From 0287c9a260fca6ff12e0da71bd8bfbab1b0917b9 Mon Sep 17 00:00:00 2001
From: Rekai Musuka <rekai@musuka.dev>
Date: Fri, 21 Oct 2022 05:12:53 -0300
Subject: [PATCH] fix: force align DMA transfers

---
 src/bus/dma.zig | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/bus/dma.zig b/src/bus/dma.zig
index f8f743a..c0e94c1 100644
--- a/src/bus/dma.zig
+++ b/src/bus/dma.zig
@@ -182,10 +182,12 @@ fn DmaController(comptime id: u2) type {
             const transfer_type = is_fifo or self.cnt.transfer_type.read();
             const offset: u32 = if (transfer_type) @sizeOf(u32) else @sizeOf(u16);
 
+            const mask = if (transfer_type) ~@as(u32, 3) else ~@as(u32, 1);
+
             if (transfer_type) {
-                cpu.bus.write(u32, self._dad, cpu.bus.read(u32, self._sad));
+                cpu.bus.write(u32, self._dad & mask, cpu.bus.read(u32, self._sad & mask));
             } else {
-                cpu.bus.write(u16, self._dad, cpu.bus.read(u16, self._sad));
+                cpu.bus.write(u16, self._dad & mask, cpu.bus.read(u16, self._sad & mask));
             }
 
             switch (sad_adj) {