mirror of
https://github.com/fail0verflow/switch-coreboot.git
synced 2025-05-04 01:39:18 -04:00
add the architecture dependent elfboot code.
call it something more useful than boot.c Signed-off-by: Ronald G. Minnich <rminnich@gmail.com> Acked-by: Ronald G. Minnich <rminnich@gmail.com> Acked-by: Stefan Reinauer <stepan@coresystems.de> git-svn-id: svn://coreboot.org/repository/LinuxBIOSv3@100 f3766cd6-281f-0410-b1cd-43a5c92072e9
This commit is contained in:
Ronald G. Minnich
parent
02a4d350c6
commit
03a012f2e0
1 changed files with 179 additions and 0 deletions
179
arch/x86/archelfboot.c
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179
arch/x86/archelfboot.c
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#include <console/console.h>
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#include <ip_checksum.h>
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#include <elf.h>
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#include <elf_boot.h>
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#include <string.h>
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#ifndef CMD_LINE
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#define CMD_LINE ""
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#endif
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#define UPSZ(X) ((sizeof(X) + 3) &~3)
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static struct {
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Elf_Bhdr hdr;
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Elf_Nhdr ft_hdr;
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unsigned char ft_desc[UPSZ(FIRMWARE_TYPE)];
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Elf_Nhdr bl_hdr;
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unsigned char bl_desc[UPSZ(BOOTLOADER)];
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Elf_Nhdr blv_hdr;
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unsigned char blv_desc[UPSZ(BOOTLOADER_VERSION)];
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Elf_Nhdr cmd_hdr;
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unsigned char cmd_desc[UPSZ(CMD_LINE)];
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} elf_boot_notes = {
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.hdr = {
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.b_signature = 0x0E1FB007,
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.b_size = sizeof(elf_boot_notes),
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.b_checksum = 0,
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.b_records = 4,
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},
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.ft_hdr = {
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.n_namesz = 0,
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.n_descsz = sizeof(FIRMWARE_TYPE),
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.n_type = EBN_FIRMWARE_TYPE,
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},
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.ft_desc = FIRMWARE_TYPE,
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.bl_hdr = {
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.n_namesz = 0,
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.n_descsz = sizeof(BOOTLOADER),
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.n_type = EBN_BOOTLOADER_NAME,
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},
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.bl_desc = BOOTLOADER,
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.blv_hdr = {
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.n_namesz = 0,
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.n_descsz = sizeof(BOOTLOADER_VERSION),
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.n_type = EBN_BOOTLOADER_VERSION,
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},
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.blv_desc = BOOTLOADER_VERSION,
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.cmd_hdr = {
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.n_namesz = 0,
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.n_descsz = sizeof(CMD_LINE),
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.n_type = EBN_COMMAND_LINE,
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},
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.cmd_desc = CMD_LINE,
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};
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int elf_check_arch(Elf_ehdr *ehdr)
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{
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return (
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((ehdr->e_machine == EM_386) || (ehdr->e_machine == EM_486)) &&
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(ehdr->e_ident[EI_CLASS] == ELFCLASS32) &&
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(ehdr->e_ident[EI_DATA] == ELFDATA2LSB)
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);
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}
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void jmp_to_elf_entry(void *entry)
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{
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extern unsigned char _ram_seg, _eram_seg;
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unsigned long lb_start, lb_size;
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unsigned long adjusted_boot_notes;
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unsigned long type;
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elf_boot_notes.hdr.b_checksum =
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compute_ip_checksum(&elf_boot_notes, sizeof(elf_boot_notes));
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type = 0x0E1FB007;
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lb_start = (unsigned long)&_ram_seg;
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lb_size = (unsigned long)(&_eram_seg - &_ram_seg);
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adjusted_boot_notes = (unsigned long)&elf_boot_notes;
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printk_spew("entry = 0x%08lx\n", (unsigned long)entry);
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printk_spew("lb_start = 0x%08lx\n", lb_start);
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printk_spew("lb_size = 0x%08lx\n", lb_size);
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printk_spew("buffer = 0x%08lx\n", buffer);
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printk_spew(" elf_boot_notes = 0x%08lx\n", (unsigned long)&elf_boot_notes);
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printk_spew("adjusted_boot_notes = 0x%08lx\n", adjusted_boot_notes);
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/* Jump to kernel */
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__asm__ __volatile__(
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" cld \n\t"
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/* Save the callee save registers... */
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" pushl %%esi\n\t"
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" pushl %%edi\n\t"
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" pushl %%ebx\n\t"
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/* Save the parameters I was passed */
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" pushl $0\n\t" /* 20 adjust */
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" pushl %0\n\t" /* 16 lb_start */
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" pushl %1\n\t" /* 12 buffer */
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" pushl %2\n\t" /* 8 lb_size */
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" pushl %3\n\t" /* 4 entry */
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" pushl %4\n\t" /* 0 elf_boot_notes */
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/* Compute the adjustment */
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" xorl %%eax, %%eax\n\t"
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" subl 16(%%esp), %%eax\n\t"
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" addl 12(%%esp), %%eax\n\t"
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" addl 8(%%esp), %%eax\n\t"
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" movl %%eax, 20(%%esp)\n\t"
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/* Place a copy of linuxBIOS in it's new location */
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/* Move ``longs'' the linuxBIOS size is 4 byte aligned */
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" movl 12(%%esp), %%edi\n\t"
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" addl 8(%%esp), %%edi\n\t"
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" movl 16(%%esp), %%esi\n\t"
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" movl 8(%%esp), %%ecx\n\n"
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" shrl $2, %%ecx\n\t"
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" rep movsl\n\t"
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/* Adjust the stack pointer to point into the new linuxBIOS image */
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" addl 20(%%esp), %%esp\n\t"
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/* Adjust the instruction pointer to point into the new linuxBIOS image */
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" movl $1f, %%eax\n\t"
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" addl 20(%%esp), %%eax\n\t"
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" jmp *%%eax\n\t"
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"1: \n\t"
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/* Copy the linuxBIOS bounce buffer over linuxBIOS */
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/* Move ``longs'' the linuxBIOS size is 4 byte aligned */
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" movl 16(%%esp), %%edi\n\t"
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" movl 12(%%esp), %%esi\n\t"
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" movl 8(%%esp), %%ecx\n\t"
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" shrl $2, %%ecx\n\t"
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" rep movsl\n\t"
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/* Now jump to the loaded image */
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" movl $0x0E1FB007, %%eax\n\t"
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" movl 0(%%esp), %%ebx\n\t"
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" call *4(%%esp)\n\t"
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/* The loaded image returned? */
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" cli \n\t"
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" cld \n\t"
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/* Copy the saved copy of linuxBIOS where linuxBIOS runs */
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/* Move ``longs'' the linuxBIOS size is 4 byte aligned */
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" movl 16(%%esp), %%edi\n\t"
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" movl 12(%%esp), %%esi\n\t"
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" addl 8(%%esp), %%esi\n\t"
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" movl 8(%%esp), %%ecx\n\t"
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" shrl $2, %%ecx\n\t"
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" rep movsl\n\t"
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/* Adjust the stack pointer to point into the old linuxBIOS image */
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" subl 20(%%esp), %%esp\n\t"
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/* Adjust the instruction pointer to point into the old linuxBIOS image */
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" movl $1f, %%eax\n\t"
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" subl 20(%%esp), %%eax\n\t"
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" jmp *%%eax\n\t"
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"1: \n\t"
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/* Drop the parameters I was passed */
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" addl $24, %%esp\n\t"
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/* Restore the callee save registers */
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" popl %%ebx\n\t"
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" popl %%edi\n\t"
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" popl %%esi\n\t"
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::
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"g" (lb_start), "g" (buffer), "g" (lb_size),
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"g" (entry), "g"(adjusted_boot_notes)
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);
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}
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