Mirroring from commit 106549a4362f6b499da522f8f8f5ed9f98388f87 from Coreboot upstream

2026-02-17 08:55:05 +10:00
commit 5e919b3ee7
279 changed files with 89283 additions and 0 deletions
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+// 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"
+
+#if CONFIG_VGA_ATI
+#include "ati-tables.S"
+#endif
+
+/****************************************************************
+ * 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
+
+#define VGA_CUSTOM_BDA_FLAGS 0xb9
+#define BF_EXTRA_STACK 0x40
+
+        // Entry point using extra stack
+        DECLFUNC entry_10_extrastack
+entry_10_extrastack:
+        cli
+        cld
+        pushw %ds
+        pushl %eax
+
+        movw $SEG_BDA, %ax      // Check if extra stack is enabled
+        movw %ax, %ds
+        testb $BF_EXTRA_STACK, VGA_CUSTOM_BDA_FLAGS
+        jz 1f
+
+        movw %cs:ExtraStackSeg, %ds // Set %ds:%eax to space on ExtraStack
+        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
+
+1:      // Use regular entry point if the extra stack is disabled
+        popl %eax
+        popw %ds
+        jmp entry_10
+
+        // 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