MCUME/MCUME_teensy41/teensyuae/cia.c

803 wiersze
18 KiB
C

/*
* UAE - The Un*x Amiga Emulator
*
* CIA chip support
*
* Copyright 1995 Bernd Schmidt, Alessandro Bissacco
* Copyright 1996, 1997 Stefan Reinauer, Christian Schmitt
*/
#include "shared.h"
#include <assert.h>
#include "gensound.h"
#include "sounddep/sound.h"
#include "events.h"
#include "memory.h"
#include "custom.h"
#include "cia.h"
#include "serial.h"
#include "disk.h"
#include "xwin.h"
#include "keybuf.h"
#include "gui.h"
#define DIV10 5 /* Yes, a bad identifier. */
/* battclock stuff */
#define RTC_D_ADJ 8
#define RTC_D_IRQ 4
#define RTC_D_BUSY 2
#define RTC_D_HOLD 1
#define RTC_E_t1 8
#define RTC_E_t0 4
#define RTC_E_INTR 2
#define RTC_E_MASK 1
#define RTC_F_TEST 8
#define RTC_F_24_12 4
#define RTC_F_STOP 2
#define RTC_F_RSET 1
static unsigned int clock_control_d = RTC_D_ADJ + RTC_D_HOLD;
static unsigned int clock_control_e = 0;
static unsigned int clock_control_f = RTC_F_24_12;
unsigned int ciaaicr,ciaaimask,ciabicr,ciabimask;
unsigned int ciaacra,ciaacrb,ciabcra,ciabcrb;
unsigned long ciaata,ciaatb,ciabta,ciabtb;
unsigned long ciaatod,ciabtod,ciaatol,ciabtol,ciaaalarm,ciabalarm;
int ciaatlatch,ciabtlatch;
static unsigned long ciaala,ciaalb,ciabla,ciablb;
static int ciaatodon, ciabtodon;
static unsigned int ciaapra,ciaaprb,ciaadra,ciaadrb,ciaasdr;
static unsigned int ciabpra,ciabprb,ciabdra,ciabdrb,ciabsdr;
static int div10;
static int kbstate, kback, ciaasdr_unread = 0;
//static int prtopen;
//static FILE *prttmp;
static void setclr(unsigned int *p, unsigned int val)
{
if (val & 0x80) {
*p |= val & 0x7F;
} else {
*p &= ~val;
}
}
static void RethinkICRA(void)
{
if (ciaaimask & ciaaicr) {
ciaaicr |= 0x80;
custom_bank.wput(0xDFF09C,0x8008);
} else {
ciaaicr &= 0x7F;
/* custom_bank.wput(0xDFF09C,0x0008);*/
}
}
static void RethinkICRB(void)
{
#if 0 /* ??? What's this then? */
if (ciabicr & 0x10) {
custom_bank.wput(0xDFF09C,0x9000);
}
#endif
if (ciabimask & ciabicr) {
ciabicr |= 0x80;
custom_bank.wput(0xDFF09C,0xA000);
} else {
ciabicr &= 0x7F;
/* custom_bank.wput(0xDFF09C,0x2000);*/
}
}
static int lastdiv10;
static void CIA_update(void)
{
unsigned long int ccount = cycles - eventtab[ev_cia].oldcycles + lastdiv10;
unsigned long int ciaclocks = ccount / DIV10;
int aovfla = 0, aovflb = 0, bovfla = 0, bovflb = 0;
lastdiv10 = div10;
div10 = ccount % DIV10;
/* CIA A timers */
if ((ciaacra & 0x21) == 0x01) {
assert((ciaata+1) >= ciaclocks);
if ((ciaata+1) == ciaclocks) {
aovfla = 1;
if ((ciaacrb & 0x61) == 0x41) {
if (ciaatb-- == 0) aovflb = 1;
}
}
ciaata -= ciaclocks;
}
if ((ciaacrb & 0x61) == 0x01) {
assert((ciaatb+1) >= ciaclocks);
if ((ciaatb+1) == ciaclocks) aovflb = 1;
ciaatb -= ciaclocks;
}
/* CIA B timers */
if ((ciabcra & 0x21) == 0x01) {
assert((ciabta+1) >= ciaclocks);
if ((ciabta+1) == ciaclocks) {
bovfla = 1;
if ((ciabcrb & 0x61) == 0x41) {
if (ciabtb-- == 0) bovflb = 1;
}
}
ciabta -= ciaclocks;
}
if ((ciabcrb & 0x61) == 0x01) {
assert ((ciabtb+1) >= ciaclocks);
if ((ciabtb+1) == ciaclocks) bovflb = 1;
ciabtb -= ciaclocks;
}
if (aovfla) {
ciaaicr |= 1; RethinkICRA();
ciaata = ciaala;
if (ciaacra & 0x8) ciaacra &= ~1;
}
if (aovflb) {
ciaaicr |= 2; RethinkICRA();
ciaatb = ciaalb;
if (ciaacrb & 0x8) ciaacrb &= ~1;
}
if (bovfla) {
ciabicr |= 1; RethinkICRB();
ciabta = ciabla;
if (ciabcra & 0x8) ciabcra &= ~1;
}
if (bovflb) {
ciabicr |= 2; RethinkICRB();
ciabtb = ciablb;
if (ciabcrb & 0x8) ciabcrb &= ~1;
}
}
static void CIA_calctimers(void)
{
int ciaatimea = -1, ciaatimeb = -1, ciabtimea = -1, ciabtimeb = -1;
eventtab[ev_cia].oldcycles = cycles;
if ((ciaacra & 0x21) == 0x01) {
ciaatimea = (DIV10-div10) + DIV10*ciaata;
}
if ((ciaacrb & 0x61) == 0x41) {
/* Timer B will not get any pulses if Timer A is off. */
if (ciaatimea >= 0) {
/* If Timer A is in one-shot mode, and Timer B needs more than
* one pulse, it will not underflow. */
if (ciaatb == 0 || (ciaacra & 0x8) == 0) {
/* Otherwise, we can determine the time of the underflow. */
ciaatimeb = ciaatimea + ciaala * DIV10 * ciaatb;
}
}
}
if ((ciaacrb & 0x61) == 0x01) {
ciaatimeb = (DIV10-div10) + DIV10*ciaatb;
}
if ((ciabcra & 0x21) == 0x01) {
ciabtimea = (DIV10-div10) + DIV10*ciabta;
}
if ((ciabcrb & 0x61) == 0x41) {
/* Timer B will not get any pulses if Timer A is off. */
if (ciabtimea >= 0) {
/* If Timer A is in one-shot mode, and Timer B needs more than
* one pulse, it will not underflow. */
if (ciabtb == 0 || (ciabcra & 0x8) == 0) {
/* Otherwise, we can determine the time of the underflow. */
ciabtimeb = ciabtimea + ciabla * DIV10 * ciabtb;
}
}
}
if ((ciabcrb & 0x61) == 0x01) {
ciabtimeb = (DIV10-div10) + DIV10*ciabtb;
}
eventtab[ev_cia].active = (ciaatimea != -1 || ciaatimeb != -1
|| ciabtimea != -1 || ciabtimeb != -1);
if (eventtab[ev_cia].active) {
unsigned long int ciatime = ~0L;
if (ciaatimea != -1) ciatime = ciaatimea;
if (ciaatimeb != -1 && ciaatimeb < ciatime) ciatime = ciaatimeb;
if (ciabtimea != -1 && ciabtimea < ciatime) ciatime = ciabtimea;
if (ciabtimeb != -1 && ciabtimeb < ciatime) ciatime = ciabtimeb;
eventtab[ev_cia].evtime = ciatime + cycles;
}
events_schedule();
}
void CIA_handler(void)
{
CIA_update();
CIA_calctimers();
}
void diskindex_handler(void)
{
//emu_printf("diskhand");
eventtab[ev_diskindex].evtime += cycles - eventtab[ev_diskindex].oldcycles;
eventtab[ev_diskindex].oldcycles = cycles;
ciabicr |= 0x10;
RethinkICRB();
}
void CIA_hsync_handler(void)
{
static unsigned int keytime = 0, sleepyhead = 0;
if (ciabtodon)
ciabtod++;
ciabtod &= 0xFFFFFF;
if (ciabtod == ciabalarm) {
ciabicr |= 4; RethinkICRB();
}
SERDATS(); /* check if the serial Port gets some data */
if (keys_available() && kback && (++keytime & 15) == 0) {
/*
* This hack lets one possible ciaaicr cycle go by without any key
* being read, for every cycle in which a key is pulled out of the
* queue. If no hack is used, a lot of key events just get lost
* when you type fast. With a simple hack that waits for ciaasdr
* to be read before feeding it another, it will keep up until the
* queue gets about 14 characters ahead and then lose events, and
* the mouse pointer will freeze while typing is being taken in.
* With this hack, you can type 30 or 40 characters ahead with little
* or no lossage, and the mouse doesn't get stuck. The tradeoff is
* that the total slowness of typing appearing on screen is worse.
*/
if (ciaasdr_unread == 2)
ciaasdr_unread = 0;
else if (ciaasdr_unread == 0) {
switch (kbstate) {
case 0:
ciaasdr = (uae_s8)~0xFB; /* aaarghh... stupid compiler */
kbstate++;
break;
case 1:
kbstate++;
ciaasdr = (uae_s8)~0xFD;
break;
case 2:
ciaasdr = ~get_next_key();
ciaasdr_unread = 1; /* interlock to prevent lost keystrokes */
break;
}
ciaaicr |= 8;
RethinkICRA();
sleepyhead = 0;
} else if (!(++sleepyhead & 15))
ciaasdr_unread = 0; /* give up on this key event after unread for a long time */
}
}
void CIA_vsync_handler()
{
if (ciaatodon)
ciaatod++;
ciaatod &= 0xFFFFFF;
if (ciaatod == ciaaalarm) {
ciaaicr |= 4; RethinkICRA();
}
}
static uae_u8 ReadCIAA(unsigned int addr)
{
unsigned int tmp;
switch(addr & 0xf){
case 0:
tmp = (DISK_status() & 0x3C);
if ((JSEM_ISMOUSE (0, currprefs.fake_joystick) && !buttonstate[0])
|| (!JSEM_ISMOUSE (0, currprefs.fake_joystick) && !(joy0button & 1)))
tmp |= 0x40;
if (!(joy1button & 1))
tmp |= 0x80;
return tmp;
case 1:
return ciaaprb;
case 2:
return ciaadra;
case 3:
return ciaadrb;
case 4:
return ciaata & 0xff;
case 5:
return ciaata >> 8;
case 6:
return ciaatb & 0xff;
case 7:
return ciaatb >> 8;
case 8:
if (ciaatlatch) {
ciaatlatch = 0;
return ciaatol & 0xff;
} else
return ciaatod & 0xff;
case 9:
if (ciaatlatch)
return (ciaatol >> 8) & 0xff;
else
return (ciaatod >> 8) & 0xff;
case 10:
ciaatlatch = 1;
ciaatol = ciaatod; /* ??? only if not already latched? */
return (ciaatol >> 16) & 0xff;
case 12:
if (ciaasdr == 1) ciaasdr_unread = 2;
return ciaasdr;
case 13:
tmp = ciaaicr; ciaaicr = 0; RethinkICRA(); return tmp;
case 14:
return ciaacra;
case 15:
return ciaacrb;
}
return 0;
}
static uae_u8 ReadCIAB(unsigned int addr)
{
unsigned int tmp;
switch(addr & 0xf){
case 0:
return ciabpra;
case 1:
return ciabprb;
case 2:
return ciabdra;
case 3:
return ciabdrb;
case 4:
return ciabta & 0xff;
case 5:
return ciabta >> 8;
case 6:
return ciabtb & 0xff;
case 7:
return ciabtb >> 8;
case 8:
if (ciabtlatch) {
ciabtlatch = 0;
return ciabtol & 0xff;
} else
return ciabtod & 0xff;
case 9:
if (ciabtlatch)
return (ciabtol >> 8) & 0xff;
else
return (ciabtod >> 8) & 0xff;
case 10:
ciabtlatch = 1;
ciabtol = ciabtod;
return (ciabtol >> 16) & 0xff;
case 12:
return ciabsdr;
case 13:
tmp = ciabicr; ciabicr = 0; RethinkICRB();
return tmp;
case 14:
return ciabcra;
case 15:
return ciabcrb;
}
return 0;
}
static void WriteCIAA(uae_u16 addr,uae_u8 val)
{
int oldled, oldovl;
switch(addr & 0xf){
case 0:
oldovl = ciaapra & 1;
oldled = ciaapra & 2;
ciaapra = (ciaapra & ~0x3) | (val & 0x3); LED(ciaapra & 0x2);
if ((ciaapra & 2) != oldled)
gui_led (0, !(ciaapra & 2));
if ((ciaapra & 1) != oldovl) {
map_banks(oldovl ? &chipmem_bank : &kickmem_bank, 0, 32);
}
break;
case 1:
ciaaprb = val;
/*
if (prtopen==1) {
#ifndef __DOS__
fprintf (prttmp,"%c",val);
#else
fputc (val, prttmp);
fflush (prttmp);
#endif
if (val==0x04) {
#if defined(__unix) && !defined(__BEOS__) && !defined(__DOS__)
pclose (prttmp);
#else
fclose (prttmp);
#endif
prtopen = 0;
}
} else {
#if defined(__unix) && !defined(__BEOS__) && !defined(__DOS__)
prttmp=(FILE *)popen ((char *)prtname,"w");
#else
prttmp=(FILE *)fopen ((char *)prtname,"wb");
#endif
if (prttmp != NULL) {
prtopen = 1;
#ifndef __DOS__
fprintf (prttmp,"%c",val);
#else
fputc (val, prttmp);
fflush (prttmp);
#endif
}
}
*/
ciaaicr |= 0x10;
break;
case 2:
ciaadra = val; break;
case 3:
ciaadrb = val; break;
case 4:
CIA_update();
ciaala = (ciaala & 0xff00) | val;
CIA_calctimers();
break;
case 5:
CIA_update();
ciaala = (ciaala & 0xff) | (val << 8);
if ((ciaacra & 1) == 0)
ciaata = ciaala;
if (ciaacra & 8) {
ciaata = ciaala;
ciaacra |= 1;
}
CIA_calctimers();
break;
case 6:
CIA_update();
ciaalb = (ciaalb & 0xff00) | val;
CIA_calctimers();
break;
case 7:
CIA_update();
ciaalb = (ciaalb & 0xff) | (val << 8);
if ((ciaacrb & 1) == 0)
ciaatb = ciaalb;
if (ciaacrb & 8) {
ciaatb = ciaalb;
ciaacrb |= 1;
}
CIA_calctimers();
break;
case 8:
if (ciaacrb & 0x80){
ciaaalarm = (ciaaalarm & ~0xff) | val;
} else {
ciaatod = (ciaatod & ~0xff) | val;
ciaatodon = 1;
}
break;
case 9:
if (ciaacrb & 0x80){
ciaaalarm = (ciaaalarm & ~0xff00) | (val << 8);
} else {
ciaatod = (ciaatod & ~0xff00) | (val << 8);
ciaatodon = 0;
}
break;
case 10:
if (ciaacrb & 0x80){
ciaaalarm = (ciaaalarm & ~0xff0000) | (val << 16);
} else {
ciaatod = (ciaatod & ~0xff0000) | (val << 16);
ciaatodon = 0;
}
break;
case 12:
ciaasdr = val; break;
case 13:
setclr(&ciaaimask,val); break; /* ??? call RethinkICR() ? */
case 14:
CIA_update();
ciaacra = val;
if (ciaacra & 0x10){
ciaacra &= ~0x10;
ciaata = ciaala;
}
if (ciaacra & 0x40) {
kback = 1;
}
CIA_calctimers();
break;
case 15:
CIA_update();
ciaacrb = val;
if (ciaacrb & 0x10){
ciaacrb &= ~0x10;
ciaatb = ciaalb;
}
CIA_calctimers();
break;
}
}
static void WriteCIAB(uae_u16 addr,uae_u8 val)
{
int remember;
switch(addr & 0xf){
case 0:
remember=ciabpra;
ciabpra = val;
ciabpra |= 0x80;
if (((remember&0x40)==0x40) && ((ciabpra&0x40)==0x00))
emu_printf ("RTS cleared.\n");
if (((remember&0x40)==0x00) && ((ciabpra&0x40)==0x40))
emu_printf ("RTS set.\n");
if (((remember&0x10)==0x10) && ((ciabpra&0x10)==0x00))
emu_printf ("CTS cleared.\n");
if (((remember&0x10)==0x00) && ((ciabpra&0x10)==0x10))
emu_printf ("CTS set.\n");
break;
case 1:
ciabprb = val; DISK_select(val); break;
case 2:
ciabdra = val; break;
case 3:
ciabdrb = val; break;
case 4:
CIA_update();
ciabla = (ciabla & 0xff00) | val;
CIA_calctimers();
break;
case 5:
CIA_update();
ciabla = (ciabla & 0xff) | (val << 8);
if ((ciabcra & 1) == 0)
ciabta = ciabla;
if (ciabcra & 8) {
ciabta = ciabla;
ciabcra |= 1;
}
CIA_calctimers();
break;
case 6:
CIA_update();
ciablb = (ciablb & 0xff00) | val;
CIA_calctimers();
break;
case 7:
CIA_update();
ciablb = (ciablb & 0xff) | (val << 8);
if ((ciabcrb & 1) == 0)
ciabtb = ciablb;
if (ciabcrb & 8) {
ciabtb = ciablb;
ciabcrb |= 1;
}
CIA_calctimers();
break;
case 8:
if (ciabcrb & 0x80){
ciabalarm = (ciabalarm & ~0xff) | val;
} else {
ciabtod = (ciabtod & ~0xff) | val;
ciabtodon = 1;
}
break;
case 9:
if (ciabcrb & 0x80){
ciabalarm = (ciabalarm & ~0xff00) | (val << 8);
} else {
ciabtod = (ciabtod & ~0xff00) | (val << 8);
ciabtodon = 0;
}
break;
case 10:
if (ciabcrb & 0x80){
ciabalarm = (ciabalarm & ~0xff0000) | (val << 16);
} else {
ciabtod = (ciabtod & ~0xff0000) | (val << 16);
ciabtodon = 0;
}
break;
case 12:
ciabsdr = val;
break;
case 13:
setclr(&ciabimask,val);
break;
case 14:
CIA_update();
ciabcra = val;
if (ciabcra & 0x10){
ciabcra &= ~0x10;
ciabta = ciabla;
}
CIA_calctimers();
break;
case 15:
CIA_update();
ciabcrb = val;
if (ciabcrb & 0x10){
ciabcrb &= ~0x10;
ciabtb = ciablb;
}
CIA_calctimers();
break;
}
}
uae_u8 CIA_shakehands_get(void)
{
return ciabpra;
}
void CIA_shakehands_set(uae_u8 mask)
{
ciabpra |= mask;
}
void CIA_shakehands_clear(uae_u8 mask)
{
ciabpra &= ~mask;
}
void CIA_reset(void)
{
kback = 1;
kbstate = 0;
ciaatlatch = ciabtlatch = 0;
ciaapra = 2;
ciaatod = ciabtod = 0; ciaatodon = ciabtodon = 0;
ciaaicr = ciabicr = ciaaimask = ciabimask = 0;
ciaacra = ciaacrb = ciabcra = ciabcrb = 0x4; /* outmode = toggle; */
ciaala = ciaalb = ciabla = ciablb = ciaata = ciaatb = ciabta = ciabtb = 0xFFFF;
div10 = 0;
lastdiv10 = 0;
CIA_calctimers();
ciabpra = 0x8C;
/*fprintf (stderr," CIA-Reset\n ");*/
}
/* CIA memory access */
static uae_u32 cia_lget(uaecptr) REGPARAM;
static uae_u32 cia_wget(uaecptr) REGPARAM;
static uae_u32 cia_bget(uaecptr) REGPARAM;
static void cia_lput(uaecptr, uae_u32) REGPARAM;
static void cia_wput(uaecptr, uae_u32) REGPARAM;
static void cia_bput(uaecptr, uae_u32) REGPARAM;
addrbank cia_bank = {
cia_lget, cia_wget, cia_bget,
cia_lput, cia_wput, cia_bput,
default_xlate, default_check
};
uae_u32 REGPARAM2 cia_lget(uaecptr addr)
{
return cia_bget(addr+3);
}
uae_u32 REGPARAM2 cia_wget(uaecptr addr)
{
return cia_bget(addr+1);
}
uae_u32 REGPARAM2 cia_bget(uaecptr addr)
{
if ((addr & 0x3001) == 0x2001)
return ReadCIAA((addr & 0xF00) >> 8);
if ((addr & 0x3001) == 0x1000)
return ReadCIAB((addr & 0xF00) >> 8);
return 0;
}
void REGPARAM2 cia_lput(uaecptr addr, uae_u32 value)
{
cia_bput(addr+3,value); /* FIXME ? */
}
void REGPARAM2 cia_wput(uaecptr addr, uae_u32 value)
{
cia_bput(addr+1,value);
}
void REGPARAM2 cia_bput(uaecptr addr, uae_u32 value)
{
if ((addr & 0x3001) == 0x2001)
WriteCIAA((addr & 0xF00) >> 8,value);
if ((addr & 0x3001) == 0x1000)
WriteCIAB((addr & 0xF00) >> 8,value);
}
/* battclock memory access */
static uae_u32 clock_lget(uaecptr) REGPARAM;
static uae_u32 clock_wget(uaecptr) REGPARAM;
static uae_u32 clock_bget(uaecptr) REGPARAM;
static void clock_lput(uaecptr, uae_u32) REGPARAM;
static void clock_wput(uaecptr, uae_u32) REGPARAM;
static void clock_bput(uaecptr, uae_u32) REGPARAM;
addrbank clock_bank = {
clock_lget, clock_wget, clock_bget,
clock_lput, clock_wput, clock_bput,
default_xlate, default_check
};
uae_u32 REGPARAM2 clock_lget(uaecptr addr)
{
return clock_bget(addr+3);
}
uae_u32 REGPARAM2 clock_wget(uaecptr addr)
{
return clock_bget(addr+1);
}
uae_u32 REGPARAM2 clock_bget(uaecptr addr)
{
time_t t=time(0);
struct tm *ct;
ct=localtime(&t);
switch (addr & 0x3f)
{
case 0x03: return ct->tm_sec % 10;
case 0x07: return ct->tm_sec / 10;
case 0x0b: return ct->tm_min % 10;
case 0x0f: return ct->tm_min / 10;
case 0x13: return ct->tm_hour % 10;
case 0x17: return ct->tm_hour / 10;
case 0x1b: return ct->tm_mday % 10;
case 0x1f: return ct->tm_mday / 10;
case 0x23: return (ct->tm_mon+1) % 10;
case 0x27: return (ct->tm_mon+1) / 10;
case 0x2b: return ct->tm_year % 10;
case 0x2f: return ct->tm_year / 10;
case 0x33: return ct->tm_wday; /*Hack by -=SR=- */
case 0x37: return clock_control_d;
case 0x3b: return clock_control_e;
case 0x3f: return clock_control_f;
}
return 0;
}
void REGPARAM2 clock_lput(uaecptr addr, uae_u32 value)
{
/* No way */
}
void REGPARAM2 clock_wput(uaecptr addr, uae_u32 value)
{
/* No way */
}
void REGPARAM2 clock_bput(uaecptr addr, uae_u32 value)
{
switch (addr & 0x3f)
{
case 0x37: clock_control_d=value; break;
case 0x3b: clock_control_e=value; break;
case 0x3f: clock_control_f=value; break;
}
}