dma: don't copy out of range

[pcsx_rearmed.git] / libpcsxcore / psxdma.h

diff --git a/libpcsxcore/psxdma.h b/libpcsxcore/psxdma.h
index 28495fa..eaddb38 100644 (file)
--- a/libpcsxcore/psxdma.h
+++ b/libpcsxcore/psxdma.h
@@ -79,6 +79,17 @@ void gpuInterrupt();
 void spuInterrupt();
 void gpuotcInterrupt();
 
+static inline void *getDmaRam(u32 madr, u32 *max_words)
+{
+       // this should wrap instead of limit
+       if (!(madr & 0x800000)) {
+               madr &= 0x1ffffc;
+               *max_words = (0x200000 - madr) / 4;
+               return psxM + madr;
+       }
+       return INVALID_PTR;
+}
+
 #ifdef __cplusplus
 }
 #endif