288 lines
8.1 KiB
C++
288 lines
8.1 KiB
C++
/*
|
|
* Copyright (C) 2002-2004 The DOSBox Team
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
*/
|
|
|
|
#include <time.h>
|
|
|
|
#include "dosbox.h"
|
|
#include "timer.h"
|
|
#include "pic.h"
|
|
#include "inout.h"
|
|
#include "mem.h"
|
|
#include "bios.h"
|
|
|
|
static struct {
|
|
Bit8u regs[0x40];
|
|
bool nmi;
|
|
bool bcd;
|
|
Bit8u reg;
|
|
struct {
|
|
bool enabled;
|
|
Bit8u div;
|
|
Bitu micro;
|
|
} timer;
|
|
struct {
|
|
Bit64u timer;
|
|
Bit64u ended;
|
|
Bit64u alarm;
|
|
} last;
|
|
bool ack;
|
|
bool update_ended;
|
|
} cmos;
|
|
|
|
static void cmos_timerevent(Bitu val) {
|
|
PIC_ActivateIRQ(8);
|
|
if(cmos.timer.enabled) PIC_AddEvent(cmos_timerevent,cmos.timer.micro);
|
|
if (cmos.ack) {
|
|
PIC_AddEvent(cmos_timerevent,cmos.timer.micro);
|
|
cmos.regs[0x0c]|=0x0a0;
|
|
cmos.ack=false;
|
|
}
|
|
}
|
|
|
|
static void cmos_checktimer(void) {
|
|
PIC_RemoveEvents(cmos_timerevent);
|
|
if (cmos.timer.div<=2) cmos.timer.div+=7;
|
|
cmos.timer.micro=(Bitu) (1000000.0/(32768.0 / (1 << (cmos.timer.div - 1))));
|
|
if (!cmos.timer.div || !cmos.timer.enabled) return;
|
|
LOG(LOG_PIT,LOG_NORMAL)("RTC Timer at %f hz",1000000.0/cmos.timer.micro);
|
|
PIC_AddEvent(cmos_timerevent,cmos.timer.micro);
|
|
}
|
|
|
|
void cmos_selreg(Bitu port,Bitu val,Bitu iolen) {
|
|
cmos.reg=val & 0x3f;
|
|
cmos.nmi=(val & 0x80)>0;
|
|
}
|
|
|
|
static void cmos_writereg(Bitu port,Bitu val,Bitu iolen) {
|
|
switch (cmos.reg) {
|
|
case 0x00: /* Seconds */
|
|
case 0x02: /* Minutes */
|
|
case 0x04: /* Hours */
|
|
case 0x06: /* Day of week */
|
|
case 0x07: /* Date of month */
|
|
case 0x08: /* Month */
|
|
case 0x09: /* Year */
|
|
/* Ignore writes to change alarm */
|
|
break;
|
|
case 0x01: /* Seconds Alarm */
|
|
case 0x03: /* Minutes Alarm */
|
|
case 0x05: /* Hours Alarm */
|
|
LOG(LOG_BIOS,LOG_NORMAL)("CMOS:Trying to set alarm");
|
|
cmos.regs[cmos.reg]=val;
|
|
break;
|
|
case 0x0a: /* Status reg A */
|
|
cmos.regs[cmos.reg]=val & 0x7f;
|
|
if ((val & 0x70)!=0x20) LOG(LOG_BIOS,LOG_ERROR)("CMOS Illegal 22 stage divider value");
|
|
cmos.timer.div=(val & 0xf);
|
|
cmos_checktimer();
|
|
break;
|
|
case 0x0b: /* Status reg B */
|
|
cmos.bcd=!(val & 0x4);
|
|
cmos.regs[cmos.reg]=val & 0x7f;
|
|
cmos.timer.enabled=(val & 0x40)>0;
|
|
if (val&0x10) LOG(LOG_BIOS,LOG_ERROR)("CMOS:Updated ended interrupt not supported yet");
|
|
cmos_checktimer();
|
|
break;
|
|
case 0x0f: /* Shutdown status byte */
|
|
cmos.regs[cmos.reg]=val & 0x7f;
|
|
break;
|
|
default:
|
|
cmos.regs[cmos.reg]=val & 0x7f;
|
|
LOG(LOG_BIOS,LOG_ERROR)("CMOS:WRite to unhandled register %x",cmos.reg);
|
|
}
|
|
}
|
|
|
|
|
|
#define MAKE_RETURN(_VAL) (cmos.bcd ? (((_VAL / 10) << 4) | (_VAL % 10)) : _VAL);
|
|
|
|
static Bitu cmos_readreg(Bitu port,Bitu iolen) {
|
|
if (cmos.reg>0x3f) {
|
|
LOG(LOG_BIOS,LOG_ERROR)("CMOS:Read from illegal register %x",cmos.reg);
|
|
return 0xff;
|
|
}
|
|
Bitu drive_a, drive_b;
|
|
Bit8u hdparm;
|
|
time_t curtime;
|
|
struct tm *loctime;
|
|
|
|
/* Get the current time. */
|
|
curtime = time (NULL);
|
|
|
|
/* Convert it to local time representation. */
|
|
loctime = localtime (&curtime);
|
|
|
|
switch (cmos.reg) {
|
|
case 0x00: /* Seconds */
|
|
return MAKE_RETURN(loctime->tm_sec);
|
|
case 0x02: /* Minutes */
|
|
return MAKE_RETURN(loctime->tm_min);
|
|
case 0x04: /* Hours */
|
|
return MAKE_RETURN(loctime->tm_hour);
|
|
case 0x06: /* Day of week */
|
|
return MAKE_RETURN(loctime->tm_wday);
|
|
case 0x07: /* Date of month */
|
|
return MAKE_RETURN(loctime->tm_mday);
|
|
case 0x08: /* Month */
|
|
return MAKE_RETURN(loctime->tm_mon);
|
|
case 0x09: /* Year */
|
|
return MAKE_RETURN(loctime->tm_year);
|
|
case 0x01: /* Seconds Alarm */
|
|
case 0x03: /* Minutes Alarm */
|
|
case 0x05: /* Hours Alarm */
|
|
return cmos.regs[cmos.reg];
|
|
case 0x0a: /* Status register C */
|
|
if (PIC_Index()<0x2) {
|
|
return (cmos.regs[0x0a]&0x7f) | 0x80;
|
|
} else {
|
|
return (cmos.regs[0x0a]&0x7f);
|
|
}
|
|
case 0x0c: /* Status register C */
|
|
if (cmos.timer.enabled) {
|
|
/* In periodic interrupt mode only care for those flags */
|
|
Bit8u val=cmos.regs[0xc];
|
|
cmos.regs[0xc]=0;
|
|
return val;
|
|
} else {
|
|
/* Give correct values at certain times */
|
|
Bit8u val=0;
|
|
Bit64u index=PIC_MicroCount();
|
|
if (index>=(cmos.last.timer+cmos.timer.micro)) {
|
|
cmos.last.timer=index;
|
|
val|=0x40;
|
|
}
|
|
if (index>=(cmos.last.ended+1000000)) {
|
|
cmos.last.ended=index;
|
|
val|=0x10;
|
|
}
|
|
return val;
|
|
}
|
|
case 0x10: /* Floppy size */
|
|
drive_a = 0;
|
|
drive_b = 0;
|
|
if(imageDiskList[0] != NULL) drive_a = imageDiskList[0]->GetBiosType();
|
|
if(imageDiskList[1] != NULL) drive_b = imageDiskList[1]->GetBiosType();
|
|
return ((drive_a << 4) | (drive_b));
|
|
/* First harddrive info */
|
|
case 0x12:
|
|
hdparm = 0;
|
|
if(imageDiskList[2] != NULL) hdparm |= 0xf;
|
|
if(imageDiskList[3] != NULL) hdparm |= 0xf0;
|
|
return hdparm;
|
|
case 0x19:
|
|
if(imageDiskList[2] != NULL) return 47; /* User defined type */
|
|
return 0;
|
|
case 0x1b:
|
|
if(imageDiskList[2] != NULL) return (imageDiskList[2]->cylinders & 0xff);
|
|
return 0;
|
|
case 0x1c:
|
|
if(imageDiskList[2] != NULL) return ((imageDiskList[2]->cylinders & 0xff00)>>8);
|
|
return 0;
|
|
case 0x1d:
|
|
if(imageDiskList[2] != NULL) return (imageDiskList[2]->heads);
|
|
return 0;
|
|
case 0x1e:
|
|
if(imageDiskList[2] != NULL) return 0xff;
|
|
return 0;
|
|
case 0x1f:
|
|
if(imageDiskList[2] != NULL) return 0xff;
|
|
return 0;
|
|
case 0x20:
|
|
if(imageDiskList[2] != NULL) return (0xc0 | (((imageDiskList[2]->heads) > 8) << 3));
|
|
return 0;
|
|
case 0x21:
|
|
if(imageDiskList[2] != NULL) return (imageDiskList[2]->cylinders & 0xff);
|
|
return 0;
|
|
case 0x22:
|
|
if(imageDiskList[2] != NULL) return ((imageDiskList[2]->cylinders & 0xff00)>>8);
|
|
return 0;
|
|
case 0x23:
|
|
if(imageDiskList[2] != NULL) return (imageDiskList[2]->sectors);
|
|
return 0;
|
|
/* Second harddrive info */
|
|
case 0x1a:
|
|
if(imageDiskList[3] != NULL) return 47; /* User defined type */
|
|
return 0;
|
|
case 0x24:
|
|
if(imageDiskList[3] != NULL) return (imageDiskList[3]->cylinders & 0xff);
|
|
return 0;
|
|
case 0x25:
|
|
if(imageDiskList[3] != NULL) return ((imageDiskList[3]->cylinders & 0xff00)>>8);
|
|
return 0;
|
|
case 0x26:
|
|
if(imageDiskList[3] != NULL) return (imageDiskList[3]->heads);
|
|
return 0;
|
|
case 0x27:
|
|
if(imageDiskList[3] != NULL) return 0xff;
|
|
return 0;
|
|
case 0x28:
|
|
if(imageDiskList[3] != NULL) return 0xff;
|
|
return 0;
|
|
case 0x29:
|
|
if(imageDiskList[3] != NULL) return (0xc0 | (((imageDiskList[3]->heads) > 8) << 3));
|
|
return 0;
|
|
case 0x2a:
|
|
if(imageDiskList[3] != NULL) return (imageDiskList[3]->cylinders & 0xff);
|
|
return 0;
|
|
case 0x2b:
|
|
if(imageDiskList[3] != NULL) return ((imageDiskList[3]->cylinders & 0xff00)>>8);
|
|
return 0;
|
|
case 0x2c:
|
|
if(imageDiskList[3] != NULL) return (imageDiskList[3]->sectors);
|
|
return 0;
|
|
case 0x39:
|
|
return 0;
|
|
case 0x3a:
|
|
return 0;
|
|
|
|
|
|
case 0x0b: /* Status register B */
|
|
case 0x0f: /* Shutdown status byte */
|
|
case 0x17: /* Extended memory in KB Low Byte */
|
|
case 0x18: /* Extended memory in KB High Byte */
|
|
case 0x30: /* Extended memory in KB Low Byte */
|
|
case 0x31: /* Extended memory in KB High Byte */
|
|
// LOG(LOG_BIOS,LOG_NORMAL)("CMOS:Read from reg %F : %04X",cmos.reg,cmos.regs[cmos.reg]);
|
|
return cmos.regs[cmos.reg];
|
|
default:
|
|
LOG(LOG_BIOS,LOG_NORMAL)("CMOS:Read from reg %F",cmos.reg);
|
|
return cmos.regs[cmos.reg];
|
|
}
|
|
}
|
|
|
|
void CMOS_SetRegister(Bitu regNr, Bit8u val)
|
|
{
|
|
cmos.regs[regNr] = val;
|
|
};
|
|
|
|
void CMOS_Init(Section* sec) {
|
|
IO_RegisterWriteHandler(0x70,cmos_selreg,IO_MB);
|
|
IO_RegisterWriteHandler(0x71,cmos_writereg,IO_MB);
|
|
IO_RegisterReadHandler(0x71,cmos_readreg,IO_MB);
|
|
cmos.timer.enabled=false;
|
|
cmos.reg=0xa;
|
|
cmos_writereg(0x71,0x26,1);
|
|
cmos.reg=0xb;
|
|
cmos_writereg(0x71,0,1);
|
|
/* Fill in extended memory size */
|
|
Bitu exsize=(MEM_TotalPages()*4)-1024;
|
|
cmos.regs[0x17]=(Bit8u)exsize;
|
|
cmos.regs[0x18]=(Bit8u)(exsize >> 8);
|
|
cmos.regs[0x30]=(Bit8u)exsize;
|
|
cmos.regs[0x31]=(Bit8u)(exsize >> 8);
|
|
}
|
|
|