X-Git-Url: http://wien.tomnetworks.com/gitweb/?a=blobdiff_plain;f=src%2Fromlayout.S;h=5983a4a7b1c615e64acba65d30674078a8fedb0e;hb=refs%2Fheads%2Fcoreboot;hp=2fd0f839c5ae57df148ae9ede4737eb93ae36e79;hpb=1d01951aae985073e81a4332a7ad29ceb9294db7;p=seabios.git diff --git a/src/romlayout.S b/src/romlayout.S index 2fd0f83..5983a4a 100644 --- a/src/romlayout.S +++ b/src/romlayout.S @@ -1,112 +1,24 @@ // Rom layout and bios assembler to C interface. // -// Copyright (C) 2008 Kevin O'Connor +// Copyright (C) 2008,2009 Kevin O'Connor // Copyright (C) 2002 MandrakeSoft S.A. // -// This file may be distributed under the terms of the GNU GPLv3 license. - -#include "config.h" - -#define PROTECTED_MODE_CS (2 << 3) // 0x10 -#define PROTECTED_MODE_DS (3 << 3) // 0x18 -#define REAL_MODE_CS (4 << 3) // 0x20 -#define REAL_MODE_DS (5 << 3) // 0x28 - - .code16gcc +// This file may be distributed under the terms of the GNU LGPLv3 license. /**************************************************************** * Include of 16bit C code ****************************************************************/ - .globl bios16c_start, bios16c_end -bios16c_start: -.include "out/blob.proc.16.s" - .text -bios16c_end: - - -/**************************************************************** - * Entry macros - ****************************************************************/ - - // Call a C function - this does the minimal work necessary to - // call into C. It sets up %ds, backs up %es, and backs up - // those registers that are call clobbered by the C compiler. - .macro ENTRY cfunc - cld - pushl %eax - pushl %ecx - pushl %edx - pushw %es - pushw %ds - movw %ss, %ax - movw %ax, %ds - calll \cfunc - popw %ds - popw %es - popl %edx - popl %ecx - popl %eax - .endm - - // Call a C function with current register list as an - // argument. This backs up the registers and sets %eax - // to point to the backup. On return, the registers are - // restored from the structure. - .macro ENTRY_ARG cfunc - cld - pushl %eax - pushl %ecx - pushl %edx - pushl %ebx - pushl %esi - pushl %edi - pushw %es - pushw %ds - movw %ss, %ax - movw %ax, %ds - movzwl %sp, %esp - movl %esp, %eax - calll \cfunc - popw %ds - popw %es - popl %edi - popl %esi - popl %ebx - popl %edx - popl %ecx - popl %eax - .endm - - // Macro to reset the 16bit stack - // Clobbers %ax - .macro RESET_STACK - xorw %ax, %ax - movw %ax, %ss - movl $ CONFIG_STACK_OFFSET , %esp - .endm - - -/**************************************************************** - * POST handler - ****************************************************************/ - - .org 0xe05b - .globl post16 -post16: - // init the stack pointer - RESET_STACK - - // Set entry point of rombios32 code - the actual address - // is altered later in the build process. - .globl set_entry32 -set_entry32: - pushl $0xf0000000 - - cld + .code16gcc +#include "ccode.16.s" - // Fall through to transition32 function below +#include "config.h" // CONFIG_* +#include "ioport.h" // PORT_A20 +#include "bregs.h" // CR0_* +#include "cmos.h" // CMOS_RESET_CODE +#include "asm-offsets.h" // BREGS_* +#include "entryfuncs.S" // ENTRY_* /**************************************************************** @@ -114,73 +26,102 @@ set_entry32: ****************************************************************/ // Place CPU into 32bit mode from 16bit mode. -// Clobbers: %eax, flags, stack registers, cr0, idt/gdt +// %edx = return location (in 32bit mode) +// Clobbers: ecx, flags, segment registers, cr0, idt/gdt + DECLFUNC transition32 transition32: - // Disable irqs + movl %eax, %ecx + + // Disable irqs (and clear direction flag) cli + cld + + // Disable nmi + movl $CMOS_RESET_CODE|NMI_DISABLE_BIT, %eax + outb %al, $PORT_CMOS_INDEX + inb $PORT_CMOS_DATA, %al // enable a20 - inb $0x92, %al - orb $0x02, %al - outb %al, $0x92 + inb $PORT_A20, %al + orb $A20_ENABLE_BIT, %al + outb %al, $PORT_A20 // Set segment descriptors - lidt %cs:pmode_IDT_info - lgdt %cs:rombios32_gdt_48 + lidtw %cs:pmode_IDT_info + lgdtw %cs:rombios32_gdt_48 - // set PE bit in CR0 - movl %cr0, %eax - orb $0x01, %al - movl %eax, %cr0 + // Enable protected mode + movl %cr0, %eax + orl $CR0_PE, %eax + movl %eax, %cr0 - // start protected mode code - // ljmpl $PROTECTED_MODE_CS, $(1f | 0xf0000) - .word 0xea66, 1f, 0x000f, PROTECTED_MODE_CS + // start 32bit protected mode code + ljmpl $SEG32_MODE32_CS, $(BUILD_BIOS_ADDR + 1f) .code32 1: // init data segments - movl $PROTECTED_MODE_DS, %eax + movl $SEG32_MODE32_DS, %eax movw %ax, %ds movw %ax, %es movw %ax, %ss - xorl %eax, %eax movw %ax, %fs movw %ax, %gs - retl + movl %ecx, %eax + jmpl *%edx -// Call a 16bit function from 32bit mode. -// %eax = address of struct bregs -// Clobbers: all gp registers, flags, stack registers, cr0, idt/gdt - .globl __call16_from32 -__call16_from32: - pushl %eax +// 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 +transition16: + movl %eax, %ecx + + // restore data segment limits to 0xffff + movl $SEG32_MODE16_DS, %eax + movw %ax, %ds + movw %ax, %es + movw %ax, %ss + movw %ax, %fs + movw %ax, %gs + +#if CONFIG_DISABLE_A20 + // disable a20 + inb $PORT_A20, %al + andb $~A20_ENABLE_BIT, %al + outb %al, $PORT_A20 +#endif // Jump to 16bit mode - ljmp $REAL_MODE_CS, $1f + ljmpw $SEG32_MODE16_CS, $1f - .code16gcc -1: - // restore data segment limits to 0xffff - movw $REAL_MODE_DS, %ax +transition16big: + movl %eax, %ecx + + movl $SEG32_MODE16BIG_DS, %eax movw %ax, %ds movw %ax, %es movw %ax, %ss movw %ax, %fs movw %ax, %gs - // reset PE bit in CR0 + ljmpw $SEG32_MODE16BIG_CS, $1f + + .code16gcc +1: + // Disable protected mode movl %cr0, %eax - andb $0xfe, %al + andl $~CR0_PE, %eax movl %eax, %cr0 // far jump to flush CPU queue after transition to real mode - ljmpw $0xf000, $2f + ljmpw $SEG_BIOS, $2f 2: // restore IDT to normal real-mode defaults - lidt %cs:rmode_IDT_info + lidtw %cs:rmode_IDT_info // Clear segment registers xorw %ax, %ax @@ -190,34 +131,34 @@ __call16_from32: movw %ax, %ds movw %ax, %ss // Assume stack is in segment 0 - popl %eax - pushl $transition32 - - // Fall through to __call16 - + movl %ecx, %eax + jmpl *%edx // Call a 16bit function from 16bit mode with a specified cpu register state // %eax = address of struct bregs -// Clobbers: all gp registers, es - .globl __call16 +// Clobbers: %e[bcd]x, %e[ds]i, flags + DECLFUNC __call16 __call16: - // Save eax + // Save %eax, %ebp + pushl %ebp pushl %eax // Setup for iretw call - pushw $0xf000 + pushw %cs pushw $1f // return point - pushw 0x20(%eax) // flags - pushl 0x1c(%eax) // CS:IP + pushw BREGS_flags(%eax) // flags + pushl BREGS_code(%eax) // CS:IP // Load calling registers. - movl 0x04(%eax), %edi - movl 0x08(%eax), %esi - movl 0x0c(%eax), %ebx - movl 0x10(%eax), %edx - movl 0x14(%eax), %ecx - movw 0x02(%eax), %es // XXX - should load %ds too - movl 0x18(%eax), %eax + movl BREGS_edi(%eax), %edi + movl BREGS_esi(%eax), %esi + movl BREGS_ebp(%eax), %ebp + movl BREGS_ebx(%eax), %ebx + movl BREGS_edx(%eax), %edx + movl BREGS_ecx(%eax), %ecx + movw BREGS_es(%eax), %es + movw BREGS_ds(%eax), %ds + movl %ss:BREGS_eax(%eax), %eax // Invoke call iretw // XXX - just do a lcalll @@ -226,259 +167,388 @@ __call16: pushfw pushl %eax movl 0x06(%esp), %eax - movl %ecx, %ss:0x14(%eax) // Save %ecx + movl %ecx, %ss:BREGS_ecx(%eax) + movw %ds, %ss:BREGS_ds(%eax) movw %ss, %cx - movw %cx, %ds // Restore %ds == %ss + movw %cx, %ds // Restore %ds == %ss popl %ecx - movl %ecx, 0x18(%eax) // Save %eax + movl %ecx, BREGS_eax(%eax) popw %cx - movw %cx, 0x20(%eax) // Save flags + movw %cx, BREGS_flags(%eax) // Store remaining registers - movw %es, 0x02(%eax) - movl %edi, 0x04(%eax) - movl %esi, 0x08(%eax) - movl %ebx, 0x0c(%eax) - movl %edx, 0x10(%eax) - - // Remove %eax + movw %es, BREGS_es(%eax) + movl %edi, BREGS_edi(%eax) + movl %esi, BREGS_esi(%eax) + movl %ebp, BREGS_ebp(%eax) + movl %ebx, BREGS_ebx(%eax) + movl %edx, BREGS_edx(%eax) + + // Remove %eax, restore %ebp popl %eax + popl %ebp + + retl + +// Call a 16bit function from 32bit mode. +// %eax = address of struct bregs +// Clobbers: %e[bcd]x, %e[ds]i, flags, segment registers, idt/gdt + DECLFUNC __call16_from32 + .global __call16big_from32 + .code32 +__call16_from32: + movl $1f, %edx + jmp transition16 +__call16big_from32: + movl $1f, %edx + jmp transition16big + + // Make call. + .code16gcc +1: calll __call16 + // Return via transition32 + movl $(2f + BUILD_BIOS_ADDR), %edx + jmp transition32 + .code32 +2: retl + + .code16gcc +// IRQ trampolines + .macro IRQ_TRAMPOLINE num + DECLFUNC irq_trampoline_0x\num + irq_trampoline_0x\num : + int $0x\num + lretw + .endm + + IRQ_TRAMPOLINE 10 + IRQ_TRAMPOLINE 13 + IRQ_TRAMPOLINE 15 + IRQ_TRAMPOLINE 16 + IRQ_TRAMPOLINE 18 + IRQ_TRAMPOLINE 19 + + +/**************************************************************** + * Misc. entry points. + ****************************************************************/ +// Resume (and reboot) entry point - called from entry_post + DECLFUNC entry_resume +entry_resume: + // Disable interrupts + cli cld + // Use a stack in EBDA + movw $SEG_BDA, %ax + movw %ax, %ds + movw BDA_ebda_seg, %ax + movw %ax, %ds + movw %ax, %ss + movl $EBDA_OFFSET_TOP_STACK, %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 + pushl %eax + pushl %ecx + pushl %edx + pushw %es + pushw %ds + movw %ss, %cx // Move %ss to %ds + movw %cx, %ds + movl $_cfunc32flat_handle_pmm, %eax // Setup: call32(handle_pmm, args, -1) + leal 28(%esp), %edx // %edx points to start of args + movl $-1, %ecx + calll call32 + movw %ax, 12(%esp) // Modify %ax:%dx to return %eax + shrl $16, %eax + movw %ax, 4(%esp) + popw %ds // Restore saved registers + popw %es + popl %edx + popl %ecx + popl %eax + popfl + popl %esp + lretw - retl +// 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 + pushl %eax + pushl %ecx + pushl %edx + pushw %es + pushw %ds + movw %ss, %cx // Move %ss to %ds + movw %cx, %ds + leal 28(%esp), %eax // %eax points to start of u16 args + calll handle_pnp + movw %ax, 12(%esp) // Modify %eax to return %ax + popw %ds + popw %es + popl %edx + popl %ecx + popl %eax + popfl + popl %esp + lretw - // APM trampolines - .globl apm16protected_entry -apm16protected_entry: +// APM entry points + DECLFUNC entry_apm16 +entry_apm16: pushfw // save flags pushl %eax // dummy - ENTRY_ARG handle_1553 + ENTRY_ARG handle_apm16 addw $4, %sp // pop dummy popfw // restore flags lretw .code32 - .globl apm32protected_entry -apm32protected_entry: - pushfw // save flags - pushw %cs // Setup for long jump to 16bitmode - incw (%esp) - pushw 1f - lcallw *(%esp) - addl $4, %esp // pop call address - popfw + DECLFUNC entry_apm32 +entry_apm32: + pushfl + pushl %gs + pushl %cs // Move second descriptor after %cs to %gs + addl $16, (%esp) + popl %gs + ENTRY_ARG_ESP _cfunc32seg_handle_apm32 + popl %gs + popfl lretl - .code16gcc -1: // 16bit entry point for apm32 code. - ENTRY_ARG handle_1553 - lretw +// PCI-BIOS 32bit entry point + DECLFUNC entry_pcibios32 +entry_pcibios32: + pushfl + pushl %gs // Backup %gs and set %gs=%ds + pushl %ds + popl %gs + ENTRY_ARG_ESP _cfunc32seg_handle_pcibios32 + popl %gs + popfl + lretl -/**************************************************************** - * GDT and IDT tables - ****************************************************************/ +// BIOS32 support + EXPORTFUNC entry_bios32 +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 -// Protected mode IDT descriptor -// -// I just make the limit 0, so the machine will shutdown -// if an exception occurs during protected mode memory -// transfers. -// -// Set base to f0000 to correspond to beginning of BIOS, -// in case I actually define an IDT later -// Set limit to 0 -pmode_IDT_info: - .word 0x0000 // limit 15:00 - .long 0xf0000 // base 16:47 - -// Real mode IDT descriptor -// -// Set to typical real-mode values. -// base = 000000 -// limit = 03ff -rmode_IDT_info: - .word 0x03ff // limit 15:00 - .long 0 // base 16:47 - -rombios32_gdt_48: - .word 0x30 - .word rombios32_gdt - .word 0x000f - - .balign 8 -rombios32_gdt: - .word 0, 0, 0, 0 - .word 0, 0, 0, 0 - // 32 bit flat code segment (PROTECTED_MODE_CS) - .word 0xffff, 0, 0x9b00, 0x00cf - // 32 bit flat data segment (PROTECTED_MODE_DS) - .word 0xffff, 0, 0x9300, 0x00cf - // 16 bit code segment base=0xf0000 limit=0xffff (REAL_MODE_CS) - .word 0xffff, 0, 0x9b0f, 0x0000 - // 16 bit data segment base=0x0 limit=0xffff (REAL_MODE_DS) - .word 0xffff, 0, 0x9300, 0x0000 +// 32bit elf entry point + EXPORTFUNC entry_elf +entry_elf: + cli + cld + 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 + + .code16gcc /**************************************************************** * Interrupt entry points ****************************************************************/ + // Main entry point for interrupts without args + DECLFUNC irqentry +irqentry: + ENTRY_ST + iretw + + // Main entry point for interrupts with args + DECLFUNC irqentryarg +irqentryarg: + ENTRY_ARG_ST + iretw + // Define an entry point for an interrupt (no args passed). .macro IRQ_ENTRY num - .globl entry_\num + .global entry_\num entry_\num : - cli // In case something far-calls instead of using "int" - ENTRY handle_\num - iretw + pushl $ handle_\num + jmp irqentry + .endm + + .macro DECL_IRQ_ENTRY num + DECLFUNC entry_\num + IRQ_ENTRY \num .endm // Define an entry point for an interrupt (can read/modify args). .macro IRQ_ENTRY_ARG num - .globl entry_\num + .global entry_\num entry_\num : - cli // In case something far-calls instead of using "int" - ENTRY_ARG handle_\num - iretw + pushl $ handle_\num + jmp irqentryarg .endm - .org 0xe2c3 - IRQ_ENTRY nmi + .macro DECL_IRQ_ENTRY_ARG num + DECLFUNC entry_\num + IRQ_ENTRY_ARG \num + .endm - IRQ_ENTRY_ARG 13 - IRQ_ENTRY_ARG 12 - IRQ_ENTRY_ARG 11 - IRQ_ENTRY 76 - IRQ_ENTRY 1c - IRQ_ENTRY 70 - IRQ_ENTRY 74 + // 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 - .org 0xe3fe - jmp entry_13 + DECLFUNC entry_18 +entry_18: + ENTRY_INTO32 _cfunc32flat_handle_18 - .org 0xe401 - // XXX - Fixed Disk Parameter Table - .org 0xe6f2 - jmp entry_19 +/**************************************************************** + * Fixed position entry points + ****************************************************************/ - .org 0xe6f5 -.include "out/cbt.proc.16.s" - .text + // Specify a location in the fixed part of bios area. + .macro ORG addr + .section .fixedaddr.\addr + .endm - .org 0xe729 - // XXX - Baud Rate Generator Table + ORG 0xe05b +entry_post: + cmpl $0, %cs:HaveRunPost // Check for resume/reboot + jnz entry_resume + ENTRY_INTO32 _cfunc32flat_handle_post // Normal entry point - .org 0xe739 - IRQ_ENTRY_ARG 14 + ORG 0xe2c3 + IRQ_ENTRY 02 - IRQ_ENTRY 75 + ORG 0xe3fe + .global entry_13_official +entry_13_official: + jmp entry_13 - // int 18/19 are special - they reset the stack and do not return. - .globl entry_19 -entry_19: - RESET_STACK - ENTRY handle_19 + // 0xe401 - OldFDPT in disk.c - .globl entry_18 -entry_18: - RESET_STACK - ENTRY handle_18 + ORG 0xe6f2 + .global entry_19_official +entry_19_official: + jmp entry_19 - // IRQ trampolines - .macro IRQ_TRAMPOLINE num - .globl irq_trampoline_0x\num - irq_trampoline_0x\num : - int $0x\num - lretw - .endm + // 0xe6f5 - BIOS_CONFIG_TABLE in misc.c - IRQ_TRAMPOLINE 02 - IRQ_TRAMPOLINE 10 - IRQ_TRAMPOLINE 13 - IRQ_TRAMPOLINE 15 - IRQ_TRAMPOLINE 18 - IRQ_TRAMPOLINE 19 - IRQ_TRAMPOLINE 1c - IRQ_TRAMPOLINE 4a + // 0xe729 - BaudTable in serial.c + + ORG 0xe739 + IRQ_ENTRY_ARG 14 - .org 0xe82e + ORG 0xe82e IRQ_ENTRY_ARG 16 - .org 0xe987 + ORG 0xe987 IRQ_ENTRY 09 - .org 0xec59 + ORG 0xec59 IRQ_ENTRY_ARG 40 - .org 0xef57 + ORG 0xef57 IRQ_ENTRY 0e - .org 0xefc7 -.include "out/floppy_dbt.proc.16.s" - .text + // 0xefc7 - diskette_param_table in floppy.c - .org 0xefd2 + ORG 0xefd2 IRQ_ENTRY_ARG 17 - .org 0xf045 - // XXX int 10 + ORG 0xf045 +entry_10_0x0f: + // XXX - INT 10 Functions 0-Fh Entry Point iretw - .org 0xf065 + ORG 0xf065 IRQ_ENTRY_ARG 10 - .org 0xf0a4 - // XXX int 1D - iretw - - .globl freespace2_start, freespace2_end -freespace2_start: + // 0xf0a4 - VideoParams in misc.c - .org 0xf841 -freespace2_end: - jmp entry_12 + ORG 0xf841 + IRQ_ENTRY_ARG 12 - .org 0xf84d - jmp entry_11 + ORG 0xf84d + IRQ_ENTRY_ARG 11 - .org 0xf859 + ORG 0xf859 IRQ_ENTRY_ARG 15 - .org 0xfa6e -.include "out/font.proc.16.s" - .text + // 0xfa6e - vgafont8 in font.c - .org 0xfe6e + ORG 0xfe6e IRQ_ENTRY_ARG 1a - .org 0xfea5 + ORG 0xfea5 IRQ_ENTRY 08 - .org 0xfef3 - // XXX - Initial Interrupt Vector Offsets Loaded by POST + // 0xfef3 - InitVectors in misc.c - .org 0xff00 - // XXX - BIOS_COPYRIGHT_STRING - .ascii "(c) 2002 MandrakeSoft S.A. Written by Kevin Lawton & the Bochs team." + // 0xff00 - BiosCopyright in misc.c - .org 0xff53 - .globl dummy_iret_handler -dummy_iret_handler: + ORG 0xff53 + .global entry_iret_official +entry_iret_official: iretw - .org 0xff54 + ORG 0xff54 IRQ_ENTRY_ARG 05 - .org 0xfff0 // Power-up Entry Point - ljmpw $0xf000, $post16 + ORG 0xfff0 // Power-up Entry Point + .global reset_vector +reset_vector: + ljmpw $SEG_BIOS, $entry_post + + // 0xfff5 - BiosDate in misc.c - .org 0xfff5 - // BIOS build date - .ascii "06/23/99" + // 0xfffe - BiosModelId in misc.c - .org 0xfffe - .byte CONFIG_MODEL_ID - .byte 0x00 + // 0xffff - BiosChecksum in misc.c .end