root / pc-bios / optionrom / optionrom.h @ 076d2471
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/*
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* Common Option ROM Functions
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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, see <http://www.gnu.org/licenses/>.
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*
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* Copyright Novell Inc, 2009
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* Authors: Alexander Graf <agraf@suse.de>
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*/
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#define NO_QEMU_PROTOS
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#include "../../hw/fw_cfg.h" |
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#define BIOS_CFG_IOPORT_CFG 0x510 |
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#define BIOS_CFG_IOPORT_DATA 0x511 |
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/* Break the translation block flow so -d cpu shows us values */
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#define DEBUG_HERE \
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jmp 1f; \
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1:
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/*
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* Read a variable from the fw_cfg device.
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* Clobbers: %edx
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* Out: %eax
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*/
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.macro read_fw VAR |
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mov $\VAR, %ax
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mov $BIOS_CFG_IOPORT_CFG, %dx |
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outw %ax, (%dx) |
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mov $BIOS_CFG_IOPORT_DATA, %dx |
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inb (%dx), %al |
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shl $8, %eax
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inb (%dx), %al |
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shl $8, %eax
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inb (%dx), %al |
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shl $8, %eax
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inb (%dx), %al |
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bswap %eax |
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.endm |
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/*
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* Read a blob from the fw_cfg device.
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* Requires _ADDR, _SIZE and _DATA values for the parameter.
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*
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* Clobbers: %eax, %edx, %es, %ecx, %edi
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*/
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#define read_fw_blob(var) \
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read_fw var ## _ADDR; \ |
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mov %eax, %edi; \ |
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read_fw var ## _SIZE; \ |
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mov %eax, %ecx; \ |
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mov $var ## _DATA, %ax; \ |
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mov $BIOS_CFG_IOPORT_CFG, %edx; \ |
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outw %ax, (%dx); \ |
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mov $BIOS_CFG_IOPORT_DATA, %dx; \ |
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cld; \ |
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/* old as(1) doesn't like this insn so emit the bytes instead: \
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rep insb (%dx), %es:(%edi); \
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*/ \
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.dc.b 0x67,0xf3,0x6c |
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#define OPTION_ROM_START \
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.code16; \ |
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.text; \ |
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.global _start; \ |
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_start:; \ |
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.short 0xaa55; \ |
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.byte (_end - _start) / 512;
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#define BOOT_ROM_START \
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OPTION_ROM_START \ |
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push %eax; \ |
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push %ds; \ |
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\ |
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/* setup ds so we can access the IVT */ \
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xor %ax, %ax; \ |
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mov %ax, %ds; \ |
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\ |
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/* install our int 19 handler */ \
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movw $int19_handler, (0x19*4); \ |
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mov %cs, (0x19*4+2); \ |
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\ |
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pop %ds; \ |
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pop %eax; \ |
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lret; \ |
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\ |
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int19_handler:; \ |
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/* DS = CS */ \
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movw %cs, %ax; \ |
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movw %ax, %ds; |
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#define OPTION_ROM_END \
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.align 512, 0; \ |
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_end: |
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#define BOOT_ROM_END \
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OPTION_ROM_END |
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