X-Git-Url: http://wien.tomnetworks.com/gitweb/?a=blobdiff_plain;f=src%2Fromlayout.S;h=5983a4a7b1c615e64acba65d30674078a8fedb0e;hb=refs%2Fheads%2Fcoreboot;hp=6d7fdd9faeacd73873f5f0be0900f2c73dd782fc;hpb=75f49b36499aed665c0cd438d12c098447ab21d9;p=seabios.git diff --git a/src/romlayout.S b/src/romlayout.S index 6d7fdd9..5983a4a 100644 --- a/src/romlayout.S +++ b/src/romlayout.S @@ -1,188 +1,45 @@ // 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 LGPLv3 license. -#include "config.h" // CONFIG_* -#include "ioport.h" // PORT_A20 -#include "bregs.h" // CR0_* -#include "cmos.h" // CMOS_RESET_CODE -#include "../out/asm-offsets.h" // BREGS_* - /**************************************************************** * Include of 16bit C code ****************************************************************/ .code16gcc -.include "out/ccode.16.s" - - -/**************************************************************** - * 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 - cli // In case something far-calls instead of using "int" - cld - pushl %eax // Save registers clobbered by C code - pushl %ecx - pushl %edx - pushw %es - pushw %ds - movw %ss, %ax // Move %ss to %ds - movw %ax, %ds - pushl %esp // Backup %esp, then clear high bits - movzwl %sp, %esp - calll \cfunc - popl %esp // Restore %esp (including high bits) - popw %ds // Restore registers saved above - 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 - cli - cld - pushl %eax // Save registers (matches struct bregs) - pushl %ecx - pushl %edx - pushl %ebx - pushl %esi - pushl %edi - pushw %es - pushw %ds - 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 - calll \cfunc - movl %ebx, %esp // Restore %esp (including high bits) - popw %ds // Restore registers (from struct bregs) - popw %es - popl %edi - popl %esi - popl %ebx - popl %edx - popl %ecx - popl %eax - .endm - - // As above, but don't mangle %esp - .macro ENTRY_ARG_ESP cfunc - cli - cld - pushl %eax // Save registers (matches struct bregs) - pushl %ecx - pushl %edx - pushl %ebx - pushl %esi - pushl %edi - pushw %es - pushw %ds - movw %ss, %ax // Move %ss to %ds - movw %ax, %ds - movl %esp, %eax // First arg is pointer to struct bregs - calll \cfunc - popw %ds // Restore registers (from struct bregs) - popw %es - popl %edi - popl %esi - popl %ebx - popl %edx - popl %ecx - popl %eax - .endm +#include "ccode.16.s" - // Reset stack, transition to 32bit mode, and call a C function. - // Clobbers %ax - .macro ENTRY_INTO32 cfunc - xorw %ax, %ax - movw %ax, %ss - movl $ BUILD_STACK_ADDR , %esp - pushl $ \cfunc - jmp transition32 - .endm - - // Declare a function - .macro DECLFUNC func - .section .text.asm.\func - .global \func - .endm +#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_* /**************************************************************** - * POST handler + * Call trampolines ****************************************************************/ - DECLFUNC entry_post -entry_post: - // Enable cache - movl %cr0, %eax - andl $~(CR0_CD|CR0_NW), %eax - movl %eax, %cr0 +// Place CPU into 32bit mode from 16bit mode. +// %edx = return location (in 32bit mode) +// Clobbers: ecx, flags, segment registers, cr0, idt/gdt + DECLFUNC transition32 +transition32: + movl %eax, %ecx - // Disable interrupts + // Disable irqs (and clear direction flag) cli cld - // Check for restart indicator. + // Disable nmi movl $CMOS_RESET_CODE|NMI_DISABLE_BIT, %eax outb %al, $PORT_CMOS_INDEX inb $PORT_CMOS_DATA, %al - cmpb $0x0, %al - jnz 1f - - // Normal entry point - ENTRY_INTO32 _code32__start - - // Entry point when a post call looks like a resume. -1: - // Save old shutdown status. - movl %eax, %ebx - - // Clear shutdown status register. - movl $CMOS_RESET_CODE|NMI_DISABLE_BIT, %eax - outb %al, $PORT_CMOS_INDEX - xorl %eax, %eax - outb %al, $PORT_CMOS_DATA - - // Use a stack in EBDA - movw $SEG_BDA, %ax - movw %ax, %ds - movw BDA_ebda_seg, %ax - // XXX - should verify ebda_seg looks sane. - movw %ax, %ds - movw %ax, %ss - movl $EBDA_OFFSET_TOP_STACK, %esp - - // Call handler. - movl %ebx, %eax - jmp handle_resume - - -/**************************************************************** - * Call trampolines - ****************************************************************/ - -// Place CPU into 32bit mode from 16bit mode. -// Clobbers: flags, segment registers, cr0, idt/gdt -// Require: interrupts must be disabled - DECLFUNC transition32 -transition32: - pushl %eax // enable a20 inb $PORT_A20, %al @@ -193,11 +50,6 @@ transition32: lidtw %cs:pmode_IDT_info lgdtw %cs:rombios32_gdt_48 - // Disable nmi - movl $CMOS_RESET_CODE|NMI_DISABLE_BIT, %eax - outb %al, $PORT_CMOS_INDEX - inb $PORT_CMOS_DATA, %al - // Enable protected mode movl %cr0, %eax orl $CR0_PE, %eax @@ -216,16 +68,16 @@ transition32: movw %ax, %fs movw %ax, %gs - popl %eax - retl + movl %ecx, %eax + jmpl *%edx -// 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 -__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 @@ -235,16 +87,18 @@ __call16_from32: 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 ljmpw $SEG32_MODE16_CS, $1f -__call16big_from32: - pushl %eax +transition16big: + movl %eax, %ecx movl $SEG32_MODE16BIG_DS, %eax movw %ax, %ds @@ -253,7 +107,7 @@ __call16big_from32: movw %ax, %fs movw %ax, %gs - ljmpl $SEG32_MODE16BIG_CS, $(BUILD_BIOS_ADDR + 1f) + ljmpw $SEG32_MODE16BIG_CS, $1f .code16gcc 1: @@ -277,14 +131,8 @@ __call16big_from32: movw %ax, %ds movw %ax, %ss // Assume stack is in segment 0 - popl %eax - - // Make call. - calll __call16 - - // Return via transition32 - jmp transition32 - + movl %ecx, %eax + jmpl *%edx // Call a 16bit function from 16bit mode with a specified cpu register state // %eax = address of struct bregs @@ -299,11 +147,12 @@ __call16: pushw %cs pushw $1f // return point pushw BREGS_flags(%eax) // flags - pushl BREGS_ip(%eax) // CS:IP + pushl BREGS_code(%eax) // CS:IP // Load calling registers. 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 @@ -331,6 +180,7 @@ __call16: 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) @@ -338,12 +188,99 @@ __call16: 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 - retl +// 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 -// PnP trampolines +// PnP entry points DECLFUNC entry_pnp_real .global entry_pnp_prot entry_pnp_prot: @@ -354,6 +291,8 @@ entry_pnp_real: movzwl %sp, %esp 1: pushfl // Save registers clobbered by C code + cli + cld pushl %eax pushl %ecx pushl %edx @@ -361,7 +300,7 @@ entry_pnp_real: pushw %ds movw %ss, %cx // Move %ss to %ds movw %cx, %ds - lea 28(%esp), %eax // %eax points to start of u16 args + 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 @@ -373,98 +312,124 @@ entry_pnp_real: popl %esp lretw -// APM trampolines - DECLFUNC 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 - DECLFUNC apm32protected_entry -apm32protected_entry: - pushfw - pushw %cs // Setup for long jump to 16bit mode - pushw $1f - addw $8, 2(%esp) - ljmpw *(%esp) - .code16gcc -1: - ENTRY_ARG_ESP handle_1553 + 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 - movw $2f,(%esp) // Setup for long jump back to 32bit mode - subw $8, 2(%esp) - ljmpw *(%esp) - .code32 -2: - addl $4, %esp // pop call address - popfw +// 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 + +// 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 // 32bit elf entry point - DECLFUNC post32 -post32: + 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, $_code32__start + ljmpl $SEG32_MODE32_CS, $_cfunc32flat_handle_post .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 - /**************************************************************** * 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 .global entry_\num entry_\num : - 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 .global entry_\num entry_\num : - ENTRY_ARG handle_\num - iretw + pushl $ handle_\num + jmp irqentryarg .endm - // Macros that put each handler into its own section - .macro DECL_IRQ_ENTRY num - .section .text.asm.entry_\num - IRQ_ENTRY \num - .endm .macro DECL_IRQ_ENTRY_ARG num - .section .text.asm.entry_\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_ARG 12 - DECL_IRQ_ENTRY_ARG 11 DECL_IRQ_ENTRY 76 DECL_IRQ_ENTRY 70 DECL_IRQ_ENTRY 74 @@ -475,15 +440,11 @@ post32: // int 18/19 are special - they reset stack and call into 32bit mode. DECLFUNC entry_19 entry_19: - cli - cld - ENTRY_INTO32 _code32_handle_19 + ENTRY_INTO32 _cfunc32flat_handle_19 DECLFUNC entry_18 entry_18: - cli - cld - ENTRY_INTO32 _code32_handle_18 + ENTRY_INTO32 _cfunc32flat_handle_18 /**************************************************************** @@ -496,8 +457,10 @@ entry_18: .endm ORG 0xe05b -entry_post_official: - jmp entry_post +entry_post: + cmpl $0, %cs:HaveRunPost // Check for resume/reboot + jnz entry_resume + ENTRY_INTO32 _cfunc32flat_handle_post // Normal entry point ORG 0xe2c3 IRQ_ENTRY 02 @@ -549,14 +512,10 @@ entry_10_0x0f: // 0xf0a4 - VideoParams in misc.c ORG 0xf841 - .global entry_12_official -entry_12_official: - jmp entry_12 + IRQ_ENTRY_ARG 12 ORG 0xf84d - .global entry_11_official -entry_11_official: - jmp entry_11 + IRQ_ENTRY_ARG 11 ORG 0xf859 IRQ_ENTRY_ARG 15 @@ -584,7 +543,7 @@ entry_iret_official: ORG 0xfff0 // Power-up Entry Point .global reset_vector reset_vector: - ljmpw $SEG_BIOS, $entry_post_official + ljmpw $SEG_BIOS, $entry_post // 0xfff5 - BiosDate in misc.c