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-rw-r--r--cortex_m/critical_section.h21
1 files changed, 21 insertions, 0 deletions
diff --git a/cortex_m/critical_section.h b/cortex_m/critical_section.h
new file mode 100644
index 0000000..6b611a8
--- /dev/null
+++ b/cortex_m/critical_section.h
@@ -0,0 +1,21 @@
+#pragma once
+
+#include <cstdint>
+
+struct critical_section {
+ uint32_t primask;
+
+ critical_section() {
+ asm volatile("mrs %0, primask" : "=r" (primask));
+
+ asm volatile("cpsid i");
+
+ asm volatile("dmb");
+ }
+
+ ~critical_section() {
+ asm volatile("dmb");
+
+ asm volatile("msr primask, %0" :: "r" (primask));
+ }
+};