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Support for reading out time/date using hosts time.

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Support for reading out extended memory size.


Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@964
This commit is contained in:
Sjoerd van der Berg 2003-04-27 07:06:20 +00:00
parent 9e0452b931
commit 6d4a305923
1 changed files with 61 additions and 8 deletions
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69
src/hardware/cmos.cpp
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@ -16,16 +16,18 @@
* 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 "config.h"
#include "mem.h"
static struct {
Bit8u regs[0x40];
bool nmi;
bool bcd;
Bit8u reg;
struct {
bool enabled;
@ -35,7 +37,6 @@ static struct {
Bit8u status_c;
bool ack;
bool update_ended;
} cmos;
static void cmos_timerevent(void) {
@ -64,17 +65,21 @@ void cmos_selreg(Bit32u port,Bit8u val) {
static void cmos_writereg(Bit32u port,Bit8u val) {
switch (cmos.reg) {
case 0x00: /* Seconds */
case 0x01: /* Seconds Alarm */
case 0x02: /* Minutes */
case 0x03: /* Minutes Alarm */
case 0x04: /* Hours */
case 0x05: /* Hours Alarm */
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,"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_ERROR|LOG_BIOS,"CMOS Illegal 22 stage divider value");
@ -82,30 +87,71 @@ static void cmos_writereg(Bit32u port,Bit8u val) {
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_ERROR|LOG_BIOS,"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_ERROR|LOG_BIOS,"CMOS:WRite to unhandled register %x",cmos.reg);
LOG(LOG_ERROR|LOG_BIOS,"CMOS:WRite to unhandled register %x",cmos.reg);
}
}
#define MAKE_RETURN(_VAL) (cmos.bcd ? (((_VAL / 10) << 4) | (_VAL % 10)) : _VAL);
static Bit8u cmos_readreg(Bit32u port) {
if (cmos.reg>0x3f) {
LOG(LOG_ERROR|LOG_BIOS,"CMOS:Read from illegal register %x",cmos.reg);
return 0xff;
}
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 0x0c:
if (cmos.ack) return 0;
else {
cmos.ack=true;
return 0x80|cmos.status_c;
}
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 */
return cmos.regs[cmos.reg];
default:
LOG(LOG_BIOS,"CMOS:Read from reg %F",cmos.reg);
return cmos.regs[cmos.reg];
}
}
@ -117,6 +163,13 @@ void CMOS_Init(Section* sec) {
cmos.timer.enabled=false;
cmos.reg=0xa;
cmos_writereg(0x71,0x26);
cmos.reg=0xb;
cmos_writereg(0x71,0);
/* Fill in extended memory size */
Bitu exsize=MEM_TotalSize()-1024;
cmos.regs[0x17]=(Bit8u)exsize;
cmos.regs[0x18]=(Bit8u)(exsize >> 8);
cmos.regs[0x30]=(Bit8u)exsize;
cmos.regs[0x31]=(Bit8u)(exsize >> 8);
}