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