diff options
Diffstat (limited to 'qemu/roms/seabios/vgasrc/vgaentry.S')
| -rw-r--r-- | qemu/roms/seabios/vgasrc/vgaentry.S | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/qemu/roms/seabios/vgasrc/vgaentry.S b/qemu/roms/seabios/vgasrc/vgaentry.S new file mode 100644 index 000000000..d9ebdb93c --- /dev/null +++ b/qemu/roms/seabios/vgasrc/vgaentry.S @@ -0,0 +1,147 @@ +// Rom layout and bios assembler to C interface. +// +// Copyright (C) 2009-2013 Kevin O'Connor <kevin@koconnor.net> +// +// This file may be distributed under the terms of the GNU LGPLv3 license. + + +#include "asm-offsets.h" // BREGS_* +#include "config.h" // CONFIG_* +#include "entryfuncs.S" // ENTRY_* + + +/**************************************************************** + * Rom Header + ****************************************************************/ + + .section .rom.header + .code16 + .global _rom_header, _rom_header_size, _rom_header_checksum +_rom_header: + .word 0xaa55 +_rom_header_size: + .byte 0 +_rom_header_entry: + jmp _optionrom_entry +_rom_header_checksum: + .byte 0 +_rom_header_other: + .space 17 +_rom_header_pcidata: +#if CONFIG_VGA_PCI == 1 + .word rom_pci_data +#else + .word 0 +#endif +_rom_header_pnpdata: + .word 0 +_rom_header_other2: + .word 0 +_rom_header_signature: + .asciz "IBM" + + +/**************************************************************** + * Entry points + ****************************************************************/ + + // This macro implements a call while avoiding instructions + // that old versions of x86emu have problems with. + .macro VGA_CALLL cfunc +#if CONFIG_VGA_FIXUP_ASM + pushw %ax + callw \cfunc +#else + calll \cfunc +#endif + .endm + + // This macro is the same as ENTRY_ARG except VGA_CALLL is used. + .macro ENTRY_ARG_VGA cfunc + cli + cld + PUSHBREGS + movw %ss, %ax // Move %ss to %ds + movw %ax, %ds + movl %esp, %ebx // Backup %esp, then zero high bits + movzwl %sp, %esp + movl %esp, %eax // First arg is pointer to struct bregs + VGA_CALLL \cfunc + movl %ebx, %esp // Restore %esp (including high bits) + POPBREGS + .endm + + DECLFUNC entry_104f05 +entry_104f05: + ENTRY_ARG_VGA vbe_104f05 + lretw + + DECLFUNC _optionrom_entry +_optionrom_entry: + ENTRY_ARG_VGA vga_post + lretw + + DECLFUNC entry_10 +entry_10: + ENTRY_ARG_VGA handle_10 + iretw + + // Entry point using extra stack + DECLFUNC entry_10_extrastack +entry_10_extrastack: + cli + cld + pushw %ds // Set %ds:%eax to space on ExtraStack + pushl %eax + movw %cs:ExtraStackSeg, %ds + movl $(CONFIG_VGA_EXTRA_STACK_SIZE-PUSHBREGS_size-16), %eax + SAVEBREGS_POP_DSEAX // Save registers on extra stack + movl %esp, PUSHBREGS_size+8(%eax) + movw %ss, PUSHBREGS_size+12(%eax) + popl BREGS_code(%eax) + popw BREGS_flags(%eax) + + movw %ds, %dx // Setup %ss/%esp and call function + movw %dx, %ss + movl %eax, %esp + VGA_CALLL handle_10 + + movl %esp, %eax // Restore registers and return + movw PUSHBREGS_size+12(%eax), %ss + movl PUSHBREGS_size+8(%eax), %esp + popl %edx + popw %dx + pushw BREGS_flags(%eax) + pushl BREGS_code(%eax) + RESTOREBREGS_DSEAX + iretw + + // Timer irq handling + DECLFUNC entry_timer_hook +entry_timer_hook: + ENTRY handle_timer_hook + ljmpw *%cs:Timer_Hook_Resume + + // Timer irq handling on extra stack + DECLFUNC entry_timer_hook_extrastack +entry_timer_hook_extrastack: + cli + cld + pushw %ds // Set %ds:%eax to space on ExtraStack + pushl %eax + movw %cs:ExtraStackSeg, %ds + movl $(CONFIG_VGA_EXTRA_STACK_SIZE-PUSHBREGS_size-8), %eax + SAVEBREGS_POP_DSEAX + movl %esp, PUSHBREGS_size(%eax) + movw %ss, PUSHBREGS_size+4(%eax) + + movw %ds, %dx // Setup %ss/%esp and call function + movw %dx, %ss + movl %eax, %esp + calll handle_timer_hook + + movl %esp, %eax // Restore registers and return + movw PUSHBREGS_size+4(%eax), %ss + movl PUSHBREGS_size(%eax), %esp + RESTOREBREGS_DSEAX + ljmpw *%cs:Timer_Hook_Resume |