psxbios: experimental vsync HLE

[pcsx_rearmed.git] / libpcsxcore / psxbios.c

diff --git a/libpcsxcore/psxbios.c b/libpcsxcore/psxbios.c
index b370966..bad3457 100644 (file)
--- a/libpcsxcore/psxbios.c
+++ b/libpcsxcore/psxbios.c
@@ -36,6 +36,7 @@
 #include "sio.h"
 #include "psxhle.h"
 #include "psxinterpreter.h"
+#include "new_dynarec/events.h"
 #include <zlib.h>
 
 #ifndef PSXBIOS_LOG
@@ -3330,6 +3331,8 @@ void psxBiosInit() {
        int i;
        uLongf len;
 
+       psxRegs.biosBranchCheck = ~0;
+
        memset(psxM, 0, 0x10000);
        for(i = 0; i < 256; i++) {
                biosA0[i] = NULL;
@@ -4172,6 +4175,74 @@ void (* const psxHLEt[24])() = {
        hleExcPadCard1, hleExcPadCard2,
 };
 
+void psxBiosCheckExe(u32 t_addr, u32 t_size)
+{
+       // lw      $v0, 0x10($sp)
+       // nop
+       // addiu   $v0, -1
+       // sw      $v0, 0x10($sp)
+       // lw      $v0, 0x10($sp)
+       // nop
+       // bne     $v0, $v1, not_timeout
+       // nop
+       // lui     $a0, ...
+       static const u8 pattern[] = {
+               0x10, 0x00, 0xA2, 0x8F, 0x00, 0x00, 0x00, 0x00,
+               0xFF, 0xFF, 0x42, 0x24, 0x10, 0x00, 0xA2, 0xAF,
+               0x10, 0x00, 0xA2, 0x8F, 0x00, 0x00, 0x00, 0x00,
+               0x0C, 0x00, 0x43, 0x14, 0x00, 0x00, 0x00, 0x00,
+       };
+       u32 start = t_addr & 0x1ffffc;
+       u32 end = (start + t_size) & 0x1ffffc;
+       u32 buf[sizeof(pattern) / sizeof(u32)];
+       const u32 *r32 = (u32 *)(psxM + start);
+       u32 i, j;
+
+       if (end <= start)
+               return;
+       if (!Config.HLE)
+               return;
+
+       memcpy(buf, pattern, sizeof(buf));
+       for (i = 0; i < t_size / 4; i += j + 1) {
+               for (j = 0; j < sizeof(buf) / sizeof(buf[0]); j++)
+                       if (r32[i + j] != buf[j])
+                               break;
+               if (j != sizeof(buf) / sizeof(buf[0]))
+                       continue;
+
+               if ((SWAP32(r32[i + j]) >> 16) != 0x3c04) // lui
+                       continue;
+               SysPrintf("HLE vsync @%08x\n", start + i * 4);
+               psxRegs.biosBranchCheck = (t_addr & 0xa01ffffc) + i * 4;
+       }
+}
+
+void psxBiosCheckBranch(void)
+{
+#if 1
+       // vsync HLE hack
+       static u32 cycles_prev, v0_prev;
+       u32 cycles_passed, waste_cycles;
+       u32 loops, v0_expect = v0_prev - 1;
+       if (v0 != 1)
+               return;
+       execI(&psxRegs);
+       cycles_passed = psxRegs.cycle - cycles_prev;
+       cycles_prev = psxRegs.cycle;
+       v0_prev = v0;
+       if (cycles_passed < 10 || cycles_passed > 50 || v0 != v0_expect)
+               return;
+
+       waste_cycles = schedule_timeslice() - psxRegs.cycle;
+       loops = waste_cycles / cycles_passed;
+       if (loops > v0)
+               loops = v0;
+       v0 -= loops;
+       psxRegs.cycle += loops * cycles_passed;
+       //printf("c %4u %d\n", loops, cycles_passed);
+#endif
+}
 
 #define bfreeze(ptr, size) { \
        if (Mode == 1) memcpy(&psxR[base], ptr, size); \