dd4239d657
In the spirit of ff56954baf, fix the
build of linuxboot.S with old as(1) (as found in some BSD base systems)
by emitting the bytes of the insn it doesn't like instead.
Signed-off-by: Juergen Lock <nox@jelal.kn-bremen.de>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
111 lines
2.5 KiB
C
111 lines
2.5 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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/*
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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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