590bf491a4
Commit dd4239d657 broke multiboot. It replaced the
instruction "rep insb (%dx), %es:(%edi)" by the binary output of
"addr32 rep insb (%dx), %es:(%di)".
Linuxboot calls the respective helper function in a code16 section. So the
original instruction was automatically translated to its "addr32" equivalent.
For multiboot, we're running in code32 so gcc didn't add the "addr32" which
breaks the instruction.
This patch splits that helper function in one which uses addr32 and one which
does not, so everyone's happy.
The good news is that nobody probably cared so far. The bundled multiboot.bin
binary was built before the change and is thus correct.
Please also put this patch into -stable.
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
127 lines
3.0 KiB
C
127 lines
3.0 KiB
C
/*
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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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#define read_fw_blob_pre(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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/*
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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_blob_pre(var); \
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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 0xf3,0x6c
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/*
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* Read a blob from the fw_cfg device in forced addr32 mode.
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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_addr32(var) \
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read_fw_blob_pre(var); \
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/* old as(1) doesn't like this insn so emit the bytes instead: \
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addr32 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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