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Move common option rom code to header file
We will have a linux boot option rom soon, so let's take all functionality that might be useful for both to a header file that both roms can include. That way we only have to write fw_cfg access code once. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Alexander Graf
Anthony Liguori
parent
77873196f3
commit
dd4b2659cd
@ -18,86 +18,15 @@
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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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#include "optionrom.h"
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#define MULTIBOOT_MAGIC 0x2badb002
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#define GS_PROT_JUMP 0
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#define GS_GDT_DESC 6
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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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/* Read a variable from the fw_cfg device.
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Clobbers: %edx
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Out: %eax */
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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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DEBUG_HERE \
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rep insb (%dx), %es:(%edi);
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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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push %eax
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push %ds
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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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/* 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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pop %ds
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pop %eax
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lret
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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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/* fall through */
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BOOT_ROM_START
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run_multiboot:
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@ -249,6 +178,4 @@ gdt_desc:
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.short (5 * 8) - 1
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.long gdt
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.align 512, 0
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_end:
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BOOT_ROM_END
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107
pc-bios/optionrom/optionrom.h
Normal file
107
pc-bios/optionrom/optionrom.h
Normal file
@ -0,0 +1,107 @@
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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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rep insb (%dx), %es:(%edi);
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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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