hack for bios write disable thing

[pcsx_rearmed.git] / libpcsxcore / new_dynarec / pcsxmem.c

diff --git a/libpcsxcore/new_dynarec/pcsxmem.c b/libpcsxcore/new_dynarec/pcsxmem.c
index a323c18..f5a78ff 100644 (file)
--- a/libpcsxcore/new_dynarec/pcsxmem.c
+++ b/libpcsxcore/new_dynarec/pcsxmem.c
@@ -15,6 +15,8 @@
 //#define memprintf printf
 #define memprintf(...)
 
+static int ram_is_ro;
+
 static void read_mem8()
 {
        memprintf("ari64_read_mem8  %08x @%08x %u\n", address, psxRegs.pc, psxRegs.cycle);
@@ -89,6 +91,32 @@ void (*writemem[0x10000])();
 void (*writememb[0x10000])();
 void (*writememh[0x10000])();
 
+static void write_mem_check_ro32()
+{
+       if (!ram_is_ro)
+               *(u32 *)(address | 0x80000000) = word;
+}
+
+static void write_biu()
+{
+       memprintf("write_biu %08x, %08x @%08x %u\n", address, word, psxRegs.pc, psxRegs.cycle);
+
+       if (address != 0xfffe0130)
+               return;
+
+       switch (word) {
+       case 0x800: case 0x804:
+               ram_is_ro = 1;
+               break;
+       case 0: case 0x1e988:
+               ram_is_ro = 0;
+               break;
+       default:
+               memprintf("write_biu: unexpected val: %08x\n", word);
+               break;
+       }
+}
+
 /* IO handlers */
 static u32 io_read_sio16()
 {
@@ -313,6 +341,10 @@ void new_dyna_pcsx_mem_init(void)
                writemem[i]  = writemem [0x8000|i] = writemem [0xa000|i] = ari_write_ram_mirror32;
        }
 
+       // stupid BIOS RAM check
+       writemem[0] = write_mem_check_ro32;
+       ram_is_ro = 0;
+
        // RAM direct
        for (i = 0x8000; i < 0x8020; i++) {
                readmemb[i] = ari_read_ram8;
@@ -338,7 +370,7 @@ void new_dyna_pcsx_mem_init(void)
        writememh[0x1f80] = ari_write_io16;
        writemem[0x1f80]  = ari_write_io32;
 
-       writemem[0xfffe] = write_mem32;
+       writemem[0xfffe] = write_biu;
 #endif
 
        // fill IO tables