82 lines
1.9 KiB
ArmAsm
82 lines
1.9 KiB
ArmAsm
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2009,2010 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/symbol.h>
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#include <grub/i386/memory.h>
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#ifdef __x86_64__
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#define RAX %rax
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#define RSI %rsi
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#else
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#define RAX %eax
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#define RSI %esi
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#endif
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.macro DISABLE_PAGING
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#ifdef GRUB_MACHINE_IEEE1275
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#endif
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movl %cr0, %eax
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andl $(~GRUB_MEMORY_CPU_CR0_PAGING_ON), %eax
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movl %eax, %cr0
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.endm
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.macro PREAMBLE
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LOCAL(base):
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/* %rax contains now our new 'base'. */
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mov RAX, RSI
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add $(LOCAL(cont0) - LOCAL(base)), RAX
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jmp *RAX
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LOCAL(cont0):
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.endm
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.macro RELOAD_GDT
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lea (LOCAL(cont1) - LOCAL(base)) (RSI, 1), RAX
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movl %eax, (LOCAL(jump_vector) - LOCAL(base)) (RSI, 1)
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lea (LOCAL(gdt) - LOCAL(base)) (RSI, 1), RAX
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mov RAX, (LOCAL(gdt_addr) - LOCAL(base)) (RSI, 1)
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/* Switch to compatibility mode. */
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lgdt (LOCAL(gdtdesc) - LOCAL(base)) (RSI, 1)
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/* Update %cs. */
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ljmp *(LOCAL(jump_vector) - LOCAL(base)) (RSI, 1)
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.p2align 4
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LOCAL(gdtdesc):
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.word LOCAL(gdt_end) - LOCAL(gdt)
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LOCAL(gdt_addr):
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#ifdef __x86_64__
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/* Filled by the code. */
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.quad 0
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#else
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/* Filled by the code. */
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.long 0
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#endif
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.p2align 4
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LOCAL(jump_vector):
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/* Jump location. Is filled by the code */
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.long 0
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.long CODE_SEGMENT
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LOCAL(cont1):
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.endm
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