From bb1aa5958d1b67707dcf0f6b08bfaf0b408bd46e Mon Sep 17 00:00:00 2001
From: Ben Bridle <ben@derelict.engineering>
Date: Fri, 19 Sep 2025 13:17:14 +1200
Subject: Massive rewrite

This commit rewrites the emulator halfway from scratch to make it
easier to change and maintain in the future. The emulator core was
rewritten to adhere to the released Bedrock specification (earlier
versions implemented an older prototype specification, which is no
longer relevant).

This commit also adds proper support for running multiple concurrent
Bedrock instances. This was previously supported in a limited manner
for the on-screen keyboard, but now works for any regular program as
well, with switching being performed by pressing the L or R bumper
buttons. This is disabled by default, as programs will still need to
be baked into the emulator and hand-loaded.
---
 arm9/source/dev.h | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 arm9/source/dev.h

(limited to 'arm9/source/dev.h')

diff --git a/arm9/source/dev.h b/arm9/source/dev.h
new file mode 100644
index 0000000..272baea
--- /dev/null
+++ b/arm9/source/dev.h
@@ -0,0 +1,49 @@
+#ifndef DEV_H_
+    #define DEV_H_
+
+    #include "devices/system.h"
+    #include "devices/memory.h"
+    #include "devices/math.h"
+    #include "devices/clock.h"
+    #include "devices/input.h"
+    #include "devices/screen.h"
+    #include "devices/stream.h"
+    #include "devices/file.h"
+
+
+    // Signals that can be emitted by a device.
+    typedef enum {
+        SIG_NONE = 0,
+        SIG_HALT,
+        SIG_DB1,
+        SIG_DB2,
+        SIG_DB3,
+        SIG_DB4,
+        SIG_DB5,
+        SIG_DB6,
+        SIG_SLEEP,
+        SIG_RESET,
+        SIG_FORK,
+    } Signal;
+
+    // Bedrock device bus.
+    typedef struct {
+        SystemDevice  system;
+        MemoryDevice  memory;
+        MathDevice      math;
+        ClockDevice    clock;
+        InputDevice    input;
+        ScreenDevice  screen;
+        StreamDevice  stream;
+        FileDevice      file;
+    } DeviceBus;
+
+    // Methods.
+    void dev_reset(DeviceBus *d);
+    u8 dev_read(DeviceBus *d, u8 port);
+    Signal dev_write(DeviceBus *d, u8 port, u8 v);
+
+    // Duplicate declarations from main.
+    void open_keyboard(void);
+    void close_keyboard(void);
+#endif
-- 
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