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- /*
- * PicoDrive
- * (c) Copyright Dave, 2004
- * (C) notaz, 2006-2009
- *
- * This work is licensed under the terms of MAME license.
- * See COPYING file in the top-level directory.
- */
- #include "pico_int.h"
- #define NEED_DMA_SOURCE
- #include "memory.h"
- extern const unsigned char hcounts_32[];
- extern const unsigned char hcounts_40[];
- #ifndef UTYPES_DEFINED
- typedef unsigned char u8;
- typedef unsigned short u16;
- typedef unsigned int u32;
- #define UTYPES_DEFINED
- #endif
- int (*PicoDmaHook)(unsigned int source, int len, unsigned short **base, unsigned int *mask) = NULL;
- static __inline void AutoIncrement(void)
- {
- Pico.video.addr=(unsigned short)(Pico.video.addr+Pico.video.reg[0xf]);
- }
- static NOINLINE void VideoWrite128(u32 a, u16 d)
- {
- // nasty
- a = ((a & 2) >> 1) | ((a & 0x400) >> 9) | (a & 0x3FC) | ((a & 0x1F800) >> 1);
- ((u8 *)PicoMem.vram)[a] = d;
- }
- static void VideoWrite(u16 d)
- {
- unsigned int a = Pico.video.addr;
- switch (Pico.video.type)
- {
- case 1: if (a & 1)
- d = (u16)((d << 8) | (d >> 8));
- PicoMem.vram [(a >> 1) & 0x7fff] = d;
- if (a - ((unsigned)(Pico.video.reg[5]&0x7f) << 9) < 0x400)
- Pico.est.rendstatus |= PDRAW_DIRTY_SPRITES;
- break;
- case 3: Pico.m.dirtyPal = 1;
- PicoMem.cram [(a >> 1) & 0x3f] = d; break;
- case 5: PicoMem.vsram[(a >> 1) & 0x3f] = d; break;
- case 0x81:
- a |= Pico.video.addr_u << 16;
- VideoWrite128(a, d);
- break;
- //default:elprintf(EL_ANOMALY, "VDP write %04x with bad type %i", d, Pico.video.type); break;
- }
- AutoIncrement();
- }
- static unsigned int VideoRead(void)
- {
- unsigned int a=0,d=0;
- a=Pico.video.addr; a>>=1;
- switch (Pico.video.type)
- {
- case 0: d=PicoMem.vram [a & 0x7fff]; break;
- case 8: d=PicoMem.cram [a & 0x003f]; break;
- case 4: d=PicoMem.vsram[a & 0x003f]; break;
- default:elprintf(EL_ANOMALY, "VDP read with bad type %i", Pico.video.type); break;
- }
- AutoIncrement();
- return d;
- }
- static int GetDmaLength(void)
- {
- struct PicoVideo *pvid=&Pico.video;
- int len=0;
- // 16-bit words to transfer:
- len =pvid->reg[0x13];
- len|=pvid->reg[0x14]<<8;
- len = ((len - 1) & 0xffff) + 1;
- return len;
- }
- static void DmaSlow(int len, unsigned int source)
- {
- u32 inc = Pico.video.reg[0xf];
- u32 a = Pico.video.addr;
- u16 *r, *base = NULL;
- u32 mask = 0x1ffff;
- elprintf(EL_VDPDMA, "DmaSlow[%i] %06x->%04x len %i inc=%i blank %i [%u] @ %06x",
- Pico.video.type, source, a, len, inc, (Pico.video.status&8)||!(Pico.video.reg[1]&0x40),
- SekCyclesDone(), SekPc);
- Pico.m.dma_xfers += len;
- if (Pico.m.dma_xfers < len) // lame 16bit var
- Pico.m.dma_xfers = ~0;
- SekCyclesBurnRun(CheckDMA());
- if ((source & 0xe00000) == 0xe00000) { // Ram
- base = (u16 *)PicoMem.ram;
- mask = 0xffff;
- }
- else if (PicoIn.AHW & PAHW_MCD)
- {
- u8 r3 = Pico_mcd->s68k_regs[3];
- elprintf(EL_VDPDMA, "DmaSlow CD, r3=%02x", r3);
- if (source < 0x20000) { // Bios area
- base = (u16 *)Pico_mcd->bios;
- } else if ((source & 0xfc0000) == 0x200000) { // Word Ram
- if (!(r3 & 4)) { // 2M mode
- base = (u16 *)(Pico_mcd->word_ram2M + (source & 0x20000));
- } else {
- if (source < 0x220000) { // 1M mode
- int bank = r3 & 1;
- base = (u16 *)(Pico_mcd->word_ram1M[bank]);
- } else {
- DmaSlowCell(source - 2, a, len, inc);
- return;
- }
- }
- source -= 2;
- } else if ((source & 0xfe0000) == 0x020000) { // Prg Ram
- base = (u16 *)Pico_mcd->prg_ram_b[r3 >> 6];
- source -= 2; // XXX: test
- }
- }
- else
- {
- // if we have DmaHook, let it handle ROM because of possible DMA delay
- u32 source2;
- if (PicoDmaHook && (source2 = PicoDmaHook(source, len, &base, &mask)))
- source = source2;
- else // Rom
- base = m68k_dma_source(source);
- }
- if (!base) {
- elprintf(EL_VDPDMA|EL_ANOMALY, "DmaSlow[%i] %06x->%04x: invalid src", Pico.video.type, source, a);
- return;
- }
- // operate in words
- source >>= 1;
- mask >>= 1;
- switch (Pico.video.type)
- {
- case 1: // vram
- r = PicoMem.vram;
- if (inc == 2 && !(a & 1) && a + len * 2 < 0x10000
- && !(((source + len - 1) ^ source) & ~mask))
- {
- // most used DMA mode
- memcpy((char *)r + a, base + (source & mask), len * 2);
- a += len * 2;
- }
- else
- {
- for(; len; len--)
- {
- u16 d = base[source++ & mask];
- if(a & 1) d=(d<<8)|(d>>8);
- r[a >> 1] = d;
- // AutoIncrement
- a = (u16)(a + inc);
- }
- }
- Pico.est.rendstatus |= PDRAW_DIRTY_SPRITES;
- break;
- case 3: // cram
- Pico.m.dirtyPal = 1;
- r = PicoMem.cram;
- for (; len; len--)
- {
- r[(a / 2) & 0x3f] = base[source++ & mask];
- // AutoIncrement
- a += inc;
- }
- break;
- case 5: // vsram
- r = PicoMem.vsram;
- for (; len; len--)
- {
- r[(a / 2) & 0x3f] = base[source++ & mask];
- // AutoIncrement
- a += inc;
- }
- break;
- case 0x81: // vram 128k
- a |= Pico.video.addr_u << 16;
- for(; len; len--)
- {
- VideoWrite128(a, base[source++ & mask]);
- // AutoIncrement
- a = (a + inc) & 0x1ffff;
- }
- Pico.video.addr_u = a >> 16;
- break;
- default:
- if (Pico.video.type != 0 || (EL_LOGMASK & EL_VDPDMA))
- elprintf(EL_VDPDMA|EL_ANOMALY, "DMA with bad type %i", Pico.video.type);
- break;
- }
- // remember addr
- Pico.video.addr=(u16)a;
- }
- static void DmaCopy(int len)
- {
- u16 a = Pico.video.addr;
- u8 *vr = (u8 *)PicoMem.vram;
- u8 inc = Pico.video.reg[0xf];
- int source;
- elprintf(EL_VDPDMA, "DmaCopy len %i [%u]", len, SekCyclesDone());
- Pico.m.dma_xfers += len;
- if (Pico.m.dma_xfers < len)
- Pico.m.dma_xfers = ~0;
- Pico.video.status |= 2; // dma busy
- source =Pico.video.reg[0x15];
- source|=Pico.video.reg[0x16]<<8;
- for (; len; len--)
- {
- vr[a] = vr[source++ & 0xffff];
- // AutoIncrement
- a=(u16)(a+inc);
- }
- // remember addr
- Pico.video.addr=a;
- Pico.est.rendstatus |= PDRAW_DIRTY_SPRITES;
- }
- static NOINLINE void DmaFill(int data)
- {
- u16 a = Pico.video.addr;
- u8 *vr = (u8 *)PicoMem.vram;
- u8 high = (u8)(data >> 8);
- u8 inc = Pico.video.reg[0xf];
- int source;
- int len, l;
- len = GetDmaLength();
- elprintf(EL_VDPDMA, "DmaFill len %i inc %i [%u]", len, inc, SekCyclesDone());
- Pico.m.dma_xfers += len;
- if (Pico.m.dma_xfers < len) // lame 16bit var
- Pico.m.dma_xfers = ~0;
- Pico.video.status |= 2; // dma busy
- switch (Pico.video.type)
- {
- case 1: // vram
- for (l = len; l; l--) {
- // Write upper byte to adjacent address
- // (here we are byteswapped, so address is already 'adjacent')
- vr[a] = high;
- // Increment address register
- a = (u16)(a + inc);
- }
- break;
- case 3: // cram
- case 5: { // vsram
- // TODO: needs fifo; anyone using these?
- static int once;
- if (!once++)
- elprintf(EL_STATUS|EL_ANOMALY|EL_VDPDMA, "TODO: cram/vsram fill");
- }
- default:
- a += len * inc;
- break;
- }
- // remember addr
- Pico.video.addr = a;
- // register update
- Pico.video.reg[0x13] = Pico.video.reg[0x14] = 0;
- source = Pico.video.reg[0x15];
- source |= Pico.video.reg[0x16] << 8;
- source += len;
- Pico.video.reg[0x15] = source;
- Pico.video.reg[0x16] = source >> 8;
- Pico.est.rendstatus |= PDRAW_DIRTY_SPRITES;
- }
- static NOINLINE void CommandDma(void)
- {
- struct PicoVideo *pvid=&Pico.video;
- u32 len, method;
- u32 source;
- if ((pvid->reg[1]&0x10)==0) return; // DMA not enabled
- len = GetDmaLength();
- source =Pico.video.reg[0x15];
- source|=Pico.video.reg[0x16] << 8;
- source|=Pico.video.reg[0x17] << 16;
- method=pvid->reg[0x17]>>6;
- if (method < 2)
- DmaSlow(len, source << 1); // 68000 to VDP
- else if (method == 3)
- DmaCopy(len); // VRAM Copy
- else
- return;
- source += len;
- Pico.video.reg[0x13] = Pico.video.reg[0x14] = 0;
- Pico.video.reg[0x15] = source;
- Pico.video.reg[0x16] = source >> 8;
- }
- static NOINLINE void CommandChange(void)
- {
- struct PicoVideo *pvid = &Pico.video;
- unsigned int cmd, addr;
- cmd = pvid->command;
- // Get type of transfer 0xc0000030 (v/c/vsram read/write)
- pvid->type = (u8)(((cmd >> 2) & 0xc) | (cmd >> 30));
- if (pvid->type == 1) // vram
- pvid->type |= pvid->reg[1] & 0x80; // 128k
- // Get address 0x3fff0003
- addr = (cmd >> 16) & 0x3fff;
- addr |= (cmd << 14) & 0xc000;
- pvid->addr = (u16)addr;
- pvid->addr_u = (u8)((cmd >> 2) & 1);
- }
- static void DrawSync(int blank_on)
- {
- if (Pico.m.scanline < 224 && !(PicoIn.opt & POPT_ALT_RENDERER) &&
- !PicoIn.skipFrame && Pico.est.DrawScanline <= Pico.m.scanline) {
- //elprintf(EL_ANOMALY, "sync");
- PicoDrawSync(Pico.m.scanline, blank_on);
- }
- }
- PICO_INTERNAL_ASM void PicoVideoWrite(unsigned int a,unsigned short d)
- {
- struct PicoVideo *pvid=&Pico.video;
- //elprintf(EL_STATUS, "PicoVideoWrite [%06x] %04x [%u] @ %06x",
- // a, d, SekCyclesDone(), SekPc);
- a &= 0x1c;
- switch (a)
- {
- case 0x00: // Data port 0 or 2
- // try avoiding the sync..
- if (Pico.m.scanline < 224 && (pvid->reg[1]&0x40) &&
- !(!pvid->pending &&
- ((pvid->command & 0xc00000f0) == 0x40000010 && PicoMem.vsram[pvid->addr>>1] == d))
- )
- DrawSync(0);
- if (pvid->pending) {
- CommandChange();
- pvid->pending=0;
- }
- if (!(pvid->status & SR_VB) && !(PicoIn.opt&POPT_DIS_VDP_FIFO))
- {
- int use = pvid->type == 1 ? 2 : 1;
- pvid->lwrite_cnt -= use;
- if (pvid->lwrite_cnt < 0)
- SekCyclesLeft = 0;
- elprintf(EL_ASVDP, "VDP data write: [%04x] %04x [%u] {%i} #%i @ %06x",
- Pico.video.addr, d, SekCyclesDone(), Pico.video.type, pvid->lwrite_cnt, SekPc);
- }
- VideoWrite(d);
- if ((pvid->command&0x80) && (pvid->reg[1]&0x10) && (pvid->reg[0x17]>>6)==2)
- DmaFill(d);
- break;
- case 0x04: // Control (command) port 4 or 6
- if (pvid->pending)
- {
- // Low word of command:
- pvid->command &= 0xffff0000;
- pvid->command |= d;
- pvid->pending = 0;
- CommandChange();
- // Check for dma:
- if (d & 0x80) {
- DrawSync(0);
- CommandDma();
- }
- }
- else
- {
- if ((d&0xc000)==0x8000)
- {
- // Register write:
- int num=(d>>8)&0x1f;
- int dold=pvid->reg[num];
- int blank_on = 0;
- pvid->type=0; // register writes clear command (else no Sega logo in Golden Axe II)
- if (num > 0x0a && !(pvid->reg[1]&4)) {
- elprintf(EL_ANOMALY, "%02x written to reg %02x in SMS mode @ %06x", d, num, SekPc);
- return;
- }
- if (num == 1 && !(d&0x40) && SekCyclesDone() - Pico.t.m68c_line_start <= 488-390)
- blank_on = 1;
- DrawSync(blank_on);
- pvid->reg[num]=(unsigned char)d;
- switch (num)
- {
- case 0x00:
- elprintf(EL_INTSW, "hint_onoff: %i->%i [%u] pend=%i @ %06x", (dold&0x10)>>4,
- (d&0x10)>>4, SekCyclesDone(), (pvid->pending_ints&0x10)>>4, SekPc);
- goto update_irq;
- case 0x01:
- elprintf(EL_INTSW, "vint_onoff: %i->%i [%u] pend=%i @ %06x", (dold&0x20)>>5,
- (d&0x20)>>5, SekCyclesDone(), (pvid->pending_ints&0x20)>>5, SekPc);
- if (!(pvid->status & PVS_VB2))
- pvid->status &= ~SR_VB;
- pvid->status |= ((d >> 3) ^ SR_VB) & SR_VB; // forced blanking
- goto update_irq;
- case 0x05:
- //elprintf(EL_STATUS, "spritep moved to %04x", (unsigned)(Pico.video.reg[5]&0x7f) << 9);
- if (d^dold) Pico.est.rendstatus |= PDRAW_SPRITES_MOVED;
- break;
- case 0x0c:
- // renderers should update their palettes if sh/hi mode is changed
- if ((d^dold)&8) Pico.m.dirtyPal = 2;
- break;
- }
- return;
- update_irq:
- #ifndef EMU_CORE_DEBUG
- // update IRQ level
- if (!SekShouldInterrupt()) // hack
- {
- int lines, pints, irq = 0;
- lines = (pvid->reg[1] & 0x20) | (pvid->reg[0] & 0x10);
- pints = pvid->pending_ints & lines;
- if (pints & 0x20) irq = 6;
- else if (pints & 0x10) irq = 4;
- SekInterrupt(irq); // update line
- // this is broken because cost of current insn isn't known here
- if (irq) SekEndRun(21); // make it delayed
- }
- #endif
- }
- else
- {
- // High word of command:
- pvid->command&=0x0000ffff;
- pvid->command|=d<<16;
- pvid->pending=1;
- }
- }
- break;
- // case 0x08: // 08 0a - HV counter - lock up
- // case 0x0c: // 0c 0e - HV counter - lock up
- // case 0x10: // 10 12 - PSG - handled by caller
- // case 0x14: // 14 16 - PSG - handled by caller
- // case 0x18: // 18 1a - no effect?
- case 0x1c: // 1c 1e - debug
- pvid->debug = d;
- pvid->debug_p = 0;
- if (d & (1 << 6)) {
- pvid->debug_p |= PVD_KILL_A | PVD_KILL_B;
- pvid->debug_p |= PVD_KILL_S_LO | PVD_KILL_S_HI;
- }
- switch ((d >> 7) & 3) {
- case 1:
- pvid->debug_p &= ~(PVD_KILL_S_LO | PVD_KILL_S_HI);
- pvid->debug_p |= PVD_FORCE_S;
- break;
- case 2:
- pvid->debug_p &= ~PVD_KILL_A;
- pvid->debug_p |= PVD_FORCE_A;
- break;
- case 3:
- pvid->debug_p &= ~PVD_KILL_B;
- pvid->debug_p |= PVD_FORCE_B;
- break;
- }
- break;
- }
- }
- static u32 SrLow(const struct PicoVideo *pv)
- {
- unsigned int c, d = pv->status;
- c = SekCyclesDone() - Pico.t.m68c_line_start - 39;
- if (c < 92)
- d |= SR_HB;
- return d;
- }
- PICO_INTERNAL_ASM unsigned int PicoVideoRead(unsigned int a)
- {
- a &= 0x1c;
- if (a == 0x04) // control port
- {
- struct PicoVideo *pv = &Pico.video;
- unsigned int d = SrLow(pv);
- pv->pending = 0;
- elprintf(EL_SR, "SR read: %04x [%u] @ %06x", d, SekCyclesDone(), SekPc);
- return d;
- }
- // H-counter info (based on Generator):
- // frame:
- // | <- hblank? -> |
- // start <416> hint <36> hdisplay <38> end // CPU cycles
- // |---------...---------|------------|-------------|
- // 0 B6 E4 FF // 40 cells
- // 0 93 E8 FF // 32 cells
- // Gens (?) v-render
- // start <hblank=84> hint hdisplay <404> |
- // |---------------------|--------------------------|
- // E4 (hc[0x43]==0) 07 B1 // 40
- // E8 (hc[0x45]==0) 05 91 // 32
- // check: Sonic 3D Blast bonus, Cannon Fodder, Chase HQ II, 3 Ninjas kick back, Road Rash 3, Skitchin', Wheel of Fortune
- if ((a&0x1c)==0x08)
- {
- unsigned int d;
- d = (SekCyclesDone() - Pico.t.m68c_line_start) & 0x1ff; // FIXME
- if (Pico.video.reg[12]&1)
- d = hcounts_40[d];
- else d = hcounts_32[d];
- elprintf(EL_HVCNT, "hv: %02x %02x [%u] @ %06x", d, Pico.video.v_counter, SekCyclesDone(), SekPc);
- return d | (Pico.video.v_counter << 8);
- }
- if (a==0x00) // data port
- {
- return VideoRead();
- }
- return 0;
- }
- unsigned char PicoVideoRead8DataH(void)
- {
- return VideoRead() >> 8;
- }
- unsigned char PicoVideoRead8DataL(void)
- {
- return VideoRead();
- }
- unsigned char PicoVideoRead8CtlH(void)
- {
- u8 d = (u8)(Pico.video.status >> 8);
- Pico.video.pending = 0;
- elprintf(EL_SR, "SR read (h): %02x @ %06x", d, SekPc);
- return d;
- }
- unsigned char PicoVideoRead8CtlL(void)
- {
- u8 d = SrLow(&Pico.video);
- Pico.video.pending = 0;
- elprintf(EL_SR, "SR read (l): %02x @ %06x", d, SekPc);
- return d;
- }
- unsigned char PicoVideoRead8HV_H(void)
- {
- elprintf(EL_HVCNT, "vcounter: %02x [%u] @ %06x", Pico.video.v_counter, SekCyclesDone(), SekPc);
- return Pico.video.v_counter;
- }
- // FIXME: broken
- unsigned char PicoVideoRead8HV_L(void)
- {
- u32 d = (SekCyclesDone() - Pico.t.m68c_line_start) & 0x1ff; // FIXME
- if (Pico.video.reg[12]&1)
- d = hcounts_40[d];
- else d = hcounts_32[d];
- elprintf(EL_HVCNT, "hcounter: %02x [%u] @ %06x", d, SekCyclesDone(), SekPc);
- return d;
- }
- // vim:shiftwidth=2:ts=2:expandtab
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