[nostalgia] Restore GBA support

src/nostalgia/player/CMakeLists.txt

@@ -1,4 +1,3 @@
-
 add_executable(
 	nostalgia
 		main.cpp

src/nostalgia/player/main.cpp

@@ -16,11 +16,13 @@ using namespace nostalgia::world;
 
 ox::Error run(ox::FileSystem *fs) {
 	Context ctx;
-	oxReturnError(init(&ctx));
 	ctx.rom = fs;
-	Zone zone;
-	oxReturnError(zone.init(&ctx, Bounds{0, 0, 40, 40}, "/TileSheets/Charset.ng", "/Palettes/Charset.npal"));
-	zone.draw(&ctx);
+	oxReturnError(init(&ctx));
+	//Zone zone;
+	//oxReturnError(zone.init(&ctx, Bounds{0, 0, 40, 40}, "/TileSheets/Charset.ng", "/Palettes/Charset.npal"));
+	//zone.draw(&ctx);
+	oxReturnError(initConsole(&ctx));
+	puts(nullptr, 9 * 32 + 10, "DOPENESS!!!");
 	oxReturnError(run());
 	oxReturnError(shutdownGfx());
 	return OxError(0);
@@ -28,9 +30,14 @@ ox::Error run(ox::FileSystem *fs) {
 
 #ifndef OX_USE_STDLIB
 
-extern "C" void _start() {
-	ox::FileSystem32 fs(ox::FileStore32(loadRom(), 32 * ox::units::MB));
+int main() {
+	auto rom = loadRom();
+	if (!rom) {
+		return 1;
+	}
+	ox::FileSystem32 fs(ox::FileStore32(rom, 32 * ox::units::MB));
 	run(&fs);
+	return 0;
 }
 
 #else

src/nostalgia/player/startup.s

@@ -1,9 +1,39 @@
+	.section ".crt0","ax"
+	.global _start
+	.align
 
-_entry:
+	.arm
+	.cpu arm7tdmi
+
+_start:
+	// disable interrupts
+	//cpsid if
+	b _reset
+	.fill 156,1,0 // make room for Nintendo logo
+	.fill 16,1,0
+	.byte 0x30,0x31
 
 
-reset:
-	@ disable interrupts
-	@ cpsid if
+_initCpp:
+	// copy data
+	ldr r0,=__data_lma
+	ldr r1,=__data_start__
+	ldr r2,=__data_end__
+	// loop over data until copied
+data_copy_loop:
+	cmp r1,r2
+	ldmltia r0!,{r3}
+	stmltia r1!,{r3}
+	blt data_copy_loop
 
-@ vim:ft=arm
+_reset:
+	ldr r0,=_reset
+	ldr r1,=_initCpp
+	mov lr,r1
+	ldr sp,=__ewram_end
+	b _initCpp
+
+	.size _start, . - _start
+	.end
+
+// vim:ft=arm