Implement memory device

The memory device is fully implemented, with 3MB of heap memory.

This commit is a bit messy, additional changes are:
- The program memory and program counter in each Bedrock struct have
  been moved to a dedicated struct to prevent a name collision with the
  memory device
- The run_bg and debug functions have been moved to core.c and debug.c
- The blank screen colour has been changed back to black
- No second program runs on the sub screen by default
- The number of Bedrock instances to run has been parameterized

1 files changed, 42 insertions, 0 deletions

diff --git a/arm9/source/devices/memory.h b/arm9/source/devices/memory.h
new file mode 100644
index 0000000..0abff16
--- /dev/null
+++ b/arm9/source/devices/memory.h
@@ -0,0 +1,42 @@
+#ifndef MEMORY_H_
+    #define MEMORY_H_
+
+    #define HEAP_SIZE (4096*3)
+
+    typedef struct {
+        u8 id;           // Unique non-zero identifier for this memory device.
+
+        u16 offset1;     // Bedrock offset value for head 1
+        u8 page1;        // Bedrock address value for head 1
+        u8 byte1;        // Bedrock address value for head 1
+        u16 offset2;     // Bedrock offset value for head 2
+        u8 page2;        // Bedrock address value for head 2
+        u8 byte2;        // Bedrock address value for head 2
+
+        u16 count_write;  // write cache for page count
+        u16 count;        // number of pages allocated for this bedrock
+        u16 copy_write;   // write cache for page copy length
+
+        u8 *point1;     // pointer to current page for head 1
+        u8 *point2;     // pointer to current page for head 2
+
+        u8* cache1[256];
+        u8* cache2[256];
+    } MemoryDevice ;
+
+    u8 mem_read1(MemoryDevice *mem);
+    u8 mem_read2(MemoryDevice *mem);
+    void mem_write1(MemoryDevice *mem, u8 value);
+    void mem_write2(MemoryDevice *mem, u8 value);
+
+    void mem_load_cache1(MemoryDevice *mem);
+    void mem_load_cache2(MemoryDevice *mem);
+    void mem_get_page1(MemoryDevice *mem);
+    void mem_get_page2(MemoryDevice *mem);
+
+
+    void mem_allocate(MemoryDevice *mem);
+    void mem_do_copy(MemoryDevice *mem);
+
+
+#endif