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