emulator uses a bus now in the cpu, ROM, RAM and VIA (7-seg) are devices connected to the bus

1 files changed, 43 insertions, 32 deletions

diff --git a/emu/memory.c b/emu/memory.c
index 408e621..52332e3 100644
--- a/emu/memory.c
+++ b/emu/memory.c
@@ -1,52 +1,63 @@
 #include "memory.h"
 
 #include <stdio.h>
+#include <stdlib.h>
 
-void memory_init( memory_t *memory, seg7_t *seg )
-{
-	memory->read = memory_read;
-	memory->write = memory_write;
-	memory->seg = seg;
-}
+static device_vtable_t const memory_vtable = {
+	memory_read,
+	memory_write,
+	memory_deinit
+};
 
-uint8_t memory_read( memory_t *memory, uint16_t addr )
+void memory_init( memory_t *memory, memory_type_t type, uint16_t addr, uint16_t size )
 {
-	if( addr <= 0x3FFF ) {
-		// RAM access
-		return memory->cell[addr];
-	} else if( addr <= 0x8000 ) {
-		return seg7_read( memory->seg, addr );
-	} else {
-		// ROM access
-		return memory->cell[addr];
-	}
-}
+	device_init( &memory->base, ( type == MEMORY_ROM ) ? "ROM" : "RAM" );
 
-void memory_write( memory_t *memory, uint16_t addr, uint8_t data )
-{
-	if( addr <= 0x3FFF ) {
-		// RAM access
-		memory->cell[addr] = data;
-	} else if( addr <= 0x8000 ) {
-		seg7_write( memory->seg, addr, data );
-	} else {
-		// ignore writes to ROM
-	}
+	memory->type = type;
+	memory->addr = addr;
+	memory->size = size;
+	memory->cell = malloc( memory->size );
+	memory->base.vtable = (device_vtable_t *)&memory_vtable;
 }
 
-void memory_load( memory_t *memory, uint16_t addr, uint16_t size, const char *filename )
+void memory_load( memory_t *memory, const char *filename )
 {
-	if( addr >= 0x8000 ) {
+	if( memory->type == MEMORY_ROM ) {
 		FILE *f = fopen( filename, "rb" );
 		if( f == NULL ) {
 			fprintf( stderr, "ERROR: Unable to open ROM file '%s'\n", filename );
 			exit( EXIT_FAILURE );
 		}
-		fread( &memory->cell[addr], size, 1, f );
+		fread( &memory->cell[0], memory->size, 1, f );
 		fclose( f );
 		fprintf( stderr, "INFO: Loaded firware from '%s' of size %d starting on address %04X\n",
-			filename, size, addr );
+			filename, memory->size, memory->addr );
 	} else {
-		fprintf( stderr, "ERROR: Cannot load firmware into RAM at address %04X\n", addr );
+		fprintf( stderr, "ERROR: Cannot load firmware into RAM at address %04X\n", memory->addr );
 	}
 }
+
+uint8_t memory_read( void *obj, uint16_t addr )
+{
+	memory_t *memory = (memory_t *)obj;
+	
+	return memory->cell[addr-memory->addr];
+}
+
+void memory_write( void *obj, uint16_t addr, uint8_t data )
+{
+	memory_t *memory = (memory_t *)obj;
+
+	if( memory->type && MEMORY_ROM ) {
+		// ignore writes to ROM
+	} else {
+		memory->cell[addr-memory->addr] = data;
+	}
+}
+
+void memory_deinit( void *obj )
+{
+	memory_t *memory = (memory_t *)obj;
+
+	device_deinit( &memory->base );
+}