| /* |
| * GRUB -- GRand Unified Bootloader |
| * Copyright (C) 2010,2011 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/>. |
| */ |
| |
| FUNCTION(grub_bios_interrupt) |
| pushf |
| cli |
| popf |
| pushl %ebp |
| pushl %ecx |
| pushl %eax |
| pushl %ebx |
| pushl %esi |
| pushl %edi |
| pushl %edx |
| |
| movb %al, intno |
| movl (%edx), %eax |
| movl %eax, LOCAL(bios_register_eax) |
| movw 4(%edx), %ax |
| movw %ax, LOCAL(bios_register_es) |
| movw 6(%edx), %ax |
| movw %ax, LOCAL(bios_register_ds) |
| movw 8(%edx), %ax |
| movw %ax, LOCAL(bios_register_flags) |
| |
| movl 12(%edx), %ebx |
| movl 16(%edx), %ecx |
| movl 20(%edx), %edi |
| movl 24(%edx), %esi |
| movl 28(%edx), %edx |
| |
| /* |
| Via C3 CPUs have cache coherence problems, so we need to call |
| wbinvd at these 2 points. As wbinvd slows down boot, don't do |
| it on non-VIA. 9090 is nop nop. */ |
| VARIABLE(grub_bios_via_workaround1) |
| .byte 0x90, 0x90 |
| |
| PROT_TO_REAL |
| .code16 |
| pushf |
| cli |
| |
| mov %ds, %ax |
| push %ax |
| |
| /* movw imm16, %ax*/ |
| .byte 0xb8 |
| LOCAL(bios_register_es): |
| .short 0 |
| movw %ax, %es |
| /* movw imm16, %ax*/ |
| .byte 0xb8 |
| LOCAL(bios_register_ds): |
| .short 0 |
| movw %ax, %ds |
| |
| /* movw imm16, %ax*/ |
| .byte 0xb8 |
| LOCAL(bios_register_flags): |
| .short 0 |
| push %ax |
| popf |
| |
| /* movl imm32, %eax*/ |
| .byte 0x66, 0xb8 |
| LOCAL(bios_register_eax): |
| .long 0 |
| |
| /* int imm8. */ |
| .byte 0xcd |
| intno: |
| .byte 0 |
| |
| movl %eax, %cs:LOCAL(bios_register_eax) |
| movw %ds, %ax |
| movw %ax, %cs:LOCAL(bios_register_ds) |
| pop %ax |
| mov %ax, %ds |
| pushf |
| pop %ax |
| movw %ax, LOCAL(bios_register_flags) |
| mov %es, %ax |
| movw %ax, LOCAL(bios_register_es) |
| |
| popf |
| |
| VARIABLE(grub_bios_via_workaround2) |
| .byte 0x90, 0x90 |
| |
| REAL_TO_PROT |
| .code32 |
| |
| popl %eax |
| |
| movl %ebx, 12(%eax) |
| movl %ecx, 16(%eax) |
| movl %edi, 20(%eax) |
| movl %esi, 24(%eax) |
| movl %edx, 28(%eax) |
| |
| movl %eax, %edx |
| |
| movl LOCAL(bios_register_eax), %eax |
| movl %eax, (%edx) |
| movw LOCAL(bios_register_es), %ax |
| movw %ax, 4(%edx) |
| movw LOCAL(bios_register_ds), %ax |
| movw %ax, 6(%edx) |
| movw LOCAL(bios_register_flags), %ax |
| movw %ax, 8(%edx) |
| |
| popl %edi |
| popl %esi |
| popl %ebx |
| popl %eax |
| popl %ecx |
| popl %ebp |
| ret |
