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, 91 insertions, 61 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/ppc64/boot/Makefile b/arch/powerpc/boot/Makefile
index 301bc1536c4..9770f587af7 100644
--- a/arch/ppc64/boot/Makefile
+++ b/arch/powerpc/boot/Makefile
@@ -22,7 +22,8 @@
 
 
 HOSTCC          := gcc
-BOOTCFLAGS      := $(HOSTCFLAGS) -fno-builtin -nostdinc -isystem $(shell $(CROSS32CC) -print-file-name=include) -fPIC
+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
@@ -98,7 +99,7 @@ quiet_cmd_ramdisk = RAMDISK $@
       cmd_ramdisk = $(obj)/addRamDisk $(obj)/ramdisk.image.gz $< $@
 
 quiet_cmd_stripvm = STRIP   $@
-      cmd_stripvm = $(STRIP) -s $< -o $@
+      cmd_stripvm = $(STRIP) -s -R .comment $< -o $@
 
 vmlinux.strip: vmlinux
         $(call if_changed,stripvm)
diff --git a/arch/ppc64/boot/README b/arch/powerpc/boot/README
index 3e11058760e..3e11058760e 100644
--- a/arch/ppc64/boot/README
+++ b/arch/powerpc/boot/README
diff --git a/arch/ppc64/boot/addRamDisk.c b/arch/powerpc/boot/addRamDisk.c
index c02a99952be..c02a99952be 100644
--- a/arch/ppc64/boot/addRamDisk.c
+++ b/arch/powerpc/boot/addRamDisk.c
diff --git a/arch/ppc64/boot/addnote.c b/arch/powerpc/boot/addnote.c
index 8041a9845ab..8041a9845ab 100644
--- a/arch/ppc64/boot/addnote.c
+++ b/arch/powerpc/boot/addnote.c
diff --git a/arch/ppc64/boot/crt0.S b/arch/powerpc/boot/crt0.S
index 9cc44226393..9cc44226393 100644
--- a/arch/ppc64/boot/crt0.S
+++ b/arch/powerpc/boot/crt0.S
diff --git a/arch/ppc64/boot/div64.S b/arch/powerpc/boot/div64.S
index 722f360a32a..722f360a32a 100644
--- a/arch/ppc64/boot/div64.S
+++ b/arch/powerpc/boot/div64.S
diff --git a/arch/ppc64/boot/elf.h b/arch/powerpc/boot/elf.h
index d4828fcf1cb..d4828fcf1cb 100644
--- a/arch/ppc64/boot/elf.h
+++ b/arch/powerpc/boot/elf.h
diff --git a/arch/ppc64/boot/install.sh b/arch/powerpc/boot/install.sh
index eacce959081..eacce959081 100644
--- a/arch/ppc64/boot/install.sh
+++ b/arch/powerpc/boot/install.sh
diff --git a/arch/ppc64/boot/main.c b/arch/powerpc/boot/main.c
index e0dde24a72c..64ec93116fa 100644
--- a/arch/ppc64/boot/main.c
+++ b/arch/powerpc/boot/main.c
@@ -42,6 +42,8 @@ static struct addr_range vmlinux;
 static struct addr_range vmlinuz;
 static struct addr_range initrd;
 
+static unsigned long elfoffset;
+
 static char scratch[46912];     /* scratch space for gunzip, from zlib_inflate_workspacesize() */
 static char elfheader[256];
 
@@ -131,13 +133,70 @@ static unsigned long try_claim(unsigned long size)
         return addr;
 }
 
+static int is_elf64(void *hdr)
+{
+        Elf64_Ehdr *elf64 = hdr;
+        Elf64_Phdr *elf64ph;
+        unsigned int i;
+
+        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;
+
+        elf64ph = (Elf64_Phdr *)((unsigned long)elf64 +
+                                 (unsigned long)elf64->e_phoff);
+        for (i = 0; i < (unsigned int)elf64->e_phnum; i++, elf64ph++)
+                if (elf64ph->p_type == PT_LOAD && elf64ph->p_offset != 0)
+                        break;
+        if (i >= (unsigned int)elf64->e_phnum)
+                return 0;
+
+        elfoffset = (unsigned long)elf64ph->p_offset;
+        vmlinux.size = (unsigned long)elf64ph->p_filesz + elfoffset;
+        vmlinux.memsize = (unsigned long)elf64ph->p_memsz + elfoffset;
+        return 1;
+}
+
+static int is_elf32(void *hdr)
+{
+        Elf32_Ehdr *elf32 = hdr;
+        Elf32_Phdr *elf32ph;
+        unsigned int i;
+
+        if (!(elf32->e_ident[EI_MAG0]  == ELFMAG0       &&
+              elf32->e_ident[EI_MAG1]  == ELFMAG1       &&
+              elf32->e_ident[EI_MAG2]  == ELFMAG2       &&
+              elf32->e_ident[EI_MAG3]  == ELFMAG3       &&
+              elf32->e_ident[EI_CLASS] == ELFCLASS32    &&
+              elf32->e_ident[EI_DATA]  == ELFDATA2MSB   &&
+              elf32->e_type            == ET_EXEC       &&
+              elf32->e_machine         == EM_PPC))
+                return 0;
+
+        elf32 = (Elf32_Ehdr *)elfheader;
+        elf32ph = (Elf32_Phdr *) ((unsigned long)elf32 + elf32->e_phoff);
+        for (i = 0; i < elf32->e_phnum; i++, elf32ph++)
+                if (elf32ph->p_type == PT_LOAD && elf32ph->p_offset != 0)
+                        break;
+        if (i >= elf32->e_phnum)
+                return 0;
+
+        elfoffset = elf32ph->p_offset;
+        vmlinux.size = elf32ph->p_filesz + elf32ph->p_offset;
+        vmlinux.memsize = elf32ph->p_memsz + elf32ph->p_offset;
+        return 1;
+}
+
 void start(unsigned long a1, unsigned long a2, void *promptr, void *sp)
 {
-        unsigned long i;
         int len;
         kernel_entry_t kernel_entry;
-        Elf64_Ehdr *elf64;
-        Elf64_Phdr *elf64ph;
 
         memset(__bss_start, 0, _end - __bss_start);
 
@@ -153,6 +212,22 @@ void start(unsigned long a1, unsigned long a2, void *promptr, void *sp)
 
         printf("\n\rzImage starting: loaded at 0x%p (sp: 0x%p)\n\r", _start, sp);
 
+        vmlinuz.addr = (unsigned long)_vmlinux_start;
+        vmlinuz.size = (unsigned long)(_vmlinux_end - _vmlinux_start);
+
+        /* gunzip the ELF header of the kernel */
+        if (*(unsigned short *)vmlinuz.addr == 0x1f8b) {
+                len = vmlinuz.size;
+                gunzip(elfheader, sizeof(elfheader),
+                                (unsigned char *)vmlinuz.addr, &len);
+        } else
+                memcpy(elfheader, (const void *)vmlinuz.addr, sizeof(elfheader));
+
+        if (!is_elf64(elfheader) && !is_elf32(elfheader)) {
+                printf("Error: not a valid PPC32 or PPC64 ELF file!\n\r");
+                exit();
+        }
+
         /*
          * The first available claim_base must be above the end of the
          * the loaded kernel wrapper file (_start to _end includes the
@@ -172,46 +247,11 @@ void start(unsigned long a1, unsigned long a2, void *promptr, void *sp)
                 claim_base = PROG_START;
 #endif
 
-        vmlinuz.addr = (unsigned long)_vmlinux_start;
-        vmlinuz.size = (unsigned long)(_vmlinux_end - _vmlinux_start);
-
-        /* gunzip the ELF header of the kernel */
-        if (*(unsigned short *)vmlinuz.addr == 0x1f8b) {
-                len = vmlinuz.size;
-                gunzip(elfheader, sizeof(elfheader),
-                                (unsigned char *)vmlinuz.addr, &len);
-        } else
-                memcpy(elfheader, (const void *)vmlinuz.addr, sizeof(elfheader));
-
-        elf64 = (Elf64_Ehdr *)elfheader;
-        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 )
-        {
-                printf("Error: not a valid PPC64 ELF file!\n\r");
-                exit();
-        }
-
-        elf64ph = (Elf64_Phdr *)((unsigned long)elf64 +
-                                (unsigned long)elf64->e_phoff);
-        for(i=0; i < (unsigned int)elf64->e_phnum ;i++,elf64ph++) {
-                if (elf64ph->p_type == PT_LOAD && elf64ph->p_offset != 0)
-                        break;
-        }
-        vmlinux.size = (unsigned long)elf64ph->p_filesz +
-                (unsigned long)elf64ph->p_offset;
         /* We need to claim the memsize plus the file offset since gzip
          * will expand the header (file offset), then the kernel, then
          * possible rubbish we don't care about. But the kernel bss must
          * be claimed (it will be zero'd by the kernel itself)
          */
-        vmlinux.memsize = (unsigned long)elf64ph->p_memsz +
-                (unsigned long)elf64ph->p_offset;
         printf("Allocating 0x%lx bytes for kernel ...\n\r", vmlinux.memsize);
         vmlinux.addr = try_claim(vmlinux.memsize);
         if (vmlinux.addr == 0) {
@@ -254,9 +294,9 @@ void start(unsigned long a1, unsigned long a2, void *promptr, void *sp)
         /* Skip over the ELF header */
 #ifdef DEBUG
         printf("... skipping 0x%lx bytes of ELF header\n\r",
-                        (unsigned long)elf64ph->p_offset);
+                        elfoffset);
 #endif
-        vmlinux.addr += (unsigned long)elf64ph->p_offset;
+        vmlinux.addr += elfoffset;
 
         flush_cache((void *)vmlinux.addr, vmlinux.size);
 
@@ -272,7 +312,7 @@ void start(unsigned long a1, unsigned long a2, void *promptr, void *sp)
                 (unsigned long)prom, NULL);
 #endif
 
-        kernel_entry( a1, a2, prom, NULL );
+        kernel_entry(a1, a2, prom, NULL);
 
         printf("Error: Linux kernel returned to zImage bootloader!\n\r");
 
diff --git a/arch/ppc64/boot/page.h b/arch/powerpc/boot/page.h
index 14eca30fef6..14eca30fef6 100644
--- a/arch/ppc64/boot/page.h
+++ b/arch/powerpc/boot/page.h
diff --git a/arch/ppc64/boot/ppc_asm.h b/arch/powerpc/boot/ppc_asm.h
index 1c2c2817f9b..1c2c2817f9b 100644
--- a/arch/ppc64/boot/ppc_asm.h
+++ b/arch/powerpc/boot/ppc_asm.h
diff --git a/arch/ppc64/boot/prom.c b/arch/powerpc/boot/prom.c
index 4bea2f4dcb0..4bea2f4dcb0 100644
--- a/arch/ppc64/boot/prom.c
+++ b/arch/powerpc/boot/prom.c
diff --git a/arch/ppc64/boot/prom.h b/arch/powerpc/boot/prom.h
index 96ab5aec740..96ab5aec740 100644
--- a/arch/ppc64/boot/prom.h
+++ b/arch/powerpc/boot/prom.h
diff --git a/arch/ppc64/boot/stdio.h b/arch/powerpc/boot/stdio.h
index 24bd3a8dee9..24bd3a8dee9 100644
--- a/arch/ppc64/boot/stdio.h
+++ b/arch/powerpc/boot/stdio.h
diff --git a/arch/ppc64/boot/string.S b/arch/powerpc/boot/string.S
index b1eeaed7db1..b1eeaed7db1 100644
--- a/arch/ppc64/boot/string.S
+++ b/arch/powerpc/boot/string.S
diff --git a/arch/ppc64/boot/string.h b/arch/powerpc/boot/string.h
index 9fdff1cc0d7..9fdff1cc0d7 100644
--- a/arch/ppc64/boot/string.h
+++ b/arch/powerpc/boot/string.h
diff --git a/arch/ppc64/boot/zImage.lds b/arch/powerpc/boot/zImage.lds
index 4b6bb3ffe3d..4b6bb3ffe3d 100644
--- a/arch/ppc64/boot/zImage.lds
+++ b/arch/powerpc/boot/zImage.lds