x86_64: avoid locking bus when unnecessary

lux-operating-system · Oct 8, 2024 · 2c004a5 · 2c004a5
1 parent b0e006a
commit 2c004a5
Showing 1 changed file with 9 additions and 0 deletions.
diff --git a/src/platform/x86_64/lock.asm b/src/platform/x86_64/lock.asm
@@ -72,6 +72,15 @@ acquireLockBlocking:
 global releaseLock
 align 16
 releaseLock:
+    pushfq
+    cli
+
     xor rax, rax
+    test dword [rdi], 1
+    jz .done
+
     mov [rdi], eax
+
+.done:
+    popfq
     ret