X-Git-Url: http://wien.tomnetworks.com/gitweb/?a=blobdiff_plain;f=src%2Fromlayout.S;h=96aa836c9c5cd326041dd3ba7f2555204f0d02af;hb=07633811954eaaa032dee2fb291ce8c7c042d5e9;hp=a6bad458d7ccf25d938cb0ce89abb308e9fbca12;hpb=952974e3eccaefc667466e8309e15a7fbb867326;p=seabios.git diff --git a/src/romlayout.S b/src/romlayout.S index a6bad45..96aa836 100644 --- a/src/romlayout.S +++ b/src/romlayout.S @@ -3,11 +3,12 @@ // 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" // CONFIG_* #include "ioport.h" // PORT_A20 #include "bregs.h" // CR0_* +#include "cmos.h" // CMOS_RESET_CODE #include "../out/asm-offsets.h" // BREGS_* @@ -16,7 +17,7 @@ ****************************************************************/ .code16gcc -.include "out/blob.16.s" +.include "out/ccode.16.s" /**************************************************************** @@ -111,10 +112,10 @@ cld .endm - // Specify a location in the fixed part of bios area. - .macro ORG addr - .section .text.fixed.addr - .org \addr - BUILD_START_FIXED + // Declare a function + .macro DECLFUNC func + .section .text.asm.\func + .global \func .endm @@ -122,19 +123,50 @@ * POST handler ****************************************************************/ - ORG 0xe05b -post16: + DECLFUNC entry_post +entry_post: // enable cache movl %cr0, %eax andl $~(CR0_CD|CR0_NW), %eax movl %eax, %cr0 - // init the stack pointer - RESET_STACK + // 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 - // Fall through to transition32 function below + // 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, %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 + cld + cli + jmp handle_resume /**************************************************************** @@ -143,6 +175,7 @@ post16: // Place CPU into 32bit mode from 16bit mode. // Clobbers: %eax, flags, stack registers, cr0, idt/gdt + DECLFUNC transition32 transition32: // Disable irqs cli @@ -153,15 +186,15 @@ transition32: 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 // Enable protected mode movl %cr0, %eax orl $CR0_PE, %eax movl %eax, %cr0 - // start protected mode code + // start 32bit protected mode code ljmpl $SEG32_MODE32_CS, $(BUILD_BIOS_ADDR + 1f) .code32 @@ -171,7 +204,6 @@ transition32: movw %ax, %ds movw %ax, %es movw %ax, %ss - xorl %eax, %eax movw %ax, %fs movw %ax, %gs @@ -180,12 +212,13 @@ transition32: // Call a 16bit function from 32bit mode. // %eax = address of struct bregs // Clobbers: all gp registers, flags, stack registers, cr0, idt/gdt - .global __call16_from32 + DECLFUNC __call16_from32 + .global __call16big_from32 __call16_from32: pushl %eax // restore data segment limits to 0xffff - movw $SEG32_MODE16_DS, %ax + movl $SEG32_MODE16_DS, %eax movw %ax, %ds movw %ax, %es movw %ax, %ss @@ -200,6 +233,18 @@ __call16_from32: // Jump to 16bit mode ljmpw $SEG32_MODE16_CS, $1f +__call16big_from32: + pushl %eax + + movl $SEG32_MODE16BIG_DS, %eax + movw %ax, %ds + movw %ax, %es + movw %ax, %ss + movw %ax, %fs + movw %ax, %gs + + ljmpl $SEG32_MODE16BIG_CS, $(BUILD_BIOS_ADDR + 1f) + .code16gcc 1: // Disable protected mode @@ -212,7 +257,7 @@ __call16_from32: 2: // restore IDT to normal real-mode defaults - lidt %cs:rmode_IDT_info + lidtw %cs:rmode_IDT_info // Clear segment registers xorw %ax, %ax @@ -224,22 +269,23 @@ __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 - .global __call16 + DECLFUNC __call16 __call16: // Save eax pushl %eax // Setup for iretw call - pushw $SEG_BIOS + pushw %cs pushw $1f // return point pushw BREGS_flags(%eax) // flags pushl BREGS_ip(%eax) // CS:IP @@ -284,9 +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 - .global apm16protected_entry + DECLFUNC apm16protected_entry apm16protected_entry: pushfw // save flags pushl %eax // dummy @@ -296,7 +371,7 @@ apm16protected_entry: lretw .code32 - .global apm32protected_entry + DECLFUNC apm32protected_entry apm32protected_entry: pushfw pushw %cs // Setup for long jump to 16bit mode @@ -317,7 +392,7 @@ apm32protected_entry: lretl // 32bit elf entry point - .global post32 + DECLFUNC post32 post32: cli cld @@ -328,69 +403,20 @@ post32: .code16gcc -// Shutdown a CPU. We want this in the 0xf000 section to ensure that -// the code wont be overwritten with something else. (Should -// something spurious wake up the CPU, we want to be sure that the hlt -// insn will still be present and will shutdown the CPU.) - .global permanent_halt -permanent_halt: - cli -1: hlt - jmp 1b - - -/**************************************************************** - * GDT and IDT tables - ****************************************************************/ + // IRQ trampolines + .macro IRQ_TRAMPOLINE num + DECLFUNC irq_trampoline_0x\num + irq_trampoline_0x\num : + int $0x\num + lretw + .endm -// Protected mode IDT descriptor -// -// I just make the limit 0, so the machine will shutdown -// if an exception occurs during protected mode memory -// transfers. -// -// Set base to f0000 to correspond to beginning of BIOS, -// in case I actually define an IDT later -// Set limit to 0 -pmode_IDT_info: - .word 0x0000 // limit 15:00 - .long 0xf0000 // base 16:47 - -// Real mode IDT descriptor -// -// Set to typical real-mode values. -// base = 000000 -// limit = 03ff -rmode_IDT_info: - .word 0x03ff // limit 15:00 - .long 0 // base 16:47 - -rombios32_gdt_48: - .word 0x30 - .word rombios32_gdt - .word 0x000f - - .balign 8 -rombios32_gdt: - .word 0, 0, 0, 0 - .word 0, 0, 0, 0 - // 32 bit flat code segment (SEG32_MODE32_CS) - .word 0xffff, 0, 0x9b00, 0x00cf - // 32 bit flat data segment (SEG32_MODE32_DS) - .word 0xffff, 0, 0x9300, 0x00cf - // 16 bit code segment base=0xf0000 limit=0xffff (SEG32_MODE16_CS) - .word 0xffff, 0, 0x9b0f, 0x0000 - // 16 bit data segment base=0x0 limit=0xffff (SEG32_MODE16_DS) - .word 0xffff, 0, 0x9300, 0x0000 - -// We need a copy of this string in the 0xf000 segment, but we are not -// actually a PnP BIOS, so make sure it is *not* aligned, so OSes will -// not see it if they scan. - .global pnp_string - .balign 2 - .byte 0 -pnp_string: - .ascii "$PnP" + IRQ_TRAMPOLINE 10 + IRQ_TRAMPOLINE 13 + IRQ_TRAMPOLINE 15 + IRQ_TRAMPOLINE 16 + IRQ_TRAMPOLINE 18 + IRQ_TRAMPOLINE 19 /**************************************************************** @@ -415,75 +441,78 @@ pnp_string: iretw .endm - ORG 0xe2c3 - IRQ_ENTRY nmi - - IRQ_ENTRY_ARG 13 - IRQ_ENTRY_ARG 12 - IRQ_ENTRY_ARG 11 - IRQ_ENTRY 76 - IRQ_ENTRY 1c - IRQ_ENTRY 70 - - ORG 0xe3fe - jmp entry_13 - - ORG 0xe401 - // XXX - Fixed Disk Parameter Table - - ORG 0xe6f2 - jmp entry_19 - - ORG 0xe6f5 -.include "out/cbt.proc.16.s" - .text - - ORG 0xe729 - // XXX - Baud Rate Generator Table - - ORG 0xe739 - IRQ_ENTRY_ARG 14 + // 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 74 - IRQ_ENTRY 75 + 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 // int 18/19 are special - they reset the stack and do not return. - .global entry_19 + DECLFUNC entry_19 entry_19: RESET_STACK pushl $_code32_handle_19 jmp transition32 - .global entry_18 + DECLFUNC entry_18 entry_18: RESET_STACK pushl $_code32_handle_18 jmp transition32 - // IRQ trampolines - .macro IRQ_TRAMPOLINE num - .global irq_trampoline_0x\num - irq_trampoline_0x\num : - int $0x\num - lretw + +/**************************************************************** + * Fixed position entry points + ****************************************************************/ + + // Specify a location in the fixed part of bios area. + .macro ORG addr + .section .fixedaddr.\addr .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 + ORG 0xe05b +entry_post_official: + jmp entry_post + + ORG 0xe2c3 + IRQ_ENTRY nmi + + ORG 0xe3fe + .global entry_13_official +entry_13_official: + jmp entry_13 + + // 0xe401 - OldFDPT in disk.c + + ORG 0xe6f2 + .global entry_19_official +entry_19_official: + jmp entry_19 + + // 0xe6f5 - BIOS_CONFIG_TABLE in misc.c + + // 0xe729 - BaudTable in serial.c + + ORG 0xe739 + IRQ_ENTRY_ARG 14 ORG 0xe82e IRQ_ENTRY_ARG 16 -entry_hwirq: - ENTRY handle_hwirq - ORG 0xe987 IRQ_ENTRY 09 @@ -493,40 +522,35 @@ entry_hwirq: ORG 0xef57 IRQ_ENTRY 0e - ORG 0xefc7 -.include "out/floppy_dbt.proc.16.s" - .text + // 0xefc7 - diskette_param_table in floppy.c ORG 0xefd2 IRQ_ENTRY_ARG 17 ORG 0xf045 - // XXX int 10 +entry_10_0x0f: + // XXX - INT 10 Functions 0-Fh Entry Point iretw ORG 0xf065 IRQ_ENTRY_ARG 10 - ORG 0xf0a4 - // XXX int 1D - iretw - - .global freespace2_start, freespace2_end -freespace2_start: + // 0xf0a4 - VideoParams in misc.c ORG 0xf841 -freespace2_end: + .global entry_12_official +entry_12_official: jmp entry_12 ORG 0xf84d + .global entry_11_official +entry_11_official: jmp entry_11 ORG 0xf859 IRQ_ENTRY_ARG 15 - ORG 0xfa6e -.include "out/font.proc.16.s" - .text + // 0xfa6e - vgafont8 in font.c ORG 0xfe6e IRQ_ENTRY_ARG 1a @@ -534,33 +558,27 @@ freespace2_end: 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 - .global dummy_iret_handler -dummy_iret_handler: + .global entry_iret_official +entry_iret_official: iretw ORG 0xff54 IRQ_ENTRY_ARG 05 ORG 0xfff0 // Power-up Entry Point - ljmpw $SEG_BIOS, $post16 + .global reset_vector +reset_vector: + ljmpw $SEG_BIOS, $entry_post_official - ORG 0xfff5 - // BIOS build date - .ascii "06/23/99" + // 0xfff5 - BiosDate in misc.c - ORG 0xfffe - .byte CONFIG_MODEL_ID + // 0xfffe - BiosModelId in misc.c - .global bios_checksum -bios_checksum: - .byte 0x00 + // 0xffff - BiosChecksum in misc.c .end