1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * This header has been modifies to remove definitions of types that
4 * are defined in standard userspace headers or are problematic for some
5 * other reason.
6 */
7
8 #ifndef _LINUX_TYPES_H
9 #define _LINUX_TYPES_H
10
11 #define __EXPORTED_HEADERS__
12 #include <uapi/linux/types.h>
13
14 #ifndef __ASSEMBLY__
15
16 #define DECLARE_BITMAP(name, bits) \
17 unsigned long name[BITS_TO_LONGS(bits)]
18
19 typedef __u32 __kernel_dev_t;
20
21 /* bsd */
22 typedef unsigned char u_char;
23 typedef unsigned short u_short;
24 typedef unsigned int u_int;
25 typedef unsigned long u_long;
26
27 /* sysv */
28 typedef unsigned char unchar;
29 typedef unsigned short ushort;
30 typedef unsigned int uint;
31 typedef unsigned long ulong;
32
33 #ifndef __BIT_TYPES_DEFINED__
34 #define __BIT_TYPES_DEFINED__
35
36 typedef __u8 u_int8_t;
37 typedef __s8 int8_t;
38 typedef __u16 u_int16_t;
39 typedef __s16 int16_t;
40 typedef __u32 u_int32_t;
41 typedef __s32 int32_t;
42
43 #endif /* !(__BIT_TYPES_DEFINED__) */
44
45 typedef __u8 uint8_t;
46 typedef __u16 uint16_t;
47 typedef __u32 uint32_t;
48
49 /* this is a special 64bit data type that is 8-byte aligned */
50 #define aligned_u64 __u64 __attribute__((aligned(8)))
51 #define aligned_be64 __be64 __attribute__((aligned(8)))
52 #define aligned_le64 __le64 __attribute__((aligned(8)))
53
54 /**
55 * The type used for indexing onto a disc or disc partition.
56 *
57 * Linux always considers sectors to be 512 bytes long independently
58 * of the devices real block size.
59 *
60 * blkcnt_t is the type of the inode's block count.
61 */
62 typedef u64 sector_t;
63
64 /*
65 * The type of an index into the pagecache.
66 */
67 #define pgoff_t unsigned long
68
69 /*
70 * A dma_addr_t can hold any valid DMA address, i.e., any address returned
71 * by the DMA API.
72 *
73 * If the DMA API only uses 32-bit addresses, dma_addr_t need only be 32
74 * bits wide. Bus addresses, e.g., PCI BARs, may be wider than 32 bits,
75 * but drivers do memory-mapped I/O to ioremapped kernel virtual addresses,
76 * so they don't care about the size of the actual bus addresses.
77 */
78 #ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
79 typedef u64 dma_addr_t;
80 #else
81 typedef u32 dma_addr_t;
82 #endif
83
84 #ifdef CONFIG_PHYS_ADDR_T_64BIT
85 typedef u64 phys_addr_t;
86 #else
87 typedef u32 phys_addr_t;
88 #endif
89
90 typedef phys_addr_t resource_size_t;
91
92 /*
93 * This type is the placeholder for a hardware interrupt number. It has to be
94 * big enough to enclose whatever representation is used by a given platform.
95 */
96 typedef unsigned long irq_hw_number_t;
97
98 typedef struct {
99 int counter;
100 } atomic_t;
101
102 #ifdef CONFIG_64BIT
103 typedef struct {
104 long counter;
105 } atomic64_t;
106 #endif
107
108 struct list_head {
109 struct list_head *next, *prev;
110 };
111
112 struct hlist_head {
113 struct hlist_node *first;
114 };
115
116 struct hlist_node {
117 struct hlist_node *next, **pprev;
118 };
119
120 /**
121 * struct callback_head - callback structure for use with RCU and task_work
122 * @next: next update requests in a list
123 * @func: actual update function to call after the grace period.
124 *
125 * The struct is aligned to size of pointer. On most architectures it happens
126 * naturally due ABI requirements, but some architectures (like CRIS) have
127 * weird ABI and we need to ask it explicitly.
128 *
129 * The alignment is required to guarantee that bits 0 and 1 of @next will be
130 * clear under normal conditions -- as long as we use call_rcu() or
131 * call_srcu() to queue callback.
132 *
133 * This guarantee is important for few reasons:
134 * - future call_rcu_lazy() will make use of lower bits in the pointer;
135 * - the structure shares storage spacer in struct page with @compound_head,
136 * which encode PageTail() in bit 0. The guarantee is needed to avoid
137 * false-positive PageTail().
138 */
139 struct callback_head {
140 struct callback_head *next;
141 void (*func)(struct callback_head *head);
142 } __attribute__((aligned(sizeof(void *))));
143 #define rcu_head callback_head
144
145 typedef void (*rcu_callback_t)(struct rcu_head *head);
146 typedef void (*call_rcu_func_t)(struct rcu_head *head, rcu_callback_t func);
147
148 /* clocksource cycle base type */
149 typedef u64 cycle_t;
150
151 #endif /* __ASSEMBLY__ */
152 #endif /* _LINUX_TYPES_H */