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/* Support for ELF Boot Proposal as a boot image */
#include "config.h"
#include "arch/common/elf_boot.h"
#include "libopenbios/sys_info.h"
#include "asm/io.h"
#include "libopenbios/ipchecksum.h"
#include "openbios-version.h"
#define printf printk
#define debug printk
/* ELF image notes provide information to the loader who boots us */
/* This compiles and generates correct PT_NOTE segment for me.
* If it doesn't, use assembly version below. */
struct elf_image_note {
Elf_Nhdr hdr0;
char name0[sizeof(ELF_NOTE_BOOT)];
char prog_name[sizeof(PROGRAM_NAME)];
Elf_Nhdr hdr1;
char name1[sizeof(ELF_NOTE_BOOT)];
char version[sizeof(OPENBIOS_VERSION_STR)];
Elf_Nhdr hdr2;
char name2[sizeof(ELF_NOTE_BOOT)];
unsigned short checksum;
};
const struct elf_image_note elf_image_notes
__attribute__ ((section (".note.ELFBoot"))) =
{
.hdr0 = {
.n_namesz = sizeof(ELF_NOTE_BOOT),
.n_descsz = sizeof(PROGRAM_NAME),
.n_type = EIN_PROGRAM_NAME,
},
.name0 = ELF_NOTE_BOOT,
.prog_name = PROGRAM_NAME,
.hdr1 = {
.n_namesz = sizeof(ELF_NOTE_BOOT),
.n_descsz = sizeof(OPENBIOS_VERSION_STR),
.n_type = EIN_PROGRAM_VERSION,
},
.name1 = ELF_NOTE_BOOT,
.version = OPENBIOS_VERSION_STR,
.hdr2 = {
.n_namesz = sizeof(ELF_NOTE_BOOT),
.n_descsz = sizeof(unsigned short),
.n_type = EIN_PROGRAM_CHECKSUM,
},
.name2 = ELF_NOTE_BOOT,
.checksum = 0, /* to be computed by external tool */
};
/* This is refered by other files */
const char *program_name = elf_image_notes.prog_name;
const char *program_version = elf_image_notes.version;
#if 0
/* This tells the linker to make a PT_NOTE segment.
* If the section is named just ".note", it will be
* mixed up with useless .version notes generated by GCC.
*/
.section ".note.ELFBoot", "a"
.align 4
.int 2f - 1f
.int 4f - 3f
.int EIN_PROGRAM_NAME
1: .asciz "ELFBoot"
2: .align 4
3: .asciz PROGRAM_NAME
4:
.align 4
.int 2f - 1f
.int 4f - 3f
.int EIN_PROGRAM_VERSION
1: .asciz "ELFBoot"
2: .align 4
3: .asciz OPENBIOS_VERSION_STR
4:
.align 4
.int 2f - 1f
.int 4f - 3f
.int EIN_PROGRAM_CHECKSUM
1: .asciz "ELFBoot"
2: .align 4
3: .short 0
4:
#endif
/* Collect information from the ELF bootloader
* Note that we have to copy them to our own memory,
* otherwise they might be overwritten afterward. */
void collect_elfboot_info(struct sys_info *info)
{
Elf_Bhdr *hdr = NULL;
char *addr, *end;
Elf_Nhdr *nhdr;
char *desc;
if (info->boot_type == ELF_BHDR_MAGIC)
hdr = phys_to_virt(info->boot_data);
else
hdr = phys_to_virt(info->boot_arg);
if (hdr->b_signature != ELF_BHDR_MAGIC)
return;
if (ipchksum(hdr, hdr->b_size) != 0) {
printf("Broken ELF boot notes\n");
return;
}
addr = (char *) (hdr + 1);
end = addr + hdr->b_size;
while (addr < end) {
nhdr = (Elf_Nhdr *) addr;
addr += sizeof(Elf_Nhdr);
addr += (nhdr->n_namesz + 3) & ~3;
desc = addr;
addr += (nhdr->n_descsz + 3) & ~3;
if (nhdr->n_namesz == 0) {
/* Standard notes */
switch (nhdr->n_type) {
case EBN_FIRMWARE_TYPE:
info->firmware = strdup(desc);
break;
case EBN_BOOTLOADER_NAME:
debug("Bootloader: %s\n", desc);
break;
case EBN_BOOTLOADER_VERSION:
debug("Version: %s\n", desc);
break;
case EBN_COMMAND_LINE:
info->command_line = strdup(desc);
break;
case EBN_LOADED_IMAGE:
debug("Image name: %s\n", desc);
break;
}
}
}
}
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