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, 14 insertions, 6 deletions

diff --git a/arm9/source/core.h b/arm9/source/core.h
index e5494ca..916806c 100644
--- a/arm9/source/core.h
+++ b/arm9/source/core.h
@@ -6,11 +6,12 @@
     #include "devices/math.h"
     #include "devices/screen.h"
     #include "devices/system.h"
+    #include "devices/memory.h"
 
     #define WST           br->wst
     #define RST           br->rst
-    #define MEM           br->mem
-    #define PC            br->pc
+    #define MEM           br->prg.mem
+    #define PC            br->prg.p
 
     #define WSTV(i)       WST.mem[WST.p+(i)]
     #define RSTV(i)       RST.mem[RST.p+(i)]
@@ -58,17 +59,23 @@
     } Signal;
 
     typedef struct {
+        u8 mem [65536];
+        u16 p;
+    } ProgramMemory;
+
+    typedef struct {
         u8 mem[256];            // stack memory
         u8 p;                   // stack pointer
-    } Stack;
+    } StackMemory;
 
     typedef struct {
         bool alive;             // true when program is loaded
         bool awake;             // true when program is not asleep
-        u8 mem[65536];          // program memory
-        u16 pc;                 // program counter
-        Stack wst, rst;         // working and return stacks
+        ProgramMemory prg;     // program memory
+        StackMemory wst, rst;   // working and return stacks
+
         SystemDevice sys;
+        MemoryDevice mem;
         MathDevice math;
         ClockDevice clk;
         InputDevice inp;
@@ -77,6 +84,7 @@
 
     void reset_br(Bedrock *br);
     void start_br(Bedrock *br, u8 program[], int size);
+    void run_br(Bedrock *br);
     void rouse_br(Bedrock *br);
     u8 dev_read(Bedrock *br, u8 port);
     Signal dev_write(Bedrock *br, u8 port, u8 val);