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yui committed Oct 16, 2003
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398 changes: 398 additions & 0 deletions bios/bios.c
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#include "compiler.h"
#include "dosio.h"
#include "i286.h"
#include "memory.h"
#include "pccore.h"
#include "iocore.h"
#include "bios.h"
#include "biosmem.h"
#include "keytable.res"
#include "itfrom.res"
#include "lio.h"
#include "fdfmt.h"
#include "fddfile.h"
#include "fdd_mtr.h"


BOOL biosrom = FALSE;

static const char file_biosrom[] = "bios.rom";

static const char neccheck[] = "Copyright (C) 1983 by NEC Corporation";

// 00/05/18 MS-DOS6.2 on PC-9801VX calling proc
static const BYTE printmain[] = {0x90, 0x5a, 0x1f, 0xcf};

static const BYTE nosyscode[] = {
0xeb,0x05,0xbe,0x6f,0x00,0xeb,0x03,0xbe,0x47,0x00,0xb8,0x00,
0x10,0xbb,0x00,0x80,0x8e,0xd0,0x8b,0xe3,0x8c,0xc8,0x8e,0xd8,
0xb8,0x00,0xa0,0x8e,0xc0,0xb9,0x00,0x10,0xb8,0x20,0x00,0x33,
0xff,0xfc,0xf3,0xab,0xb0,0xe1,0xb9,0xe0,0x1f,0xaa,0x47,0xe2,
0xfc,0x2e,0xad,0x8b,0xf8,0x2e,0xad,0x85,0xc0,0x74,0x0a,0xab,
0x0a,0xe4,0x74,0xf5,0x83,0xc7,0x02,0xeb,0xf0,0xeb,0xfe,0xac,
0x07,0x05,0x37,0x05,0x39,0x05,0x46,0x05,0x60,0x05,0x47,0x05,
0x23,0x05,0x39,0x05,0x2f,0x04,0x72,0x05,0x3b,0x05,0x43,0x05,
0x48,0x04,0x37,0x04,0x46,0x04,0x2f,0x04,0x40,0x04,0x35,0x04,
0x24,0x00,0x00,0xae,0x07,0x42,0x00,0x41,0x00,0x53,0x00,0x49,
0x00,0x43,0x00,0x04,0x4e,0x15,0x2f,0x26,0x30,0x04,0x4b,0x04,
0x4f,0x20,0x00,0x42,0x00,0x49,0x00,0x4f,0x00,0x53,0x00,0x2e,
0x00,0x52,0x00,0x4f,0x00,0x4d,0x00,0x04,0x2c,0x29,0x2c,0x2d,
0x57,0x04,0x47,0x04,0x39,0x00,0x00};


static void bios_reinitbyswitch(void) {

BYTE prxcrt;
BYTE prxdupd;
BYTE biosflag;
BYTE ext_mem;

CPUTYPE = 0;
prxcrt = 0xc8;
if (gdc.display & 2) {
prxcrt |= 0x04; // color16
}
if (!(np2cfg.dipsw[0] & 0x80)) { // dipsw1-8 on
prxcrt |= 0x01;
}
if (grcg.chip) {
prxcrt |= 0x02;
}
mem[MEMB_PRXCRT] = prxcrt;

prxdupd = 0x18;
if (grcg.chip >= 3) {
prxdupd |= 0x40;
}
if (!(np2cfg.dipsw[1] & 0x80)) { // dipsw2-8 on
prxdupd |= 0x20;
}
mem[MEMB_PRXDUPD] = prxdupd;

biosflag = 0x20;
if (pc.cpumode & CPUMODE_8MHz) {
biosflag |= 0x80;
}
biosflag |= mem[0xa3fea] & 7;
if (!(np2cfg.dipsw[2] & 0x80)) {
ext_mem = np2cfg.EXTMEM; // ver0.28
}
else {
CPUTYPE = CPUTYPE_V30;
ext_mem = 0;
biosflag |= 0x40;
}
if (extmem_init(ext_mem)) { // ver0.28
ext_mem = 0; // メモリ確保に失敗
}
mem[MEMB_BIOS_FLAG] = biosflag;
mem[MEMB_EXPMMSZ] = (BYTE)(ext_mem << 3);
mem[MEMB_CRT_RASTER] = 0x0f;

gdc.display &= ~4;
if (!(np2cfg.dipsw[0] & 0x04)) { // dipsw1-3 on
gdc.display |= 4;
}
gdcs.textdisp |= GDCSCRN_EXT;
}

static void bios_vectorset(void) { // ver0.30

UINT i;

for (i=0; i<0x400; i+=4) {
SETBIOSMEM16(i+0, BIOSOFST_IRET);
SETBIOSMEM16(i+2, BIOS_SEG);
}
for (i=0; i<0x20; i++) {
*(UINT16 *)(mem + (i*4)) = *(UINT16 *)(mem + 0xfd868 + (i*2));
}
SETBIOSMEM32(0x1e*4, 0xe8000000);
}


// CDSで見てる為、変更…(涙
static const UINT16 biosoffset[0x20] = {
BIOSOFST_IRET, BIOSOFST_IRET, BIOSOFST_02, BIOSOFST_IRET,
BIOSOFST_IRET, BIOSOFST_IRET, BIOSOFST_IRET, BIOSOFST_IRET,

BIOSOFST_08, BIOSOFST_09, BIOSOFST_EOIM, BIOSOFST_EOIM,
BIOSOFST_0c, BIOSOFST_EOIM, BIOSOFST_EOIM, BIOSOFST_EOIM,

BIOSOFST_EOIS, BIOSOFST_EOIS, BIOSOFST_12, BIOSOFST_13,
BIOSOFST_EOIS, BIOSOFST_EOIS, BIOSOFST_EOIS, BIOSOFST_EOIS,

BIOSOFST_18, BIOSOFST_19, BIOSOFST_1a, BIOSOFST_1b,
BIOSOFST_1c, BIOSOFST_IRET, BIOSOFST_1e, BIOSOFST_IRET};


void bios_init(void) {

FILEH fh;
UINT i;
UINT pos;

biosrom = FALSE;

// まぁDISK BASIC動くようになるからいいんじゃないですか？
// BASIC BIOSは 8086コードのように見えるけど…
fh = file_open_c(file_biosrom);
if (fh != FILEH_INVALID) {
if (file_read(fh, mem + 0x0e8000, 0x18000) == 0x18000) {
biosrom = TRUE;
}
file_close(fh);
}
if (!biosrom) {
CopyMemory(mem + 0x0e8000, nosyscode, sizeof(nosyscode));
}

itf.bank = 0;

// BIOS hookのアドレス変更
for (i=0; i<0x20; i++) {
STOREINTELWORD(mem + 0xfd868 + i*2, biosoffset[i]);
}
SETBIOSMEM16(BIOS_BASE + BIOSOFST_IRET, 0x50cf);
SETBIOSMEM16(BIOS_BASE + BIOSOFST_WAIT, 0xcf90);
for (i=(BIOS_BASE+BIOSOFST_EOIM); i<=(BIOS_BASE+BIOSOFST_1c); i+=2) {
SETBIOSMEM16(i, 0xcf90);
}
CopyMemory(mem + BIOS_BASE + BIOSOFST_PRT, printmain, sizeof(printmain));

bios_vectorset(); // ver0.29
if (!biosrom) {
lio_init();
}

SETBIOSMEM16(0xfd800, 0xcb90);
SETBIOSMEM16(0xfd802, 0xcb90);
for (i=0; i<8; i+=2) {
STOREINTELWORD(mem + 0xfd800 + 0x1aaf + i, 0x1ab7);
STOREINTELWORD(mem + 0xfd800 + 0x1ad7 + i, 0x1adf);
STOREINTELWORD(mem + 0xfd800 + 0x2361 + i, 0x1980); // ver0.31
}
CopyMemory(mem + 0xfd800 + 0x1ab7, fdfmt2hd, sizeof(fdfmt2hd));
CopyMemory(mem + 0xfd800 + 0x1adf, fdfmt2dd, sizeof(fdfmt2dd));
CopyMemory(mem + 0xfd800 + 0x1980, fdfmt144, sizeof(fdfmt144)); // ver0.31

SETBIOSMEM16(0xfffe8, 0xcb90);
SETBIOSMEM16(0xfffec, 0xcb90);
mem[0xffff0] = 0xea;
STOREINTELDWORD(mem + 0xffff1, 0xfd800000);

#if 1
CopyMemory(mem + ITF_ADRS, itfrom, sizeof(itfrom));
mem[ITF_ADRS + 0x7ff0] = 0xea;
STOREINTELDWORD(mem + ITF_ADRS + 0x7ff1, 0xf8000000);
#if 0
fh = file_create("itf.rom");
if (fh != FILEH_INVALID) {
file_write(fh, itfrom, sizeof(itfrom));
file_close(fh);
}
#endif
#else
fh = file_open_c("itf.rom");
if (fh != FILEH_INVALID) {
file_read(fh, &mem[ITF_ADRS], 0x8000);
file_close(fh);
}
#endif
if (!biosrom) {
CopyMemory(mem + 0xe8dd8, neccheck, 0x25);
pos = LOADINTELWORD(itfrom + 2);
CopyMemory(mem + 0xf538e, itfrom + pos, 0x27);
}

bios_reinitbyswitch();
mem[MEMB_CRT_STS_FLAG] = 0x84;
mem[MEMB_BIOS_FLAG0] = 0x03; // 00/05/17 beep tone
mem[MEMB_F2DD_MODE] = 0xff; // ver0.29
SETBIOSMEM16(MEMW_DISK_EQUIP, 0x0003); // ver0.29
SETBIOSMEM32(MEMD_F2DD_POINTER, 0xfd801ad7);
SETBIOSMEM32(MEMD_F2HD_POINTER, 0xfd801aaf);
mem[0x005ae] |= 0x03; // ver0.31

CopyMemory(mem + 0x0fde00, keytable[0], 0x300);
bios0x09_init();
}

static void bios_boot(void) {

if (sysport.c & 0x80) {
if (!(sysport.c & 0x20)) {
bios_reinitbyswitch();
}
I286_CS = 0x0000;
I286_IP = 0x04f8;
I286_DS = 0x0000;
I286_DX = 0x43d;
I286_AL = 0x10;
mem[0x004f8] = 0xee; // out dx, al
mem[0x004f9] = 0xea; // call far
SETBIOSMEM32(0x004fa, 0xffff0000);
}
else {
I286_SP = GETBIOSMEM16(0x00404);
I286_SS = GETBIOSMEM16(0x00406);
}
}


UINT MEMCALL biosfunc(UINT32 adrs) {

UINT16 bootseg;

if ((itf.bank) && (adrs >= 0xf8000) && (adrs < 0x100000)) {
I286_IP--;
nevent.remainclock = -1;
return(1);
}

switch(adrs) { // ver0.30
case BIOS_BASE + BIOSOFST_EOIM:
nevent.remainclock -= 300;
iocore_out8(0x00, 0x20);
return(0);

case BIOS_BASE + BIOSOFST_EOIS:
iocore_out8(0x08, 0x20);
if (!pic.pi[1].isr) {
iocore_out8(0x00, 0x20);
}
return(0);

case BIOS_BASE + BIOSOFST_02:
nevent.remainclock -= 300;
bios0x02();
return(1);

case BIOS_BASE + BIOSOFST_08:
nevent.remainclock -= 300;
bios0x08();
return(1);

case BIOS_BASE + BIOSOFST_09:
nevent.remainclock -= 300;
bios0x09();
return(1);

case BIOS_BASE + BIOSOFST_0c:
nevent.remainclock -= 500;
bios0x0c();
return(1);

case BIOS_BASE + BIOSOFST_12:
nevent.remainclock -= 500;
bios0x12();
return(1);

case BIOS_BASE + BIOSOFST_13:
nevent.remainclock -= 500;
bios0x13();
return(1);

case BIOS_BASE + BIOSOFST_18:
nevent.remainclock -= 200;
bios0x18();
return(1);

case BIOS_BASE + BIOSOFST_19:
nevent.remainclock -= 200;
bios0x19();
return(1);

case BIOS_BASE + BIOSOFST_1a:
nevent.remainclock -= 200;
bios0x1a();
return(1);

case BIOS_BASE + BIOSOFST_1b:
nevent.remainclock -= 200;
bios0x1b();
return(1);

case BIOS_BASE + BIOSOFST_1c:
nevent.remainclock -= 200;
bios0x1c();
return(1);

case BIOS_BASE + BIOSOFST_WAIT:
I286_STI;
if (fddmtr_biosbusy) { // ver0.26
I286_IP--;
nevent.remainclock = -1;
}
else {
switch(CTRL_FDMEDIA) {
case DISKTYPE_2HD:
if (pic.pi[1].isr & PIC_INT42) {
I286_IP--;
nevent.remainclock -= 1000;
}
break;
case DISKTYPE_2DD:
if (pic.pi[1].isr & PIC_INT41) {
I286_IP--;
nevent.remainclock -= 1000;
}
break;
}
}
return(1);

case BIOS_BASE + BIOSOFST_PRT:
bios0x1a_main();
return(0);

case 0xfd800: // リセット
bios_boot();
return(1);

case 0xfd802: // ブート
bios_reinitbyswitch(); // ver0.27
bios_vectorset(); // ver0.29
bootseg = bootstrapload();
I286_STI;
I286_CS = (bootseg != 0)?bootseg:0xe800;
I286_DS = 0x0000;
I286_SS = 0x0030;
I286_SP = 0x00e6;
I286_IP = 0x0000;
return(1);

case 0xfffe8: // ブートストラップロード
nevent.remainclock -= 2000;
bootseg = bootstrapload();
if (bootseg) {
I286_STI;
I286_CS = bootseg;
I286_IP = 0x0000;
I286_SS = 0x0030;
I286_SP = 0x00e6;
return(1);
}
return(0);

case 0xfffec:
nevent.remainclock -= 2000;
bootstrapload();
return(0);
}

if ((adrs >= 0xf9a00) && (adrs < 0x0f9a24)) {
if (!(adrs & 1)) {
bios_lio((BYTE)((adrs - 0xf9a00) >> 1));
}
return(0);
}

if (biosrom) {
return(0);
}
I286_IP--;
nevent.remainclock = -1;
return(1);
}

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