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okuji
36fd6bd0fa
* stage2/apm.S: Always disconnect from APM. Written by Erich Stefan Boleyn. * util/Makefile.am (noinst_DATA): Removed. (EXTRA_DIST): Likewise.
126 lines
2.9 KiB
ArmAsm
126 lines
2.9 KiB
ArmAsm
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2000, 2001 Free Software Foundation, Inc.
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*
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* This program 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 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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 this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/* This is stolen from arch/i386/boot/setup.S in Linux 2.2.17 */
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/*
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! setup.S Copyright (C) 1991, 1992 Linus Torvalds
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*/
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ENTRY(get_apm_info)
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pushl %ebp
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pushl %ebx
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pushl %edi
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pushl %esi
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call EXT_C(prot_to_real)
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.code16
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/* APM BIOS installation check */
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movw $0x5300, %ax
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xorw %bx, %bx
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int $0x15
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/* error -> no APM BIOS */
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jc done_apm_bios
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/* check for "PM" signature */
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cmpw $0x504d, %bx
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/* no signature -> no APM BIOS */
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jne done_apm_bios
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/* Is 32 bit supported? */
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andw $0x0002, %cx
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/* no ... */
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je done_apm_bios
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/* Disconnect first just in case */
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movw $0x5304, %ax
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xorw %bx, %bx
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/* ignore return code */
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int $0x15
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/* 32 bit connect */
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movw $0x5303, %ax
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xorl %ebx, %ebx
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/* paranoia */
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xorw %cx, %cx
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xorw %dx, %dx
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xorl %esi, %esi
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xorw %di, %di
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int $0x15
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/* error */
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jc no_32_apm_bios
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/* BIOS code segment */
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movw %ax, ABS(EXT_C(apm_bios_info)) + 2
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/* BIOS entry point offset */
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movl %ebx, ABS(EXT_C(apm_bios_info)) + 4
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/* BIOS 16 bit code segment */
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movw %cx, ABS(EXT_C(apm_bios_info)) + 8
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/* BIOS data segment */
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movw %dx, ABS(EXT_C(apm_bios_info)) + 10
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/* BIOS code segment length */
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movl %esi, ABS(EXT_C(apm_bios_info)) + 14
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/* BIOS data segment length */
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movw %di, ABS(EXT_C(apm_bios_info)) + 18
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/*
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* Redo the installation check as the 32 bit connect
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* modifies the flags returned on some BIOSs
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*/
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/* APM BIOS installation check */
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movw $0x5300, %ax
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xorw %bx, %bx
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/* paranoia */
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xorw %cx, %cx
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int $0x15
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/* error -> should not happen, tidy up */
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jc done_apm_bios
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/* check for "PM" signature */
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cmpw $0x504d, %bx
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/* no signature -> should not happen, tidy up */
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jne done_apm_bios
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/* record the APM BIOS version */
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movw %ax, ABS(EXT_C(apm_bios_info))
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/* and flags */
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movw %cx, ABS(EXT_C(apm_bios_info)) + 12
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jmp done_apm_bios
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no_32_apm_bios:
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/* remove 32 bit support bit */
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andw $0xfffd, ABS(EXT_C(apm_bios_info)) + 12
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done_apm_bios:
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/* Some paranoia here: Always Disconnect from APM */
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movw $0x5304, %ax
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xorw %bx, %bx
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/* ignore return code */
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int $0x15
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DATA32 call EXT_C(real_to_prot)
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.code32
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popl %esi
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popl %edi
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popl %ebx
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popl %ebp
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ret
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