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seabios
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Move variables from assembler to C code. 

Define macro VAR16FIXED for declaring a variable at a fixed location.
Introduce new file src/misc.c, and move non int15 calls from system.c
    to it.
Implement all fixed location variables in C code.
Move IDT/GDT defs to misc.c.  Remove unused gdt entry 1.
This commit is contained in:
Kevin O'Connor 2009-01-17 18:49:20 -05:00
parent 095e89bc0b
commit 308537650f
16 changed files with 253 additions and 268 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
Makefile
View File

@ -8,13 +8,12 @@
OUT=out/
# Source files
SRCBOTH=output.c util.c floppy.c ata.c system.c mouse.c kbd.c pci.c \
SRCBOTH=output.c util.c floppy.c ata.c misc.c mouse.c kbd.c pci.c \
serial.c clock.c pic.c cdrom.c ps2port.c smpdetect.c resume.c \
pnpbios.c pirtable.c
SRC16=$(SRCBOTH) disk.c apm.c pcibios.c vgahooks.c
SRC16=$(SRCBOTH) system.c disk.c apm.c pcibios.c vgahooks.c font.c
SRC32=$(SRCBOTH) post.c shadow.c post_menu.c memmap.c coreboot.c boot.c \
acpi.c smm.c mptable.c smbios.c pciinit.c optionroms.c mtrr.c
TABLESRC=font.c cbt.c floppy_dbt.c
cc-option = $(shell if test -z "`$(1) $(2) -S -o /dev/null -xc \
/dev/null 2>&1`"; then echo "$(2)"; else echo "$(3)"; fi ;)
@ -34,8 +33,7 @@ CFLAGS16INC = $(COMMONCFLAGS) -DMODE16=1 -fno-jump-tables -fno-defer-pop \
CFLAGS16INC += -ffunction-sections -fdata-sections
CFLAGS16 = $(CFLAGS16INC) -g
TABLETMP=$(addprefix $(OUT), $(patsubst %.c,%.16.s,$(TABLESRC)))
all: $(OUT) $(OUT)bios.bin $(TABLETMP)
all: $(OUT) $(OUT)bios.bin
# Run with "make V=1" to see the actual compile commands
ifdef V
@ -60,15 +58,12 @@ vpath %.S src
# involves including all the content textually via #include
# directives. The second method uses gcc's "-combine" option.
ifdef AVOIDCOMBINE
DEPHACK=
define whole-compile
@echo " Compiling whole program $3"
$(Q)printf '$(foreach i,$2,#include "../$i"\n)' > $3.tmp.c
$(Q)$(CC) $1 -c $3.tmp.c -o $3
endef
else
# Ugly way to get gcc to generate .d files correctly.
DEPHACK=-combine src/null.c
define whole-compile
@echo " Compiling whole program $3"
$(Q)$(CC) $1 -combine -c $2 -o $3
@ -76,26 +71,21 @@ endef
endif
$(OUT)%.proc.16.s: $(OUT)%.16.s
@echo " Moving data sections to text in $@"
$(Q)sed 's/^\t\.section\t\.\(ro\)\?data.*// ; s/^\t\.data$$//' < $< > $@
$(OUT)%.16.s: %.c
$(OUT)%.s: %.c
@echo " Compiling to assembler $@"
$(Q)$(CC) $(CFLAGS16INC) $(DEPHACK) -S -c $< -o $@
$(Q)$(CC) $(CFLAGS16INC) -S -c $< -o $@
$(OUT)%.lds: %.lds.S
@echo " Precompiling $@"
$(Q)$(CPP) -P -D__ASSEMBLY__ $< -o $@
$(OUT)asm-offsets.h: $(OUT)asm-offsets.16.s
$(OUT)asm-offsets.h: $(OUT)asm-offsets.s
@echo " Generating offset file $@"
$(Q)./tools/gen-offsets.sh $< $@
$(OUT)ccode.16.s: ; $(call whole-compile, $(CFLAGS16) -S, $(addprefix src/, $(SRC16)),$@)
TABLEASM=$(addprefix $(OUT), $(patsubst %.c,%.proc.16.s,$(TABLESRC)))
$(OUT)romlayout16.o: romlayout.S $(OUT)ccode.16.s $(OUT)asm-offsets.h $(TABLEASM)
$(OUT)romlayout16.o: romlayout.S $(OUT)ccode.16.s $(OUT)asm-offsets.h
@echo " Compiling (16bit) $@"
$(Q)$(CC) $(CFLAGS16INC) -c -D__ASSEMBLY__ $< -o $@

8
src/biosvar.h
View File

@ -15,18 +15,18 @@
* Interupt vector table
****************************************************************/
struct ivec {
struct rmode_IVT {
union {
struct {
u16 offset;
u16 seg;
};
u32 segoff;
};
} ivec[256];
};
#define SET_IVT(vector, seg, off) \
SET_FARVAR(SEG_IVT, ((struct ivec *)0)[vector].segoff, ((seg) << 16) | (off))
SET_FARVAR(SEG_IVT, ((struct rmode_IVT *)0)->ivec[vector].segoff, ((seg) << 16) | (off))
/****************************************************************
@ -284,6 +284,6 @@ struct bios_config_table_s {
u8 feature1, feature2, feature3, feature4, feature5;
} PACKED;
extern struct bios_config_table_s BIOS_CONFIG_TABLE;
extern struct bios_config_table_s BIOS_CONFIG_TABLE __aligned(1);
#endif // __BIOSVAR_H

42
src/cbt.c
View File

@ -1,42 +0,0 @@
// BIOS configuration table.
//
// 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 LGPLv3 license.
#include "biosvar.h" // CONFIG_BIOS_TABLE
// DMA channel 3 used by hard disk BIOS
#define CBT_F1_DMA3USED (1<<7)
// 2nd interrupt controller (8259) installed
#define CBT_F1_2NDPIC (1<<6)
// Real-Time Clock installed
#define CBT_F1_RTC (1<<5)
// INT 15/AH=4Fh called upon INT 09h
#define CBT_F1_INT154F (1<<4)
// wait for external event (INT 15/AH=41h) supported
#define CBT_F1_WAITEXT (1<<3)
// extended BIOS area allocated (usually at top of RAM)
#define CBT_F1_EBDA (1<<2)
// bus is Micro Channel instead of ISA
#define CBT_F1_MCA (1<<1)
// system has dual bus (Micro Channel + ISA)
#define CBT_F1_MCAISA (1<<0)
// INT 16/AH=09h (keyboard functionality) supported
#define CBT_F2_INT1609 (1<<6)
struct bios_config_table_s BIOS_CONFIG_TABLE __aligned(1) VAR16 = {
.size = sizeof(BIOS_CONFIG_TABLE) - 2,
.model = CONFIG_MODEL_ID,
.submodel = CONFIG_SUBMODEL_ID,
.biosrev = CONFIG_BIOS_REVISION,
.feature1 = (
CBT_F1_2NDPIC | CBT_F1_RTC | CBT_F1_EBDA
| (CONFIG_KBD_CALL_INT15_4F ? CBT_F1_INT154F : 0)),
.feature2 = CBT_F2_INT1609,
.feature3 = 0,
.feature4 = 0,
.feature5 = 0,
};

12
src/config.h
View File

@ -111,12 +111,12 @@
#define SEG_BIOS 0xf000
// Segment definitions in protected mode (see rombios32_gdt in romlayout.S)
#define SEG32_MODE32_CS (2 << 3)
#define SEG32_MODE32_DS (3 << 3)
#define SEG32_MODE16_CS (4 << 3)
#define SEG32_MODE16_DS (5 << 3)
#define SEG32_MODE16BIG_CS (6 << 3)
#define SEG32_MODE16BIG_DS (7 << 3)
#define SEG32_MODE32_CS (1 << 3)
#define SEG32_MODE32_DS (2 << 3)
#define SEG32_MODE16_CS (3 << 3)
#define SEG32_MODE16_DS (4 << 3)
#define SEG32_MODE16BIG_CS (5 << 3)
#define SEG32_MODE16BIG_DS (6 << 3)
// Debugging levels. If non-zero and CONFIG_DEBUG_LEVEL is greater
// than the specified value, then the corresponding irq handler will

3
src/disk.c
View File

@ -712,3 +712,6 @@ handle_76()
SET_BDA(disk_interrupt_flag, 0xff);
eoi_pic2();
}
// Old Fixed Disk Parameter Table (newer tables are in the ebda).
struct fdpt_s OldFDPT VAR16FIXED(0xe401);

17
src/floppy.c
View File

@ -39,6 +39,23 @@ struct floppy_ext_dbt_s diskette_param_table2 VAR16_32 = {
.drive_type = 4, // drive type in cmos
};
// Since no provisions are made for multiple drive types, most
// values in this table are ignored. I set parameters for 1.44M
// floppy here
struct floppy_dbt_s diskette_param_table VAR16FIXED(0xefc7) = {
.specify1 = 0xAF,
.specify2 = 0x02, // head load time 0000001, DMA used
.shutoff_ticks = 0x25,
.bps_code = 0x02,
.sectors = 18,
.interblock_len = 0x1B,
.data_len = 0xFF,
.gap_len = 0x6C,
.fill_byte = 0xF6,
.settle_time = 0x0F,
.startup_time = 0x08,
};
void
floppy_drive_setup()
{

24
src/floppy_dbt.c
View File

@ -1,24 +0,0 @@
// Floppy controller parameter table.
//
// Copyright (C) 2002 MandrakeSoft S.A.
//
// This file may be distributed under the terms of the GNU LGPLv3 license.
#include "disk.h" // struct floppy_dbt_s
// Since no provisions are made for multiple drive types, most
// values in this table are ignored. I set parameters for 1.44M
// floppy here
struct floppy_dbt_s diskette_param_table __aligned(1) VAR16 = {
.specify1 = 0xAF,
.specify2 = 0x02, // head load time 0000001, DMA used
.shutoff_ticks = 0x25,
.bps_code = 0x02,
.sectors = 18,
.interblock_len = 0x1B,
.data_len = 0xFF,
.gap_len = 0x6C,
.fill_byte = 0xF6,
.settle_time = 0x0F,
.startup_time = 0x08,
};

2
src/font.c
View File

@ -7,7 +7,7 @@
* found at ftp://ftp.simtel.net/pub/simtelnet/msdos/screen/fntcol16.zip
* This font is public domain
*/
const u8 vgafont8[128*8] __aligned(1) VAR16 = {
u8 vgafont8[128*8] VAR16FIXED(0xfa6e) = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x7e, 0x81, 0xa5, 0x81, 0xbd, 0x99, 0x81, 0x7e,
0x7e, 0xff, 0xdb, 0xff, 0xc3, 0xe7, 0xff, 0x7e,

193
src/misc.c Normal file
View File

@ -0,0 +1,193 @@
// Code for misc 16bit handlers and variables.
//
// 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 LGPLv3 license.
#include "bregs.h" // struct bregs
#include "biosvar.h" // GET_BDA
#include "util.h" // debug_enter
#include "pic.h" // enable_hwirq
// Amount of continuous ram under 4Gig
u32 RamSize VAR16_32;
// Amount of continuous ram >4Gig
u64 RamSizeOver4G;
/****************************************************************
* Misc 16bit ISRs
****************************************************************/
// INT 12h Memory Size Service Entry Point
void VISIBLE16
handle_12(struct bregs *regs)
{
debug_enter(regs, DEBUG_HDL_12);
regs->ax = GET_BDA(mem_size_kb);
}
// INT 11h Equipment List Service Entry Point
void VISIBLE16
handle_11(struct bregs *regs)
{
debug_enter(regs, DEBUG_HDL_11);
regs->ax = GET_BDA(equipment_list_flags);
}
// INT 05h Print Screen Service Entry Point
void VISIBLE16
handle_05(struct bregs *regs)
{
debug_enter(regs, DEBUG_HDL_05);
}
// INT 10h Video Support Service Entry Point
void VISIBLE16
handle_10(struct bregs *regs)
{
debug_enter(regs, DEBUG_HDL_10);
// dont do anything, since the VGA BIOS handles int10h requests
}
void VISIBLE16
handle_nmi()
{
debug_isr(DEBUG_ISR_nmi);
BX_PANIC("NMI Handler called\n");
}
void
mathcp_setup()
{
dprintf(3, "math cp init\n");
// 80x87 coprocessor installed
SETBITS_BDA(equipment_list_flags, 0x02);
enable_hwirq(13, entry_75);
}
// INT 75 - IRQ13 - MATH COPROCESSOR EXCEPTION
void VISIBLE16
handle_75()
{
debug_isr(DEBUG_ISR_75);
// clear irq13
outb(0, PORT_MATH_CLEAR);
// clear interrupt
eoi_pic2();
// legacy nmi call
u32 eax=0, flags;
call16_simpint(0x02, &eax, &flags);
}
/****************************************************************
* BIOS_CONFIG_TABLE
****************************************************************/
// DMA channel 3 used by hard disk BIOS
#define CBT_F1_DMA3USED (1<<7)
// 2nd interrupt controller (8259) installed
#define CBT_F1_2NDPIC (1<<6)
// Real-Time Clock installed
#define CBT_F1_RTC (1<<5)
// INT 15/AH=4Fh called upon INT 09h
#define CBT_F1_INT154F (1<<4)
// wait for external event (INT 15/AH=41h) supported
#define CBT_F1_WAITEXT (1<<3)
// extended BIOS area allocated (usually at top of RAM)
#define CBT_F1_EBDA (1<<2)
// bus is Micro Channel instead of ISA
#define CBT_F1_MCA (1<<1)
// system has dual bus (Micro Channel + ISA)
#define CBT_F1_MCAISA (1<<0)
// INT 16/AH=09h (keyboard functionality) supported
#define CBT_F2_INT1609 (1<<6)
struct bios_config_table_s BIOS_CONFIG_TABLE VAR16FIXED(0xe6f5) = {
.size = sizeof(BIOS_CONFIG_TABLE) - 2,
.model = CONFIG_MODEL_ID,
.submodel = CONFIG_SUBMODEL_ID,
.biosrev = CONFIG_BIOS_REVISION,
.feature1 = (
CBT_F1_2NDPIC | CBT_F1_RTC | CBT_F1_EBDA
| (CONFIG_KBD_CALL_INT15_4F ? CBT_F1_INT154F : 0)),
.feature2 = CBT_F2_INT1609,
.feature3 = 0,
.feature4 = 0,
.feature5 = 0,
};
/****************************************************************
* GDT and IDT tables
****************************************************************/
struct descloc_s {
u16 length;
u32 addr;
} PACKED;
// Real mode IDT descriptor
struct descloc_s rmode_IDT_info VAR16_32 = {
.length = sizeof(struct rmode_IVT) - 1,
.addr = (u32)MAKE_FARPTR(SEG_IVT, 0),
};
// Dummy IDT that forces a machine shutdown if an irq happens in
// protected mode.
u8 dummy_IDT VAR16_32;
// Protected mode IDT descriptor
struct descloc_s pmode_IDT_info VAR16_32 = {
.length = sizeof(dummy_IDT) - 1,
.addr = (u32)MAKE_FARPTR(SEG_BIOS, &dummy_IDT),
};
// GDT
u64 rombios32_gdt[] VAR16_32 __aligned(8) = {
// First entry can't be used.
0x0000000000000000LL,
// 32 bit flat code segment (SEG32_MODE32_CS)
0x00cf9b000000ffffLL,
// 32 bit flat data segment (SEG32_MODE32_DS)
0x00cf93000000ffffLL,
// 16 bit code segment base=0xf0000 limit=0xffff (SEG32_MODE16_CS)
0x00009b0f0000ffffLL,
// 16 bit data segment base=0x0 limit=0xffff (SEG32_MODE16_DS)
0x000093000000ffffLL,
// 16 bit code segment base=0 limit=0xffffffff (SEG32_MODE16BIG_CS)
0x008f9b000000ffffLL,
// 16 bit data segment base=0 limit=0xffffffff (SEG32_MODE16BIG_DS)
0x008f93000000ffffLL,
};
// GDT descriptor
struct descloc_s rombios32_gdt_48 VAR16_32 = {
.length = sizeof(rombios32_gdt) - 1,
.addr = (u32)MAKE_FARPTR(SEG_BIOS, rombios32_gdt),
};
/****************************************************************
* Misc fixed vars
****************************************************************/
char BiosCopyright[] VAR16FIXED(0xff00) =
"(c) 2002 MandrakeSoft S.A. Written by Kevin Lawton & the Bochs team.";
// BIOS build date
char BiosDate[] VAR16FIXED(0xfff5) = "06/23/99";
u8 BiosModelId VAR16FIXED(0xfffe) = CONFIG_MODEL_ID;
u8 BiosChecksum VAR16FIXED(0xffff);
// XXX - Initial Interrupt Vector Offsets Loaded by POST
u8 InitVectors[13] VAR16FIXED(0xfef3);
// XXX - INT 1D - SYSTEM DATA - VIDEO PARAMETER TABLES
u8 VideoParams[88] VAR16FIXED(0xf0a4);

2
src/null.c
View File

@ -1,2 +0,0 @@
// GCC does something odd when one uses -combine with just one .c
// file. So this dummy file makes gcc happy.

3
src/post.c
View File

@ -245,8 +245,7 @@ _start()
interactive_bootmenu();
// Setup bios checksum.
extern char bios_checksum;
bios_checksum = -checksum((u8*)BUILD_BIOS_ADDR, BUILD_BIOS_SIZE - 1);
BiosChecksum = -checksum((u8*)BUILD_BIOS_ADDR, BUILD_BIOS_SIZE - 1);
// Prep for boot process.
make_bios_readonly();

114
src/romlayout.S
View File

@ -451,88 +451,21 @@ permanent_halt:
ORG 0xe2c3
IRQ_ENTRY nmi
/****************************************************************
* GDT and IDT tables (between 0xe2c3 - 0xe3fe)
****************************************************************/
// 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
.type pmode_IDT_info, @object
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
.type rmode_IDT_info, @object
rmode_IDT_info:
.word 0x03ff // limit 15:00
.long 0 // base 16:47
.type rombios32_gdt_48, @object
rombios32_gdt_48:
.word (rombios32_gdt_end - rombios32_gdt)
.long (BUILD_BIOS_ADDR + rombios32_gdt)
//.balign 8
.type rombios32_gdt, @object
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:
/****************************************************************
* Interrupt entry points (continued)
****************************************************************/
ORG 0xe3fe
.global entry_13_official
entry_13_official:
jmp entry_13
ORG 0xe401
.type __fdpt, @object
__fdpt:
// XXX - Fixed Disk Parameter Table
.space 16
// 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
.type __brgt, @object
__brgt:
// XXX - Baud Rate Generator Table
.space 16
// 0xe729 - BaudTable in serial.c
ORG 0xe739
IRQ_ENTRY_ARG 14
@ -549,9 +482,7 @@ __brgt:
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
@ -564,11 +495,7 @@ __int10_0x0f:
ORG 0xf065
IRQ_ENTRY_ARG 10
ORG 0xf0a4
.type __int1d, @object
__int1d:
// XXX - INT 1D - SYSTEM DATA - VIDEO PARAMETER TABLES
.space 0x58
// 0xf0a4 - VideoParams in misc.c
ORG 0xf841
.global entry_12_official
@ -608,9 +535,7 @@ entry_18:
pushl $_code32_handle_18
jmp transition32
ORG 0xfa6e
.include "out/font.proc.16.s"
.text
// 0xfa6e - vgafont8 in font.c
ORG 0xfe6e
IRQ_ENTRY_ARG 1a
@ -618,16 +543,9 @@ entry_18:
ORG 0xfea5
IRQ_ENTRY 08
ORG 0xfef3
__initvector:
// XXX - Initial Interrupt Vector Offsets Loaded by POST
.space 13
// 0xfef3 - InitVectors in misc.c
ORG 0xff00
.type __copyright, @object
__copyright:
// XXX - BIOS_COPYRIGHT_STRING
.asciz "(c) 2002 MandrakeSoft S.A. Written by Kevin Lawton & the Bochs team."
// 0xff00 - BiosCopyright in misc.c
ORG 0xff53
.global dummy_iret_handler
@ -642,20 +560,10 @@ dummy_iret_handler:
reset_vector:
ljmpw $SEG_BIOS, $post16
ORG 0xfff5
.type __biosdate, @object
__biosdate:
// BIOS build date
.ascii "06/23/99"
// 0xfff5 - BiosDate in misc.c
ORG 0xfffe
.type __model_id, @object
__model_id:
.byte CONFIG_MODEL_ID
// 0xfffe - BiosModelId in misc.c
.global bios_checksum
.type bios_checksum, @object
bios_checksum:
.byte 0x00
// 0xffff - BiosChecksum in misc.c
.end

3
src/serial.c
View File

@ -170,6 +170,9 @@ handle_14(struct bregs *regs)
}
}
// XXX - Baud Rate Generator Table
u8 BaudTable[16] VAR16FIXED(0xe729);
/****************************************************************
* LPT ports

68
src/system.c
View File

@ -1,4 +1,4 @@
// 16bit system callbacks
// Handler for int 0x15 "system" calls
//
// Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
// Copyright (C) 2002 MandrakeSoft S.A.
@ -269,10 +269,6 @@ handle_15e801(struct bregs *regs)
// Info on e820 map location and size.
struct e820entry *e820_list VAR16_32;
int e820_count VAR16_32;
// Amount of continuous ram under 4Gig
u32 RamSize VAR16_32;
// Amount of continuous ram >4Gig
u64 RamSizeOver4G;
static void
handle_15e820(struct bregs *regs)
@ -340,65 +336,3 @@ handle_15(struct bregs *regs)
default: handle_15XX(regs); break;
}
}
// INT 12h Memory Size Service Entry Point
void VISIBLE16
handle_12(struct bregs *regs)
{
debug_enter(regs, DEBUG_HDL_12);
regs->ax = GET_BDA(mem_size_kb);
}
// INT 11h Equipment List Service Entry Point
void VISIBLE16
handle_11(struct bregs *regs)
{
debug_enter(regs, DEBUG_HDL_11);
regs->ax = GET_BDA(equipment_list_flags);
}
// INT 05h Print Screen Service Entry Point
void VISIBLE16
handle_05(struct bregs *regs)
{
debug_enter(regs, DEBUG_HDL_05);
}
// INT 10h Video Support Service Entry Point
void VISIBLE16
handle_10(struct bregs *regs)
{
debug_enter(regs, DEBUG_HDL_10);
// dont do anything, since the VGA BIOS handles int10h requests
}
void VISIBLE16
handle_nmi()
{
debug_isr(DEBUG_ISR_nmi);
BX_PANIC("NMI Handler called\n");
}
void
mathcp_setup()
{
dprintf(3, "math cp init\n");
// 80x87 coprocessor installed
SETBITS_BDA(equipment_list_flags, 0x02);
enable_hwirq(13, entry_75);
}
// INT 75 - IRQ13 - MATH COPROCESSOR EXCEPTION
void VISIBLE16
handle_75()
{
debug_isr(DEBUG_ISR_75);
// clear irq13
outb(0, PORT_MATH_CLEAR);
// clear interrupt
eoi_pic2();
// legacy nmi call
u32 eax=0, flags;
call16_simpint(0x02, &eax, &flags);
}

3
src/types.h
View File

@ -32,6 +32,8 @@ union u64_u32_u {
# define VAR16 __attribute__((section(".data16." __FILE__ "." __stringify(__LINE__))))
// Designate a variable as visible to both 32bit and 16bit code.
# define VAR16_32 VAR16 __VISIBLE
// Designate a variable at a specific 16bit address
# define VAR16FIXED(addr) __aligned(1) __VISIBLE __attribute__((section(".fixedaddr." __stringify(addr))))
// Designate top-level assembler as 16bit only.
# define ASM16(code) asm(".section .text.asm." __FILE__ "." __stringify(__LINE__) "\n\t" code)
#else
@ -39,6 +41,7 @@ union u64_u32_u {
# define VISIBLE32 __VISIBLE
# define VAR16 __attribute__((section(".discard.var16")))
# define VAR16_32 VAR16 __VISIBLE __attribute__((weak))
# define VAR16FIXED(addr) VAR16_32
# define ASM16(code)
#endif

3
src/util.h
View File

@ -184,4 +184,7 @@ void mtrr_setup(void);
// romlayout.S
void reset_vector() __attribute__ ((noreturn));
// misc.c
extern u8 BiosChecksum;
#endif // util.h