151 lines
3.4 KiB
C
151 lines
3.4 KiB
C
/* 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;
|
|
}
|
|
}
|
|
}
|
|
}
|