system.h

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#ifndef _CORE_SYSTEM_H
#define _CORE_SYSTEM_H
 
/* What nearly every kernel file needs: small macros, the compiler's
 * attributes, the basic types, printk() and kmalloc(). */
 
/* A bit's value, the larger or smaller of two values, a value without
 * its sign. */
#define _BV(b) (1 << (b))
#define MAX(a, b) ((a) > (b) ? (a) : (b))
#define MIN(a, b) ((a) < (b) ? (a) : (b))
#define ABS(a) ((a) < 0? -(a) : (a))
 
/* The size of a structure's member. */
#define MEMBER_SIZE(type, member) (sizeof(((type *)0)->member))
 
/* Marks what may be unused, without a warning (not with every
 * compiler). */
#if defined(__TINYC__) || defined(__clang__) || defined(__PCC__)
  #undef __unused
  #define __unused
#else
  #ifndef __unused
    #define __unused    __attribute__((unused))
  #endif
#endif
 
 
/* A structure with no padding, aligned data, data in a given section. */
#define __packed     __attribute__((packed))
#define __aligned(n) __attribute__((aligned(n)))
#define __section(s) __attribute__((section(s)))
 
#if defined(__TINYC__) || defined(__PCC__)
#include <stddef.h>
#else
#include_next <stddef.h>
#include_next <stdint.h>
#endif
 
#include <core/printk.h>
#include <mm/kvmem.h>
 
#include <config.h>
#include <core/types.h>
 
#endif /* ! _CORE_SYSTEM_H */