still serv_close bug...
[mit-jos.git] / inc / types.h
blob46271786cd877ad15d643bfd3efc7511c2739a51
1 #ifndef JOS_INC_TYPES_H
2 #define JOS_INC_TYPES_H
4 #ifndef NULL
5 #define NULL ((void*) 0)
6 #endif
8 // Represents true-or-false values
9 typedef int bool;
11 // Explicitly-sized versions of integer types
12 typedef __signed char int8_t;
13 typedef unsigned char uint8_t;
14 typedef short int16_t;
15 typedef unsigned short uint16_t;
16 typedef int int32_t;
17 typedef unsigned int uint32_t;
18 typedef long long int64_t;
19 typedef unsigned long long uint64_t;
21 // Pointers and addresses are 32 bits long.
22 // We use pointer types to represent virtual addresses,
23 // uintptr_t to represent the numerical values of virtual addresses,
24 // and physaddr_t to represent physical addresses.
25 typedef int32_t intptr_t;
26 typedef uint32_t uintptr_t;
27 typedef uint32_t physaddr_t;
29 // Page numbers are 32 bits long.
30 typedef uint32_t ppn_t;
32 // size_t is used for memory object sizes.
33 typedef uint32_t size_t;
34 // ssize_t is a signed version of ssize_t, used in case there might be an
35 // error return.
36 typedef int32_t ssize_t;
38 // off_t is used for file offsets and lengths.
39 typedef int32_t off_t;
41 // Efficient min and max operations
42 #define MIN(_a, _b) \
43 ({ \
44 typeof(_a) __a = (_a); \
45 typeof(_b) __b = (_b); \
46 __a <= __b ? __a : __b; \
48 #define MAX(_a, _b) \
49 ({ \
50 typeof(_a) __a = (_a); \
51 typeof(_b) __b = (_b); \
52 __a >= __b ? __a : __b; \
55 // Rounding operations (efficient when n is a power of 2)
56 // Round down to the nearest multiple of n
57 #define ROUNDDOWN(a, n) \
58 ({ \
59 uint32_t __a = (uint32_t) (a); \
60 (typeof(a)) (__a - __a % (n)); \
62 // Round up to the nearest multiple of n
63 #define ROUNDUP(a, n) \
64 ({ \
65 uint32_t __n = (uint32_t) (n); \
66 (typeof(a)) (ROUNDDOWN((uint32_t) (a) + __n - 1, __n)); \
69 // Return the offset of 'member' relative to the beginning of a struct type
70 #define offsetof(type, member) ((size_t) (&((type*)0)->member))
72 #endif /* !JOS_INC_TYPES_H */