diff options
Diffstat (limited to 'pc-bios/optionrom/optionrom.h')
| -rw-r--r-- | pc-bios/optionrom/optionrom.h | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/pc-bios/optionrom/optionrom.h b/pc-bios/optionrom/optionrom.h new file mode 100644 index 0000000000..34d69af898 --- /dev/null +++ b/pc-bios/optionrom/optionrom.h @@ -0,0 +1,107 @@ +/* + * Common Option ROM Functions + * + * This program 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 2 of the License, or + * (at your option) any later version. + * + * This program 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 this program; if not, see <http://www.gnu.org/licenses/>. + * + * Copyright Novell Inc, 2009 + * Authors: Alexander Graf <agraf@suse.de> + */ + + +#define NO_QEMU_PROTOS +#include "../../hw/fw_cfg.h" + +#define BIOS_CFG_IOPORT_CFG 0x510 +#define BIOS_CFG_IOPORT_DATA 0x511 + +/* Break the translation block flow so -d cpu shows us values */ +#define DEBUG_HERE \ + jmp 1f; \ + 1: + +/* + * Read a variable from the fw_cfg device. + * Clobbers: %edx + * Out: %eax + */ +.macro read_fw VAR + mov $\VAR, %ax + mov $BIOS_CFG_IOPORT_CFG, %dx + outw %ax, (%dx) + mov $BIOS_CFG_IOPORT_DATA, %dx + inb (%dx), %al + shl $8, %eax + inb (%dx), %al + shl $8, %eax + inb (%dx), %al + shl $8, %eax + inb (%dx), %al + bswap %eax +.endm + +/* + * Read a blob from the fw_cfg device. + * Requires _ADDR, _SIZE and _DATA values for the parameter. + * + * Clobbers: %eax, %edx, %es, %ecx, %edi + */ +#define read_fw_blob(var) \ + read_fw var ## _ADDR; \ + mov %eax, %edi; \ + read_fw var ## _SIZE; \ + mov %eax, %ecx; \ + mov $var ## _DATA, %ax; \ + mov $BIOS_CFG_IOPORT_CFG, %edx; \ + outw %ax, (%dx); \ + mov $BIOS_CFG_IOPORT_DATA, %dx; \ + cld; \ + rep insb (%dx), %es:(%edi); + +#define OPTION_ROM_START \ + .code16; \ + .text; \ + .global _start; \ + _start:; \ + .short 0xaa55; \ + .byte (_end - _start) / 512; + +#define BOOT_ROM_START \ + OPTION_ROM_START \ + push %eax; \ + push %ds; \ + \ + /* setup ds so we can access the IVT */ \ + xor %ax, %ax; \ + mov %ax, %ds; \ + \ + /* install our int 19 handler */ \ + movw $int19_handler, (0x19*4); \ + mov %cs, (0x19*4+2); \ + \ + pop %ds; \ + pop %eax; \ + lret; \ + \ + int19_handler:; \ + /* DS = CS */ \ + movw %cs, %ax; \ + movw %ax, %ds; + +#define OPTION_ROM_END \ + .align 512, 0; \ + _end: + +#define BOOT_ROM_END \ + OPTION_ROM_END + |