+#ifdef ICACHE_EMULATION
+/*
+Formula One 2001 :
+Use old CPU cache code when the RAM location is updated with new code (affects in-game racing)
+*/
+static u8* ICache_Addr;
+static u8* ICache_Code;
+uint32_t *Read_ICache(uint32_t pc)
+{
+ uint32_t pc_bank, pc_offset, pc_cache;
+ uint8_t *IAddr, *ICode;
+
+ pc_bank = pc >> 24;
+ pc_offset = pc & 0xffffff;
+ pc_cache = pc & 0xfff;
+
+ IAddr = ICache_Addr;
+ ICode = ICache_Code;
+
+ // cached - RAM
+ if (pc_bank == 0x80 || pc_bank == 0x00)
+ {
+ if (SWAP32(*(uint32_t *)(IAddr + pc_cache)) == pc_offset)
+ {
+ // Cache hit - return last opcode used
+ return (uint32_t *)(ICode + pc_cache);
+ }
+ else
+ {
+ // Cache miss - addresses don't match
+ // - default: 0xffffffff (not init)
+
+ // cache line is 4 bytes wide
+ pc_offset &= ~0xf;
+ pc_cache &= ~0xf;
+
+ // address line
+ *(uint32_t *)(IAddr + pc_cache + 0x0) = SWAP32(pc_offset + 0x0);
+ *(uint32_t *)(IAddr + pc_cache + 0x4) = SWAP32(pc_offset + 0x4);
+ *(uint32_t *)(IAddr + pc_cache + 0x8) = SWAP32(pc_offset + 0x8);
+ *(uint32_t *)(IAddr + pc_cache + 0xc) = SWAP32(pc_offset + 0xc);
+
+ // opcode line
+ pc_offset = pc & ~0xf;
+ *(uint32_t *)(ICode + pc_cache + 0x0) = psxMu32ref(pc_offset + 0x0);
+ *(uint32_t *)(ICode + pc_cache + 0x4) = psxMu32ref(pc_offset + 0x4);
+ *(uint32_t *)(ICode + pc_cache + 0x8) = psxMu32ref(pc_offset + 0x8);
+ *(uint32_t *)(ICode + pc_cache + 0xc) = psxMu32ref(pc_offset + 0xc);
+ }
+ }
+
+ /*
+ TODO: Probably should add cached BIOS
+ */
+ // default
+ return (uint32_t *)PSXM(pc);
+}
+#endif
+