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