#ifndef COMMON__H
#define COMMON__H

#include <stdint.h>
#include <stddef.h>
#include <assert.h>

#define WEAK __attribute__((weak))
#define NORETURN __attribute__((noreturn))

#ifndef static_assert
#define static_assert(a, b)
#endif

/* Define __IO to be volatile if it's not already. */
#ifndef __IO
#define __IO volatile
#endif

#define CTZ(n) __builtin_ctz(n)

#define bool int
#ifndef __cplusplus
#define true 1
#define false 0
#endif

#define PACKED __attribute__((packed))
#define BIT(n) (1 << (n))

#define RESERVED_CONCAT_IMPL(x, y) x ## y
#define RESERVED_MACRO_CONCAT(x, y) RESERVED_CONCAT_IMPL(x, y)
#define RESERVED(n) \
  bits_t RESERVED_MACRO_CONCAT(_r, __COUNTER__) :n
  
#define RESERVE(type) \
  __IO type RESERVED_MACRO_CONCAT(_r, __COUNTER__)

#define ptr2reg(ptr) \
  ((uint32_t) (ptrdiff_t) (ptr))

typedef __IO uint32_t bits_t;

#define regset(reg, mask, val) \
  ((reg) = ((reg) & ~mask) | (val << CTZ(mask)))

#endif /* COMMON_H */