1 files changed, 55 insertions, 0 deletions
diff --git a/sys/include/asm.h b/sys/include/asm.h
new file mode 100644
index 0000000..86e6354
--- /dev/null
+++ b/sys/include/asm.h
@@ -0,0 +1,55 @@
+#ifndef _ASM_H 
+#define _ASM_H 
+
+#include <stdint.h>
+
+#define SSTATUS_SIE      (1L << 1)
+
+static inline uint64_t 
+csrr_sstatus(void) 
+{
+        uint64_t x;
+        asm volatile("csrr %0, sstatus" : "=r"(x));
+        return x;
+}
+
+static inline void 
+csrw_sstatus(uint64_t x) 
+{
+        asm volatile("csrw sstatus, %0" : : "r"(x));
+}
+
+/* will enable all supervisor interrupts using the bit in sstatus */
+static inline void 
+sie_enable(void) 
+{
+        csrw_sstatus(csrr_sstatus() | SSTATUS_SIE);
+}
+
+/* will disable all supervisor interrupts by using the bitin sstatus (though sie can also be used) */
+static inline void 
+sie_disable(void) 
+{
+        csrw_sstatus(csrr_sstatus() & ~SSTATUS_SIE);
+}
+
+/* returns the status of the sie bit in sstatus 
+ * 1 if enabled, 0 if disabled.
+ * for more specific info see the sie register 
+ */
+static inline uint64_t
+sie_status() 
+{
+        return (csrr_sstatus() & SSTATUS_SIE) != 0;
+        
+}
+
+/* we use tp to store hartid */ 
+static inline uint64_t 
+read_tp(void) 
+{
+        uint64_t x;
+        asm volatile("addi %0, tp, 0" : "=r"(x));
+}
+
+#endif /* _ASM_H */