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164 lines
3.0 KiB
ArmAsm
164 lines
3.0 KiB
ArmAsm
#include "elf.h"
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.arch sledgehammer
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.code32
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.equ FLAT_CODE_SEG,_pmcs-_gdt
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.equ FLAT_DATA_SEG,_pmds-_gdt
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.equ MSR_K6_EFER, 0xC0000080
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.equ EFER_LME, 0x00000100
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.equ X86_CR4_PAE, 0x00000020
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.equ CR0_PG, 0x80000000
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.section ".prefix", "ax", @progbits
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#define LOAD_ADDR 0x10000
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/* ELF Header */
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.globl elf_header
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elf_header:
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e_ident: .byte 0x7f, 'E', 'L', 'F', 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0
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e_type: .short ET_DYN
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e_machine: .short EM_X86_64
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e_version: .long 1
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e_entry: .long LOAD_ADDR + elf_start - elf_header
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e_phoff: .long elf_program_header - elf_header
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e_shoff: .long 0
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e_flags: .long 0
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e_ehsize: .short elf_header_end - elf_header
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e_phentsize: .short ELF32_PHDR_SIZE
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e_phnum: .short (elf_program_header_end - elf_program_header)/ELF32_PHDR_SIZE
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e_shentsize: .short 0
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e_shnum: .short 0
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e_shstrndx: .short 0
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elf_header_end:
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elf_program_header:
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phdr1_p_type: .long PT_NOTE
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phdr1_p_offset: .long elf_note - elf_header
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phdr1_p_vaddr: .long elf_note
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phdr1_p_paddr: .long elf_note
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phdr1_p_filesz: .long elf_note_end - elf_note
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phdr1_p_memsz: .long elf_note_end - elf_note
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phdr1_p_flags: .long PF_R | PF_W | PF_X
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phdr1_p_align: .long 0
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/* The decompressor */
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phdr2_p_type: .long PT_LOAD
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phdr2_p_offset: .long 0
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phdr2_p_vaddr: .long elf_header
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phdr2_p_paddr: .long LOAD_ADDR
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phdr2_p_filesz: .long _verbatim_size
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phdr2_p_memsz: .long _image_size
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phdr2_p_flags: .long PF_R | PF_W | PF_X
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phdr2_p_align: .long 16
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elf_program_header_end:
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.globl elf_note
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elf_note:
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.balign 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:
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.balign 4
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3:
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.asciz "Etherboot"
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4:
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.balign 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:
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.balign 4
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3:
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.asciz VERSION
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4:
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#if 0
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.balign 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:
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.balign 4
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3:
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.word 0
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4:
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#endif
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.balign 4
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elf_note_end:
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elf_start:
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.code64
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/* Reload the gdt to something I know */
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leaq _gdt(%rip), %rax
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movq %rax, 0x02 + gdtptr(%rip)
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lgdt gdtptr(%rip)
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/* Enter 32bit compatibility mode */
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leaq elf_start32(%rip), %rax
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movl %eax, 0x00 + elf_start32_addr(%rip)
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ljmp *elf_start32_addr(%rip)
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elf_start32:
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.code32
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/* Reload the data segments */
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movl $FLAT_DATA_SEG, %eax
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movl %eax, %ds
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movl %eax, %es
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movl %eax, %ss
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/* Disable paging */
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movl %cr0, %eax
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andl $~CR0_PG, %eax
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movl %eax, %cr0
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/* Disable long mode */
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movl $MSR_K6_EFER, %ecx
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rdmsr
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andl $~EFER_LME, %eax
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wrmsr
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/* Disable PAE */
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movl %cr4, %eax
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andl $~X86_CR4_PAE, %eax
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movl %eax, %cr4
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/* Save the first argument */
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pushl %ebx
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jmp _start
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gdtptr:
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.word _gdt_end - _gdt -1
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.long _gdt
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.long 0
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_gdt:
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elf_start32_addr:
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.long elf_start32
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.long FLAT_CODE_SEG
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_pmcs:
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/* 32 bit protected mode code segment, base 0 */
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.word 0xffff,0
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.byte 0,0x9f,0xcf,0
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_pmds:
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/* 32 bit protected mode data segment, base 0 */
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.word 0xffff,0
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.byte 0,0x93,0xcf,0
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_gdt_end:
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/* Dummy routines to satisfy the build */
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.section ".text16", "ax", @progbits
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.globl prefix_exit
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prefix_exit:
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.globl prefix_exit_end
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prefix_exit_end:
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.previous
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