-// SH2 internal peripherals
-// we keep them in little endian format
-static u32 sh2_peripheral_read8(u32 a, int id)
-{
- u8 *r = (void *)Pico32xMem->sh2_peri_regs[id];
- u32 d;
-
- a &= 0x1ff;
- d = PREG8(r, a);
-
- elprintf(EL_32X, "%csh2 peri r8 [%08x] %02x @%06x", id ? 's' : 'm', a | ~0x1ff, d, sh2_pc(id));
- return d;
-}
-
-static u32 sh2_peripheral_read16(u32 a, int id)
-{
- u16 *r = (void *)Pico32xMem->sh2_peri_regs[id];
- u32 d;
-
- a &= 0x1ff;
- d = r[(a / 2) ^ 1];
-
- elprintf(EL_32X, "%csh2 peri r16 [%08x] %04x @%06x", id ? 's' : 'm', a | ~0x1ff, d, sh2_pc(id));
- return d;
-}
-
-static u32 sh2_peripheral_read32(u32 a, int id)
-{
- u32 d;
- a &= 0x1fc;
- d = Pico32xMem->sh2_peri_regs[id][a / 4];
-
- elprintf(EL_32X, "%csh2 peri r32 [%08x] %08x @%06x", id ? 's' : 'm', a | ~0x1ff, d, sh2_pc(id));
- return d;
-}
-
-static int REGPARM(3) sh2_peripheral_write8(u32 a, u32 d, int id)
-{
- u8 *r = (void *)Pico32xMem->sh2_peri_regs[id];
- elprintf(EL_32X, "%csh2 peri w8 [%08x] %02x @%06x", id ? 's' : 'm', a, d, sh2_pc(id));
-
- a &= 0x1ff;
- PREG8(r, a) = d;
-
- // X-men SCI hack
- if ((a == 2 && (d & 0x20)) || // transmiter enabled
- (a == 4 && !(d & 0x80))) { // valid data in TDR
- void *oregs = Pico32xMem->sh2_peri_regs[id ^ 1];
- if ((PREG8(oregs, 2) & 0x50) == 0x50) { // receiver + irq enabled
- int level = PREG8(oregs, 0x60) >> 4;
- int vector = PREG8(oregs, 0x63) & 0x7f;
- elprintf(EL_32X, "%csh2 SCI recv irq (%d, %d)", (id ^ 1) ? 's' : 'm', level, vector);
- sh2_internal_irq(&sh2s[id ^ 1], level, vector);
- return 1;
- }
- }
- return 0;
-}
-
-static int REGPARM(3) sh2_peripheral_write16(u32 a, u32 d, int id)
-{
- u16 *r = (void *)Pico32xMem->sh2_peri_regs[id];
- elprintf(EL_32X, "%csh2 peri w16 [%08x] %04x @%06x", id ? 's' : 'm', a, d, sh2_pc(id));
-
- a &= 0x1ff;
-
- // evil WDT
- if (a == 0x80) {
- if ((d & 0xff00) == 0xa500) { // WTCSR
- PREG8(r, 0x80) = d;
- p32x_timers_recalc();
- }
- if ((d & 0xff00) == 0x5a00) // WTCNT
- PREG8(r, 0x81) = d;
- return 0;
- }
-
- r[(a / 2) ^ 1] = d;
- return 0;
-}
-
-static void sh2_peripheral_write32(u32 a, u32 d, int id)
-{
- u32 *r = Pico32xMem->sh2_peri_regs[id];
- elprintf(EL_32X, "%csh2 peri w32 [%08x] %08x @%06x", id ? 's' : 'm', a, d, sh2_pc(id));
-
- a &= 0x1fc;
- r[a / 4] = d;
-
- switch (a) {
- // division unit (TODO: verify):
- case 0x104: // DVDNT: divident L, starts divide
- elprintf(EL_32X, "%csh2 divide %08x / %08x", id ? 's' : 'm', d, r[0x100 / 4]);
- if (r[0x100 / 4]) {
- signed int divisor = r[0x100 / 4];
- r[0x118 / 4] = r[0x110 / 4] = (signed int)d % divisor;
- r[0x104 / 4] = r[0x11c / 4] = r[0x114 / 4] = (signed int)d / divisor;
- }
- else
- r[0x110 / 4] = r[0x114 / 4] = r[0x118 / 4] = r[0x11c / 4] = 0; // ?
- break;
- case 0x114:
- elprintf(EL_32X, "%csh2 divide %08x%08x / %08x @%08x",
- id ? 's' : 'm', r[0x110 / 4], d, r[0x100 / 4], sh2_pc(id));
- if (r[0x100 / 4]) {
- signed long long divident = (signed long long)r[0x110 / 4] << 32 | d;
- signed int divisor = r[0x100 / 4];
- // XXX: undocumented mirroring to 0x118,0x11c?
- r[0x118 / 4] = r[0x110 / 4] = divident % divisor;
- divident /= divisor;
- r[0x11c / 4] = r[0x114 / 4] = divident;
- divident >>= 31;
- if ((unsigned long long)divident + 1 > 1) {
- //elprintf(EL_32X, "%csh2 divide overflow! @%08x", id ? 's' : 'm', sh2_pc(id));
- r[0x11c / 4] = r[0x114 / 4] = divident > 0 ? 0x7fffffff : 0x80000000; // overflow
- }
- }
- else
- r[0x110 / 4] = r[0x114 / 4] = r[0x118 / 4] = r[0x11c / 4] = 0; // ?
- break;
- }
-
- if ((a == 0x1b0 || a == 0x18c) && (dmac0->chcr0 & 3) == 1 && (dmac0->dmaor & 1)) {
- elprintf(EL_32X, "sh2 DMA %08x -> %08x, cnt %d, chcr %04x @%06x",
- dmac0->sar0, dmac0->dar0, dmac0->tcr0, dmac0->chcr0, sh2_pc(id));
- dmac0->tcr0 &= 0xffffff;
-
- // HACK: assume 68k starts writing soon and end the timeslice
- ash2_end_run(&sh2s[id], 16);
-
- // DREQ is only sent after first 4 words are written.
- // we do multiple of 4 words to avoid messing up alignment
- if (dmac0->sar0 == 0x20004012 && Pico32x.dmac_ptr && (Pico32x.dmac_ptr & 3) == 0) {
- elprintf(EL_32X, "68k -> sh2 DMA");
- dma_68k2sh2_do();
- }
- }
-}
-
-// ------------------------------------------------------------------
-// 32x handlers