《操作系统》的实验代码。
 
 
 
 
 

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#ifndef __LIBS_DEFS_H__
#define __LIBS_DEFS_H__
#ifndef NULL
#define NULL ((void *)0)
#endif
#define __always_inline inline __attribute__((always_inline))
#define __noinline __attribute__((noinline))
#define __noreturn __attribute__((noreturn))
#define CHAR_BIT 8
/* Represents true-or-false values */
typedef int bool;
/* Explicitly-sized versions of integer types */
typedef char int8_t;
typedef unsigned char uint8_t;
typedef short int16_t;
typedef unsigned short uint16_t;
typedef int int32_t;
typedef unsigned int uint32_t;
typedef long long int64_t;
typedef unsigned long long uint64_t;
/* *
* Pointers and addresses are 32 bits long.
* We use pointer types to represent addresses,
* uintptr_t to represent the numerical values of addresses.
* */
typedef int32_t intptr_t;
typedef uint32_t uintptr_t;
/* size_t is used for memory object sizes */
typedef uintptr_t size_t;
/* off_t is used for file offsets and lengths */
typedef intptr_t off_t;
/* used for page numbers */
typedef size_t ppn_t;
/* *
* Rounding operations (efficient when n is a power of 2)
* Round down to the nearest multiple of n
* */
#define ROUNDDOWN(a, n) ({ \
size_t __a = (size_t)(a); \
(typeof(a))(__a - __a % (n)); \
})
/* Round up to the nearest multiple of n */
#define ROUNDUP(a, n) ({ \
size_t __n = (size_t)(n); \
(typeof(a))(ROUNDDOWN((size_t)(a) + __n - 1, __n)); \
})
/* Round up the result of dividing of n */
#define ROUNDUP_DIV(a, n) ({ \
uint32_t __n = (uint32_t)(n); \
(typeof(a))(((a) + __n - 1) / __n); \
})
/* Return the offset of 'member' relative to the beginning of a struct type */
#define offsetof(type, member) \
((size_t)(&((type *)0)->member))
/* *
* to_struct - get the struct from a ptr
* @ptr: a struct pointer of member
* @type: the type of the struct this is embedded in
* @member: the name of the member within the struct
* */
#define to_struct(ptr, type, member) \
((type *)((char *)(ptr) - offsetof(type, member)))
#endif /* !__LIBS_DEFS_H__ */