diff options
Diffstat (limited to 'grub-core/lib/i386/relocator_common.S')
| -rw-r--r-- | grub-core/lib/i386/relocator_common.S | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/grub-core/lib/i386/relocator_common.S b/grub-core/lib/i386/relocator_common.S new file mode 100644 index 0000000..1b5210d --- /dev/null +++ b/grub-core/lib/i386/relocator_common.S @@ -0,0 +1,111 @@ +/* + * 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/>. + */ + + +#include <grub/symbol.h> +#include <grub/i386/memory.h> + +#ifdef __x86_64__ +#define RAX %rax +#define RSI %rsi +#else +#define RAX %eax +#define RSI %esi +#endif + + .macro DISABLE_PAGING + + movl %cr0, %eax + andl $(~GRUB_MEMORY_CPU_CR0_PAGING_ON), %eax + movl %eax, %cr0 + .endm + + .macro PREAMBLE +LOCAL(base): + /* %rax contains now our new 'base'. */ + mov RAX, RSI + +#if defined (__APPLE__) && defined (__x86_64__) + leaq LOCAL(cont0) (%rip), RAX +#elif defined (__APPLE__) + LOCAL(cont0_offset) = LOCAL(cont0) - LOCAL(base) + add $LOCAL(cont0_offset), RAX +#else + add $(LOCAL(cont0) - LOCAL(base)), RAX +#endif + jmp *RAX +LOCAL(cont0): + .endm + + .macro RELOAD_GDT +#ifdef __APPLE__ + LOCAL(cont1_offset) = LOCAL(cont1) - LOCAL(base) + LOCAL(jump_vector_offset) = LOCAL(jump_vector) - LOCAL(base) + LOCAL(gdt_offset) = LOCAL(gdt) - LOCAL(base) + LOCAL(gdt_addr_offset) = LOCAL(gdt_addr) - LOCAL(base) + LOCAL(gdtdesc_offset) = LOCAL(gdtdesc) - LOCAL(base) + + lea LOCAL(cont1_offset) (RSI, 1), RAX + movl %eax, LOCAL(jump_vector_offset) (RSI, 1) + + lea LOCAL(gdt_offset) (RSI, 1), RAX + mov RAX, (LOCAL(gdt_addr_offset)) (RSI, 1) + + /* Switch to compatibility mode. */ + lgdt (LOCAL(gdtdesc_offset)) (RSI, 1) + + /* Update %cs. */ + ljmp *(LOCAL(jump_vector_offset)) (RSI, 1) + .p2align 4 +LOCAL(gdtdesc): + LOCAL(gdtsize) = LOCAL(gdt_end) - LOCAL(gdt) + .word LOCAL(gdtsize) +#else + lea (LOCAL(cont1) - LOCAL(base)) (RSI, 1), RAX + movl %eax, (LOCAL(jump_vector) - LOCAL(base)) (RSI, 1) + + lea (LOCAL(gdt) - LOCAL(base)) (RSI, 1), RAX + mov RAX, (LOCAL(gdt_addr) - LOCAL(base)) (RSI, 1) + + /* Switch to compatibility mode. */ + lgdt (LOCAL(gdtdesc) - LOCAL(base)) (RSI, 1) + + /* Update %cs. */ + ljmp *(LOCAL(jump_vector) - LOCAL(base)) (RSI, 1) + + .p2align 4 +LOCAL(gdtdesc): + .word LOCAL(gdt_end) - LOCAL(gdt) +#endif +LOCAL(gdt_addr): +#ifdef __x86_64__ + /* Filled by the code. */ + .quad 0 +#else + /* Filled by the code. */ + .long 0 +#endif + + .p2align 4 +LOCAL(jump_vector): + /* Jump location. Is filled by the code */ + .long 0 + .long CODE_SEGMENT + +LOCAL(cont1): + .endm |