Commit 099e1377 authored by Ian Campbell's avatar Ian Campbell Committed by Ingo Molnar

x86: use ELF format in compressed images.

Signed-off-by: default avatarIan Campbell <ijc@hellion.org.uk>
Cc: Ian Campbell <ijc@hellion.org.uk>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: virtualization@lists.linux-foundation.org
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: virtualization@lists.linux-foundation.org
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent e0bf0f75
......@@ -170,6 +170,8 @@ Offset Proto Name Meaning
0238/4 2.06+ cmdline_size Maximum size of the kernel command line
023C/4 2.07+ hardware_subarch Hardware subarchitecture
0240/8 2.07+ hardware_subarch_data Subarchitecture-specific data
0248/4 2.08+ compressed_payload_offset
024C/4 2.08+ compressed_payload_length
(1) For backwards compatibility, if the setup_sects field contains 0, the
real value is 4.
......@@ -512,6 +514,22 @@ Protocol: 2.07+
A pointer to data that is specific to hardware subarch
Field name: compressed_payload_offset
Type: read
Offset/size: 0x248/4
Protocol: 2.08+
If non-zero then this field contains the offset from the end of the
real-mode code to the compressed payload. The compression format
should be determined using the standard magic number, currently only
gzip is used.
Field name: compressed_payload_length
Type: read
Offset/size: 0x24c/4
Protocol: 2.08+
The length of the compressed payload.
**** THE KERNEL COMMAND LINE
......
......@@ -94,6 +94,20 @@ $(obj)/vmlinux.bin: $(obj)/compressed/vmlinux FORCE
SETUP_OBJS = $(addprefix $(obj)/,$(setup-y))
sed-offsets := -e 's/^00*/0/' \
-e 's/^\([0-9a-fA-F]*\) . \(input_data\|input_data_end\)$$/\#define \2 0x\1/p'
quiet_cmd_offsets = OFFSETS $@
cmd_offsets = $(NM) $< | sed -n $(sed-offsets) > $@
$(obj)/offsets.h: $(obj)/compressed/vmlinux FORCE
$(call if_changed,offsets)
targets += offsets.h
AFLAGS_header.o += -I$(obj)
$(obj)/header.o: $(obj)/offsets.h
LDFLAGS_setup.elf := -T
$(obj)/setup.elf: $(src)/setup.ld $(SETUP_OBJS) FORCE
$(call if_changed,ld)
......
......@@ -22,7 +22,7 @@ $(obj)/vmlinux: $(src)/vmlinux_$(BITS).lds $(obj)/head_$(BITS).o $(obj)/misc.o $
$(call if_changed,ld)
@:
OBJCOPYFLAGS_vmlinux.bin := -O binary -R .note -R .comment -S
OBJCOPYFLAGS_vmlinux.bin := -R .comment -S
$(obj)/vmlinux.bin: vmlinux FORCE
$(call if_changed,objcopy)
......
......@@ -15,6 +15,10 @@
* we just keep it from happening
*/
#undef CONFIG_PARAVIRT
#ifdef CONFIG_X86_32
#define _ASM_DESC_H_ 1
#endif
#ifdef CONFIG_X86_64
#define _LINUX_STRING_H_ 1
#define __LINUX_BITMAP_H 1
......@@ -22,6 +26,7 @@
#include <linux/linkage.h>
#include <linux/screen_info.h>
#include <linux/elf.h>
#include <asm/io.h>
#include <asm/page.h>
#include <asm/boot.h>
......@@ -365,6 +370,56 @@ static void error(char *x)
asm("hlt");
}
static void parse_elf(void *output)
{
#ifdef CONFIG_X86_64
Elf64_Ehdr ehdr;
Elf64_Phdr *phdrs, *phdr;
#else
Elf32_Ehdr ehdr;
Elf32_Phdr *phdrs, *phdr;
#endif
void *dest;
int i;
memcpy(&ehdr, output, sizeof(ehdr));
if(ehdr.e_ident[EI_MAG0] != ELFMAG0 ||
ehdr.e_ident[EI_MAG1] != ELFMAG1 ||
ehdr.e_ident[EI_MAG2] != ELFMAG2 ||
ehdr.e_ident[EI_MAG3] != ELFMAG3)
{
error("Kernel is not a valid ELF file");
return;
}
putstr("Parsing ELF... ");
phdrs = malloc(sizeof(*phdrs) * ehdr.e_phnum);
if (!phdrs)
error("Failed to allocate space for phdrs");
memcpy(phdrs, output + ehdr.e_phoff, sizeof(*phdrs) * ehdr.e_phnum);
for (i=0; i<ehdr.e_phnum; i++) {
phdr = &phdrs[i];
switch (phdr->p_type) {
case PT_LOAD:
#ifdef CONFIG_RELOCATABLE
dest = output;
dest += (phdr->p_paddr - LOAD_PHYSICAL_ADDR);
#else
dest = (void*)(phdr->p_paddr);
#endif
memcpy(dest,
output + phdr->p_offset,
phdr->p_filesz);
break;
default: /* Ignore other PT_* */ break;
}
}
}
asmlinkage void decompress_kernel(void *rmode, memptr heap,
uch *input_data, unsigned long input_len,
uch *output)
......@@ -408,6 +463,7 @@ asmlinkage void decompress_kernel(void *rmode, memptr heap,
makecrc();
putstr("\nDecompressing Linux... ");
gunzip();
parse_elf(output);
putstr("done.\nBooting the kernel.\n");
return;
}
......@@ -22,6 +22,7 @@
#include <asm/page.h>
#include <asm/setup.h>
#include "boot.h"
#include "offsets.h"
SETUPSECTS = 4 /* default nr of setup-sectors */
BOOTSEG = 0x07C0 /* original address of boot-sector */
......@@ -223,6 +224,11 @@ hardware_subarch: .long 0 # subarchitecture, added with 2.07
hardware_subarch_data: .quad 0
compressed_payload_offset:
.long input_data
compressed_payload_length:
.long input_data_end-input_data
# End of setup header #####################################################
.section ".inittext", "ax"
......
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