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 #ifdef CONFIG_LBDAF 63 typedef u64 sector_t; 64 #else 65 typedef unsigned long sector_t; 66 #endif 67 68 /* 69 * The type of an index into the pagecache. 70 */ 71 #define pgoff_t unsigned long 72 73 /* 74 * A dma_addr_t can hold any valid DMA address, i.e., any address returned 75 * by the DMA API. 76 * 77 * If the DMA API only uses 32-bit addresses, dma_addr_t need only be 32 78 * bits wide. Bus addresses, e.g., PCI BARs, may be wider than 32 bits, 79 * but drivers do memory-mapped I/O to ioremapped kernel virtual addresses, 80 * so they don't care about the size of the actual bus addresses. 81 */ 82 #ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT 83 typedef u64 dma_addr_t; 84 #else 85 typedef u32 dma_addr_t; 86 #endif 87 88 #ifdef CONFIG_PHYS_ADDR_T_64BIT 89 typedef u64 phys_addr_t; 90 #else 91 typedef u32 phys_addr_t; 92 #endif 93 94 typedef phys_addr_t resource_size_t; 95 96 /* 97 * This type is the placeholder for a hardware interrupt number. It has to be 98 * big enough to enclose whatever representation is used by a given platform. 99 */ 100 typedef unsigned long irq_hw_number_t; 101 102 typedef struct { 103 int counter; 104 } atomic_t; 105 106 #ifdef CONFIG_64BIT 107 typedef struct { 108 long counter; 109 } atomic64_t; 110 #endif 111 112 struct list_head { 113 struct list_head *next, *prev; 114 }; 115 116 struct hlist_head { 117 struct hlist_node *first; 118 }; 119 120 struct hlist_node { 121 struct hlist_node *next, **pprev; 122 }; 123 124 /** 125 * struct callback_head - callback structure for use with RCU and task_work 126 * @next: next update requests in a list 127 * @func: actual update function to call after the grace period. 128 * 129 * The struct is aligned to size of pointer. On most architectures it happens 130 * naturally due ABI requirements, but some architectures (like CRIS) have 131 * weird ABI and we need to ask it explicitly. 132 * 133 * The alignment is required to guarantee that bits 0 and 1 of @next will be 134 * clear under normal conditions -- as long as we use call_rcu(), 135 * call_rcu_bh(), call_rcu_sched(), or call_srcu() to queue callback. 136 * 137 * This guarantee is important for few reasons: 138 * - future call_rcu_lazy() will make use of lower bits in the pointer; 139 * - the structure shares storage spacer in struct page with @compound_head, 140 * which encode PageTail() in bit 0. The guarantee is needed to avoid 141 * false-positive PageTail(). 142 */ 143 struct callback_head { 144 struct callback_head *next; 145 void (*func)(struct callback_head *head); 146 } __attribute__((aligned(sizeof(void *)))); 147 #define rcu_head callback_head 148 149 typedef void (*rcu_callback_t)(struct rcu_head *head); 150 typedef void (*call_rcu_func_t)(struct rcu_head *head, rcu_callback_t func); 151 152 /* clocksource cycle base type */ 153 typedef u64 cycle_t; 154 155 #endif /* __ASSEMBLY__ */ 156 #endif /* _LINUX_TYPES_H */ 157