--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/sdram.c	Sat Jan 03 03:30:26 2009 +0000
@@ -0,0 +1,65 @@
+/**
+ * $Id: sdram.c 954 2008-12-26 14:25:23Z nkeynes $
+ *
+ * Dreamcast main SDRAM - access methods and timing controls. This is fairly
+ * directly coupled to the SH4
+ *
+ * Copyright (c) 2005 Nathan Keynes.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include "lxdream.h"
+#include "mem.h"
+#include "dreamcast.h"
+#include <string.h>
+
+
+static int32_t FASTCALL ext_sdram_read_long( sh4addr_t addr )
+{
+    return *((int32_t *)(dc_main_ram + (addr&0x00FFFFFF)));
+}
+static int32_t FASTCALL ext_sdram_read_word( sh4addr_t addr )
+{
+    return SIGNEXT16(*((int16_t *)(dc_main_ram + (addr&0x00FFFFFF))));
+}
+static int32_t FASTCALL ext_sdram_read_byte( sh4addr_t addr )
+{
+    return SIGNEXT8(*((int16_t *)(dc_main_ram + (addr&0x00FFFFFF))));
+}
+static void FASTCALL ext_sdram_write_long( sh4addr_t addr, uint32_t val )
+{
+    *(uint32_t *)(dc_main_ram + (addr&0x00FFFFFF)) = val;
+    xlat_invalidate_long(addr);
+}
+static void FASTCALL ext_sdram_write_word( sh4addr_t addr, uint32_t val )
+{
+    *(uint16_t *)(dc_main_ram + (addr&0x00FFFFFF)) = (uint16_t)val;
+    xlat_invalidate_word(addr);
+}
+static void FASTCALL ext_sdram_write_byte( sh4addr_t addr, uint32_t val )
+{
+    *(uint8_t *)(dc_main_ram + (addr&0x00FFFFFF)) = (uint8_t)val;
+    xlat_invalidate_word(addr);
+}
+static void FASTCALL ext_sdram_read_burst( unsigned char *dest, sh4addr_t addr )
+{
+    memcpy( dest, dc_main_ram+(addr&0x00FFFFFF), 32 );
+}
+static void FASTCALL ext_sdram_write_burst( sh4addr_t addr, unsigned char *src )
+{
+    memcpy( dc_main_ram+(addr&0x00FFFFFF), src, 32 );
+}
+
+struct mem_region_fn mem_region_sdram = { ext_sdram_read_long, ext_sdram_write_long, 
+        ext_sdram_read_word, ext_sdram_write_word, 
+        ext_sdram_read_byte, ext_sdram_write_byte, 
+        ext_sdram_read_burst, ext_sdram_write_burst };