X-Git-Url: http://wien.tomnetworks.com/gitweb/?a=blobdiff_plain;f=src%2Fromlayout.S;h=5983a4a7b1c615e64acba65d30674078a8fedb0e;hb=b93739776593eb470bd18ce8f8b028054cee0e3d;hp=e9ea067052f50c5d99c3b8e47cd02217e6a6ca50;hpb=1492708bbf9d44f2b0435b0ee5d9d037deeb9961;p=seabios.git diff --git a/src/romlayout.S b/src/romlayout.S index e9ea067..5983a4a 100644 --- a/src/romlayout.S +++ b/src/romlayout.S @@ -1,11 +1,9 @@ // 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" +// This file may be distributed under the terms of the GNU LGPLv3 license. /**************************************************************** @@ -13,125 +11,14 @@ ****************************************************************/ .code16gcc -.include "out/blob.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 - 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 - 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 +#include "ccode.16.s" - // 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 $ BUILD_STACK_ADDR , %esp - cld - .endm - - // Specify a location in the fixed part of bios area. - .macro ORG addr - .section .text.fixed.addr - .org \addr - BUILD_START_FIXED - .endm - - -/**************************************************************** - * POST handler - ****************************************************************/ - - ORG 0xe05b -post16: - // enable cache - movl %cr0, %eax - andl $0x9fffffff, %eax - movl %eax, %cr0 - - // init the stack pointer - RESET_STACK - - pushl $_code32__start - - // 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_* /**************************************************************** @@ -139,26 +26,36 @@ post16: ****************************************************************/ // 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 + // start 32bit protected mode code ljmpl $SEG32_MODE32_CS, $(BUILD_BIOS_ADDR + 1f) .code32 @@ -168,35 +65,55 @@ transition32: 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 - .global __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 ljmpw $SEG32_MODE16_CS, $1f - .code16gcc -1: - // restore data segment limits to 0xffff - movw $SEG32_MODE16_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 @@ -204,7 +121,7 @@ __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 @@ -214,36 +131,34 @@ __call16_from32: movw %ax, %ds movw %ax, %ss // Assume stack is in segment 0 - popl %eax - - // Set __call16 return address to be transition32 - 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 - .global __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 $SEG_BIOS + 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 @@ -252,228 +167,326 @@ __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 - 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 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 - .global 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 - .global 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 - .global 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, $_cfunc32flat_handle_post .code16gcc -// Shutdown a CPU. We want this in the 0xf000 section to ensure that -// the code wont be overwritten with something else. (Should -// something spurious wake up the CPU, we want to be sure that the hlt -// insn will still be present and will shutdown the CPU.) - .global permanent_halt -permanent_halt: - cli -1: hlt - jmp 1b - /**************************************************************** - * GDT and IDT tables + * Interrupt entry points ****************************************************************/ -// Protected mode IDT descriptor -// -// I just make the limit 0, so the machine will shutdown -// if an exception occurs during protected mode memory -// transfers. -// -// Set base to f0000 to correspond to beginning of BIOS, -// in case I actually define an IDT later -// Set limit to 0 -pmode_IDT_info: - .word 0x0000 // limit 15:00 - .long 0xf0000 // base 16:47 - -// Real mode IDT descriptor -// -// Set to typical real-mode values. -// base = 000000 -// limit = 03ff -rmode_IDT_info: - .word 0x03ff // limit 15:00 - .long 0 // base 16:47 - -rombios32_gdt_48: - .word 0x30 - .word rombios32_gdt - .word 0x000f - - .balign 8 -rombios32_gdt: - .word 0, 0, 0, 0 - .word 0, 0, 0, 0 - // 32 bit flat code segment (SEG32_MODE32_CS) - .word 0xffff, 0, 0x9b00, 0x00cf - // 32 bit flat data segment (SEG32_MODE32_DS) - .word 0xffff, 0, 0x9300, 0x00cf - // 16 bit code segment base=0xf0000 limit=0xffff (SEG32_MODE16_CS) - .word 0xffff, 0, 0x9b0f, 0x0000 - // 16 bit data segment base=0x0 limit=0xffff (SEG32_MODE16_DS) - .word 0xffff, 0, 0x9300, 0x0000 - -// We need a copy of this string in the 0xf000 segment, but we are not -// actually a PnP BIOS, so make sure it is *not* aligned, so OSes will -// not see it if they scan. - .global pnp_string - .balign 2 - .byte 0 -pnp_string: - .ascii "$PnP" - + // Main entry point for interrupts without args + DECLFUNC irqentry +irqentry: + ENTRY_ST + iretw -/**************************************************************** - * Interrupt entry points - ****************************************************************/ + // 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 : - 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 .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 + // 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 + IRQ_ENTRY 02 ORG 0xe3fe + .global entry_13_official +entry_13_official: jmp entry_13 - ORG 0xe401 - // XXX - Fixed Disk Parameter Table + // 0xe401 - OldFDPT in disk.c ORG 0xe6f2 + .global entry_19_official +entry_19_official: jmp entry_19 - ORG 0xe6f5 -.include "out/cbt.proc.16.s" - .text + // 0xe6f5 - BIOS_CONFIG_TABLE in misc.c - ORG 0xe729 - // XXX - Baud Rate Generator Table + // 0xe729 - BaudTable in serial.c ORG 0xe739 IRQ_ENTRY_ARG 14 - IRQ_ENTRY 74 - IRQ_ENTRY 75 - - // int 18/19 are special - they reset the stack and do not return. - .global entry_19 -entry_19: - RESET_STACK - pushl $_code32_handle_19 - jmp transition32 - - .global 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 - .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 0xe82e IRQ_ENTRY_ARG 16 -entry_hwirq: - ENTRY handle_hwirq - ORG 0xe987 IRQ_ENTRY 09 @@ -483,40 +496,31 @@ 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: - jmp entry_12 + IRQ_ENTRY_ARG 12 ORG 0xf84d - jmp entry_11 + IRQ_ENTRY_ARG 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 @@ -524,33 +528,27 @@ 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 - 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