diff --git a/hf_call.c b/hf_call.c
index 53245be..ef263a4 100644
--- a/hf_call.c
+++ b/hf_call.c
@@ -16,6 +16,7 @@
  */
 
 #include "hf/call.h"
+#include "hf/spci.h"
 #include "hf/types.h"
 
 int64_t hf_call(uint64_t arg0, uint64_t arg1, uint64_t arg2, uint64_t arg3)
@@ -35,3 +36,30 @@
 
 	return r0;
 }
+
+struct spci_value spci_call(struct spci_value args)
+{
+	register uint64_t r0 __asm__("x0") = args.func;
+	register uint64_t r1 __asm__("x1") = args.arg1;
+	register uint64_t r2 __asm__("x2") = args.arg2;
+	register uint64_t r3 __asm__("x3") = args.arg3;
+	register uint64_t r4 __asm__("x4") = args.arg3;
+	register uint64_t r5 __asm__("x5") = args.arg3;
+	register uint64_t r6 __asm__("x6") = args.arg3;
+	register uint64_t r7 __asm__("x7") = args.arg3;
+
+	__asm__ volatile(
+		"hvc #0"
+		: /* Output registers, also used as inputs ('+' constraint). */
+		"+r"(r0), "+r"(r1), "+r"(r2), "+r"(r3), "+r"(r4), "+r"(r5),
+		"+r"(r6), "+r"(r7));
+
+	return (struct spci_value){.func = r0,
+				   .arg1 = r1,
+				   .arg2 = r2,
+				   .arg3 = r3,
+				   .arg4 = r4,
+				   .arg5 = r5,
+				   .arg6 = r6,
+				   .arg7 = r7};
+}