New utils CLAMP function

Also includes associted unittest.

Author: coderarjob

include/utils.h

@@ -97,3 +97,6 @@
     #define ARCH_ENABLE_INTERRUPTS()  (void)0
     #define ARCH_DISABLE_INTERRUPTS() (void)0
 #endif
+
+// Clamp value to lower & upper bounds
+#define CLAMP(v, l, u) (v < l) ? l : (v >= u) ? u : v

src/unittests/kernel/utils_test.c

@@ -4,6 +4,14 @@
 #include <unittest/unittest.h>
 #include <types.h>
 
+TEST (utils, clamp)
+{
+    EQ_SCALAR (CLAMP (0, 0, 0), 0);
+    EQ_SCALAR (CLAMP (-10, 1, 2), 1);
+    EQ_SCALAR (CLAMP (10, 1, 2), 2);
+    END();
+}
+
 TEST (utils, bit_set)
 {
     EQ_SCALAR (BIT_SET (0x10, 0), 0b00010001);
@@ -196,4 +204,5 @@ int main() {
     bytes_to_pageframes_floor();
     bit_set();
     bit_clear();
+    clamp();
 }