| /* |
| * GRUB -- GRand Unified Bootloader |
| * Copyright (C) 2009,2010 Free Software Foundation, Inc. |
| * |
| * GRUB is free software: you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation, either version 3 of the License, or |
| * (at your option) any later version. |
| * |
| * GRUB is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with GRUB. If not, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| /* The code segment of the protected mode. */ |
| #define CODE_SEGMENT 0x10 |
| |
| /* The data segment of the protected mode. */ |
| #define DATA_SEGMENT 0x18 |
| |
| #include "relocator_common.S" |
| |
| .p2align 4 /* force 16-byte alignment */ |
| |
| VARIABLE(grub_relocator32_start) |
| PREAMBLE |
| |
| RELOAD_GDT |
| .code32 |
| /* Update other registers. */ |
| movl $DATA_SEGMENT, %eax |
| movl %eax, %ds |
| movl %eax, %es |
| movl %eax, %fs |
| movl %eax, %gs |
| movl %eax, %ss |
| |
| DISABLE_PAGING |
| |
| #ifdef __x86_64__ |
| /* Disable amd64. */ |
| movl $GRUB_MEMORY_CPU_AMD64_MSR, %ecx |
| rdmsr |
| andl $(~GRUB_MEMORY_CPU_AMD64_MSR_ON), %eax |
| wrmsr |
| #endif |
| |
| /* Turn off PAE. */ |
| movl %cr4, %eax |
| andl $(~GRUB_MEMORY_CPU_CR4_PAE_ON), %eax |
| movl %eax, %cr4 |
| |
| jmp LOCAL(cont2) |
| LOCAL(cont2): |
| .code32 |
| |
| /* mov imm32, %eax */ |
| .byte 0xb8 |
| VARIABLE(grub_relocator32_esp) |
| .long 0 |
| |
| movl %eax, %esp |
| |
| /* mov imm32, %eax */ |
| .byte 0xb8 |
| VARIABLE(grub_relocator32_ebp) |
| .long 0 |
| |
| movl %eax, %ebp |
| |
| /* mov imm32, %eax */ |
| .byte 0xb8 |
| VARIABLE(grub_relocator32_esi) |
| .long 0 |
| |
| movl %eax, %esi |
| |
| /* mov imm32, %eax */ |
| .byte 0xb8 |
| VARIABLE(grub_relocator32_edi) |
| .long 0 |
| |
| movl %eax, %edi |
| |
| /* mov imm32, %eax */ |
| .byte 0xb8 |
| VARIABLE(grub_relocator32_eax) |
| .long 0 |
| |
| /* mov imm32, %ebx */ |
| .byte 0xbb |
| VARIABLE(grub_relocator32_ebx) |
| .long 0 |
| |
| /* mov imm32, %ecx */ |
| .byte 0xb9 |
| VARIABLE(grub_relocator32_ecx) |
| .long 0 |
| |
| /* mov imm32, %edx */ |
| .byte 0xba |
| VARIABLE(grub_relocator32_edx) |
| .long 0 |
| |
| /* Cleared direction flag is of no problem with any current |
| payload and makes this implementation easier. */ |
| cld |
| |
| .byte 0xea |
| VARIABLE(grub_relocator32_eip) |
| .long 0 |
| .word CODE_SEGMENT |
| |
| /* GDT. Copied from loader/i386/linux.c. */ |
| .p2align 4 |
| LOCAL(gdt): |
| /* NULL. */ |
| .byte 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 |
| |
| /* Reserved. */ |
| .byte 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 |
| |
| /* Code segment. */ |
| .byte 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x9A, 0xCF, 0x00 |
| |
| /* Data segment. */ |
| .byte 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x92, 0xCF, 0x00 |
| LOCAL(gdt_end): |
| |
| VARIABLE(grub_relocator32_end) |
