X-Git-Url: http://wien.tomnetworks.com/gitweb/?a=blobdiff_plain;f=src%2Fromlayout.S;h=96aa836c9c5cd326041dd3ba7f2555204f0d02af;hb=07633811954eaaa032dee2fb291ce8c7c042d5e9;hp=baf68f354cdbea4ca210161e901e0b95e9790e81;hpb=e0113c99c083d9b812216e120aff9eb9806de91b;p=seabios.git diff --git a/src/romlayout.S b/src/romlayout.S index baf68f3..96aa836 100644 --- a/src/romlayout.S +++ b/src/romlayout.S @@ -3,27 +3,21 @@ // Copyright (C) 2008 Kevin O'Connor // Copyright (C) 2002 MandrakeSoft S.A. // -// This file may be distributed under the terms of the GNU GPLv3 license. +// This file may be distributed under the terms of the GNU LGPLv3 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 +#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 ****************************************************************/ - .globl bios16c_start, bios16c_end -bios16c_start: -.include "out/blob.proc.16.s" - .text -bios16c_end: + .code16gcc +.include "out/ccode.16.s" /**************************************************************** @@ -84,12 +78,44 @@ bios16c_end: popl %eax .endm + // As above, but don't mangle %esp + .macro ENTRY_ARG_ESP cfunc + 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 + // Macro to reset the 16bit stack // Clobbers %ax .macro RESET_STACK xorw %ax, %ax movw %ax, %ss - movl $ CONFIG_STACK_OFFSET , %esp + movl $ BUILD_STACK_ADDR , %esp + cld + .endm + + // Declare a function + .macro DECLFUNC func + .section .text.asm.\func + .global \func .endm @@ -97,21 +123,50 @@ bios16c_end: * POST handler ****************************************************************/ - .org 0xe05b - .globl post16 -post16: - // init the stack pointer + DECLFUNC entry_post +entry_post: + // enable cache + movl %cr0, %eax + andl $~(CR0_CD|CR0_NW), %eax + movl %eax, %cr0 + + // Check for restart indicator. + movl $CMOS_RESET_CODE, %eax + outb %al, $PORT_CMOS_INDEX + inb $PORT_CMOS_DATA, %al + cmpb $0x0, %al + jnz 1f + + // Normal entry point RESET_STACK + pushl $_code32__start + jmp transition32 - // Set entry point of rombios32 code - the actual address - // is altered later in the build process. - .globl set_entry32 -set_entry32: - pushl $0xf0000000 + // Entry point when a post call looks like a resume. +1: + // Save old shutdown status. + movl %eax, %ebx - cld + // Clear shutdown status register. + movl $CMOS_RESET_CODE, %eax + outb %al, $PORT_CMOS_INDEX + xorl %eax, %eax + outb %al, $PORT_CMOS_DATA - // Fall through to transition32 function below + // 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 + cld + cli + jmp handle_resume /**************************************************************** @@ -120,36 +175,35 @@ set_entry32: // Place CPU into 32bit mode from 16bit mode. // Clobbers: %eax, flags, stack registers, cr0, idt/gdt + DECLFUNC transition32 transition32: // Disable irqs cli // 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 @@ -158,34 +212,52 @@ transition32: // 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 + DECLFUNC __call16_from32 + .global __call16big_from32 __call16_from32: pushl %eax + // 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 + + // disable a20 + inb $PORT_A20, %al + andb $~A20_ENABLE_BIT, %al + outb %al, $PORT_A20 + // Jump to 16bit mode - ljmpw $REAL_MODE_CS, $1f + ljmpw $SEG32_MODE16_CS, $1f - .code16gcc -1: - // restore data segment limits to 0xffff - movw $REAL_MODE_DS, %ax +__call16big_from32: + pushl %eax + + 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 + ljmpl $SEG32_MODE16BIG_CS, $(BUILD_BIOS_ADDR + 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 @@ -197,34 +269,36 @@ __call16_from32: popl %eax - // Set __call16 return address to be transition32 - pushl $transition32 + // Make call. + calll __call16 - // Fall through to __call16 + // Return via transition32 + jmp transition32 // 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 + DECLFUNC __call16 __call16: // Save eax 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_ip(%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_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 @@ -233,20 +307,21 @@ __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) + movw %es, BREGS_es(%eax) + movl %edi, BREGS_edi(%eax) + movl %esi, BREGS_esi(%eax) + movl %ebx, BREGS_ebx(%eax) + movl %edx, BREGS_edx(%eax) // Remove %eax popl %eax @@ -255,9 +330,38 @@ __call16: retl +// PnP trampolines + 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 + pushl %eax + pushl %ecx + pushl %edx + pushw %es + pushw %ds + movw %ss, %cx // Move %ss to %ds + movw %cx, %ds + lea 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 + DECLFUNC apm16protected_entry apm16protected_entry: pushfw // save flags pushl %eax // dummy @@ -267,71 +371,52 @@ apm16protected_entry: lretw .code32 - .globl apm32protected_entry + DECLFUNC apm32protected_entry apm32protected_entry: pushfw pushw %cs // Setup for long jump to 16bit mode pushw $1f - incw 2(%esp) + addw $8, 2(%esp) ljmpw *(%esp) .code16gcc 1: - ENTRY_ARG handle_1553 + ENTRY_ARG_ESP handle_1553 movw $2f,(%esp) // Setup for long jump back to 32bit mode - decw 2(%esp) + subw $8, 2(%esp) ljmpw *(%esp) .code32 2: addl $4, %esp // pop call address popfw lretl - .code16gcc +// 32bit elf entry point + DECLFUNC post32 +post32: + cli + cld + lidtl (BUILD_BIOS_ADDR + pmode_IDT_info) + lgdtl (BUILD_BIOS_ADDR + rombios32_gdt_48) + movl $BUILD_STACK_ADDR, %esp + ljmpl $SEG32_MODE32_CS, $_code32__start -/**************************************************************** - * GDT and IDT tables - ****************************************************************/ + .code16gcc -// 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 + // 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 /**************************************************************** @@ -340,7 +425,7 @@ rombios32_gdt: // 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 @@ -349,151 +434,151 @@ rombios32_gdt: // 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 .endm - .org 0xe2c3 - IRQ_ENTRY nmi + // 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 + 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 + 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 + DECL_IRQ_ENTRY 75 + DECL_IRQ_ENTRY hwpic1 + DECL_IRQ_ENTRY hwpic2 - .org 0xe3fe - jmp entry_13 + // int 18/19 are special - they reset the stack and do not return. + DECLFUNC entry_19 +entry_19: + RESET_STACK + pushl $_code32_handle_19 + jmp transition32 - .org 0xe401 - // XXX - Fixed Disk Parameter Table + DECLFUNC entry_18 +entry_18: + RESET_STACK + pushl $_code32_handle_18 + jmp transition32 - .org 0xe6f2 - jmp entry_19 - .org 0xe6f5 -.include "out/cbt.proc.16.s" - .text +/**************************************************************** + * Fixed position entry points + ****************************************************************/ - .org 0xe729 - // XXX - Baud Rate Generator Table + // Specify a location in the fixed part of bios area. + .macro ORG addr + .section .fixedaddr.\addr + .endm - .org 0xe739 - IRQ_ENTRY_ARG 14 + ORG 0xe05b +entry_post_official: + jmp entry_post - IRQ_ENTRY 74 - IRQ_ENTRY 75 + ORG 0xe2c3 + IRQ_ENTRY nmi - // int 18/19 are special - they reset the stack and do not return. - .globl entry_19 -entry_19: - RESET_STACK - ENTRY handle_19 + ORG 0xe3fe + .global entry_13_official +entry_13_official: + jmp entry_13 - .globl entry_18 -entry_18: - RESET_STACK - ENTRY handle_18 + // 0xe401 - OldFDPT in disk.c - // IRQ trampolines - .macro IRQ_TRAMPOLINE num - .globl irq_trampoline_0x\num - irq_trampoline_0x\num : - int $0x\num - lretw - .endm + ORG 0xe6f2 + .global entry_19_official +entry_19_official: + jmp entry_19 - 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 + // 0xe6f5 - BIOS_CONFIG_TABLE in misc.c + + // 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: + ORG 0xf841 + .global entry_12_official +entry_12_official: jmp entry_12 - .org 0xf84d + ORG 0xf84d + .global entry_11_official +entry_11_official: jmp entry_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_official + + // 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