// Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
// 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_*
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
* 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
+
+ // 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
- // Fall through to transition32 function below
+ // Call handler.
+ movl %ebx, %eax
+ cld
+ cli
+ jmp handle_resume
/****************************************************************
// Place CPU into 32bit mode from 16bit mode.
// Clobbers: %eax, flags, stack registers, cr0, idt/gdt
+ DECLFUNC transition32
transition32:
// Disable irqs
cli
// 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, __call16big_from32
+ DECLFUNC __call16_from32
+ .global __call16big_from32
__call16_from32:
pushl %eax
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
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
lretw
.code32
- .global apm32protected_entry
+ DECLFUNC apm32protected_entry
apm32protected_entry:
pushfw
pushw %cs // Setup for long jump to 16bit mode
lretl
// 32bit elf entry point
- .global post32
+ DECLFUNC post32
post32:
cli
cld
.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 $0x\num
+ lretw
+ .endm
-// Protected mode IDT descriptor
-//
-// I just make the limit 0, so the machine will shutdown
-// if an exception occurs during protected mode memory
-// transfers.
-//
-// Set base to f0000 to correspond to beginning of BIOS,
-// in case I actually define an IDT later
-// Set limit to 0
-pmode_IDT_info:
- .word 0x0000 // limit 15:00
- .long 0xf0000 // base 16:47
-
-// Real mode IDT descriptor
-//
-// Set to typical real-mode values.
-// base = 000000
-// limit = 03ff
-rmode_IDT_info:
- .word 0x03ff // limit 15:00
- .long 0 // base 16:47
-
-rombios32_gdt_48:
- .word (rombios32_gdt_end - rombios32_gdt)
- .long (BUILD_BIOS_ADDR + rombios32_gdt)
-
- .balign 8
-rombios32_gdt:
- .word 0, 0, 0, 0
- .word 0, 0, 0, 0
- // 32 bit flat code segment (SEG32_MODE32_CS)
- .word 0xffff, 0, 0x9b00, 0x00cf
- // 32 bit flat data segment (SEG32_MODE32_DS)
- .word 0xffff, 0, 0x9300, 0x00cf
- // 16 bit code segment base=0xf0000 limit=0xffff (SEG32_MODE16_CS)
- .word 0xffff, 0, 0x9b0f, 0x0000
- // 16 bit data segment base=0x0 limit=0xffff (SEG32_MODE16_DS)
- .word 0xffff, 0, 0x9300, 0x0000
- // 16 bit code segment base=0 limit=0xffffffff (SEG32_MODE16BIG_CS)
- .word 0xffff, 0, 0x9b00, 0x008f
- // 16 bit data segment base=0 limit=0xffffffff (SEG32_MODE16BIG_DS)
- .word 0xffff, 0, 0x9300, 0x008f
-rombios32_gdt_end:
-
-// We need a copy of this string in the 0xf000 segment, but we are not
-// actually a PnP BIOS, so make sure it is *not* aligned, so OSes will
-// not see it if they scan.
- .global pnp_string
- .balign 2
- .byte 0
-pnp_string:
- .ascii "$PnP"
+ IRQ_TRAMPOLINE 10
+ IRQ_TRAMPOLINE 13
+ IRQ_TRAMPOLINE 15
+ IRQ_TRAMPOLINE 16
+ IRQ_TRAMPOLINE 18
+ IRQ_TRAMPOLINE 19
/****************************************************************
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
- .global entry_hwirq
-entry_hwirq:
- ENTRY handle_hwirq
-
ORG 0xe987
IRQ_ENTRY 09
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
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
ORG 0xfff0 // Power-up Entry Point
.global reset_vector
reset_vector:
- ljmpw $SEG_BIOS, $post16
+ 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
projects / seabios.git / blobdiff