cmos support

Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@540

src/dosbox.cpp

@@ -73,6 +73,7 @@ void PIC_Init(Section*);
 void TIMER_Init(Section*);
 void BIOS_Init(Section*);
 void DEBUG_Init(Section*);
+void CMOS_Init(Section*);
 
 /* Dos Internal mostly */
 void EMS_Init(Section*);
@@ -163,6 +164,7 @@ void DOSBOX_Init(void) {
 	secprop->AddInitFunction(&PIC_Init);
 	secprop->AddInitFunction(&PROGRAMS_Init);
 	secprop->AddInitFunction(&TIMER_Init);
+	secprop->AddInitFunction(&CMOS_Init);
 	secprop->AddInitFunction(&RENDER_Init);
 	secprop->Add_string("snapshots","snapshots");
 	

src/hardware/cmos.cpp

@@ -0,0 +1,118 @@
+/*
+ *  Copyright (C) 2002  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 Library 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 "dosbox.h"
+#include "timer.h"
+#include "pic.h"
+#include "inout.h"
+#include "config.h"
+
+static struct {
+
+	Bit8u regs[0x40];
+	bool nmi;
+	Bit8u reg;
+	struct {
+		bool enabled;
+		Bit8u div;
+		Bitu micro;
+	} timer;
+	Bit8u status_c;
+	bool ack;
+	bool update_ended;
+
+} cmos;
+
+static void cmos_timerevent(void) {
+	PIC_ActivateIRQ(8); 
+	if (cmos.ack) {
+		PIC_AddEvent(cmos_timerevent,cmos.timer.micro);
+		cmos.status_c=0x20;
+		cmos.ack=false;
+	}
+}
+
+static void cmos_checktimer(void) {
+	PIC_RemoveEvents(cmos_timerevent);	
+	if (!cmos.timer.div && !cmos.timer.enabled) return;
+	if (cmos.timer.div<=2) cmos.timer.div+=7;
+	cmos.timer.micro=(Bitu) (10000000.0/(32768.0 / (1 << (cmos.timer.div - 1))));
+	LOG_DEBUG("RTC Timer at %f hz",1000000.0/cmos.timer.micro);
+	PIC_AddEvent(cmos_timerevent,cmos.timer.micro);
+}
+
+void cmos_selreg(Bit32u port,Bit8u val) {
+	cmos.reg=val & 0x3f;
+	cmos.nmi=(val & 0x80)>0;
+}
+
+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 */
+		cmos.regs[cmos.reg]=val;
+		break;
+	case 0x0a:		/* Status reg A */
+		cmos.regs[cmos.reg]=val & 0x7f;
+		if (val & 0x70!=0x20) LOG_DEBUG("CMOS Illegal 22 stage divider value");
+		cmos.timer.div=(val & 0xf);
+		cmos_checktimer();
+		break;
+	case 0x0b:		/* Status reg B */
+		cmos.regs[cmos.reg]=val & 0x7f;
+		cmos.timer.enabled=(val & 0x40)>0;
+		if (val&0x10) LOG_DEBUG("CMOS:Updated ended interrupt not supported yet");
+		cmos_checktimer();
+		break;
+	default:
+		cmos.regs[cmos.reg]=val & 0x7f;
+		LOG_DEBUG("CMOS:Unhandled register %x",cmos.reg);
+	}
+}
+
+static Bit8u cmos_readreg(Bit32u port) {
+	if (cmos.reg>0x3f) {
+		LOG_DEBUG("CMOS:Read from illegal register %x",cmos.reg);
+		return 0xff;
+	}
+	switch (cmos.reg) {
+	case 0x0c:
+		if (cmos.ack) return 0;
+		else {
+			cmos.ack=true;
+			return 0x80|cmos.status_c;
+		}
+	default:
+		return cmos.regs[cmos.reg];
+	}
+}
+
+void CMOS_Init(Section* sec) {
+	IO_RegisterWriteHandler(0x70,cmos_selreg,"CMOS");
+	IO_RegisterWriteHandler(0x71,cmos_writereg,"CMOS");
+	IO_RegisterReadHandler(0x71,cmos_readreg,"CMOS");
+	cmos.timer.enabled=false;
+}

visualc/dosbox.dsp

@@ -335,6 +335,10 @@ SOURCE=..\src\hardware\adlib.cpp
 # End Source File
 # Begin Source File
 
+SOURCE=..\src\hardware\cmos.cpp
+# End Source File
+# Begin Source File
+
 SOURCE=..\src\hardware\dma.cpp
 # End Source File
 # Begin Source File