sylveos

commit 15f260c0eab9b264cd5567ee09abd70fb0c1663e
parent 5c5f944979e33e81bfc9a60d0b50f88a63820ebc
Author: Sylvia Ivory <git@sivory.net>
Date:   Wed,  4 Feb 2026 19:40:59 -0800

Fix barrier operation

Diffstat:
M
pi/mem.zig
 | 
13
++++++++++---

1 file changed, 10 insertions(+), 3 deletions(-)
diff --git a/pi/mem.zig b/pi/mem.zig
@@ -17,6 +17,11 @@ inline fn dmb() void {
     );
 }
 
+// Prevents the compiler reordering statements
+inline fn compiler_barrier() void {
+    asm volatile ("" ::: .{ .memory = true });
+}
+
 const BarrierKind = enum {
     Strict,
     Weak,
@@ -25,12 +30,14 @@ const BarrierKind = enum {
 const Operation = enum {
     Read,
     Write,
+    Compiler,
 };
 
-pub inline fn barrier(op: Operation) void {
+pub inline fn barrier(comptime op: Operation) void {
     switch (op) {
-        .Write => dmb(),
-        .Read => dsb(),
+        .Write => dsb(),
+        .Read => dmb(),
+        .Compiler => compiler_barrier(),
     }
 }