1 files changed, 28 insertions, 0 deletions
diff --git a/include/nitro/os_system.c b/include/nitro/os_system.c
new file mode 100644
index 00000000..2ccb7fc1
--- /dev/null
+++ b/include/nitro/os_system.c
@@ -0,0 +1,28 @@
+//
+// Created by mart on 4/23/20.
+//
+
+#include "os_system.h"
+
+asm OSIntrMode OS_DisableInterrupts() {
+    mrs     r0, cpsr
+    orr     r1, r0, #HW_PSR_IRQ_DISABLE
+    msr     cpsr_c, r1
+    and     r0, r0, #HW_PSR_IRQ_DISABLE
+    bx      lr
+}
+
+asm OSIntrMode OS_RestoreInterrupts(OSIntrMode state) {
+    mrs     r1, cpsr
+    bic     r2, r1, #HW_PSR_IRQ_DISABLE
+    orr     r2, r2, r0
+    msr     cpsr_c, r2
+    and     r0, r1, #HW_PSR_IRQ_DISABLE
+    bx      lr
+}
+
+asm OSProcMode OS_GetProcMode() {
+    mrs r0, cpsr
+    and r0, r0, #HW_PSR_CPU_MODE_MASK
+    bx lr
+}
+\ No newline at end of file