diff options
Diffstat (limited to 'qemu/roms/seabios/src/romlayout.S')
-rw-r--r-- | qemu/roms/seabios/src/romlayout.S | 648 |
1 files changed, 0 insertions, 648 deletions
diff --git a/qemu/roms/seabios/src/romlayout.S b/qemu/roms/seabios/src/romlayout.S deleted file mode 100644 index 53cc0f5e3..000000000 --- a/qemu/roms/seabios/src/romlayout.S +++ /dev/null @@ -1,648 +0,0 @@ -// Rom layout and bios assembler to C interface. -// -// Copyright (C) 2008-2012 Kevin O'Connor <kevin@koconnor.net> -// Copyright (C) 2002 MandrakeSoft S.A. -// -// 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_* -#include "hw/rtc.h" // CMOS_RESET_CODE -#include "x86.h" // CR0_* - - .code16 - - -/**************************************************************** - * 16bit / 32bit call trampolines - ****************************************************************/ - -// Place CPU into 32bit mode from 16bit mode. -// %edx = return location (in 32bit mode) -// Clobbers: ecx, flags, segment registers, cr0, idt/gdt - DECLFUNC transition32 - .global transition32_nmi_off -transition32: - // Disable irqs (and clear direction flag) - cli - cld - - // Disable nmi - movl %eax, %ecx - movl $CMOS_RESET_CODE|NMI_DISABLE_BIT, %eax - outb %al, $PORT_CMOS_INDEX - inb $PORT_CMOS_DATA, %al - - // enable a20 - inb $PORT_A20, %al - orb $A20_ENABLE_BIT, %al - outb %al, $PORT_A20 - movl %ecx, %eax - -transition32_nmi_off: - // Set segment descriptors - lidtw %cs:pmode_IDT_info - lgdtw %cs:rombios32_gdt_48 - - // Enable protected mode - movl %cr0, %ecx - andl $~(CR0_PG|CR0_CD|CR0_NW), %ecx - orl $CR0_PE, %ecx - movl %ecx, %cr0 - - // start 32bit protected mode code - ljmpl $SEG32_MODE32_CS, $(BUILD_BIOS_ADDR + 1f) - - .code32 - // init data segments -1: movl $SEG32_MODE32_DS, %ecx - movw %cx, %ds - movw %cx, %es - movw %cx, %ss - movw %cx, %fs - movw %cx, %gs - - jmpl *%edx - .code16 - -// Place CPU into 16bit mode from 32bit mode. -// %edx = return location (in 16bit mode) -// Clobbers: ecx, flags, segment registers, cr0, idt/gdt - DECLFUNC transition16 - .global transition16big - .code32 -transition16: - // Reset data segment limits - movl $SEG32_MODE16_DS, %ecx - movw %cx, %ds - movw %cx, %es - movw %cx, %ss - movw %cx, %fs - movw %cx, %gs - - // Jump to 16bit mode - ljmpw $SEG32_MODE16_CS, $1f - -transition16big: - movl $SEG32_MODE16BIG_DS, %ecx - movw %cx, %ds - movw %cx, %es - movw %cx, %ss - movw %cx, %fs - movw %cx, %gs - - ljmpw $SEG32_MODE16BIG_CS, $1f - - .code16 - // Disable protected mode -1: movl %cr0, %ecx - andl $~CR0_PE, %ecx - movl %ecx, %cr0 - - // far jump to flush CPU queue after transition to real mode - ljmpw $SEG_BIOS, $2f - - // restore IDT to normal real-mode defaults -2: lidtw %cs:rmode_IDT_info - - // Clear segment registers - xorw %cx, %cx - movw %cx, %fs - movw %cx, %gs - movw %cx, %es - movw %cx, %ds - movw %cx, %ss // Assume stack is in segment 0 - - jmpl *%edx - - -/**************************************************************** - * External calling trampolines - ****************************************************************/ - -// Far call a 16bit function from 16bit mode with a specified cpu register state -// %eax = address of struct bregs, %edx = segment of struct bregs -// Clobbers: %e[bc]x, %e[ds]i, flags - DECLFUNC __farcall16 -__farcall16: - // Save %edx/%eax, %ebp - pushl %ebp - pushl %eax - pushl %edx - - // Setup for iretw call - movl %edx, %ds - pushw %cs - pushw $1f // return point - pushw BREGS_flags(%eax) // flags - pushl BREGS_code(%eax) // CS:IP - - // Load calling registers and invoke call - RESTOREBREGS_DSEAX - iretw // XXX - just do a lcalll -1: - // Store flags, es, eax - pushfw - cli - cld - pushw %ds - pushl %eax - movw 0x08(%esp), %ds - movl 0x0c(%esp), %eax - SAVEBREGS_POP_DSEAX - popw BREGS_flags(%eax) - movw %ss, %cx - movw %cx, %ds // Restore %ds == %ss - - // Remove %edx/%eax, restore %ebp - popl %edx - popl %eax - popl %ebp - - retl - -// IRQ trampolines - .macro IRQ_TRAMPOLINE num - DECLFUNC irq_trampoline_0x\num - irq_trampoline_0x\num : - int $0x\num - lretw - .endm - - IRQ_TRAMPOLINE 02 - IRQ_TRAMPOLINE 10 - IRQ_TRAMPOLINE 13 - IRQ_TRAMPOLINE 15 - IRQ_TRAMPOLINE 16 - IRQ_TRAMPOLINE 18 - IRQ_TRAMPOLINE 19 - IRQ_TRAMPOLINE 1c - IRQ_TRAMPOLINE 4a - - -/**************************************************************** - * Misc. entry points. - ****************************************************************/ - -// Entry point for QEMU smi interrupts. - DECLFUNC entry_smi -entry_smi: - // Transition to 32bit mode. - movl $1f + BUILD_BIOS_ADDR, %edx - jmp transition32_nmi_off - .code32 -1: movl $BUILD_SMM_ADDR + 0x8000, %esp - calll _cfunc32flat_handle_smi - BUILD_BIOS_ADDR - rsm - .code16 - -// Entry point for QEMU smp sipi interrupts. - DECLFUNC entry_smp -entry_smp: - // Transition to 32bit mode. - cli - cld - movl $2f + BUILD_BIOS_ADDR, %edx - jmp transition32_nmi_off - .code32 - // Acquire lock and take ownership of shared stack -1: rep ; nop -2: lock btsl $0, SMPLock - jc 1b - movl SMPStack, %esp - // Call handle_smp - calll _cfunc32flat_handle_smp - BUILD_BIOS_ADDR - // Release lock and halt processor. - movl $0, SMPLock -3: hlt - jmp 3b - .code16 - -// Resume (and reboot) entry point - called from entry_post - DECLFUNC entry_resume -entry_resume: - // Disable interrupts - cli - cld - // Use the ExtraStack in low mem. - movl $_zonelow_seg, %eax - movw %ax, %ds - movw %ax, %ss - movl $ExtraStack + BUILD_EXTRA_STACK_SIZE, %esp - // Call handler. - jmp handle_resume - -// PMM entry point - DECLFUNC entry_pmm -entry_pmm: - pushl %esp // Backup %esp, then clear high bits - movzwl %sp, %esp - pushfl // Save registers clobbered by C code - cli - cld - PUSHBREGS - movl %ss, %ecx // Move %ss to %ds - movw %cx, %ds - shll $4, %ecx - movl $_cfunc32flat_handle_pmm, %eax // Setup: call32(handle_pmm, args, -1) - leal PUSHBREGS_size+12(%esp, %ecx), %edx // %edx points to start of args - movl $-1, %ecx - calll __call32 - movw %ax, BREGS_eax(%esp) // Modify %ax:%dx to return %eax - shrl $16, %eax - movw %ax, BREGS_edx(%esp) - POPBREGS - popfl - popl %esp - lretw - -// PnP entry points - DECLFUNC entry_pnp_real - .global entry_pnp_prot -entry_pnp_prot: - pushl %esp - jmp 1f -entry_pnp_real: - pushl %esp // Backup %esp, then clear high bits - movzwl %sp, %esp -1: - pushfl // Save registers clobbered by C code - cli - cld - PUSHBREGS - movw %ss, %cx // Move %ss to %ds - movw %cx, %ds - leal PUSHBREGS_size+12(%esp), %eax // %eax points to start of u16 args - calll handle_pnp - movw %ax, BREGS_eax(%esp) // Modify %eax to return %ax - POPBREGS - popfl - popl %esp - lretw - -// APM entry points - DECLFUNC entry_apm16 -entry_apm16: - pushfw // save flags - pushl %eax // dummy - ENTRY_ARG handle_apm - addw $4, %sp // pop dummy - popfw // restore flags - lretw - - DECLFUNC entry_apm32 - .code32 -entry_apm32: - pushfl - pushl %gs - pushl %cs // Move second descriptor after %cs to %gs - addl $16, (%esp) - popl %gs - ENTRY_ARG_ESP _cfunc32seg_handle_apm - popl %gs - popfl - lretl - .code16 - -// PCI-BIOS entry points - DECLFUNC entry_pcibios32 - .code32 -entry_pcibios32: - pushfl - pushl %gs // Backup %gs and set %gs=%ds - pushl %ds - popl %gs - ENTRY_ARG_ESP _cfunc32seg_handle_pcibios - popl %gs - popfl - lretl - .code16 - - DECLFUNC entry_pcibios16 -entry_pcibios16: - ENTRY_ARG handle_pcibios - iretw - -// int 1589 entry point - DECLFUNC entry_1589 -entry_1589: - ENTRY_ARG handle_1589 - iretw - -// BIOS32 support - DECLFUNC entry_bios32 - .code32 -entry_bios32: - pushfl -#if CONFIG_PCIBIOS - // Check for PCI-BIOS request - cmpl $0x49435024, %eax // $PCI - jne 1f - movl $BUILD_BIOS_ADDR, %ebx - movl $BUILD_BIOS_SIZE, %ecx - movl $entry_pcibios32, %edx - xorb %al, %al - jmp 2f -#endif - // Unknown request -1: movb $0x80, %al - // Return to caller -2: popfl - lretl - .code16 - -// 32bit elf entry point - DECLFUNC entry_elf - .code32 -entry_elf: - cli - cld - movl %eax, entry_elf_eax - movl %ebx, entry_elf_ebx - lidtl (BUILD_BIOS_ADDR + pmode_IDT_info) - lgdtl (BUILD_BIOS_ADDR + rombios32_gdt_48) - movl $SEG32_MODE32_DS, %eax - movw %ax, %ds - movw %ax, %es - movw %ax, %fs - movw %ax, %gs - movw %ax, %ss - movl $BUILD_STACK_ADDR, %esp - ljmpl $SEG32_MODE32_CS, $_cfunc32flat_handle_post - .code16 - -// UEFI Compatibility Support Module (CSM) entry point - DECLFUNC entry_csm -entry_csm: - // Backup register state - pushfw - cli - cld - pushl %eax // dummy - PUSHBREGS - - // Backup stack location and convert to a "flat pointer" - movl %ss, %eax - movw %ax, BREGS_code+2(%esp) // Store %ss in bregs->code.seg - shll $4, %eax - addl %esp, %eax - - // Change to BUILD_STACK_ADDR stack and call handle_csm(bregs) - ENTRY_INTO32 _cfunc32flat_handle_csm - - DECLFUNC __csm_return - .code32 -__csm_return: - movl $1f, %edx - jmp transition16big - .code16 - - // Switch back to original stack -1: movzwl BREGS_code+2(%eax), %edx - movl %edx, %ecx - shll $4, %ecx - subl %ecx, %eax - movl %edx, %ss - movl %eax, %esp - - // Restore register state and return. - POPBREGS - addw $4, %sp // pop dummy - popfw - lretw - - -/**************************************************************** - * Interrupt entry points - ****************************************************************/ - - // Main entry point for hardware interrupts handled on extra stack - DECLFUNC irqentry_extrastack -irqentry_extrastack: - cli - cld - pushw %ds // Set %ds:%eax to space on ExtraStack - pushl %eax - movl $_zonelow_seg, %eax - movl %eax, %ds - movl StackPos, %eax - subl $PUSHBREGS_size+8, %eax - SAVEBREGS_POP_DSEAX - popl %ecx - 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 *%ecx - - movl %esp, %eax // Restore registers and return - movw PUSHBREGS_size+4(%eax), %ss - movl PUSHBREGS_size(%eax), %esp - RESTOREBREGS_DSEAX - iretw - - // Main entry point for software interrupts handled on extra stack - DECLFUNC irqentry_arg_extrastack -irqentry_arg_extrastack: - cli - cld - pushw %ds // Set %ds:%eax to space on ExtraStack - pushl %eax - movl $_zonelow_seg, %eax - movl %eax, %ds - movl StackPos, %eax - subl $PUSHBREGS_size+16, %eax - SAVEBREGS_POP_DSEAX // Save registers on extra stack - popl %ecx - 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 - calll *%ecx - - 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 - - // Main entry point for software interrupts (using caller's stack) - DECLFUNC irqentry_arg -irqentry_arg: - ENTRY_ARG_ST - iretw - - // Helper macros for hardware interrupt declaration - .macro IRQ_ENTRY num - .global entry_\num - entry_\num : - pushl $ handle_\num - jmp irqentry_extrastack - .endm - - .macro DECL_IRQ_ENTRY num - DECLFUNC entry_\num - IRQ_ENTRY \num - .endm - - // Helper macros for software interrupt declaration - .macro IRQ_ENTRY_ARG num - .global entry_\num - entry_\num : - pushl $ handle_\num -#if CONFIG_ENTRY_EXTRASTACK - jmp irqentry_arg_extrastack -#else - jmp irqentry_arg -#endif - .endm - - .macro DECL_IRQ_ENTRY_ARG num - DECLFUNC entry_\num - IRQ_ENTRY_ARG \num - .endm - - // Various entry points (that don't require a fixed location). - DECL_IRQ_ENTRY_ARG 13 - DECL_IRQ_ENTRY 76 - DECL_IRQ_ENTRY 70 - DECL_IRQ_ENTRY 74 - DECL_IRQ_ENTRY 75 - DECL_IRQ_ENTRY hwpic1 - DECL_IRQ_ENTRY hwpic2 - - // int 18/19 are special - they reset stack and call into 32bit mode. - DECLFUNC entry_19 -entry_19: - ENTRY_INTO32 _cfunc32flat_handle_19 - - DECLFUNC entry_18 -entry_18: - ENTRY_INTO32 _cfunc32flat_handle_18 - - -/**************************************************************** - * Fixed position entry points - ****************************************************************/ - - // Specify a location in the fixed part of bios area. - .macro ORG addr - .section .fixedaddr.\addr - .endm - - ORG 0xe05b -entry_post: - cmpl $0, %cs:HaveRunPost // Check for resume/reboot - jnz entry_resume - ENTRY_INTO32 _cfunc32flat_handle_post // Normal entry point - - ORG 0xe2c3 - .global entry_02 -entry_02: - ENTRY handle_02 // NMI handler does not switch onto extra stack - iretw - - ORG 0xe3fe - .global entry_13_official -entry_13_official: - jmp entry_13 - - // 0xe401 - OldFDPT in misc.c - - ORG 0xe6f2 - .global entry_19_official -entry_19_official: - jmp entry_19 - - // 0xe6f5 - BIOS_CONFIG_TABLE in misc.c - - // 0xe729 - BaudTable in misc.c - - ORG 0xe739 - IRQ_ENTRY_ARG 14 - - ORG 0xe82e - IRQ_ENTRY_ARG 16 - - ORG 0xe987 - IRQ_ENTRY 09 - - ORG 0xec59 - IRQ_ENTRY_ARG 40 - - ORG 0xef57 - IRQ_ENTRY 0e - - // 0xefc7 - diskette_param_table in misc.c - - ORG 0xefd2 - IRQ_ENTRY_ARG 17 - - ORG 0xf045 -entry_10_0x0f: - // XXX - INT 10 Functions 0-Fh Entry Point - iretw - - ORG 0xf065 - IRQ_ENTRY_ARG 10 - - // 0xf0a4 - VideoParams in misc.c - - ORG 0xf841 - IRQ_ENTRY_ARG 12 - - ORG 0xf84d - IRQ_ENTRY_ARG 11 - - ORG 0xf859 - .global entry_15_official -entry_15_official: - cmpb $0x89, %ah - je entry_1589 // 1589 calls return in protected mode - IRQ_ENTRY_ARG 15 - - // 0xfa6e - vgafont8 in font.c - - ORG 0xfe6e - .global entry_1a_official -entry_1a_official: - cmpb $0xb1, %ah - je entry_pcibios16 // PCIBIOS calls can be in protected mode - IRQ_ENTRY_ARG 1a - - ORG 0xfea5 - IRQ_ENTRY 08 - - // 0xfef3 - InitVectors in misc.c - - ORG 0xff53 - .global entry_iret_official -entry_iret_official: - iretw - - ORG 0xff54 - IRQ_ENTRY_ARG 05 - - ORG 0xfff0 // Power-up Entry Point - .global reset_vector -reset_vector: - ljmpw $SEG_BIOS, $entry_post - - // 0xfff5 - BiosDate in misc.c - - // 0xfffe - BiosModelId in misc.c - - // 0xffff - BiosChecksum in misc.c - - .end |