;
+	int x;
+#endif
+
+	/* Look for a PowerMac or a Cell */
+	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 = prom_strlen(p);
+			if (sl == 0)
+				break;
+			if (prom_strstr(p, "Power Macintosh") ||
+			    prom_strstr(p, "MacRISC"))
+				return PLATFORM_POWERMAC;
+#ifdef CONFIG_PPC64
+			/* We must make sure we don't detect the IBM Cell
+			 * blades as pSeries due to some firmware issues,
+			 * so we do it here.
+			 */
+			if (prom_strstr(p, "IBM,CBEA") ||
+			    prom_strstr(p, "IBM,CPBW-1.0"))
+				return PLATFORM_GENERIC;
+#endif /* CONFIG_PPC64 */
+			i += sl + 1;
+		}
+	}
+#ifdef CONFIG_PPC64
+	/* Try to figure out if it's an IBM pSeries or any other
+	 * PAPR compliant platform. We assume it is if :
+	 *  - /device_type is "chrp" (please, do NOT use that for future
+	 *    non-IBM designs !
+	 *  - it has /rtas
+	 */
+	len = prom_getprop(prom.root, "device_type",
+			   compat, sizeof(compat)-1);
+	if (len <= 0)
+		return PLATFORM_GENERIC;
+	if (prom_strcmp(compat, "chrp"))
+		return PLATFORM_GENERIC;
+
+	/* Default to pSeries. We need to know if we are running LPAR */
+	rtas = call_prom("finddevice", 1, 1, ADDR("/rtas"));
+	if (!PHANDLE_VALID(rtas))
+		return PLATFORM_GENERIC;
+	x = prom_getproplen(rtas, "ibm,hypertas-functions");
+	if (x != PROM_ERROR) {
+		prom_debug("Hypertas detected, assuming LPAR !\n");
+		return PLATFORM_PSERIES_LPAR;
+	}
+	return PLATFORM_PSERIES;
+#else
+	return PLATFORM_GENERIC;
+#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 const unsigned char default_colors[] __initconst = {
+		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_debug("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 (prom_strcmp(type, "display") != 0)
+			continue;
+
+		/* It seems OF doesn't null-terminate the path :-( */
+		path = prom_scratch;
+		memset(path, 0, sizeof(prom_scratch));
+
+		/*
+		 * leave some room at the end of the path for appending extra
+		 * arguments
+		 */
+		if (call_prom("package-to-path", 3, 1, node, path,
+			      sizeof(prom_scratch) - 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, path, "linux,opened", NULL, 0);
+
+		/* Setup a usable color table when the appropriate
+		 * method is available. Should update this to set-colors */
+		clut = default_colors;
+		for (i = 0; i < 16; i++, clut += 3)
+			if (prom_set_color(ih, i, clut[0], clut[1],
+					   clut[2]) != 0)
+				break;
+
+#ifdef CONFIG_LOGO_LINUX_CLUT224
+		clut = PTRRELOC(logo_linux_clut224.clut);
+		for (i = 0; i < 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 */
+
+#ifdef CONFIG_PPC_EARLY_DEBUG_BOOTX
+		if (prom_getprop(node, "linux,boot-display", NULL, 0) !=
+		    PROM_ERROR) {
+			u32 width, height, pitch, addr;
+
+			prom_printf("Setting btext !\n");
+
+			if (prom_getprop(node, "width", &width, 4) == PROM_ERROR)
+				return;
+
+			if (prom_getprop(node, "height", &height, 4) == PROM_ERROR)
+				return;
+
+			if (prom_getprop(node, "linebytes", &pitch, 4) == PROM_ERROR)
+				return;
+
+			if (prom_getprop(node, "address", &addr, 4) == PROM_ERROR)
+				return;
+
+			prom_printf("W=%d H=%d LB=%d addr=0x%x\n",
+				    width, height, pitch, addr);
+			btext_setup_display(width, height, 8, pitch, addr);
+			btext_prepare_BAT();
+		}
+#endif /* CONFIG_PPC_EARLY_DEBUG_BOOTX */
+	}
+}
+
+
+/* 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 %lx...\n",
+			   alloc_bottom);
+		room = alloc_top - 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)\n");
+		chunk = alloc_up(room, 0);
+		if (chunk == 0)
+			prom_panic("No memory for flatten_device_tree "
+				   "(claim failed)\n");
+		*mem_end = chunk + room;
+	}
+
+	ret = (void *)*mem_start;
+	*mem_start += needed;
+
+	return ret;
+}
+
+#define dt_push_token(token, mem_start, mem_end) do { 			\
+		void *room = make_room(mem_start, mem_end, 4, 4);	\
+		*(__be32 *)room = cpu_to_be32(token);			\
+	} while(0)
+
+static unsigned long __init dt_find_string(char *str)
+{
+	char *s, *os;
+
+	s = os = (char *)dt_string_start;
+	s += 4;
+	while (s <  (char *)dt_string_end) {
+		if (prom_strcmp(s, str) == 0)
+			return s - os;
+		s += prom_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 *)dt_string_start;
+
+	/* get and store all property names */
+	prev_name = "";
+	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 (prom_strcmp(namep, "name") == 0) {
+ 			*mem_start = (unsigned long)namep;
+ 			prev_name = "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 + prom_strlen(namep) + 1;
+			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] __prombss;
+	int l, room, has_phandle = 0;
+
+	dt_push_token(OF_DT_BEGIN_NODE, mem_start, mem_end);
+
+	/* get the node's full name */
+	namep = (char *)*mem_start;
+	room = *mem_end - *mem_start;
+	if (room > 255)
+		room = 255;
+	l = call_prom("package-to-path", 3, 1, node, namep, room);
+	if (l >= 0) {
+		/* Didn't fit?  Get more room. */
+		if (l >= room) {
+			if (l >= *mem_end - *mem_start)
+				namep = make_room(mem_start, mem_end, l+1, 1);
+			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
+		 * middle of the path in some properties, and extract
+		 * the unit name (everything after the last '/').
+		 */
+		for (lp = p = namep, ep = namep + l; p < ep; p++) {
+			if (*p == '/')
+				lp = namep;
+			else if (*p != 0)
+				*lp++ = *p;
+		}
+		*lp = 0;
+		*mem_start = ALIGN((unsigned long)lp + 1, 4);
+	}
+
+	/* get it again for debugging */
+	path = prom_scratch;
+	memset(path, 0, sizeof(prom_scratch));
+	call_prom("package-to-path", 3, 1, node, path, sizeof(prom_scratch) - 1);
+
+	/* get and store all properties */
+	prev_name = "";
+	sstart = (char *)dt_string_start;
+	for (;;) {
+		if (call_prom("nextprop", 3, 1, node, prev_name,
+			      pname) != 1)
+			break;
+
+ 		/* skip "name" */
+		if (prom_strcmp(pname, "name") == 0) {
+ 			prev_name = "name";
+ 			continue;
+ 		}
+
+		/* find string offset */
+		soff = dt_find_string(pname);
+		if (soff == 0) {
+			prom_printf("WARNING: Can't find string index for"
+				    " <%s>, node %s\n", pname, path);
+			break;
+		}
+		prev_name = sstart + soff;
+
+		/* get length */
+		l = call_prom("getproplen", 2, 1, node, pname);
+
+		/* sanity checks */
+		if (l == PROM_ERROR)
+			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, pname, valp, l);
+		*mem_start = ALIGN(*mem_start, 4);
+
+		if (!prom_strcmp(pname, "phandle"))
+			has_phandle = 1;
+	}
+
+	/* Add a "phandle" property if none already exist */
+	if (!has_phandle) {
+		soff = dt_find_string("phandle");
+		if (soff == 0)
+			prom_printf("WARNING: Can't find string index for <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);
+			*(__be32 *)valp = cpu_to_be32(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;
+	char *namep;
+	u64 *rsvmap;
+
+	/*
+	 * Check how much room we have between alloc top & bottom (+/- a
+	 * few pages), crop to 1MB, as this is our "chunk" size
+	 */
+	room = alloc_top - alloc_bottom - 0x4000;
+	if (room > DEVTREE_CHUNK_SIZE)
+		room = DEVTREE_CHUNK_SIZE;
+	prom_debug("starting device tree allocs at %lx\n", 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 = mem_start + room;
+
+	/* 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);
+	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);
+	dt_string_start = mem_start;
+	mem_start += 4; /* hole */
+
+	/* Add "phandle" in there, we'll need it */
+	namep = make_room(&mem_start, &mem_end, 16, 1);
+	prom_strscpy_pad(namep, "phandle", sizeof("phandle"));
+	mem_start = (unsigned long)namep + prom_strlen(namep) + 1;
+
+	/* Build string array */
+	prom_printf("Building dt strings...\n"); 
+	scan_dt_build_strings(root, &mem_start, &mem_end);
+	dt_string_end = mem_start;
+
+	/* Build structure */
+	mem_start = PAGE_ALIGN(mem_start);
+	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);
+	dt_struct_end = PAGE_ALIGN(mem_start);
+
+	/* Finish header */
+	hdr->boot_cpuid_phys = cpu_to_be32(prom.cpu);
+	hdr->magic = cpu_to_be32(OF_DT_HEADER);
+	hdr->totalsize = cpu_to_be32(dt_struct_end - dt_header_start);
+	hdr->off_dt_struct = cpu_to_be32(dt_struct_start - dt_header_start);
+	hdr->off_dt_strings = cpu_to_be32(dt_string_start - dt_header_start);
+	hdr->dt_strings_size = cpu_to_be32(dt_string_end - dt_string_start);
+	hdr->off_mem_rsvmap = cpu_to_be32(((unsigned long)rsvmap) - dt_header_start);
+	hdr->version = cpu_to_be32(OF_DT_VERSION);
+	/* Version 16 is not backward compatible */
+	hdr->last_comp_version = cpu_to_be32(0x10);
+
+	/* Copy the reserve map in */
+	memcpy(rsvmap, mem_reserve_map, sizeof(mem_reserve_map));
+
+#ifdef DEBUG_PROM
+	{
+		int i;
+		prom_printf("reserved memory map:\n");
+		for (i = 0; i < mem_reserve_cnt; i++)
+			prom_printf("  %llx - %llx\n",
+				    be64_to_cpu(mem_reserve_map[i].base),
+				    be64_to_cpu(mem_reserve_map[i].size));
+	}
+#endif
+	/* Bump mem_reserve_cnt to cause further reservations to fail
+	 * since it's too late.
+	 */
+	mem_reserve_cnt = MEM_RESERVE_MAP_SIZE;
+
+	prom_printf("Device tree strings 0x%lx -> 0x%lx\n",
+		    dt_string_start, dt_string_end);
+	prom_printf("Device tree struct  0x%lx -> 0x%lx\n",
+		    dt_struct_start, dt_struct_end);
+}
+
+#ifdef CONFIG_PPC_MAPLE
+/* PIBS Version 1.05.0000 04/26/2005 has an incorrect /ht/isa/ranges property.
+ * The values are bad, and it doesn't even have the right number of cells. */
+static void __init fixup_device_tree_maple(void)
+{
+	phandle isa;
+	u32 rloc = 0x01002000; /* IO space; PCI device = 4 */
+	u32 isa_ranges[6];
+	char *name;
+
+	name = "/ht@0/isa@4";
+	isa = call_prom("finddevice", 1, 1, ADDR(name));
+	if (!PHANDLE_VALID(isa)) {
+		name = "/ht@0/isa@6";
+		isa = call_prom("finddevice", 1, 1, ADDR(name));
+		rloc = 0x01003000; /* IO space; PCI device = 6 */
+	}
+	if (!PHANDLE_VALID(isa))
+		return;
+
+	if (prom_getproplen(isa, "ranges") != 12)
+		return;
+	if (prom_getprop(isa, "ranges", isa_ranges, sizeof(isa_ranges))
+		== PROM_ERROR)
+		return;
+
+	if (isa_ranges[0] != 0x1 ||
+		isa_ranges[1] != 0xf4000000 ||
+		isa_ranges[2] != 0x00010000)
+		return;
+
+	prom_printf("Fixing up bogus ISA range on Maple/Apache...\n");
+
+	isa_ranges[0] = 0x1;
+	isa_ranges[1] = 0x0;
+	isa_ranges[2] = rloc;
+	isa_ranges[3] = 0x0;
+	isa_ranges[4] = 0x0;
+	isa_ranges[5] = 0x00010000;
+	prom_setprop(isa, name, "ranges",
+			isa_ranges, sizeof(isa_ranges));
+}
+
+#define CPC925_MC_START		0xf8000000
+#define CPC925_MC_LENGTH	0x1000000
+/* The values for memory-controller don't have right number of cells */
+static void __init fixup_device_tree_maple_memory_controller(void)
+{
+	phandle mc;
+	u32 mc_reg[4];
+	char *name = "/hostbridge@f8000000";
+	u32 ac, sc;
+
+	mc = call_prom("finddevice", 1, 1, ADDR(name));
+	if (!PHANDLE_VALID(mc))
+		return;
+
+	if (prom_getproplen(mc, "reg") != 8)
+		return;
+
+	prom_getprop(prom.root, "#address-cells", &ac, sizeof(ac));
+	prom_getprop(prom.root, "#size-cells", &sc, sizeof(sc));
+	if ((ac != 2) || (sc != 2))
+		return;
+
+	if (prom_getprop(mc, "reg", mc_reg, sizeof(mc_reg)) == PROM_ERROR)
+		return;
+
+	if (mc_reg[0] != CPC925_MC_START || mc_reg[1] != CPC925_MC_LENGTH)
+		return;
+
+	prom_printf("Fixing up bogus hostbridge on Maple...\n");
+
+	mc_reg[0] = 0x0;
+	mc_reg[1] = CPC925_MC_START;
+	mc_reg[2] = 0x0;
+	mc_reg[3] = CPC925_MC_LENGTH;
+	prom_setprop(mc, name, "reg", mc_reg, sizeof(mc_reg));
+}
+#else
+#define fixup_device_tree_maple()
+#define fixup_device_tree_maple_memory_controller()
+#endif
+
+#ifdef CONFIG_PPC_CHRP
+/*
+ * Pegasos and BriQ lacks the "ranges" property in the isa node
+ * Pegasos needs decimal IRQ 14/15, not hexadecimal
+ * Pegasos has the IDE configured in legacy mode, but advertised as native
+ */
+static void __init fixup_device_tree_chrp(void)
+{
+	phandle ph;
+	u32 prop[6];
+	u32 rloc = 0x01006000; /* IO space; PCI device = 12 */
+	char *name;
+	int rc;
+
+	name = "/pci@80000000/isa@c";
+	ph = call_prom("finddevice", 1, 1, ADDR(name));
+	if (!PHANDLE_VALID(ph)) {
+		name = "/pci@ff500000/isa@6";
+		ph = call_prom("finddevice", 1, 1, ADDR(name));
+		rloc = 0x01003000; /* IO space; PCI device = 6 */
+	}
+	if (PHANDLE_VALID(ph)) {
+		rc = prom_getproplen(ph, "ranges");
+		if (rc == 0 || rc == PROM_ERROR) {
+			prom_printf("Fixing up missing ISA range on Pegasos...\n");
+
+			prop[0] = 0x1;
+			prop[1] = 0x0;
+			prop[2] = rloc;
+			prop[3] = 0x0;
+			prop[4] = 0x0;
+			prop[5] = 0x00010000;
+			prom_setprop(ph, name, "ranges", prop, sizeof(prop));
+		}
+	}
+
+	name = "/pci@80000000/ide@C,1";
+	ph = call_prom("finddevice", 1, 1, ADDR(name));
+	if (PHANDLE_VALID(ph)) {
+		prom_printf("Fixing up IDE interrupt on Pegasos...\n");
+		prop[0] = 14;
+		prop[1] = 0x0;
+		prom_setprop(ph, name, "interrupts", prop, 2*sizeof(u32));
+		prom_printf("Fixing up IDE class-code on Pegasos...\n");
+		rc = prom_getprop(ph, "class-code", prop, sizeof(u32));
+		if (rc == sizeof(u32)) {
+			prop[0] &= ~0x5;
+			prom_setprop(ph, name, "class-code", prop, sizeof(u32));
+		}
+	}
+}
+#else
+#define fixup_device_tree_chrp()
+#endif
+
+#if defined(CONFIG_PPC64) && defined(CONFIG_PPC_PMAC)
+static void __init fixup_device_tree_pmac(void)
+{
+	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 > 0x39)
+		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, "/u3@0,f8000000/i2c@f8001000", "interrupts",
+		     &interrupts, sizeof(interrupts));
+	parent = (u32)mpic;
+	prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupt-parent",
+		     &parent, sizeof(parent));
+}
+#else
+#define fixup_device_tree_pmac()
+#endif
+
+#ifdef CONFIG_PPC_EFIKA
+/*
+ * The MPC5200 FEC driver requires an phy-handle property to tell it how
+ * to talk to the phy.  If the phy-handle property is missing, then this
+ * function is called to add the appropriate nodes and link it to the
+ * ethernet node.
+ */
+static void __init fixup_device_tree_efika_add_phy(void)
+{
+	u32 node;
+	char prop[64];
+	int rv;
+
+	/* Check if /builtin/ethernet exists - bail if it doesn't */
+	node = call_prom("finddevice", 1, 1, ADDR("/builtin/ethernet"));
+	if (!PHANDLE_VALID(node))
+		return;
+
+	/* Check if the phy-handle property exists - bail if it does */
+	rv = prom_getprop(node, "phy-handle", prop, sizeof(prop));
+	if (rv <= 0)
+		return;
+
+	/*
+	 * At this point the ethernet device doesn't have a phy described.
+	 * Now we need to add the missing phy node and linkage
+	 */
+
+	/* Check for an MDIO bus node - if missing then create one */
+	node = call_prom("finddevice", 1, 1, ADDR("/builtin/mdio"));
+	if (!PHANDLE_VALID(node)) {
+		prom_printf("Adding Ethernet MDIO node\n");
+		call_prom("interpret", 1, 1,
+			" s\" /builtin\" find-device"
+			" new-device"
+				" 1 encode-int s\" #address-cells\" property"
+				" 0 encode-int s\" #size-cells\" property"
+				" s\" mdio\" device-name"
+				" s\" fsl,mpc5200b-mdio\" encode-string"
+				" s\" compatible\" property"
+				" 0xf0003000 0x400 reg"
+				" 0x2 encode-int"
+				" 0x5 encode-int encode+"
+				" 0x3 encode-int encode+"
+				" s\" interrupts\" property"
+			" finish-device");
+	}
+
+	/* Check for a PHY device node - if missing then create one and
+	 * give it's phandle to the ethernet node */
+	node = call_prom("finddevice", 1, 1,
+			 ADDR("/builtin/mdio/ethernet-phy"));
+	if (!PHANDLE_VALID(node)) {
+		prom_printf("Adding Ethernet PHY node\n");
+		call_prom("interpret", 1, 1,
+			" s\" /builtin/mdio\" find-device"
+			" new-device"
+				" s\" ethernet-phy\" device-name"
+				" 0x10 encode-int s\" reg\" property"
+				" my-self"
+				" ihandle>phandle"
+			" finish-device"
+			" s\" /builtin/ethernet\" find-device"
+				" encode-int"
+				" s\" phy-handle\" property"
+			" device-end");
+	}
+}
+
+static void __init fixup_device_tree_efika(void)
+{
+	int sound_irq[3] = { 2, 2, 0 };
+	int bcomm_irq[3*16] = { 3,0,0, 3,1,0, 3,2,0, 3,3,0,
+				3,4,0, 3,5,0, 3,6,0, 3,7,0,
+				3,8,0, 3,9,0, 3,10,0, 3,11,0,
+				3,12,0, 3,13,0, 3,14,0, 3,15,0 };
+	u32 node;
+	char prop[64];
+	int rv, len;
+
+	/* Check if we're really running on a EFIKA */
+	node = call_prom("finddevice", 1, 1, ADDR("/"));
+	if (!PHANDLE_VALID(node))
+		return;
+
+	rv = prom_getprop(node, "model", prop, sizeof(prop));
+	if (rv == PROM_ERROR)
+		return;
+	if (prom_strcmp(prop, "EFIKA5K2"))
+		return;
+
+	prom_printf("Applying EFIKA device tree fixups\n");
+
+	/* Claiming to be 'chrp' is death */
+	node = call_prom("finddevice", 1, 1, ADDR("/"));
+	rv = prom_getprop(node, "device_type", prop, sizeof(prop));
+	if (rv != PROM_ERROR && (prom_strcmp(prop, "chrp") == 0))
+		prom_setprop(node, "/", "device_type", "efika", sizeof("efika"));
+
+	/* CODEGEN,description is exposed in /proc/cpuinfo so
+	   fix that too */
+	rv = prom_getprop(node, "CODEGEN,description", prop, sizeof(prop));
+	if (rv != PROM_ERROR && (prom_strstr(prop, "CHRP")))
+		prom_setprop(node, "/", "CODEGEN,description",
+			     "Efika 5200B PowerPC System",
+			     sizeof("Efika 5200B PowerPC System"));
+
+	/* Fixup bestcomm interrupts property */
+	node = call_prom("finddevice", 1, 1, ADDR("/builtin/bestcomm"));
+	if (PHANDLE_VALID(node)) {
+		len = prom_getproplen(node, "interrupts");
+		if (len == 12) {
+			prom_printf("Fixing bestcomm interrupts property\n");
+			prom_setprop(node, "/builtin/bestcom", "interrupts",
+				     bcomm_irq, sizeof(bcomm_irq));
+		}
+	}
+
+	/* Fixup sound interrupts property */
+	node = call_prom("finddevice", 1, 1, ADDR("/builtin/sound"));
+	if (PHANDLE_VALID(node)) {
+		rv = prom_getprop(node, "interrupts", prop, sizeof(prop));
+		if (rv == PROM_ERROR) {
+			prom_printf("Adding sound interrupts property\n");
+			prom_setprop(node, "/builtin/sound", "interrupts",
+				     sound_irq, sizeof(sound_irq));
+		}
+	}
+
+	/* Make sure ethernet phy-handle property exists */
+	fixup_device_tree_efika_add_phy();
+}
+#else
+#define fixup_device_tree_efika()
+#endif
+
+#ifdef CONFIG_PPC_PASEMI_NEMO
+/*
+ * CFE supplied on Nemo is broken in several ways, biggest
+ * problem is that it reassigns ISA interrupts to unused mpic ints.
+ * Add an interrupt-controller property for the io-bridge to use
+ * and correct the ints so we can attach them to an irq_domain
+ */
+static void __init fixup_device_tree_pasemi(void)
+{
+	u32 interrupts[2], parent, rval, val = 0;
+	char *name, *pci_name;
+	phandle iob, node;
+
+	/* Find the root pci node */
+	name = "/pxp@0,e0000000";
+	iob = call_prom("finddevice", 1, 1, ADDR(name));
+	if (!PHANDLE_VALID(iob))
+		return;
+
+	/* check if interrupt-controller node set yet */
+	if (prom_getproplen(iob, "interrupt-controller") !=PROM_ERROR)
+		return;
+
+	prom_printf("adding interrupt-controller property for SB600...\n");
+
+	prom_setprop(iob, name, "interrupt-controller", &val, 0);
+
+	pci_name = "/pxp@0,e0000000/pci@11";
+	node = call_prom("finddevice", 1, 1, ADDR(pci_name));
+	parent = ADDR(iob);
+
+	for( ; prom_next_node(&node); ) {
+		/* scan each node for one with an interrupt */
+		if (!PHANDLE_VALID(node))
+			continue;
+
+		rval = prom_getproplen(node, "interrupts");
+		if (rval == 0 || rval == PROM_ERROR)
+			continue;
+
+		prom_getprop(node, "interrupts", &interrupts, sizeof(interrupts));
+		if ((interrupts[0] < 212) || (interrupts[0] > 222))
+			continue;
+
+		/* found a node, update both interrupts and interrupt-parent */
+		if ((interrupts[0] >= 212) && (interrupts[0] <= 215))
+			interrupts[0] -= 203;
+		if ((interrupts[0] >= 216) && (interrupts[0] <= 220))
+			interrupts[0] -= 213;
+		if (interrupts[0] == 221)
+			interrupts[0] = 14;
+		if (interrupts[0] == 222)
+			interrupts[0] = 8;
+
+		prom_setprop(node, pci_name, "interrupts", interrupts,
+					sizeof(interrupts));
+		prom_setprop(node, pci_name, "interrupt-parent", &parent,
+					sizeof(parent));
+	}
+
+	/*
+	 * The io-bridge has device_type set to 'io-bridge' change it to 'isa'
+	 * so that generic isa-bridge code can add the SB600 and its on-board
+	 * peripherals.
+	 */
+	name = "/pxp@0,e0000000/io-bridge@0";
+	iob = call_prom("finddevice", 1, 1, ADDR(name));
+	if (!PHANDLE_VALID(iob))
+		return;
+
+	/* device_type is already set, just change it. */
+
+	prom_printf("Changing device_type of SB600 node...\n");
+
+	prom_setprop(iob, name, "device_type", "isa", sizeof("isa"));
+}
+#else	/* !CONFIG_PPC_PASEMI_NEMO */
+static inline void fixup_device_tree_pasemi(void) { }
+#endif
+
+static void __init fixup_device_tree(void)
+{
+	fixup_device_tree_maple();
+	fixup_device_tree_maple_memory_controller();
+	fixup_device_tree_chrp();
+	fixup_device_tree_pmac();
+	fixup_device_tree_efika();
+	fixup_device_tree_pasemi();
+}
+
+static void __init prom_find_boot_cpu(void)
+{
+	__be32 rval;
+	ihandle prom_cpu;
+	phandle cpu_pkg;
+
+	rval = 0;
+	if (prom_getprop(prom.chosen, "cpu", &rval, sizeof(rval)) <= 0)
+		return;
+	prom_cpu = be32_to_cpu(rval);
+
+	cpu_pkg = call_prom("instance-to-package", 1, 1, prom_cpu);
+
+	if (!PHANDLE_VALID(cpu_pkg))
+		return;
+
+	prom_getprop(cpu_pkg, "reg", &rval, sizeof(rval));
+	prom.cpu = be32_to_cpu(rval);
+
+	prom_debug("Booting CPU hw index = %d\n", prom.cpu);
+}
+
+static void __init prom_check_initrd(unsigned long r3, unsigned long r4)
+{
+#ifdef CONFIG_BLK_DEV_INITRD
+	if (r3 && r4 && r4 != 0xdeadbeef) {
+		__be64 val;
+
+		prom_initrd_start = is_kernel_addr(r3) ? __pa(r3) : r3;
+		prom_initrd_end = prom_initrd_start + r4;
+
+		val = cpu_to_be64(prom_initrd_start);
+		prom_setprop(prom.chosen, "/chosen", "linux,initrd-start",
+			     &val, sizeof(val));
+		val = cpu_to_be64(prom_initrd_end);
+		prom_setprop(prom.chosen, "/chosen", "linux,initrd-end",
+			     &val, sizeof(val));
+
+		reserve_mem(prom_initrd_start,
+			    prom_initrd_end - prom_initrd_start);
+
+		prom_debug("initrd_start=0x%lx\n", prom_initrd_start);
+		prom_debug("initrd_end=0x%lx\n", prom_initrd_end);
+	}
+#endif /* CONFIG_BLK_DEV_INITRD */
+}
+
+#ifdef CONFIG_PPC_SVM
+/*
+ * Perform the Enter Secure Mode ultracall.
+ */
+static int __init enter_secure_mode(unsigned long kbase, unsigned long fdt)
+{
+	register unsigned long r3 asm("r3") = UV_ESM;
+	register unsigned long r4 asm("r4") = kbase;
+	register unsigned long r5 asm("r5") = fdt;
+
+	asm volatile("sc 2" : "+r"(r3) : "r"(r4), "r"(r5));
+
+	return r3;
+}
+
+/*
+ * Call the Ultravisor to transfer us to secure memory if we have an ESM blob.
+ */
+static void __init setup_secure_guest(unsigned long kbase, unsigned long fdt)
+{
+	int ret;
+
+	if (!prom_svm_enable)
+		return;
+
+	/* Switch to secure mode. */
+	prom_printf("Switching to secure mode.\n");
+
+	/*
+	 * The ultravisor will do an integrity check of the kernel image but we
+	 * relocated it so the check will fail. Restore the original image by
+	 * relocating it back to the kernel virtual base address.
+	 */
+	relocate(KERNELBASE);
+
+	ret = enter_secure_mode(kbase, fdt);
+
+	/* Relocate the kernel again. */
+	relocate(kbase);
+
+	if (ret != U_SUCCESS) {
+		prom_printf("Returned %d from switching to secure mode.\n", ret);
+		prom_rtas_os_term("Switch to secure mode failed.\n");
+	}
+}
+#else
+static void __init setup_secure_guest(unsigned long kbase, unsigned long fdt)
+{
+}
+#endif /* CONFIG_PPC_SVM */
+
+/*
+ * 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 kbase)
+{	
+	unsigned long hdr;
+
+#ifdef CONFIG_PPC32
+	unsigned long offset = reloc_offset();
+	reloc_got2(offset);
+#endif
+
+	/*
+	 * First zero the BSS
+	 */
+	memset(&__bss_start, 0, __bss_stop - __bss_start);
+
+	/*
+	 * Init interface to Open Firmware, get some node references,
+	 * like /chosen
+	 */
+	prom_init_client_services(pp);
+
+	/*
+	 * See if this OF is old enough that we need to do explicit maps
+	 * and other workarounds
+	 */
+	prom_find_mmu();
+
+	/*
+	 * Init prom stdout device
+	 */
+	prom_init_stdout();
+
+	prom_printf("Preparing to boot %s", linux_banner);
+
+	/*
+	 * Get default machine type. At this point, we do not differentiate
+	 * between pSeries SMP and pSeries LPAR
+	 */
+	of_platform = prom_find_machine_type();
+	prom_printf("Detected machine type: %x\n", of_platform);
+
+#ifndef CONFIG_NONSTATIC_KERNEL
+	/* Bail if this is a kdump kernel. */
+	if (PHYSICAL_START > 0)
+		prom_panic("Error: You can't boot a kdump kernel from OF!\n");
+#endif
+
+	/*
+	 * Check for an initrd
+	 */
+	prom_check_initrd(r3, r4);
+
+	/*
+	 * Do early parsing of command line
+	 */
+	early_cmdline_parse();
+
+#ifdef CONFIG_PPC_PSERIES
+	/*
+	 * On pSeries, inform the firmware about our capabilities
+	 */
+	if (of_platform == PLATFORM_PSERIES ||
+	    of_platform == PLATFORM_PSERIES_LPAR)
+		prom_send_capabilities();
+#endif
+
+	/*
+	 * Copy the CPU hold code
+	 */
+	if (of_platform != PLATFORM_POWERMAC)
+		copy_and_flush(0, kbase, 0x100, 0);
+
+	/*
+	 * 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();
+
+#if defined(CONFIG_PPC64) && defined(__BIG_ENDIAN__)
+	/*
+	 * 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 (of_platform == PLATFORM_PSERIES)
+		prom_initialize_tce_table();
+#endif
+
+	/*
+	 * On non-powermacs, try to instantiate RTAS. PowerMacs don't
+	 * have a usable RTAS implementation.
+	 */
+	if (of_platform != PLATFORM_POWERMAC)
+		prom_instantiate_rtas();
+
+#ifdef CONFIG_PPC64
+	/* instantiate sml */
+	prom_instantiate_sml();
+#endif
+
+	/*
+	 * On non-powermacs, put all CPUs in spin-loops.
+	 *
+	 * PowerMacs use a different mechanism to spin CPUs
+	 *
+	 * (This must be done after instantiating RTAS)
+	 */
+	if (of_platform != PLATFORM_POWERMAC)
+		prom_hold_cpus();
+
+	/*
+	 * Fill in some infos for use by the kernel later on
+	 */
+	if (prom_memory_limit) {
+		__be64 val = cpu_to_be64(prom_memory_limit);
+		prom_setprop(prom.chosen, "/chosen", "linux,memory-limit",
+			     &val, sizeof(val));
+	}
+#ifdef CONFIG_PPC64
+	if (prom_iommu_off)
+		prom_setprop(prom.chosen, "/chosen", "linux,iommu-off",
+			     NULL, 0);
+
+	if (prom_iommu_force_on)
+		prom_setprop(prom.chosen, "/chosen", "linux,iommu-force-on",
+			     NULL, 0);
+
+	if (prom_tce_alloc_start) {
+		prom_setprop(prom.chosen, "/chosen", "linux,tce-alloc-start",
+			     &prom_tce_alloc_start,
+			     sizeof(prom_tce_alloc_start));
+		prom_setprop(prom.chosen, "/chosen", "linux,tce-alloc-end",
+			     &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...
+	 * Unfortunately quiesce crashes on some powermacs if we have
+	 * closed stdin already (in particular the powerbook 101).
+	 */
+	if (of_platform != PLATFORM_POWERMAC)
+		prom_close_stdin();
+
+	/*
+	 * Call OF "quiesce" method to shut down pending DMA's from
+	 * devices etc...
+	 */
+	prom_printf("Quiescing Open Firmware ...\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 = dt_header_start;
+
+	prom_printf("Booting Linux via __start() @ 0x%lx ...\n", kbase);
+	prom_debug("->dt_header_start=0x%lx\n", hdr);
+
+#ifdef CONFIG_PPC32
+	reloc_got2(-offset);
+#endif
+
+	/* Move to secure memory if we're supposed to be secure guests. */
+	setup_secure_guest(kbase, hdr);
+
+	__start(hdr, kbase, 0, 0, 0, 0, 0);
+
+	return 0;
+}