powerpc: Move ppc64 boot wrapper code over to arch/powerpc

This also extends the code to handle 32-bit ELF vmlinux files as well
as 64-bit ones.  This is sufficient for booting on new-world 32-bit
powermacs (i.e. all recent machines).

Signed-off-by: Paul Mackerras <paulus@samba.org>

18 files changed, 2220 insertions, 18 deletions

diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
index d41ad2e675d..99dbea8c5c5 100644
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -14,10 +14,6 @@
 
 HAS_BIARCH	:= $(call cc-option-yn, -m32)
 
-ifeq ($(CONFIG_PPC64),y)
-OLDARCH	:= ppc64
-SZ	:= 64
-
 # Set default 32 bits cross compilers for vdso and boot wrapper
 CROSS32_COMPILE ?=
 
@@ -37,6 +33,10 @@ endif
 
 export CROSS32CC CROSS32AS CROSS32LD CROSS32OBJCOPY
 
+ifeq ($(CONFIG_PPC64),y)
+OLDARCH	:= ppc64
+SZ	:= 64
+
 new_nm := $(shell if $(NM) --help 2>&1 | grep -- '--synthetic' > /dev/null; then echo y; else echo n; fi)
 
 ifeq ($(new_nm),y)
@@ -139,7 +139,7 @@ drivers-$(CONFIG_CPM2)		+= arch/ppc/8260_io/
 
 drivers-$(CONFIG_OPROFILE)	+= arch/powerpc/oprofile/
 
-defaultimage-$(CONFIG_PPC32)	:= uImage zImage
+defaultimage-$(CONFIG_PPC32)	:= zImage
 defaultimage-$(CONFIG_PPC_ISERIES) := vmlinux
 defaultimage-$(CONFIG_PPC_PSERIES) := zImage
 KBUILD_IMAGE := $(defaultimage-y)
@@ -154,23 +154,13 @@ BOOT_TARGETS = zImage zImage.initrd znetboot znetboot.initrd vmlinux.sm
 
 .PHONY: $(BOOT_TARGETS)
 
-boot := arch/$(OLDARCH)/boot
+boot := arch/$(ARCH)/boot
 
-# urk
-ifeq ($(CONFIG_PPC64),y)
 $(BOOT_TARGETS): vmlinux
 	$(Q)$(MAKE) ARCH=ppc64 $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
-else
-$(BOOT_TARGETS): vmlinux
-	$(Q)$(MAKE) ARCH=ppc $(build)=$(boot) $@
-endif
-
-uImage: vmlinux
-	$(Q)$(MAKE) ARCH=$(OLDARCH) $(build)=$(boot)/images $(boot)/images/$@
 
 define archhelp
-  @echo '* zImage          - Compressed kernel image (arch/$(ARCH)/boot/images/zImage.*)'
-  @echo '  uImage          - Create a bootable image for U-Boot / PPCBoot'
+  @echo '* zImage          - Compressed kernel image (arch/$(ARCH)/boot/zImage.*)'
   @echo '  install         - Install kernel using'
   @echo '                    (your) ~/bin/installkernel or'
   @echo '                    (distribution) /sbin/installkernel or'
@@ -180,7 +170,6 @@ endef
 
 archclean:
 	$(Q)$(MAKE) $(clean)=$(boot)
-	# Temporary hack until we have migrated to asm-powerpc
 	$(Q)rm -rf arch/$(ARCH)/include
 
 archprepare: checkbin
diff --git a/arch/powerpc/boot/Makefile b/arch/powerpc/boot/Makefile
new file mode 100644
index 00000000000..9770f587af7
--- /dev/null
+++ b/arch/powerpc/boot/Makefile
@@ -0,0 +1,149 @@
+# Makefile for making ELF bootable images for booting on CHRP
+# using Open Firmware.
+#
+# Geert Uytterhoeven	September 1997
+#
+# Based on coffboot by Paul Mackerras
+# Simplified for ppc64 by Todd Inglett
+#
+# NOTE:	this code is built for 32 bit in ELF32 format even though
+#	it packages a 64 bit kernel.  We do this to simplify the
+#	bootloader and increase compatibility with OpenFirmware.
+#
+#	To this end we need to define BOOTCC, etc, as the tools
+#	needed to build the 32 bit image.  These are normally HOSTCC,
+#	but may be a third compiler if, for example, you are cross
+#	compiling from an intel box.  Once the 64bit ppc gcc is
+#	stable it will probably simply be a compiler switch to
+#	compile for 32bit mode.
+#	To make it easier to setup a cross compiler,
+#	CROSS32_COMPILE is setup as a prefix just like CROSS_COMPILE
+#	in the toplevel makefile.
+
+
+HOSTCC		:= gcc
+BOOTCFLAGS	:= $(HOSTCFLAGS) -fno-builtin -nostdinc -isystem \
+		   $(shell $(CROSS32CC) -print-file-name=include) -fPIC
+BOOTAFLAGS	:= -D__ASSEMBLY__ $(BOOTCFLAGS) -traditional -nostdinc
+BOOTLFLAGS	:= -T $(srctree)/$(src)/zImage.lds
+OBJCOPYFLAGS    := contents,alloc,load,readonly,data
+
+zlib       := infblock.c infcodes.c inffast.c inflate.c inftrees.c infutil.c
+zlibheader := infblock.h infcodes.h inffast.h inftrees.h infutil.h
+zliblinuxheader := zlib.h zconf.h zutil.h
+
+$(addprefix $(obj)/,$(zlib) main.o): $(addprefix $(obj)/,$(zliblinuxheader)) $(addprefix $(obj)/,$(zlibheader))
+#$(addprefix $(obj)/,main.o): $(addprefix $(obj)/,zlib.h)
+
+src-boot := string.S prom.c main.c div64.S crt0.S
+src-boot += $(zlib)
+src-boot := $(addprefix $(obj)/, $(src-boot))
+obj-boot := $(addsuffix .o, $(basename $(src-boot)))
+
+BOOTCFLAGS	+= -I$(obj) -I$(srctree)/$(obj)
+
+quiet_cmd_copy_zlib = COPY    $@
+      cmd_copy_zlib = sed "s@__attribute_used__@@;s@<linux/\([^>]\+\).*@\"\1\"@" $< > $@
+
+quiet_cmd_copy_zlibheader = COPY    $@
+      cmd_copy_zlibheader = sed "s@<linux/\([^>]\+\).*@\"\1\"@" $< > $@
+# stddef.h for NULL
+quiet_cmd_copy_zliblinuxheader = COPY    $@
+      cmd_copy_zliblinuxheader = sed "s@<linux/string.h>@\"string.h\"@;s@<linux/kernel.h>@<stddef.h>@;s@<linux/\([^>]\+\).*@\"\1\"@" $< > $@
+
+$(addprefix $(obj)/,$(zlib)): $(obj)/%: $(srctree)/lib/zlib_inflate/%
+	$(call cmd,copy_zlib)
+
+$(addprefix $(obj)/,$(zlibheader)): $(obj)/%: $(srctree)/lib/zlib_inflate/%
+	$(call cmd,copy_zlibheader)
+
+$(addprefix $(obj)/,$(zliblinuxheader)): $(obj)/%: $(srctree)/include/linux/%
+	$(call cmd,copy_zliblinuxheader)
+
+clean-files := $(zlib) $(zlibheader) $(zliblinuxheader)
+
+
+quiet_cmd_bootcc = BOOTCC  $@
+      cmd_bootcc = $(CROSS32CC) -Wp,-MD,$(depfile) $(BOOTCFLAGS) -c -o $@ $<
+
+quiet_cmd_bootas = BOOTAS  $@
+      cmd_bootas = $(CROSS32CC) -Wp,-MD,$(depfile) $(BOOTAFLAGS) -c -o $@ $<
+
+quiet_cmd_bootld = BOOTLD  $@
+      cmd_bootld = $(CROSS32LD) $(BOOTLFLAGS) -o $@ $(2)
+
+$(patsubst %.c,%.o, $(filter %.c, $(src-boot))): %.o: %.c
+	$(call if_changed_dep,bootcc)
+$(patsubst %.S,%.o, $(filter %.S, $(src-boot))): %.o: %.S
+	$(call if_changed_dep,bootas)
+
+#-----------------------------------------------------------
+# ELF sections within the zImage bootloader/wrapper
+#-----------------------------------------------------------
+required := vmlinux.strip
+initrd   := initrd
+
+obj-sec = $(foreach section, $(1), $(patsubst %,$(obj)/kernel-%.o, $(section)))
+src-sec = $(foreach section, $(1), $(patsubst %,$(obj)/kernel-%.c, $(section)))
+gz-sec  = $(foreach section, $(1), $(patsubst %,$(obj)/kernel-%.gz, $(section)))
+
+hostprogs-y		:= addnote addRamDisk
+targets 		+= zImage.vmode zImage.initrd.vmode zImage zImage.initrd \
+			   $(patsubst $(obj)/%,%, $(call obj-sec, $(required) $(initrd))) \
+			   $(patsubst $(obj)/%,%, $(call src-sec, $(required) $(initrd))) \
+			   $(patsubst $(obj)/%,%, $(call gz-sec, $(required) $(initrd))) \
+			   vmlinux.initrd
+extra-y			:= initrd.o
+
+quiet_cmd_ramdisk = RAMDISK $@
+      cmd_ramdisk = $(obj)/addRamDisk $(obj)/ramdisk.image.gz $< $@
+
+quiet_cmd_stripvm = STRIP   $@
+      cmd_stripvm = $(STRIP) -s -R .comment $< -o $@
+
+vmlinux.strip: vmlinux
+	$(call if_changed,stripvm)
+$(obj)/vmlinux.initrd: vmlinux.strip $(obj)/addRamDisk $(obj)/ramdisk.image.gz
+	$(call if_changed,ramdisk)
+
+quiet_cmd_addsection = ADDSEC  $@
+      cmd_addsection = $(CROSS32OBJCOPY) $@ \
+		--add-section=.kernel:$(strip $(patsubst $(obj)/kernel-%.o,%, $@))=$(patsubst %.o,%.gz, $@) \
+		--set-section-flags=.kernel:$(strip $(patsubst $(obj)/kernel-%.o,%, $@))=$(OBJCOPYFLAGS)
+
+quiet_cmd_addnote = ADDNOTE $@
+      cmd_addnote = $(obj)/addnote $@
+
+$(call gz-sec, $(required)): $(obj)/kernel-%.gz: %
+	$(call if_changed,gzip)
+
+$(obj)/kernel-initrd.gz: $(obj)/ramdisk.image.gz
+	cp -f $(obj)/ramdisk.image.gz $@
+
+$(call src-sec, $(required) $(initrd)): $(obj)/kernel-%.c: $(obj)/kernel-%.gz
+	@touch $@
+
+$(call obj-sec, $(required) $(initrd)): $(obj)/kernel-%.o: $(obj)/kernel-%.c
+	$(call if_changed_dep,bootcc)
+	$(call cmd,addsection)
+
+$(obj)/zImage.vmode: obj-boot += $(call obj-sec, $(required))
+$(obj)/zImage.vmode: $(call obj-sec, $(required)) $(obj-boot) $(srctree)/$(src)/zImage.lds
+	$(call cmd,bootld,$(obj-boot))
+
+$(obj)/zImage.initrd.vmode: obj-boot += $(call obj-sec, $(required) $(initrd))
+$(obj)/zImage.initrd.vmode: $(call obj-sec, $(required) $(initrd)) $(obj-boot) $(srctree)/$(src)/zImage.lds
+	$(call cmd,bootld,$(obj-boot))
+
+$(obj)/zImage: $(obj)/zImage.vmode $(obj)/addnote
+	@cp -f $< $@
+	$(call if_changed,addnote)
+
+$(obj)/zImage.initrd: $(obj)/zImage.initrd.vmode $(obj)/addnote
+	@cp -f $< $@
+	$(call if_changed,addnote)
+
+install: $(CONFIGURE) $(BOOTIMAGE)
+	sh -x $(srctree)/$(src)/install.sh "$(KERNELRELEASE)" vmlinux System.map "$(INSTALL_PATH)" "$(BOOTIMAGE)"
+
+clean-files := $(addprefix $(objtree)/, $(obj-boot) vmlinux.strip)
diff --git a/arch/powerpc/boot/README b/arch/powerpc/boot/README
new file mode 100644
index 00000000000..3e11058760e
--- /dev/null
+++ b/arch/powerpc/boot/README
@@ -0,0 +1,11 @@
+
+To extract the kernel vmlinux, System.map, .config or initrd from the zImage binary:
+
+objcopy -j .kernel:vmlinux -O binary zImage vmlinux.gz
+objcopy -j .kernel:System.map -O binary zImage System.map.gz
+objcopy -j .kernel:.config -O binary zImage config.gz
+objcopy -j .kernel:initrd -O binary zImage.initrd initrd.gz
+
+
+	Peter
+
diff --git a/arch/powerpc/boot/addRamDisk.c b/arch/powerpc/boot/addRamDisk.c
new file mode 100644
index 00000000000..c02a99952be
--- /dev/null
+++ b/arch/powerpc/boot/addRamDisk.c
@@ -0,0 +1,311 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <netinet/in.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <string.h>
+#include <elf.h>
+
+#define ElfHeaderSize  (64 * 1024)
+#define ElfPages  (ElfHeaderSize / 4096)
+#define KERNELBASE (0xc000000000000000)
+#define _ALIGN_UP(addr,size)	(((addr)+((size)-1))&(~((size)-1)))
+
+struct addr_range {
+	unsigned long long addr;
+	unsigned long memsize;
+	unsigned long offset;
+};
+
+static int check_elf64(void *p, int size, struct addr_range *r)
+{
+	Elf64_Ehdr *elf64 = p;
+	Elf64_Phdr *elf64ph;
+
+	if (elf64->e_ident[EI_MAG0] != ELFMAG0 ||
+	    elf64->e_ident[EI_MAG1] != ELFMAG1 ||
+	    elf64->e_ident[EI_MAG2] != ELFMAG2 ||
+	    elf64->e_ident[EI_MAG3] != ELFMAG3 ||
+	    elf64->e_ident[EI_CLASS] != ELFCLASS64 ||
+	    elf64->e_ident[EI_DATA] != ELFDATA2MSB ||
+	    elf64->e_type != ET_EXEC || elf64->e_machine != EM_PPC64)
+		return 0;
+
+	if ((elf64->e_phoff + sizeof(Elf64_Phdr)) > size)
+		return 0;
+
+	elf64ph = (Elf64_Phdr *) ((unsigned long)elf64 +
+				  (unsigned long)elf64->e_phoff);
+
+	r->memsize = (unsigned long)elf64ph->p_memsz;
+	r->offset = (unsigned long)elf64ph->p_offset;
+	r->addr = (unsigned long long)elf64ph->p_vaddr;
+
+#ifdef DEBUG
+	printf("PPC64 ELF file, ph:\n");
+	printf("p_type   0x%08x\n", elf64ph->p_type);
+	printf("p_flags  0x%08x\n", elf64ph->p_flags);
+	printf("p_offset 0x%016llx\n", elf64ph->p_offset);
+	printf("p_vaddr  0x%016llx\n", elf64ph->p_vaddr);
+	printf("p_paddr  0x%016llx\n", elf64ph->p_paddr);
+	printf("p_filesz 0x%016llx\n", elf64ph->p_filesz);
+	printf("p_memsz  0x%016llx\n", elf64ph->p_memsz);
+	printf("p_align  0x%016llx\n", elf64ph->p_align);
+	printf("... skipping 0x%08lx bytes of ELF header\n",
+	       (unsigned long)elf64ph->p_offset);
+#endif
+
+	return 64;
+}
+void get4k(FILE *file, char *buf )
+{
+	unsigned j;
+	unsigned num = fread(buf, 1, 4096, file);
+	for ( j=num; j<4096; ++j )
+		buf[j] = 0;
+}
+
+void put4k(FILE *file, char *buf )
+{
+	fwrite(buf, 1, 4096, file);
+}
+
+void death(const char *msg, FILE *fdesc, const char *fname) 
+{
+	fprintf(stderr, msg);
+	fclose(fdesc);
+	unlink(fname);
+	exit(1);
+}
+
+int main(int argc, char **argv)
+{
+	char inbuf[4096];
+	struct addr_range vmlinux;
+	FILE *ramDisk;
+	FILE *inputVmlinux;
+	FILE *outputVmlinux;
+
+	char *rd_name, *lx_name, *out_name;
+
+	size_t i;
+	unsigned long ramFileLen;
+	unsigned long ramLen;
+	unsigned long roundR;
+	unsigned long offset_end;
+
+	unsigned long kernelLen;
+	unsigned long actualKernelLen;
+	unsigned long round;
+	unsigned long roundedKernelLen;
+	unsigned long ramStartOffs;
+	unsigned long ramPages;
+	unsigned long roundedKernelPages;
+	unsigned long hvReleaseData;
+	u_int32_t eyeCatcher = 0xc8a5d9c4;
+	unsigned long naca;
+	unsigned long xRamDisk;
+	unsigned long xRamDiskSize;
+	long padPages;
+  
+  
+	if (argc < 2) {
+		fprintf(stderr, "Name of RAM disk file missing.\n");
+		exit(1);
+	}
+	rd_name = argv[1];
+
+	if (argc < 3) {
+		fprintf(stderr, "Name of vmlinux file missing.\n");
+		exit(1);
+	}
+	lx_name = argv[2];
+
+	if (argc < 4) {
+		fprintf(stderr, "Name of vmlinux output file missing.\n");
+		exit(1);
+	}
+	out_name = argv[3];
+
+
+	ramDisk = fopen(rd_name, "r");
+	if ( ! ramDisk ) {
+		fprintf(stderr, "RAM disk file \"%s\" failed to open.\n", rd_name);
+		exit(1);
+	}
+
+	inputVmlinux = fopen(lx_name, "r");
+	if ( ! inputVmlinux ) {
+		fprintf(stderr, "vmlinux file \"%s\" failed to open.\n", lx_name);
+		exit(1);
+	}
+  
+	outputVmlinux = fopen(out_name, "w+");
+	if ( ! outputVmlinux ) {
+		fprintf(stderr, "output vmlinux file \"%s\" failed to open.\n", out_name);
+		exit(1);
+	}
+
+	i = fread(inbuf, 1, sizeof(inbuf), inputVmlinux);
+	if (i != sizeof(inbuf)) {
+		fprintf(stderr, "can not read vmlinux file %s: %u\n", lx_name, i);
+		exit(1);
+	}
+
+	i = check_elf64(inbuf, sizeof(inbuf), &vmlinux);
+	if (i == 0) {
+		fprintf(stderr, "You must have a linux kernel specified as argv[2]\n");
+		exit(1);
+	}
+
+	/* Input Vmlinux file */
+	fseek(inputVmlinux, 0, SEEK_END);
+	kernelLen = ftell(inputVmlinux);
+	fseek(inputVmlinux, 0, SEEK_SET);
+	printf("kernel file size = %lu\n", kernelLen);
+
+	actualKernelLen = kernelLen - ElfHeaderSize;
+
+	printf("actual kernel length (minus ELF header) = %lu\n", actualKernelLen);
+
+	round = actualKernelLen % 4096;
+	roundedKernelLen = actualKernelLen;
+	if ( round )
+		roundedKernelLen += (4096 - round);
+	printf("Vmlinux length rounded up to a 4k multiple = %ld/0x%lx \n", roundedKernelLen, roundedKernelLen);
+	roundedKernelPages = roundedKernelLen / 4096;
+	printf("Vmlinux pages to copy = %ld/0x%lx \n", roundedKernelPages, roundedKernelPages);
+
+	offset_end = _ALIGN_UP(vmlinux.memsize, 4096);
+	/* calc how many pages we need to insert between the vmlinux and the start of the ram disk */
+	padPages = offset_end/4096 - roundedKernelPages;
+
+	/* Check and see if the vmlinux is already larger than _end in System.map */
+	if (padPages < 0) {
+		/* vmlinux is larger than _end - adjust the offset to the start of the embedded ram disk */ 
+		offset_end = roundedKernelLen;
+		printf("vmlinux is larger than _end indicates it needs to be - offset_end = %lx \n", offset_end);
+		padPages = 0;
+		printf("will insert %lx pages between the vmlinux and the start of the ram disk \n", padPages);
+	}
+	else {
+		/* _end is larger than vmlinux - use the offset to _end that we calculated from the system map */
+		printf("vmlinux is smaller than _end indicates is needed - offset_end = %lx \n", offset_end);
+		printf("will insert %lx pages between the vmlinux and the start of the ram disk \n", padPages);
+	}
+
+
+
+	/* Input Ram Disk file */
+	// Set the offset that the ram disk will be started at.
+	ramStartOffs = offset_end;  /* determined from the input vmlinux file and the system map */
+	printf("Ram Disk will start at offset = 0x%lx \n", ramStartOffs);
+  
+	fseek(ramDisk, 0, SEEK_END);
+	ramFileLen = ftell(ramDisk);
+	fseek(ramDisk, 0, SEEK_SET);
+	printf("%s file size = %ld/0x%lx \n", rd_name, ramFileLen, ramFileLen);
+
+	ramLen = ramFileLen;
+
+	roundR = 4096 - (ramLen % 4096);
+	if ( roundR ) {
+		printf("Rounding RAM disk file up to a multiple of 4096, adding %ld/0x%lx \n", roundR, roundR);
+		ramLen += roundR;
+	}
+
+	printf("Rounded RAM disk size is %ld/0x%lx \n", ramLen, ramLen);
+	ramPages = ramLen / 4096;
+	printf("RAM disk pages to copy = %ld/0x%lx\n", ramPages, ramPages);
+
+
+
+  // Copy 64K ELF header
+	for (i=0; i<(ElfPages); ++i) {
+		get4k( inputVmlinux, inbuf );
+		put4k( outputVmlinux, inbuf );
+	}
+
+	/* Copy the vmlinux (as full pages). */
+	fseek(inputVmlinux, ElfHeaderSize, SEEK_SET);
+	for ( i=0; i<roundedKernelPages; ++i ) {
+		get4k( inputVmlinux, inbuf );
+		put4k( outputVmlinux, inbuf );
+	}
+  
+	/* Insert pad pages (if appropriate) that are needed between */
+	/* | the end of the vmlinux and the ram disk. */
+	for (i=0; i<padPages; ++i) {
+		memset(inbuf, 0, 4096);
+		put4k(outputVmlinux, inbuf);
+	}
+
+	/* Copy the ram disk (as full pages). */
+	for ( i=0; i<ramPages; ++i ) {
+		get4k( ramDisk, inbuf );
+		put4k( outputVmlinux, inbuf );
+	}
+
+	/* Close the input files */
+	fclose(ramDisk);
+	fclose(inputVmlinux);
+	/* And flush the written output file */
+	fflush(outputVmlinux);
+
+
+
+	/* Fixup the new vmlinux to contain the ram disk starting offset (xRamDisk) and the ram disk size (xRamDiskSize) */
+	/* fseek to the hvReleaseData pointer */
+	fseek(outputVmlinux, ElfHeaderSize + 0x24, SEEK_SET);
+	if (fread(&hvReleaseData, 4, 1, outputVmlinux) != 1) {
+		death("Could not read hvReleaseData pointer\n", outputVmlinux, out_name);
+	}
+	hvReleaseData = ntohl(hvReleaseData); /* Convert to native int */
+	printf("hvReleaseData is at %08lx\n", hvReleaseData);
+
+	/* fseek to the hvReleaseData */
+	fseek(outputVmlinux, ElfHeaderSize + hvReleaseData, SEEK_SET);
+	if (fread(inbuf, 0x40, 1, outputVmlinux) != 1) {
+		death("Could not read hvReleaseData\n", outputVmlinux, out_name);
+	}
+	/* Check hvReleaseData sanity */
+	if (memcmp(inbuf, &eyeCatcher, 4) != 0) {
+		death("hvReleaseData is invalid\n", outputVmlinux, out_name);
+	}
+	/* Get the naca pointer */
+	naca = ntohl(*((u_int32_t*) &inbuf[0x0C])) - KERNELBASE;
+	printf("Naca is at offset 0x%lx \n", naca);
+
+	/* fseek to the naca */
+	fseek(outputVmlinux, ElfHeaderSize + naca, SEEK_SET);
+	if (fread(inbuf, 0x18, 1, outputVmlinux) != 1) {
+		death("Could not read naca\n", outputVmlinux, out_name);
+	}
+	xRamDisk = ntohl(*((u_int32_t *) &inbuf[0x0c]));
+	xRamDiskSize = ntohl(*((u_int32_t *) &inbuf[0x14]));
+	/* Make sure a RAM disk isn't already present */
+	if ((xRamDisk != 0) || (xRamDiskSize != 0)) {
+		death("RAM disk is already attached to this kernel\n", outputVmlinux, out_name);
+	}
+	/* Fill in the values */
+	*((u_int32_t *) &inbuf[0x0c]) = htonl(ramStartOffs);
+	*((u_int32_t *) &inbuf[0x14]) = htonl(ramPages);
+
+	/* Write out the new naca */
+	fflush(outputVmlinux);
+	fseek(outputVmlinux, ElfHeaderSize + naca, SEEK_SET);
+	if (fwrite(inbuf, 0x18, 1, outputVmlinux) != 1) {
+		death("Could not write naca\n", outputVmlinux, out_name);
+	}
+	printf("Ram Disk of 0x%lx pages is attached to the kernel at offset 0x%08lx\n",
+	       ramPages, ramStartOffs);
+
+	/* Done */
+	fclose(outputVmlinux);
+	/* Set permission to executable */
+	chmod(out_name, S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH);
+
+	return 0;
+}
+
diff --git a/arch/powerpc/boot/addnote.c b/arch/powerpc/boot/addnote.c
new file mode 100644
index 00000000000..8041a9845ab
--- /dev/null
+++ b/arch/powerpc/boot/addnote.c
@@ -0,0 +1,205 @@
+/*
+ * Program to hack in a PT_NOTE program header entry in an ELF file.
+ * This is needed for OF on RS/6000s to load an image correctly.
+ * Note that OF needs a program header entry for the note, not an
+ * ELF section.
+ *
+ * Copyright 2000 Paul Mackerras.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * Usage: addnote zImage
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <string.h>
+
+/* CHRP note section */
+char arch[] = "PowerPC";
+
+#define N_DESCR	6
+unsigned int descr[N_DESCR] = {
+	0xffffffff,		/* real-mode = true */
+	0x00c00000,		/* real-base, i.e. where we expect OF to be */
+	0xffffffff,		/* real-size */
+	0xffffffff,		/* virt-base */
+	0xffffffff,		/* virt-size */
+	0x4000,			/* load-base */
+};
+
+/* RPA note section */
+char rpaname[] = "IBM,RPA-Client-Config";
+
+/*
+ * Note: setting ignore_my_client_config *should* mean that OF ignores
+ * all the other fields, but there is a firmware bug which means that
+ * it looks at the splpar field at least.  So these values need to be
+ * reasonable.
+ */
+#define N_RPA_DESCR	8
+unsigned int rpanote[N_RPA_DESCR] = {
+	0,			/* lparaffinity */
+	64,			/* min_rmo_size */
+	0,			/* min_rmo_percent */
+	40,			/* max_pft_size */
+	1,			/* splpar */
+	-1,			/* min_load */
+	0,			/* new_mem_def */
+	1,			/* ignore_my_client_config */
+};
+
+#define ROUNDUP(len)	(((len) + 3) & ~3)
+
+unsigned char buf[512];
+
+#define GET_16BE(off)	((buf[off] << 8) + (buf[(off)+1]))
+#define GET_32BE(off)	((GET_16BE(off) << 16) + GET_16BE((off)+2))
+
+#define PUT_16BE(off, v)	(buf[off] = ((v) >> 8) & 0xff, \
+				 buf[(off) + 1] = (v) & 0xff)
+#define PUT_32BE(off, v)	(PUT_16BE((off), (v) >> 16), \
+				 PUT_16BE((off) + 2, (v)))
+
+/* Structure of an ELF file */
+#define E_IDENT		0	/* ELF header */
+#define	E_PHOFF		28
+#define E_PHENTSIZE	42
+#define E_PHNUM		44
+#define E_HSIZE		52	/* size of ELF header */
+
+#define EI_MAGIC	0	/* offsets in E_IDENT area */
+#define EI_CLASS	4
+#define EI_DATA		5
+
+#define PH_TYPE		0	/* ELF program header */
+#define PH_OFFSET	4
+#define PH_FILESZ	16
+#define PH_HSIZE	32	/* size of program header */
+
+#define PT_NOTE		4	/* Program header type = note */
+
+#define ELFCLASS32	1
+#define ELFDATA2MSB	2
+
+unsigned char elf_magic[4] = { 0x7f, 'E', 'L', 'F' };
+
+int
+main(int ac, char **av)
+{
+	int fd, n, i;
+	int ph, ps, np;
+	int nnote, nnote2, ns;
+
+	if (ac != 2) {
+		fprintf(stderr, "Usage: %s elf-file\n", av[0]);
+		exit(1);
+	}
+	fd = open(av[1], O_RDWR);
+	if (fd < 0) {
+		perror(av[1]);
+		exit(1);
+	}
+
+	nnote = 12 + ROUNDUP(strlen(arch) + 1) + sizeof(descr);
+	nnote2 = 12 + ROUNDUP(strlen(rpaname) + 1) + sizeof(rpanote);
+
+	n = read(fd, buf, sizeof(buf));
+	if (n < 0) {
+		perror("read");
+		exit(1);
+	}
+
+	if (n < E_HSIZE || memcmp(&buf[E_IDENT+EI_MAGIC], elf_magic, 4) != 0)
+		goto notelf;
+
+	if (buf[E_IDENT+EI_CLASS] != ELFCLASS32
+	    || buf[E_IDENT+EI_DATA] != ELFDATA2MSB) {
+		fprintf(stderr, "%s is not a big-endian 32-bit ELF image\n",
+			av[1]);
+		exit(1);
+	}
+
+	ph = GET_32BE(E_PHOFF);
+	ps = GET_16BE(E_PHENTSIZE);
+	np = GET_16BE(E_PHNUM);
+	if (ph < E_HSIZE || ps < PH_HSIZE || np < 1)
+		goto notelf;
+	if (ph + (np + 2) * ps + nnote + nnote2 > n)
+		goto nospace;
+
+	for (i = 0; i < np; ++i) {
+		if (GET_32BE(ph + PH_TYPE) == PT_NOTE) {
+			fprintf(stderr, "%s already has a note entry\n",
+				av[1]);
+			exit(0);
+		}
+		ph += ps;
+	}
+
+	/* XXX check that the area we want to use is all zeroes */
+	for (i = 0; i < 2 * ps + nnote + nnote2; ++i)
+		if (buf[ph + i] != 0)
+			goto nospace;
+
+	/* fill in the program header entry */
+	ns = ph + 2 * ps;
+	PUT_32BE(ph + PH_TYPE, PT_NOTE);
+	PUT_32BE(ph + PH_OFFSET, ns);
+	PUT_32BE(ph + PH_FILESZ, nnote);
+
+	/* fill in the note area we point to */
+	/* XXX we should probably make this a proper section */
+	PUT_32BE(ns, strlen(arch) + 1);
+	PUT_32BE(ns + 4, N_DESCR * 4);
+	PUT_32BE(ns + 8, 0x1275);
+	strcpy((char *) &buf[ns + 12], arch);
+	ns += 12 + strlen(arch) + 1;
+	for (i = 0; i < N_DESCR; ++i, ns += 4)
+		PUT_32BE(ns, descr[i]);
+
+	/* fill in the second program header entry and the RPA note area */
+	ph += ps;
+	PUT_32BE(ph + PH_TYPE, PT_NOTE);
+	PUT_32BE(ph + PH_OFFSET, ns);
+	PUT_32BE(ph + PH_FILESZ, nnote2);
+
+	/* fill in the note area we point to */
+	PUT_32BE(ns, strlen(rpaname) + 1);
+	PUT_32BE(ns + 4, sizeof(rpanote));
+	PUT_32BE(ns + 8, 0x12759999);
+	strcpy((char *) &buf[ns + 12], rpaname);
+	ns += 12 + ROUNDUP(strlen(rpaname) + 1);
+	for (i = 0; i < N_RPA_DESCR; ++i, ns += 4)
+		PUT_32BE(ns, rpanote[i]);
+
+	/* Update the number of program headers */
+	PUT_16BE(E_PHNUM, np + 2);
+
+	/* write back */
+	lseek(fd, (long) 0, SEEK_SET);
+	i = write(fd, buf, n);
+	if (i < 0) {
+		perror("write");
+		exit(1);
+	}
+	if (i < n) {
+		fprintf(stderr, "%s: write truncated\n", av[1]);
+		exit(1);
+	}
+
+	exit(0);
+
+ notelf:
+	fprintf(stderr, "%s does not appear to be an ELF file\n", av[1]);
+	exit(1);
+
+ nospace:
+	fprintf(stderr, "sorry, I can't find space in %s to put the note\n",
+		av[1]);
+	exit(1);
+}
diff --git a/arch/powerpc/boot/crt0.S b/arch/powerpc/boot/crt0.S
new file mode 100644
index 00000000000..9cc44226393
--- /dev/null
+++ b/arch/powerpc/boot/crt0.S
@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) Paul Mackerras 1997.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * NOTE: this code runs in 32 bit mode and is packaged as ELF32.
+ */
+
+#include "ppc_asm.h"
+
+	.text
+	.globl	_zimage_start
+_zimage_start:
+	bl	reloc_offset
+
+reloc_offset:
+	mflr	r0
+	lis	r9,reloc_offset@ha
+	addi	r9,r9,reloc_offset@l
+	subf.	r0,r9,r0
+	beq	clear_caches
+
+reloc_got2:
+	lis	r9,__got2_start@ha
+	addi	r9,r9,__got2_start@l
+	lis	r8,__got2_end@ha
+	addi	r8,r8,__got2_end@l
+	subf.	r8,r9,r8
+	beq	clear_caches
+	srwi.	r8,r8,2
+	mtctr	r8
+	add	r9,r0,r9
+reloc_got2_loop:
+	lwz	r8,0(r9)
+	add	r8,r8,r0
+	stw	r8,0(r9)
+	addi	r9,r9,4
+	bdnz	reloc_got2_loop
+
+clear_caches:
+	lis	r9,_start@h
+	add	r9,r0,r9
+	lis	r8,_etext@ha
+	addi	r8,r8,_etext@l
+	add	r8,r0,r8
+1:	dcbf	r0,r9
+	icbi	r0,r9
+	addi	r9,r9,0x20
+	cmplwi	0,r9,8
+	blt	1b
+	sync
+	isync
+
+	mr	r6,r1
+	b	start
+
diff --git a/arch/powerpc/boot/div64.S b/arch/powerpc/boot/div64.S
new file mode 100644
index 00000000000..722f360a32a
--- /dev/null
+++ b/arch/powerpc/boot/div64.S
@@ -0,0 +1,58 @@
+/*
+ * Divide a 64-bit unsigned number by a 32-bit unsigned number.
+ * This routine assumes that the top 32 bits of the dividend are
+ * non-zero to start with.
+ * On entry, r3 points to the dividend, which get overwritten with
+ * the 64-bit quotient, and r4 contains the divisor.
+ * On exit, r3 contains the remainder.
+ *
+ * Copyright (C) 2002 Paul Mackerras, IBM Corp.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+#include "ppc_asm.h"
+
+	.globl __div64_32
+__div64_32:
+	lwz	r5,0(r3)	# get the dividend into r5/r6
+	lwz	r6,4(r3)
+	cmplw	r5,r4
+	li	r7,0
+	li	r8,0
+	blt	1f
+	divwu	r7,r5,r4	# if dividend.hi >= divisor,
+	mullw	r0,r7,r4	# quotient.hi = dividend.hi / divisor
+	subf.	r5,r0,r5	# dividend.hi %= divisor
+	beq	3f
+1:	mr	r11,r5		# here dividend.hi != 0
+	andis.	r0,r5,0xc000
+	bne	2f
+	cntlzw	r0,r5		# we are shifting the dividend right
+	li	r10,-1		# to make it < 2^32, and shifting
+	srw	r10,r10,r0	# the divisor right the same amount,
+	add	r9,r4,r10	# rounding up (so the estimate cannot
+	andc	r11,r6,r10	# ever be too large, only too small)
+	andc	r9,r9,r10
+	or	r11,r5,r11
+	rotlw	r9,r9,r0
+	rotlw	r11,r11,r0
+	divwu	r11,r11,r9	# then we divide the shifted quantities
+2:	mullw	r10,r11,r4	# to get an estimate of the quotient,
+	mulhwu	r9,r11,r4	# multiply the estimate by the divisor,
+	subfc	r6,r10,r6	# take the product from the divisor,
+	add	r8,r8,r11	# and add the estimate to the accumulated
+	subfe.	r5,r9,r5	# quotient
+	bne	1b
+3:	cmplw	r6,r4
+	blt	4f
+	divwu	r0,r6,r4	# perform the remaining 32-bit division
+	mullw	r10,r0,r4	# and get the remainder
+	add	r8,r8,r0
+	subf	r6,r10,r6
+4:	stw	r7,0(r3)	# return the quotient in *r3
+	stw	r8,4(r3)
+	mr	r3,r6		# return the remainder in r3
+	blr
diff --git a/arch/powerpc/boot/elf.h b/arch/powerpc/boot/elf.h
new file mode 100644
index 00000000000..d4828fcf1cb
--- /dev/null
+++ b/arch/powerpc/boot/elf.h
@@ -0,0 +1,149 @@
+#ifndef _PPC_BOOT_ELF_H_
+#define _PPC_BOOT_ELF_H_
+
+/* 32-bit ELF base types. */
+typedef unsigned int Elf32_Addr;
+typedef unsigned short Elf32_Half;
+typedef unsigned int Elf32_Off;
+typedef signed int Elf32_Sword;
+typedef unsigned int Elf32_Word;
+
+/* 64-bit ELF base types. */
+typedef unsigned long long Elf64_Addr;
+typedef unsigned short Elf64_Half;
+typedef signed short Elf64_SHalf;
+typedef unsigned long long Elf64_Off;
+typedef signed int Elf64_Sword;
+typedef unsigned int Elf64_Word;
+typedef unsigned long long Elf64_Xword;
+typedef signed long long Elf64_Sxword;
+
+/* These constants are for the segment types stored in the image headers */
+#define PT_NULL    0
+#define PT_LOAD    1
+#define PT_DYNAMIC 2
+#define PT_INTERP  3
+#define PT_NOTE    4
+#define PT_SHLIB   5
+#define PT_PHDR    6
+#define PT_TLS     7		/* Thread local storage segment */
+#define PT_LOOS    0x60000000	/* OS-specific */
+#define PT_HIOS    0x6fffffff	/* OS-specific */
+#define PT_LOPROC  0x70000000
+#define PT_HIPROC  0x7fffffff
+#define PT_GNU_EH_FRAME		0x6474e550
+
+#define PT_GNU_STACK	(PT_LOOS + 0x474e551)
+
+/* These constants define the different elf file types */
+#define ET_NONE   0
+#define ET_REL    1
+#define ET_EXEC   2
+#define ET_DYN    3
+#define ET_CORE   4
+#define ET_LOPROC 0xff00
+#define ET_HIPROC 0xffff
+
+/* These constants define the various ELF target machines */
+#define EM_NONE  0
+#define EM_PPC	       20	/* PowerPC */
+#define EM_PPC64       21	/* PowerPC64 */
+
+#define EI_NIDENT	16
+
+typedef struct elf32_hdr {
+	unsigned char e_ident[EI_NIDENT];
+	Elf32_Half e_type;
+	Elf32_Half e_machine;
+	Elf32_Word e_version;
+	Elf32_Addr e_entry;	/* Entry point */
+	Elf32_Off e_phoff;
+	Elf32_Off e_shoff;
+	Elf32_Word e_flags;
+	Elf32_Half e_ehsize;
+	Elf32_Half e_phentsize;
+	Elf32_Half e_phnum;
+	Elf32_Half e_shentsize;
+	Elf32_Half e_shnum;
+	Elf32_Half e_shstrndx;
+} Elf32_Ehdr;
+
+typedef struct elf64_hdr {
+	unsigned char e_ident[16];	/* ELF "magic number" */
+	Elf64_Half e