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aiie/apple/mouse.cpp

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#include "mouse.h"
#include <string.h>
#include "globals.h"
#include "mouse-rom.h"
enum {
SW_W_INIT = 0x00,
SW_R_HOMEMOUSE = 0x08,
SW_R_POSMOUSE = 0x09,
SW_R_CLEARMOUSE = 0x0A,
SW_R_READMOUSE = 0x0B,
SW_R_INITMOUSE = 0x0C,
SW_W_CLAMPMOUSE = 0x0D,
SW_R_SERVEMOUSE = 0x0E,
SW_W_SETMOUSE = 0x0F
};
// The first 3 soft switch bits technically should pass directly to
// the PIA6821. In practice, so far, I've only seen the first (SW_W_INIT)
// used when PR#4 is invoked to initialize the mouse interface from DOS,
// so for the moment I'll just catch that specifically.
enum {
ST_MOUSEENABLE = 1,
ST_INTMOUSE = 2,
ST_INTBUTTON = 4,
ST_INTVBL = 8
};
Mouse::Mouse()
{
status = 0;
interruptsTriggered = 0;
lastX = lastY = 0;
lastButton = false;
}
Mouse::~Mouse()
{
}
bool Mouse::Serialize(int8_t fd)
{
return true;
}
bool Mouse::Deserialize(int8_t fd)
{
return true;
}
void Mouse::Reset()
{
}
uint8_t Mouse::readSwitches(uint8_t s)
{
switch (s) {
case SW_R_HOMEMOUSE:
g_mouse->setPosition( (g_ram.readByte(0x578) << 8) | g_ram.readByte(0x478),
(g_ram.readByte(0x5F8) << 8) | g_ram.readByte(0x4F8)
);
break;
case SW_R_POSMOUSE:
g_mouse->setPosition( (g_ram.readByte(0x578+4) << 8) | g_ram.readByte(0x478+4),
(g_ram.readByte(0x5F8+4) << 8) | g_ram.readByte(0x4F8+4)
);
break;
case SW_R_CLEARMOUSE:
g_ram.writeByte(0x578+4, 0);
g_ram.writeByte(0x478+4, 0);
g_ram.writeByte(0x5F8+4, 0);
g_ram.writeByte(0x4F8+4, 0);
g_mouse->setPosition(0,0);
break;
case SW_R_READMOUSE:
{
uint16_t xpos, ypos;
g_mouse->getPosition(&xpos, &ypos);
if (lastX != xpos || lastY != ypos) {
interruptsTriggered |= 0x20; // "x or y changed since last reading"
lastX = xpos; lastY = ypos;
}
curButton = g_mouse->getButton();
uint8_t newStatus = g_ram.readByte(0x778+4) & ~0xC0;
if (curButton) { newStatus |= 0x80; };
if (lastButton) { newStatus |= 0x40; };
uint16_t xv = xpos >> 8; xv &= 0xFF;
printf("XPOS: %d => 0x%X 0x%X\n", xpos, xv, xpos & 0xFF);
g_ram.writeByte(0x578+4, xv); // high X
g_ram.writeByte(0x478+4, xpos & 0xFF); // low X
g_ram.writeByte(0x5F8+4, (ypos >> 8) & 0xFF); // high Y
g_ram.writeByte(0x4F8+4, ypos); // low Y
}
break;
case SW_R_INITMOUSE:
// Set clamp to (0,0) - (1023,1023)
g_ram.writeByte(0x578, 0); // high of lowclamp
g_ram.writeByte(0x478, 0); // low of lowclamp
g_ram.writeByte(0x5F8, 0x03); // high of highclamp
g_ram.writeByte(0x4F8, 0xFF); // low of highclamp
g_mouse->setClamp(XCLAMP, 0, 1023);
g_mouse->setClamp(YCLAMP, 0, 1023);
break;
case SW_R_SERVEMOUSE:
if (lastButton) interruptsTriggered |= 0x40;
if (curButton != lastButton) {
interruptsTriggered |= 0x80;
lastButton = curButton;
}
g_ram.writeByte(0x778+4, interruptsTriggered);
g_ram.writeByte(0x6B8+4, interruptsTriggered); // hack to appease ROM
interruptsTriggered = 0;
break;
default:
printf("mouse: unknown switch read 0x%X\n", s);
};
return 0xFF;
}
void Mouse::writeSwitches(uint8_t s, uint8_t v)
{
switch (s) {
case SW_W_INIT:
v &= 0x03; // just the low 3 bits apparently?
printf("Simple init: value is 0x%X\n", v);
status = v;
g_ram.writeByte(0x7f8 + 4, v);
break;
case SW_W_CLAMPMOUSE:
{
uint16_t lowval = (g_ram.readByte(0x578) << 8) | (g_ram.readByte(0x478));
uint16_t highval = (g_ram.readByte(0x5F8) << 8) | (g_ram.readByte(0x4F8));
if (v) {
g_mouse->setClamp(YCLAMP, lowval, highval);
} else {
// X is clamping
g_mouse->setClamp(XCLAMP, lowval, highval);
}
}
break;
case SW_W_SETMOUSE:
status = v;
g_ram.writeByte(0x7f8 + 4, v);
break;
default:
printf("mouse: unknown switch write 0x%X = 0x%2X\n", s, v);
break;
}
}
void Mouse::loadROM(uint8_t *toWhere)
{
/* Actual mouse ROM Disassembly:
C400- 2C 58 FF BIT $FF58 ; test bits in FF58 w/ A
C403- 70 1B BVS $C420 ; V will contain bit 6 from $FF58, which should be $60 on boot-up (RTS), which has $40 set, so should branch here
C405- 38 SEC
C406- 90 18 BCC $C420 ; no-op; unless called @ $C406 directly?
C408- B8 CLV ; clear overflow
C409- 50 15 BVC $C420 ; always branches
; unused... ? more lookup table... ?
C40B- 01 20 ORA ($20,X)
C40D- AE AE AE LDX $AEAE
; This is the lookup table for entry addresses
C410- AE
C411- 00
C412- 6D ;(setmouse @ c46d)
C413- 75 ;(servemouse @ C475)
C414- 8E ;(readmouse @ C48E)
C415- 9F ;(clearmouse @ C49F)
C416- A4 ;(posmouse @ C4A4)
C417- 86 ;(clampmouse @ C486)
C418- A9 ;(homemouse @ C4A9)
C419- 97 ;(initmouse @ C497)
C41A- AE
C41B- AE
C41C- AE ;(semi-documented: sets mouse frequency handler to 60 or 50 hz)
C41D- AE
C41E- AE
C41F- AE
; Main (installs KSW for IN# handling)
C420- 48 PHA ; push accumulator to stack
C421- 98 TYA
C422- 48 PHA ; push Y to stack
C423- 8A TXA
C424- 48 PHA ; push X to stack
C425- 08 PHP ; push status to stack
C426- 78 SEI ; disable interrupts
; This JSR $FF58 is a trick to get the address we're calling from. By
; default, $FF58 contains a RTS (until patched as the DOS '&' vector,
; or ProDOS does something similar). As long as this executes before
; the DOS takes over, it's safe; but if we're doing this after ProDOS
; loads, a 64k machine might have garbage after the language card RAM
; is loaded here. A safer alternative would be something like
; LDA #$60 ; Write an RTS ($60) to a temporary memory
; STA WORK ; address, and then
; JSR WORK ; jump to it
; TSX
; LDA $100, X ; grab the return address off the stack
C427- 20 58 FF JSR $FF58 ; call something that will RTS
C42A- BA TSX ; pull stack pointer to X
C42B- BD 00 01 LDA $0100,X ; grab A from the current stack pointer, which has our return addr
C42E- AA TAX ; X = return addr
C42F- 0A ASL
C430- 0A ASL
C431- 0A ASL
C432- 0A ASL
C433- A8 TAY ; Y = (return addr) << 4
C434- 28 PLP ; restore status from stack (includes V,C)
C435- 50 0F BVC $C446 ; overflow is clear from when we were called?
C437- A5 38 LDA $38 ; >> $38 is the IN# vector ("KSW") low byte
C439- D0 0D BNE $C448 ; restore stack & return
C43B- 8A TXA
C43C- 45 39 EOR $39 ; >> KSW high byte
C43E- D0 08 BNE $C448 ; restore stack & return
C440- A9 05 LDA #$05
C442- 85 38 STA $38 ; ($38) = $05
C444- D0 0B BNE $C451
;; we wind up here when the entry vector $c405 is called directly (from $9eba)
C446- B0 09 BCS $C451 ; carry set if ... ?
;; entry point when called as PR# so BASIC/DOS can init the mouse
C448- 68 PLA ; pull X from stack
C449- AA TAX
C44A- 68 PLA ; pull Y from stack, but
C44B- EA NOP ; throw it away
C44C- 68 PLA ; pull A from stack
C44D- 99 80 C0 STA $C080,Y ; LC RAM bank2, read and wr-protect
C450- 60 RTS
C451- 99 81 C0 STA $C081,Y ; LC RAM bank 2, read ROM
C454- 68 PLA ;
C455- BD 38 06 LDA $0638,X
C458- AA TAX
C459- 68 PLA
C45A- A8 TAY
C45B- 68 PLA
C45C- BD 00 02 LDA $0200,X ; keyboard character buffer?
C45F- 60 RTS
C460- 00 BRK
C461- 00 BRK
C462- 00 BRK
C463- 00 BRK
C464- 00 BRK
C465- 00 BRK
C466- 00 BRK
C467- 00 BRK
C468- 00 BRK
C469- 00 BRK
C46A- 00 BRK
C46B- 00 BRK
C46C- 00 BRK
; SetMouse
C46D- C9 10 CMP #$10 ; interrupt on VBL + interrupt on mouse move?
C46F- B0 3F BCS $C4B0 ; RTS if A >= 0x10
C471- 99 82 C0 STA $C082,Y ; LC RAM bank 2, read ROM, wr-protect RAM
C474- 60 RTS
; ServeMouse
C475- 48 PHA ; save A
C476- 18 CLC
C477- 90 39 BCC $C4B2 ; always branches
; ServeMouse cleanup and exit
C479- 99 83 C0 STA $C083,Y ; LC RAM bank 2, read RAM
C47C- BD B8 06 LDA $06B8,X ; apparently this is where the new status wound up, also $7f8 + <slot#>
C47F- 29 0E AND #$0E
C481- D0 01 BNE $C484 ; if the interrupt bits don't show it was a mouse interrupt, set error (C) before returning
C483- 38 SEC
C484- 68 PLA ; restore A
C485- 60 RTS
; ClampMouse
C486- C9 02 CMP #$02
C488- B0 26 BCS $C4B0 ; RTS if 2 <= the A register
C48A- 99 83 C0 STA $C083,Y ; LC RAM bank 2, read RAM
C48D- 60 RTS
; ReadMouse
C48E- A9 04 LDA #$04
C490- 99 83 C0 STA $C083,Y ; LC RAM bank 2, read RAM
C493- 18 CLC
C494- EA NOP
C495- EA NOP
C496- 60 RTS
; InitMouse
C497- EA NOP
C498- A9 02 LDA #$02
C49A- 99 83 C0 STA $C083,Y ; LC RAM bank 2, read RAM
C49D- 18 CLC
C49E- 60 RTS
; ClearMouse
C49F- EA NOP
C4A0- A9 05 LDA #$05
C4A2- D0 F6 BNE $C49A
; PosMouse
C4A4- EA NOP
C4A5- A9 06 LDA #$06
C4A7- D0 F1 BNE $C49A
; HomeMouse
C4A9- EA NOP
C4AA- A9 07 LDA #$07
C4AC- D0 EC BNE $C49A
; "TimeData" to set freq before init to 50/60 Hz? Doesn't look like it...
C4AE- A2 03 LDX #$03
C4B0- 38 SEC
C4B1- 60 RTS
; ServeMouse main worker
C4B2- 08 PHP
C4B3- A5 00 LDA $00
C4B5- 48 PHA
C4B6- A9 60 LDA #$60
C4B8- 85 00 STA $00
C4BA- 78 SEI
C4BB- 20 00 00 JSR $0000
C4BE- BA TSX
C4BF- 68 PLA
C4C0- 85 00 STA $00
C4C2- BD 00 01 LDA $0100,X
C4C5- 28 PLP
C4C6- AA TAX
C4C7- 0A ASL
C4C8- 0A ASL
C4C9- 0A ASL
C4CA- 0A ASL
C4CB- A8 TAY
C4CC- A9 03 LDA #$03
C4CE- 18 CLC
C4CF- 90 A8 BCC $C479 ; always branches
... but the version below is patched so it uses soft switches to call
back here.
SETMOUSE:
C471- 8D CF C0 STA $C0CF ; use soft switch 0xF to handle it
60 RTS
Patch: C471 from 99 82 C0 60 => 8D CF C0 60
SERVEMOUSE @ $C4B2:
78 SEI
AD CE C0 LDA $C0CE ; use soft switch 0xE (read) to trigger this - expect new value to be placed in $7f8+4 and $6b8+4
A2 04 LDX #$04 ; our slot number, for cleanup code
18 CLC
90 C1 BCC $C47C
Patch: C4B2 from 08 A5 00 48 A9 60 85 00 78 =>
78 AD CE C0 A2 04 18 90 C1
READMOUSE
C48E- AD CB C0 LDA $C0CB ; soft switch 0x0B for readmouse
18 CLC
60 RTS
Patch: from A9 04 99 83 C0 =>
AD CB C0 18 60
CLEARMOUSE
C49F- AD CA C0 LDA $C0CA ; soft switch 0x0A for clearmouse
18 CLC
60 RTS
Patch: from EA A9 05 D0 F6 =>
AD CA C0 18 60
POSMOUSE
C4a4- AD C9 C0 LDA $C0C9 ; soft switch 0x09 for posmouse
18 CLC
60 RTS
Patch: from EA A9 06 D0 F1 =>
AD C9 C0 18 60
CLAMPMOUSE
C48A- 8D CD C0 STA $C0CD ; use write to soft switch 0x0D to trigger clamp
60 RTS
Patch: from 99 83 C0 60 => 8D CD C0 60
HOMEMOUSE
C4A9- AD C8 C0 LDA $c0C8 ; soft switch 0x08 for homemouse (read)
18 CLC
60 RTS
Patch: from EA A9 07 D0 EC => AD C8 C0 18 60
INITMOUSE
C498- AD CC C0 LDA $C0CC ; soft switch 0x0C read for initmouse
18 CLC
60 RTS
Patch: from A9 02 99 83 C0 => AD CC C0 18 60
*/
uint8_t rom[256] = { 0x2c, 0x58, 0xff, 0x70, 0x1B, 0x38, 0x90, 0x18, // C400
0xb8, 0x50, 0x15, 0x01, 0x20, 0xae, 0xae, 0xae,
0xae, 0x00, 0x6d, 0x75, 0x8e, 0x9f, 0xa4, 0x86, // C410
0xa9, 0x97, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae,
0x48, 0x98, 0x48, 0x8a, 0x48, 0x08, 0x78, 0x20, // C420
0x58, 0xFF, 0xBA, 0xBD, 0x00, 0x01, 0xAA, 0x0A,
0x0A, 0x0A, 0x0A, 0xA8, 0x28, 0x50, 0x0F, 0xA5, // C430
0x38, 0xd0, 0x0d, 0x8a, 0x45, 0x39, 0xd0, 0x08,
0xa9, 0x05, 0x85, 0x38, 0xd0, 0x0b, 0xb0, 0x09, // C440
0x68, 0xaa, 0x68, 0xea, 0x68, 0xea, 0xea, 0xea,
0x60, 0x99, 0x81, 0xc0, 0x68, 0xbd, 0x38, 0x06, // C450
0xaa, 0x68, 0xa8, 0x68, 0xbd, 0x00, 0x02, 0x60,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // C460
0x00, 0x00, 0x00, 0x00, 0x00, 0xc9, 0x10, 0xb0,
0x3f, 0x8D, 0xCF, 0xc0, 0x60, 0x48, 0x18, 0x90, // C470
0x39, 0x99, 0x83, 0xc0, 0xbd, 0xb8, 0x06, 0x29,
0x0E, 0xD0, 0x01, 0x38, 0x68, 0x60, 0xc9, 0x02, // C480
0xb0, 0x26, 0x8D, 0xCD, 0xc0, 0x60, 0xAD, 0xCB,
0xC0, 0x18, 0x60, 0x18, 0xea, 0xea, 0x60, 0xea, // C490
0xAD, 0xCC, 0xC0, 0x18, 0x60, 0x18, 0x60, 0xAD,
0xCA, 0xC0, 0x18, 0x60, 0xAD, 0xC9, 0xc0, 0x18, // C4A0
0x60, 0xAD, 0xC8, 0xC0, 0x18, 0x60, 0xa2, 0x03,
0x38, 0x60, 0x78, 0xad, 0xce, 0xc0, 0xa2, 0x04, // C4B0
0x18, 0x90, 0xc1, 0x20, 0x00, 0x00, 0xba, 0x68,
0x85, 0x00, 0xbd, 0x00, 0x01, 0x28, 0xaa, 0x0a, // C4C0
0x0a, 0x0a, 0x0a, 0xa8, 0xa9, 0x03, 0x18, 0x90,
0xa8, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, // C4D0
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, // C4E0
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, // C4F0
0xff, 0xff, 0xff, 0xd6, 0xff, 0xff, 0xff, 0x01 };
memcpy(toWhere, rom, 256);
}
bool Mouse::hasExtendedRom()
{
return true;
}
void Mouse::loadExtendedRom(uint8_t *toWhere, uint16_t byteOffset)
{
#if 0
printf("loading extended rom for the mouse\n");
for (int i=0; i<256; i++) {
toWhere[i] = romData[i + byteOffset];
}
#endif
}
void Mouse::maintainMouse(int64_t cycleCount)
{
// static int64_t startTime = cycleCount;
// Fake a 60Hz VBL in case we need it for our interrupts
static int64_t nextInterruptTime = cycleCount + 17050;
if ( (status & ST_MOUSEENABLE) &&
(status & ST_INTVBL) &&
(cycleCount >= nextInterruptTime) ) {
g_cpu->irq();
interruptsTriggered |= ST_INTVBL;
nextInterruptTime += 17050;
} else {
uint16_t xpos, ypos;
g_mouse->getPosition(&xpos, &ypos);
if ( (status & ST_MOUSEENABLE) &&
(status & ST_INTMOUSE) &&
(xpos != lastX || ypos != lastY) ) {
g_cpu->irq();
interruptsTriggered |= ST_INTMOUSE;
lastX = xpos; lastY = ypos;
}
}
/* FIXME: still need button */
}
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