added code to access MIDI and IKBD in mmu.c

BaS_gcc/include/acia.h

@@ -4,9 +4,9 @@
 /*
  * ACIA registers
  */
-#define keyctl	volatile uint8_t *0xfffc00
-#define keybd	volatile uint8_t *0xfffc02
-#define midictl	volatile uint8_t *0xfffc04
-#define midi	volatile uint8_t *0xfffc06
+#define keyctl	0xfffc00
+#define keybd	0xfffc02
+#define midictl	0xfffc04
+#define midi	0xfffc06
 
 #endif /* _ACIA_H_ */

BaS_gcc/sources/mmu.c

@@ -1,4 +1,5 @@
 #include "mmu.h"
+#include "acia.h"
 
 /*
  * mmu.c
@@ -365,6 +366,21 @@ void mmutr_miss(void)
 	debug_print("MMU TLB MISS at 0x%08x\r\n", address);
 	flush_and_invalidate_caches();
 
+	switch (address)
+	{
+		case keyctl:
+		case keybd:
+			/* do something to emulate the IKBD access */
+			debug_print("IKBD access\r\n");
+			break;
+
+		case midictl:
+		case midi:
+			/* do something to emulate MIDI access */
+			debug_print("MIDI ACIA access\r\n");
+			break;
+
+		default:
 			/* add missed page to TLB */
 			MCF_MMU_MMUTR = (address & 0xfff00000) | /* virtual aligned to 1M */
 							MCF_MMU_MMUTR_SG |		/* shared global */
@@ -384,6 +400,7 @@ void mmutr_miss(void)
 							MCF_MMU_MMUOR_ACC |     /* access TLB */
 							MCF_MMU_MMUOR_UAA;      /* update allocation address field */
 	}
+}