diff options
Diffstat (limited to 'grub-core/lib/i386/relocator64.S')
| -rw-r--r-- | grub-core/lib/i386/relocator64.S | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/grub-core/lib/i386/relocator64.S b/grub-core/lib/i386/relocator64.S new file mode 100644 index 0000000..00bf315 --- /dev/null +++ b/grub-core/lib/i386/relocator64.S @@ -0,0 +1,210 @@ +/* + * 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/>. + */ + +#define CODE32_SEGMENT 0x18 +#define CODE_SEGMENT 0x08 + +/* The data segment of the protected mode. */ +#define DATA_SEGMENT 0x10 + +#include "relocator_common.S" + + .p2align 4 /* force 16-byte alignment */ + +VARIABLE(grub_relocator64_start) + PREAMBLE +#ifndef __x86_64__ + DISABLE_PAGING + + /* Turn on PAE. */ + movl %cr4, %eax + orl $(GRUB_MEMORY_CPU_CR4_PAE_ON | GRUB_MEMORY_CPU_CR4_PSE_ON), %eax + movl %eax, %cr4 + + /* mov imm32, %eax */ + .byte 0xb8 +VARIABLE(grub_relocator64_cr3) + .long 0 + movl %eax, %cr3 + + /* Turn on amd64. */ + movl $GRUB_MEMORY_CPU_AMD64_MSR, %ecx + rdmsr + orl $GRUB_MEMORY_CPU_AMD64_MSR_ON, %eax + wrmsr + + /* Enable paging. */ + movl %cr0, %eax + orl $GRUB_MEMORY_CPU_CR0_PAGING_ON, %eax + movl %eax, %cr0 + + RELOAD_GDT +#else + /* mov imm64, %rax */ + .byte 0x48 + .byte 0xb8 +VARIABLE(grub_relocator64_cr3) + .quad 0 + movq %rax, %cr3 +#endif + +#ifdef __x86_64__ + .code64 +#endif + + /* mov imm64, %rax */ + .byte 0x48 + .byte 0xb8 +VARIABLE(grub_relocator64_rsp) + .quad 0 + +#ifdef __x86_64__ + movq %rax, %rsp +#else + /* movq %rax, %rsp */ + .byte 0x48 + .byte 0x89 + .byte 0xc4 +#endif + +#ifdef GRUB_MACHINE_EFI + jmp LOCAL(skip_efi_stack_align) + + /* + * Here is grub_relocator64_efi_start() entry point. Most of the + * code below is shared between grub_relocator64_efi_start() + * and grub_relocator64_start(). + * + * Think twice before changing anything there!!! + */ +VARIABLE(grub_relocator64_efi_start) + /* Align the stack as UEFI spec requires. */ +#ifdef __x86_64__ + andq $~15, %rsp +#else + /* andq $~15, %rsp */ + .byte 0x48 + .byte 0x83 + .byte 0xe4 + .byte 0xf0 +#endif + +LOCAL(skip_efi_stack_align): +#endif + /* mov imm64, %rax */ + .byte 0x48 + .byte 0xb8 +VARIABLE(grub_relocator64_rsi) + .quad 0 + +#ifdef __x86_64__ + movq %rax, %rsi +#else + /* movq %rax, %rsi */ + .byte 0x48 + .byte 0x89 + .byte 0xc6 +#endif + + /* mov imm64, %rax */ + .byte 0x48 + .byte 0xb8 +VARIABLE(grub_relocator64_rax) + .quad 0 + + /* mov imm64, %rbx */ + .byte 0x48 + .byte 0xbb +VARIABLE(grub_relocator64_rbx) + .quad 0 + + /* mov imm64, %rcx */ + .byte 0x48 + .byte 0xb9 +VARIABLE(grub_relocator64_rcx) + .quad 0 + + /* mov imm64, %rdx */ + .byte 0x48 + .byte 0xba +VARIABLE(grub_relocator64_rdx) + .quad 0 + + /* Cleared direction flag is of no problem with any current + payload and makes this implementation easier. */ + cld + +#if defined (__APPLE__) || !defined (__x86_64__) + .byte 0xff, 0x25 + .quad 0 +#else + jmp *LOCAL(jump_addr) (%rip) +#endif + +LOCAL(jump_addr): +VARIABLE(grub_relocator64_rip) + .quad 0 + +#ifdef GRUB_MACHINE_EFI + /* Here grub_relocator64_efi_start() ends. Ufff... */ +VARIABLE(grub_relocator64_efi_end) +#endif + +#ifndef __x86_64__ + .p2align 4 +LOCAL(gdt): + /* NULL. */ + .byte 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 + + /* 64-bit segment. */ + .word 0xffff /* Limit xffff. */ + .word 0x0000 /* Base xxxx0000. */ + .byte 0x00 /* Base xx00xxxx. */ + .byte (0x8 /* Type 8. */ | (1 << 4) /* Code. */ \ + | (0 << 5) /* Ring 0. */ | (1 << 7) /* Present. */) + .byte (0xf /* Limit fxxxx. */ | (0 << 4) /* AVL flag. */ \ + | (1 << 5) /* 64-bit. */ | (0 << 6) \ + | (1 << 7) /* 4K granular. */) + .byte 0x00 /* Base 00xxxxxx. */ + + /* Data segment*/ + .word 0xffff /* Limit xffff. */ + .word 0x0000 /* Base xxxx0000. */ + .byte 0x00 /* Base xx00xxxx. */ + .byte (0x0 /* Type 0. */ | (0 << 4) /* Data. */ \ + | (0 << 5) /* Ring 0. */ | (1 << 7) /* Present. */) + .byte (0xf /* Limit fxxxx. */ | (0 << 4) /* AVL flag. */ \ + | (0 << 5) /* Data. */ | (0 << 6) \ + | (1 << 7) /* 4K granular. */) + .byte 0x00 /* Base 00xxxxxx. */ + + /* Compatibility segment. */ + .word 0xffff /* Limit xffff. */ + .word 0x0000 /* Base xxxx0000. */ + .byte 0x00 /* Base xx00xxxx. */ + .byte (0x8 /* Type 8. */ | (1 << 4) /* Code. */ \ + | (0 << 5) /* Ring 0. */ | (1 << 7) /* Present. */) + .byte (0xf /* Limit fxxxx. */ | (0 << 4) /* AVL flag. */ \ + | (0 << 5) /* 32-bit. */ | (1 << 6) /* 32-bit. */ \ + | (1 << 7) /* 4K granular. */) + .byte 0x00 /* Base 00xxxxxx. */ + +LOCAL(gdt_end): +#endif + +VARIABLE(grub_relocator64_end) |