RaySollium99/picodrive
1
0
Fork 0
mirror of https://github.com/RaySollium99/picodrive.git synced 2025-09-05 15:27:46 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

core, revisit Sega 8 bit hardware handling

Browse source
This commit is contained in:
kub 2023-02-22 23:22:45 +00:00
parent cab84f29e5
commit 0aa63fce12
9 changed files with 63 additions and 58 deletions
Download patch file Download diff file Expand all files Collapse all files

8
pico/cart.c
View file

@ -847,7 +847,7 @@ int PicoCartInsert(unsigned char *rom, unsigned int romsize, const char *carthw_
}
pdb_cleanup();
PicoIn.AHW &= PAHW_MCD|PAHW_SMS|PAHW_PICO;
PicoIn.AHW &= ~(PAHW_32X|PAHW_SVP);
PicoCartMemSetup = NULL;
PicoDmaHook = NULL;
@ -866,7 +866,7 @@ int PicoCartInsert(unsigned char *rom, unsigned int romsize, const char *carthw_
PicoInitPico();
// setup correct memory map for loaded ROM
switch (PicoIn.AHW) {
switch (PicoIn.AHW & ~(PAHW_GG|PAHW_SG|PAHW_SC)) {
default:
elprintf(EL_STATUS|EL_ANOMALY, "starting in unknown hw configuration: %x", PicoIn.AHW);
case 0:
@ -1353,7 +1353,7 @@ static void PicoCartDetect(const char *carthw_cfg)
for (i = 0; i < Pico.romsize; i += 4) {
unsigned v = CPU_BE2(*(u32 *) (Pico.rom + i));
if (a && v == a + 0x400) { // patch if 2 pointers with offset 0x400 are found
printf("auto-patching @%06x: %08x->%08x\n", i, v, v - 0x100);
elprintf(EL_STATUS, "auto-patching @%06x: %08x->%08x\n", i, v, v - 0x100);
*(u32 *) (Pico.rom + i) = CPU_BE2(v - 0x100);
}
// detect a pointer into the incriminating area
@ -1374,7 +1374,7 @@ static void PicoCartDetect(const char *carthw_cfg)
for (i = 0; i < Pico.romsize; i += 4) {
unsigned v = CPU_BE2(*(u32 *) (Pico.rom + i));
if (a == 0xffffff8c && v == 0x5ee1) { // patch if 4-long xfer written to CHCR
printf("auto-patching @%06x: %08x->%08x\n", i, v, v & ~0x800);
elprintf(EL_STATUS, "auto-patching @%06x: %08x->%08x\n", i, v, v & ~0x800);
*(u32 *) (Pico.rom + i) = CPU_BE2(v & ~0x800); // change to half-sized xfer
}
a = v;

4
pico/draw.c
View file

@ -1647,7 +1647,7 @@ void FinalizeLine555(int sh, int line, struct PicoEState *est)
PicoDrawUpdateHighPal();
len = 256;
if ((PicoIn.AHW & PAHW_SMS) && (Pico.m.hardware & (PMS_HW_GG|PMS_HW_LCD)) == (PMS_HW_GG|PMS_HW_LCD))
if ((PicoIn.AHW & PAHW_GG) && (Pico.m.hardware & PMS_HW_LCD))
len = 160;
else if (!(PicoIn.AHW & PAHW_SMS) && (Pico.video.reg[12]&1))
len = 320;
@ -1711,7 +1711,7 @@ void FinalizeLine8bit(int sh, int line, struct PicoEState *est)
}
len = 256;
if ((PicoIn.AHW & PAHW_SMS) && (Pico.m.hardware & (PMS_HW_GG|PMS_HW_LCD)) == (PMS_HW_GG|PMS_HW_LCD))
if ((PicoIn.AHW & PAHW_GG) && (Pico.m.hardware & PMS_HW_LCD))
len = 160;
else if (!(PicoIn.AHW & PAHW_SMS) && (Pico.video.reg[12]&1))
len = 320;

18
pico/media.c
View file

@ -345,12 +345,6 @@ enum media_type_e PicoLoadMedia(const char *filename,
do_region_override(filename);
}
if (PicoCartInsert(rom_data, rom_size, carthw_cfg_fname)) {
media_type = PM_ERROR;
goto out;
}
rom_data = NULL; // now belongs to PicoCart
// simple test for GG. Do this here since m.hardware is nulled in Insert
if ((PicoIn.AHW & PAHW_SMS) && !PicoIn.hwSelect) {
const char *ext = NULL;
@ -363,18 +357,24 @@ enum media_type_e PicoLoadMedia(const char *filename,
}
}
if (ext && !strcmp(ext,"gg") && !PicoIn.hwSelect) {
Pico.m.hardware |= PMS_HW_GG;
PicoIn.AHW |= PAHW_GG;
lprintf("detected GG ROM\n");
} else if (ext && !strcmp(ext,"sg")) {
Pico.m.hardware |= PMS_HW_SG;
PicoIn.AHW |= PAHW_SG;
lprintf("detected SG-1000 ROM\n");
} else if (ext && !strcmp(ext,"sc")) {
Pico.m.hardware |= PMS_HW_SC;
PicoIn.AHW |= PAHW_SC;
lprintf("detected SC-3000 ROM\n");
} else
lprintf("detected SMS ROM\n");
}
if (PicoCartInsert(rom_data, rom_size, carthw_cfg_fname)) {
media_type = PM_ERROR;
goto out;
}
rom_data = NULL; // now belongs to PicoCart
// insert CD if it was detected
Pico.m.ncart_in = 0;
if (cd_img_type != CT_UNKNOWN) {

18
pico/mode4.c
View file

@ -162,7 +162,7 @@ static void ParseSpritesM4(int scanline)
if (pv->reg[0] & 8)
xoff -= 8; // sprite shift
if ((Pico.m.hardware & (PMS_HW_GG|PMS_HW_LCD)) == (PMS_HW_GG|PMS_HW_LCD))
if (Pico.m.hardware & PMS_HW_LCD)
xoff -= 48; // GG LCD, adjust to center 160 px
sat = (u8 *)PicoMem.vram + ((pv->reg[5] & 0x7e) << 7);
@ -237,7 +237,7 @@ static void DrawStripM4(const u16 *nametab, int cells_dx, int tilex_ty)
int addr = 0, pal = 0;
// Draw tiles across screen:
for (; cells_dx > 0; cells_dx += 8, tilex_ty++, cells_dx -= 0x10000)
for (; cells_dx >= 0; cells_dx += 8, tilex_ty++, cells_dx -= 0x10000)
{
unsigned int pack;
unsigned code;
@ -294,7 +294,7 @@ static void DrawDisplayM4(int scanline)
tilex = (32 - (dx >> 3) + cellskip) & 0x1f;
ty = (line & 7) << 1; // Y-Offset into tile
cells = maxcells - cellskip;
cells = maxcells - cellskip - 1;
dx = (dx & 7);
dx += cellskip << 3;
@ -302,7 +302,7 @@ static void DrawDisplayM4(int scanline)
// tiles
if (!(pv->debug_p & PVD_KILL_B)) {
if ((Pico.m.hardware & (PMS_HW_GG|PMS_HW_LCD)) == (PMS_HW_GG|PMS_HW_LCD)) {
if (Pico.m.hardware & PMS_HW_LCD) {
// on GG render only the center 160 px, but mind hscroll
DrawStripM4(nametab , (dx-8) | ((cells-11)<< 16),(tilex+5) | (ty << 16));
} else if (pv->reg[0] & 0x80) {
@ -318,7 +318,7 @@ static void DrawDisplayM4(int scanline)
if (!(pv->debug_p & PVD_KILL_S_LO))
DrawSpritesM4();
if ((pv->reg[0] & 0x20) && (Pico.m.hardware & (PMS_HW_GG|PMS_HW_LCD)) != (PMS_HW_GG|PMS_HW_LCD)) {
if ((pv->reg[0] & 0x20) && !(Pico.m.hardware & PMS_HW_LCD)) {
// first column masked with background, caculate offset to start of line
dx = line_offset / 4;
ty = ((pv->reg[7]&0x0f)|0x10) * 0x01010101;
@ -742,7 +742,7 @@ void PicoFrameStartSMS(void)
// Copy LCD enable flag for easier handling
Pico.m.hardware &= ~PMS_HW_LCD;
if ((PicoIn.opt & POPT_EN_GG_LCD) && (Pico.m.hardware & PMS_HW_GG))
if ((PicoIn.opt & POPT_EN_GG_LCD) && (PicoIn.AHW & PAHW_GG))
Pico.m.hardware |= PMS_HW_LCD;
if (!(Pico.m.hardware & PMS_HW_LCD) && (mode & 4) && (Pico.video.reg[0] & 0x20)) {
@ -750,7 +750,7 @@ void PicoFrameStartSMS(void)
columns = 248;
Pico.est.rendstatus |= PDRAW_SMS_BLANK_1;
}
if ((Pico.m.hardware & (PMS_HW_GG|PMS_HW_LCD)) == (PMS_HW_GG|PMS_HW_LCD)) {
if (Pico.m.hardware & PMS_HW_LCD) {
// GG LCD always has 160x144 regardless of settings
screen_offset = 24; // nonetheless the vdp timing has 224 lines
loffs = 48;
@ -811,7 +811,7 @@ void PicoLineSMS(int line)
unsigned bgcolor;
// GG LCD, render only visible part of screen
if ((Pico.m.hardware & (PMS_HW_GG|PMS_HW_LCD)) == (PMS_HW_GG|PMS_HW_LCD) && (line < 24 || line >= 24+144))
if ((Pico.m.hardware & PMS_HW_LCD) && (line < 24 || line >= 24+144))
goto norender;
if (PicoScanBegin != NULL && skip == 0)
@ -878,7 +878,7 @@ void PicoDoHighPal555SMS(void)
* hence GG/SMS/TMS can all be handled the same here */
for (j = cnt; j > 0; j--) {
if (!(Pico.video.reg[0] & 0x4)) // fixed palette in TMS modes
spal = (u32 *)tmspal + (Pico.m.hardware & (PMS_HW_SG|PMS_HW_SC) ? 16/2:0);
spal = (u32 *)tmspal + (PicoIn.AHW & (PAHW_SG|PAHW_SC) ? 16/2:0);
for (i = 0x20/2; i > 0; i--, spal++, dpal++) {
t = *spal;
#if defined(USE_BGR555)

3
pico/pico.h
View file

@ -83,6 +83,9 @@ extern void *p32x_bios_g, *p32x_bios_m, *p32x_bios_s;
#define PAHW_SVP (1<<2)
#define PAHW_PICO (1<<3)
#define PAHW_SMS (1<<4)
#define PAHW_GG (1<<5)
#define PAHW_SG (1<<6)
#define PAHW_SC (1<<7)
#define PHWS_AUTO 0
#define PHWS_GG 1

3
pico/pico_int.h
View file

@ -342,11 +342,8 @@ struct PicoMisc
unsigned int frame_count; // 1c for movies and idle det
};
#define PMS_HW_GG 0x1 // Game Gear
#define PMS_HW_LCD 0x2 // GG LCD
#define PMS_HW_JAP 0x4 // japanese system
#define PMS_HW_SG 0x8 // SG-1000
#define PMS_HW_SC 0x10 // SC-3000
#define PMS_MAP_AUTO 0
#define PMS_MAP_SEGA 1

59
pico/sms.c
View file

@ -57,7 +57,7 @@ static void vdp_data_write(unsigned char d)
if (pv->type == 3) {
// cram. 32 on SMS, but 64 on MD. Fill 2nd half of cram for prio bit mirror
if (Pico.m.hardware & PMS_HW_GG) { // GG, same layout as MD
if (PicoIn.AHW & PAHW_GG) { // GG, same layout as MD
unsigned a = pv->addr & 0x3f;
if (a & 0x1) { // write complete color on high byte write
u16 c = ((d&0x0f) << 8) | Pico.ms.vdp_buffer;
@ -160,7 +160,7 @@ static unsigned char z80_sms_in(unsigned short a)
{
case 0x00:
case 0x01:
if ((Pico.m.hardware & PMS_HW_GG) && a < 0x8) { // GG I/O area
if ((PicoIn.AHW & PAHW_GG) && a < 0x8) { // GG I/O area
switch (a) {
case 0: d = 0xff & ~(PicoIn.pad[0] & 0x80); break;
case 1: d = Pico.ms.io_gg[1] | (Pico.ms.io_gg[2] & 0x7f); break;
@ -189,14 +189,14 @@ static unsigned char z80_sms_in(unsigned short a)
break;
case 0xc0: /* I/O port A and B */
if (! (Pico.m.hardware & PMS_HW_SC) || (Pico.ms.io_sg & 7) == 7)
if (! (PicoIn.AHW & PAHW_SC) || (Pico.ms.io_sg & 7) == 7)
d = ~((PicoIn.pad[0] & 0x3f) | (PicoIn.pad[1] << 6));
else
; // read kbd 8 bits
break;
case 0xc1: /* I/O port B and miscellaneous */
if (! (Pico.m.hardware & PMS_HW_SC) || (Pico.ms.io_sg & 7) == 7) {
if (! (PicoIn.AHW & PAHW_SC) || (Pico.ms.io_sg & 7) == 7) {
d = (Pico.ms.io_ctl & 0x80) | ((Pico.ms.io_ctl << 1) & 0x40) | 0x30;
d |= ~(PicoIn.pad[1] >> 2) & 0x0f;
if (Pico.ms.io_ctl & 0x08) d |= 0x80; // TH as input is unconnected
@ -238,11 +238,11 @@ static void z80_sms_out(unsigned short a, unsigned char d)
switch (a & 0xc1)
{
case 0x00:
if ((Pico.m.hardware & PMS_HW_GG) && a < 0x8) // GG I/O area
if ((PicoIn.AHW & PAHW_GG) && a < 0x8) // GG I/O area
Pico.ms.io_gg[a] = d;
break;
case 0x01:
if ((Pico.m.hardware & PMS_HW_GG) && a < 0x8) { // GG I/O area
if ((PicoIn.AHW & PAHW_GG) && a < 0x8) { // GG I/O area
Pico.ms.io_gg[a] = d;
} else {
// pad. latch hcounter if one of the TH lines is switched to 1
@ -267,7 +267,7 @@ static void z80_sms_out(unsigned short a, unsigned char d)
break;
case 0xc0:
if ((Pico.m.hardware & PMS_HW_SC) && (a & 0x2))
if ((PicoIn.AHW & PAHW_SC) && (a & 0x2))
Pico.ms.io_sg = d; // 0xc2 = kbd/pad select
}
}
@ -535,9 +535,11 @@ char *mappers[] = {
// Before adding more mappers this should be revised.
static void xwrite(unsigned int a, unsigned char d)
{
int sz = (PicoIn.AHW & (PAHW_SG|PAHW_SC) ? 2 : 8) * 1024;
elprintf(EL_IO, "z80 write [%04x] %02x", a, d);
if (a >= 0xc000)
PicoMem.zram[a & 0x1fff] = d;
PicoMem.zram[a & (sz-1)] = d;
switch (Pico.ms.mapper) { // via config, or auto detected
case PMS_MAP_SEGA: write_bank_sega(a, d); break;
@ -556,9 +558,9 @@ static void xwrite(unsigned int a, unsigned char d)
// disable autodetection after some time
if ((a >= 0xc000 && a < 0xfff8) || Pico.ms.mapcnt > 20) break;
// NB the sequence of mappers is crucial for the auto detection
if (Pico.m.hardware & PMS_HW_SC) {
if (PicoIn.AHW & PAHW_SC) {
write_bank_x32k(a,d);
} else if (Pico.m.hardware & PMS_HW_SG) {
} else if (PicoIn.AHW & PAHW_SG) {
write_bank_x8k(a, d);
} else {
write_bank_n32k(a, d);
@ -595,11 +597,11 @@ void PicoResetMS(void)
// set preselected hw/mapper from config
if (PicoIn.hwSelect) {
Pico.m.hardware &= ~(PMS_HW_GG|PMS_HW_SG|PMS_HW_SC);
PicoIn.AHW &= ~(PAHW_GG|PAHW_SG|PAHW_SC);
switch (PicoIn.hwSelect) {
case PHWS_GG: Pico.m.hardware |= PMS_HW_GG; break;
case PHWS_SG: Pico.m.hardware |= PMS_HW_SG; break;
case PHWS_SC: Pico.m.hardware |= PMS_HW_SC; break;
case PHWS_GG: PicoIn.AHW |= PAHW_GG; break;
case PHWS_SG: PicoIn.AHW |= PAHW_SG; break;
case PHWS_SC: PicoIn.AHW |= PAHW_SC; break;
}
}
Pico.ms.mapcnt = Pico.ms.mapper = 0;
@ -614,9 +616,9 @@ void PicoResetMS(void)
if (!memcmp(Pico.rom + tmr-16, "TMR SEGA", 8)) {
hw = Pico.rom[tmr-1] >> 4;
if (!PicoIn.hwSelect) {
Pico.m.hardware &= ~(PMS_HW_GG|PMS_HW_SG|PMS_HW_SC);
PicoIn.AHW &= ~(PAHW_GG|PAHW_SG|PAHW_SC);
if (hw >= 0x5 && hw < 0x8)
Pico.m.hardware |= PMS_HW_GG; // GG cartridge detected
PicoIn.AHW |= PAHW_GG; // GG cartridge detected
}
if (!PicoIn.regionOverride) {
Pico.m.hardware &= ~PMS_HW_JAP;
@ -655,7 +657,7 @@ void PicoResetMS(void)
Pico.video.reg[10] = 0xff;
// BIOS, clear zram (unitialized on Mark-III, cf src/mame/drivers/sms.cpp)
i = (Pico.m.hardware & (PMS_HW_JAP|PMS_HW_GG)) == PMS_HW_JAP ? 0xf0 : 0x00;
i = !(PicoIn.AHW & PAHW_GG) && (Pico.m.hardware & PMS_HW_JAP) ? 0xf0 : 0x00;
memset(PicoMem.zram, i, sizeof(PicoMem.zram));
}
@ -666,7 +668,6 @@ void PicoPowerMS(void)
memset(&PicoMem,0,sizeof(PicoMem));
memset(&Pico.video,0,sizeof(Pico.video));
memset(&Pico.m,0,sizeof(Pico.m));
Pico.m.pal = 0;
// calculate a mask for bank writes.
// ROM loader has aligned the size for us, so this is safe.
@ -686,16 +687,20 @@ void PicoPowerMS(void)
void PicoMemSetupMS(void)
{
u8 mapper = Pico.ms.mapper;
int sz = (PicoIn.AHW & (PAHW_SG|PAHW_SC) ? 2 : 8) * 1024;
u32 a;
// RAM and its mirrors
for (a = 0xc000; a < 0x10000; a += sz) {
z80_map_set(z80_read_map, a, a + sz-1, PicoMem.zram, 0);
z80_map_set(z80_write_map, a, a + sz-1, PicoMem.zram, 0);
}
a = 0x10000 - (1<<Z80_MEM_SHIFT);
z80_map_set(z80_write_map, a, 0xffff, xwrite, 1); // mapper detection
// ROM
z80_map_set(z80_read_map, 0x0000, 0xbfff, Pico.rom, 0);
z80_map_set(z80_read_map, 0xc000, 0xdfff, PicoMem.zram, 0);
z80_map_set(z80_read_map, 0xe000, 0xffff, PicoMem.zram, 0);
z80_map_set(z80_write_map, 0xc000, 0xdfff, PicoMem.zram, 0);
z80_map_set(z80_write_map, 0xe000, 0xffff, PicoMem.zram, 0);
z80_map_set(z80_write_map, 0x0000, 0xbfff, xwrite, 1);
z80_map_set(z80_write_map, 0xfc00, 0xffff, xwrite, 1);
z80_map_set(z80_write_map, 0x0000, 0xbfff, xwrite, 1); // mapper detection
// Nemesis mapper maps last 8KB rom bank #15 to adress 0
if (mapper == PMS_MAP_NEMESIS && Pico.romsize > 0x1e000)
@ -800,7 +805,7 @@ void PicoFrameMS(void)
// for SMS the pause button generates an NMI, for GG ths is not the case
nmi = (PicoIn.pad[0] >> 7) & 1;
if (!(Pico.m.hardware & PMS_HW_GG) && !Pico.ms.nmi_state && nmi)
if (!(PicoIn.AHW & PAHW_GG) && !Pico.ms.nmi_state && nmi)
z80_nmi();
Pico.ms.nmi_state = nmi;