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// Rom layout and bios assembler to C interface.
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// Copyright (C) 2009-2013 Kevin O'Connor <kevin@koconnor.net>
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// This file may be distributed under the terms of the GNU LGPLv3 license.
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#include "asm-offsets.h" // BREGS_*
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#include "config.h" // CONFIG_*
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#include "entryfuncs.S" // ENTRY_*
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/****************************************************************
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****************************************************************/
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.global _rom_header, _rom_header_size, _rom_header_checksum
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#if CONFIG_VGA_PCI == 1
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_rom_header_signature:
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/****************************************************************
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****************************************************************/
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// This macro is the same as ENTRY_ARG except the "calll"
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// instruction is avoided to work around known issues in the
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// emulation of some versions of x86emu.
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.macro ENTRY_ARG_VGA cfunc
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movw %ss, %ax // Move %ss to %ds
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movl %esp, %ebx // Backup %esp, then zero high bits
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movl %esp, %eax // First arg is pointer to struct bregs
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pushw %ax ; callw \cfunc
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movl %ebx, %esp // Restore %esp (including high bits)
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ENTRY_ARG_VGA vbe_104f05
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DECLFUNC _optionrom_entry
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ENTRY_ARG_VGA vga_post
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ENTRY_ARG_VGA handle_10
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// Entry point using extra stack
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DECLFUNC entry_10_extrastack
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pushw %ds // Set %ds:%eax to space on ExtraStack
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movw %cs:ExtraStackSeg, %ds
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movl $(CONFIG_VGA_EXTRA_STACK_SIZE-BREGS_size-8), %eax
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popl BREGS_eax(%eax) // Backup registers
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movl %edi, BREGS_edi(%eax)
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movl %esi, BREGS_esi(%eax)
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movl %ebp, BREGS_ebp(%eax)
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movl %ebx, BREGS_ebx(%eax)
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movl %edx, BREGS_edx(%eax)
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movl %ecx, BREGS_ecx(%eax)
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movw %es, BREGS_es(%eax)
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movl %esp, BREGS_size+0(%eax)
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movw %ss, BREGS_size+4(%eax)
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popl BREGS_code(%eax)
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popw BREGS_flags(%eax)
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movw %ds, %dx // Setup %ss/%esp and call function
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pushw %ax ; callw handle_10
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movl %esp, %eax // Restore registers and return
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movw BREGS_size+4(%eax), %ss
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movl BREGS_size+0(%eax), %esp
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pushw BREGS_flags(%eax)
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pushl BREGS_code(%eax)
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movl BREGS_edi(%eax), %edi
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movl BREGS_esi(%eax), %esi
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movl BREGS_ebp(%eax), %ebp
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movl BREGS_ebx(%eax), %ebx
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movl BREGS_edx(%eax), %edx
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movl BREGS_ecx(%eax), %ecx
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movw BREGS_es(%eax), %es
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pushl BREGS_eax(%eax)
added
removed
.pc/vgabios-attempt-to-detect-old-x86emu-and-force-a-fault.diff/vgasrc/vgaentry.S
