chore: change directory structure

src/core/bus/Iwram.zig

@@ -0,0 +1,40 @@
+const std = @import("std");
+
+const Allocator = std.mem.Allocator;
+const iwram_size = 0x8000;
+const Self = @This();
+
+buf: []u8,
+alloc: Allocator,
+
+pub fn init(alloc: Allocator) !Self {
+    const buf = try alloc.alloc(u8, iwram_size);
+    std.mem.set(u8, buf, 0);
+
+    return Self{
+        .buf = buf,
+        .alloc = alloc,
+    };
+}
+
+pub fn deinit(self: Self) void {
+    self.alloc.free(self.buf);
+}
+
+pub fn read(self: *const Self, comptime T: type, address: usize) T {
+    const addr = address & 0x7FFF;
+
+    return switch (T) {
+        u32, u16, u8 => std.mem.readIntSliceLittle(T, self.buf[addr..][0..@sizeOf(T)]),
+        else => @compileError("IWRAM: Unsupported read width"),
+    };
+}
+
+pub fn write(self: *const Self, comptime T: type, address: usize, value: T) void {
+    const addr = address & 0x7FFF;
+
+    return switch (T) {
+        u32, u16, u8 => std.mem.writeIntSliceLittle(T, self.buf[addr..][0..@sizeOf(T)], value),
+        else => @compileError("IWRAM: Unsupported write width"),
+    };
+}