Feature/add some kstdlib functions

.gitignore

@@ -54,3 +54,6 @@ dkms.conf
 /isodir
 serial.log
 *.cpio
+
+# Auxilar files
+.vscode/

kernel/include/kstdint.h

@@ -1,14 +1,41 @@
 #ifndef __K_STDINT
 #define __K_STDINT
 
-typedef char int8_t;
-typedef short int16_t;
-typedef int int32_t;
+// unsigned types
+typedef unsigned long long uint64_t;
+typedef unsigned int       uint32_t;
+typedef unsigned short     uint16_t;
+typedef unsigned char      uint8_t;
+
+typedef uint64_t u64;
+typedef uint32_t u32;
+typedef uint16_t u16;
+typedef uint8_t  u8;
+
+// signed types
 typedef long long int64_t;
+typedef int       int32_t;
+typedef short     int16_t;
+typedef char      int8_t;
 
-typedef unsigned char uint8_t;
-typedef unsigned short uint16_t;
-typedef unsigned int uint32_t;
-typedef unsigned long long uint64_t;
+typedef int64_t i64;
+typedef int32_t i32;
+typedef int16_t i16;
+typedef int8_t  i8;
+
+// floating point types
+typedef double f64;
+typedef float  f32;
+
+// other
+typedef int64_t  ssize_t;
+typedef uint64_t size_t;
+
+typedef i64 ssize;
+typedef u64 usize;
+
+// memory manager
+typedef u32 phys_addr_t;
+typedef u32 virt_addr_t;
 
 #endif

kernel/include/kstdlib.h

@@ -1,6 +1,78 @@
 #ifndef __K_STDLIB
 #define __K_STDLIB
 
+#include <kstdint.h>
+
+
+#define BITS_PER_BYTE 8
+
+/** @brief Ignore unused variable/static function.*/
 #define IGNORE_UNUSED(x) ((void)x)
 
+/**
+ * @brief Convert bits to bytes.
+ *
+ * @param [in] n - given number of bits.
+ * @return number of bytes needed for containing n bits.
+ */
+static inline usize bits_to_bytes(usize n)
+{
+    // assuming that a byte contains 8 bits
+    return (n + 7) >> 3;
+}
+
+/**
+ * @brief Convert bytes to bits.
+ *
+ * @param [in] n - given number of bytes.
+ * @return number of bits in n bytes.
+ */
+static inline usize bytes_to_bits(usize n)
+{
+    // assuming that a byte contains 8 bits
+    return n << 3;
+}
+
+/**
+ * @brief Get number of bits in value.
+ *
+ * @param [in] x - given value to count.
+ * @return number of bits in value.
+ */
+#define BITS_PER_TYPE(x) (bytes_to_bits(sizeof(x)))
+
+/**
+ * @brief Set the specific bit of given value.
+ *
+ * @param [out] value - given value to change.
+ * @param [in] pos - given bit position to set.
+ */
+static inline void set_bit(u32* value, i32 pos)
+{
+    *value |= (1U << pos);
+}
+
+/**
+ * @brief Clear the specific bit of given value.
+ *
+ * @param [out] value - given value to change.
+ * @param [in] pos - given bit position to clear.
+ */
+static inline void clear_bit(u32* value, i32 pos)
+{
+    *value &= ~(1U << pos);
+}
+
+/**
+ * @brief Get the specific bit of given value.
+ *
+ * @param [in] value - given value to test.
+ * @param [in] pos - given bit position to test.
+ * @return true if the bit is set, false otherwise.
+ */
+static inline bool test_bit(u32 value, i32 pos)
+{
+    return (value & (1U << pos)) != 0;
+}
+
 #endif