/* * 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 . */ #include #include #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