133 lines
2.6 KiB
ArmAsm
133 lines
2.6 KiB
ArmAsm
/* Mmap management. */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2009 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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#define DS(x) ((x) - LOCAL (segstart))
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LOCAL (segstart):
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VARIABLE(grub_machine_mmaphook_start)
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.code16
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VARIABLE(grub_machine_mmaphook_int12)
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push %ds
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push %cs
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pop %ds
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movw DS (LOCAL (kblow)), %ax
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pop %ds
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iret
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VARIABLE(grub_machine_mmaphook_int15)
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pushf
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cmpw $0xe801, %ax
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jz LOCAL (e801)
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cmpw $0xe820, %ax
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jz LOCAL (e820)
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cmpb $0x88, %ah
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jz LOCAL (h88)
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popf
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/* ljmp */
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.byte 0xea
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VARIABLE (grub_machine_mmaphook_int15offset)
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.word 0
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VARIABLE (grub_machine_mmaphook_int15segment)
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.word 0
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LOCAL (e801):
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popf
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push %ds
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push %cs
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pop %ds
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movw DS (LOCAL (kbin16mb)), %ax
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movw DS (LOCAL (m64kbin4gb)), %bx
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movw %ax, %cx
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movw %bx, %dx
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pop %ds
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clc
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jmp LOCAL (iret_cf)
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LOCAL (h88):
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popf
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push %ds
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push %cs
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pop %ds
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movw DS (LOCAL (kbin16mb)), %ax
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pop %ds
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clc
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jmp LOCAL (iret_cf)
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LOCAL (e820):
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popf
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push %ds
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push %cs
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pop %ds
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cmpw $20, %cx
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jb LOCAL (errexit)
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cmpw DS (LOCAL (mmap_num)), %bx
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jae LOCAL (errexit)
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cmp $0x534d4150, %edx
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jne LOCAL (errexit)
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push %si
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push %di
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movw $20, %cx
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movw $(DS(LOCAL (mmaphook_mmap))), %si
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mov %bx, %ax
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imul $20, %ax
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add %ax, %si
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rep movsb
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pop %di
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pop %si
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movl $20, %ecx
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inc %bx
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cmpw DS(LOCAL (mmap_num)), %bx
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jb LOCAL (noclean)
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xor %bx, %bx
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LOCAL (noclean):
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mov $0x534d4150, %eax
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pop %ds
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clc
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jmp LOCAL (iret_cf)
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LOCAL (errexit):
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mov $0x534d4150, %eax
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pop %ds
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xor %bx, %bx
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stc
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LOCAL (iret_cf):
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push %bp
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mov %sp, %bp
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setc 6(%bp)
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pop %bp
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iret
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VARIABLE(grub_machine_mmaphook_mmap_num)
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LOCAL (mmap_num):
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.word 0
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VARIABLE(grub_machine_mmaphook_kblow)
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LOCAL (kblow):
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.word 0
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VARIABLE (grub_machine_mmaphook_kbin16mb)
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LOCAL (kbin16mb):
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.word 0
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VARIABLE (grub_machine_mmaphook_64kbin4gb)
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LOCAL (m64kbin4gb):
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.word 0
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LOCAL (mmaphook_mmap):
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/* Memory map is placed just after the interrupt handlers. */
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VARIABLE(grub_machine_mmaphook_end)
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.byte 0
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