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https://github.com/RaySollium99/picodrive.git
synced 2025-09-05 15:27:46 -04:00
32x: implement VDP fill, improve PWM, division unit and scheduling
Chaotix works but unstable git-svn-id: file:///home/notaz/opt/svn/PicoDrive@794 be3aeb3a-fb24-0410-a615-afba39da0efa
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notaz
parent
87accdf72d
commit
be20816c4c
8 changed files with 99 additions and 44 deletions
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@ -7,29 +7,29 @@ struct Pico32xMem *Pico32xMem;
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static void bank_switch(int b);
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#define MSB8(x) ((x) >> 8)
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// poll detection
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#define POLL_THRESHOLD 6
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struct poll_det {
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int addr, pc, cnt, flag;
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u32 addr, cycles, cyc_max;
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int cnt, flag;
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};
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static struct poll_det m68k_poll, sh2_poll[2];
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static int p32x_poll_detect(struct poll_det *pd, u32 a, u32 pc, int is_vdp)
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static int p32x_poll_detect(struct poll_det *pd, u32 a, u32 cycles, int is_vdp)
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{
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int ret = 0, flag = pd->flag;
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if (is_vdp)
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flag <<= 3;
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if (a - 2 <= pd->addr && pd->addr <= a + 2) { // && pd->pc == pc) {
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if (a - 2 <= pd->addr && pd->addr <= a + 2 && cycles - pd->cycles < pd->cyc_max) {
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pd->cnt++;
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if (pd->cnt > POLL_THRESHOLD) {
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if (!(Pico32x.emu_flags & flag)) {
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elprintf(EL_32X, "%s poll addr %08x @ %06x",
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flag == P32XF_68KPOLL ? "m68k" : (flag == P32XF_MSH2POLL ? "msh2" : "ssh2"), a, pc);
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elprintf(EL_32X, "%s poll addr %08x, cyc %u",
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flag & (P32XF_68KPOLL|P32XF_68KVPOLL) ? "m68k" :
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(flag & (P32XF_MSH2POLL|P32XF_MSH2VPOLL) ? "msh2" : "ssh2"), a, cycles - pd->cycles);
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ret = 1;
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}
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Pico32x.emu_flags |= flag;
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@ -38,7 +38,7 @@ static int p32x_poll_detect(struct poll_det *pd, u32 a, u32 pc, int is_vdp)
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else
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pd->cnt = 0;
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pd->addr = a;
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pd->pc = pc;
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pd->cycles = cycles;
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return ret;
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}
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@ -47,11 +47,15 @@ static int p32x_poll_undetect(struct poll_det *pd, int is_vdp)
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{
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int ret = 0, flag = pd->flag;
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if (is_vdp)
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flag <<= 3;
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if (pd->cnt > POLL_THRESHOLD)
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flag <<= 3; // VDP only
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else
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flag |= flag << 3; // both
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if (Pico32x.emu_flags & flag) {
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elprintf(EL_32X, "poll %02x -> %02x", Pico32x.emu_flags, Pico32x.emu_flags & ~flag);
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ret = 1;
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pd->addr = pd->cnt = 0;
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}
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Pico32x.emu_flags &= ~flag;
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pd->addr = pd->cnt = 0;
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return ret;
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}
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@ -112,7 +116,7 @@ static void dma_68k2sh2_do(void)
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for (i = 0; i < Pico32x.dmac_ptr && dmac0->tcr0 > 0; i++) {
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extern void p32x_sh2_write16(u32 a, u32 d, int id);
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elprintf(EL_32X|EL_ANOMALY, "dmaw [%08x] %04x, left %d", dmac0->dar0, Pico32x.dmac_fifo[i], *dreqlen);
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elprintf(EL_32X, "dmaw [%08x] %04x, left %d", dmac0->dar0, Pico32x.dmac_fifo[i], *dreqlen);
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p32x_sh2_write16(dmac0->dar0, Pico32x.dmac_fifo[i], 0);
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dmac0->dar0 += 2;
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dmac0->tcr0--;
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@ -123,8 +127,10 @@ static void dma_68k2sh2_do(void)
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Pico32x.regs[6 / 2] &= ~P32XS_FULL;
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if (*dreqlen == 0)
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Pico32x.regs[6 / 2] &= ~P32XS_68S; // transfer complete
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if (dmac0->tcr0 == 0)
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if (dmac0->tcr0 == 0) {
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dmac0->chcr0 |= 2; // DMA has ended normally
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p32x_poll_undetect(&sh2_poll[0], 0);
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}
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}
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// ------------------------------------------------------------------
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@ -140,7 +146,7 @@ static u32 p32x_reg_read16(u32 a)
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if ((a & 0x30) == 0x20)
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return sh2_comm_faker(a);
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#else
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if ((a & 0x30) == 0x20 && p32x_poll_detect(&m68k_poll, a, SekPc, 0)) {
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if ((a & 0x30) == 0x20 && p32x_poll_detect(&m68k_poll, a, SekCyclesDoneT(), 0)) {
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SekEndRun(16);
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}
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#endif
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@ -276,6 +282,11 @@ static void p32x_vdp_write8(u32 a, u32 d)
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if ((r[0] ^ d) & P32XV_PRI)
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Pico32x.dirty_pal = 1;
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r[0] = (r[0] & P32XV_nPAL) | (d & 0xff);
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if ((d & 3) == 3)
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elprintf(EL_32X|EL_ANOMALY, "TODO: mode3");
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break;
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case 0x05: // fill len
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r[4 / 2] = d & 0xff;
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break;
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case 0x0b:
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d &= 1;
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@ -292,6 +303,24 @@ static void p32x_vdp_write8(u32 a, u32 d)
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static void p32x_vdp_write16(u32 a, u32 d)
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{
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a &= 0x0e;
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if (a == 6) { // fill start
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Pico32x.vdp_regs[6 / 2] = d;
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return;
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}
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if (a == 8) { // fill data
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u16 *dram = Pico32xMem->dram[(Pico32x.vdp_regs[0x0a/2] & P32XV_FS) ^ 1];
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int len = Pico32x.vdp_regs[4 / 2];
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a = Pico32x.vdp_regs[6 / 2];
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while (len--) {
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dram[a] = d;
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a = (a & 0xff00) | ((a + 1) & 0xff);
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}
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Pico32x.vdp_regs[6 / 2] = a;
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Pico32x.vdp_regs[8 / 2] = d;
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return;
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}
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p32x_vdp_write8(a | 1, d);
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}
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@ -317,7 +346,7 @@ static u32 p32x_sh2reg_read16(u32 a, int cpuid)
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return r[a / 2];
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// comm port
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if ((a & 0x30) == 0x20) {
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if (p32x_poll_detect(&sh2_poll[cpuid], a, sh2_pc(cpuid), 0))
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if (p32x_poll_detect(&sh2_poll[cpuid], a, ash2_cycles_done(), 0))
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ash2_end_run(8);
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return r[a / 2];
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}
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@ -375,7 +404,10 @@ static void p32x_sh2reg_write16(u32 a, u32 d, int cpuid)
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case 0x16: Pico32x.sh2irqs &= ~P32XI_VINT; goto irls;
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case 0x18: Pico32x.sh2irqs &= ~P32XI_HINT; goto irls;
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case 0x1a: Pico32x.sh2irqi[cpuid] &= ~P32XI_CMD; goto irls;
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case 0x1c: Pico32x.sh2irqs &= ~P32XI_PWM; goto irls;
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case 0x1c:
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Pico32x.sh2irqs &= ~P32XI_PWM;
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p32x_pwm_irq_check(0);
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goto irls;
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}
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p32x_sh2reg_write8(a | 1, d, cpuid);
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@ -422,29 +454,31 @@ static void sh2_peripheral_write8(u32 a, u32 d, int id)
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static void sh2_peripheral_write32(u32 a, u32 d, int id)
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{
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unsigned int *r = Pico32xMem->sh2_peri_regs[id];
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u32 *r = Pico32xMem->sh2_peri_regs[id];
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elprintf(EL_32X, "%csh2 peri w32 [%08x] %08x @%06x", id ? 's' : 'm', a, d, sh2_pc(id));
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a &= 0x1fc;
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r[a / 4] = d;
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switch (a) {
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// division unit:
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// division unit (TODO: verify):
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case 0x104: // DVDNT: divident L, starts divide
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elprintf(EL_32X, "%csh2 divide %08x / %08x", id ? 's' : 'm', d, r[0x100 / 4]);
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if (r[0x100 / 4]) {
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r[0x118 / 4] = r[0x110 / 4] = d % r[0x100 / 4];
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r[0x11c / 4] = r[0x114 / 4] = d / r[0x100 / 4];
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signed int divisor = r[0x100 / 4];
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r[0x118 / 4] = r[0x110 / 4] = (signed int)d % divisor;
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r[0x104 / 4] = r[0x11c / 4] = r[0x114 / 4] = (signed int)d / divisor;
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}
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break;
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case 0x114:
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elprintf(EL_32X, "%csh2 divide %08x%08x / %08x @%08x",
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id ? 's' : 'm', r[0x110 / 4], d, r[0x100 / 4], sh2_pc(id));
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if (r[0x100 / 4]) {
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long long divident = (long long)r[0x110 / 4] << 32 | d;
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signed long long divident = (signed long long)r[0x110 / 4] << 32 | d;
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signed int divisor = r[0x100 / 4];
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// XXX: undocumented mirroring to 0x118,0x11c?
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r[0x118 / 4] = r[0x110 / 4] = divident % r[0x100 / 4];
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r[0x11c / 4] = r[0x114 / 4] = divident / r[0x100 / 4];
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r[0x118 / 4] = r[0x110 / 4] = divident % divisor;
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r[0x11c / 4] = r[0x114 / 4] = divident / divisor;
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}
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break;
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}
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@ -453,6 +487,12 @@ static void sh2_peripheral_write32(u32 a, u32 d, int id)
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elprintf(EL_32X, "sh2 DMA %08x -> %08x, cnt %d, chcr %04x @%06x",
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dmac0->sar0, dmac0->dar0, dmac0->tcr0, dmac0->chcr0, sh2_pc(id));
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dmac0->tcr0 &= 0xffffff;
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// HACK: assume bus is busy and SH2 is halted
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// XXX: use different mechanism for this, not poll det
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Pico32x.emu_flags |= id ? P32XF_SSH2POLL : P32XF_MSH2POLL;
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ash2_end_run(5);
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// DREQ is only sent after first 4 words are written.
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// we do multiple of 4 words to avoid messing up alignment
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if (dmac0->sar0 == 0x20004012 && Pico32x.dmac_ptr && (Pico32x.dmac_ptr & 3) == 0) {
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@ -683,7 +723,7 @@ u32 p32x_sh2_read8(u32 a, int id)
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if ((a & 0xdfffff00) == 0x4100) {
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d = p32x_vdp_read16(a);
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if (p32x_poll_detect(&sh2_poll[id], a, sh2_pc(id), 1))
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if (p32x_poll_detect(&sh2_poll[id], a, ash2_cycles_done(), 1))
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ash2_end_run(8);
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goto out_16to8;
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}
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@ -740,7 +780,7 @@ u32 p32x_sh2_read16(u32 a, int id)
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if ((a & 0xdfffff00) == 0x4100) {
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d = p32x_vdp_read16(a);
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if (p32x_poll_detect(&sh2_poll[id], a, sh2_pc(id), 1))
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if (p32x_poll_detect(&sh2_poll[id], a, ash2_cycles_done(), 1))
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ash2_end_run(8);
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goto out;
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}
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@ -847,6 +887,7 @@ void p32x_sh2_write16(u32 a, u32 d, int id)
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}
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if ((a & 0xdfffff00) == 0x4100) {
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sh2_poll[id].cnt = 0; // for poll before VDP accesses
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p32x_vdp_write16(a, d);
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return;
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}
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@ -972,7 +1013,10 @@ void PicoMemSetup32x(void)
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// setup poll detector
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m68k_poll.flag = P32XF_68KPOLL;
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m68k_poll.cyc_max = 64;
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sh2_poll[0].flag = P32XF_MSH2POLL;
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sh2_poll[0].cyc_max = 16;
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sh2_poll[1].flag = P32XF_SSH2POLL;
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sh2_poll[1].cyc_max = 16;
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}
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