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1 | #ifndef _LINUX_SHM_H_ |
2 | #define _LINUX_SHM_H_ |
3 | |
4 | #include <asm/page.h> |
5 | #include <uapi/linux/shm.h> |
6 | |
7 | #define SHMALL (SHMMAX/PAGE_SIZE*(SHMMNI/16)) /* max shm system wide (pages) */ |
8 | #include <asm/shmparam.h> |
9 | struct shmid_kernel /* private to the kernel */ |
10 | { |
11 | struct kern_ipc_perm shm_perm; |
12 | struct file * shm_file; |
13 | unsigned long shm_nattch; |
14 | unsigned long shm_segsz; |
15 | time_t shm_atim; |
16 | time_t shm_dtim; |
17 | time_t shm_ctim; |
18 | pid_t shm_cprid; |
19 | pid_t shm_lprid; |
20 | struct user_struct *mlock_user; |
21 | |
22 | /* The task created the shm object. NULL if the task is dead. */ |
23 | struct task_struct *shm_creator; |
24 | }; |
25 | |
26 | /* shm_mode upper byte flags */ |
27 | #define SHM_DEST 01000 /* segment will be destroyed on last detach */ |
28 | #define SHM_LOCKED 02000 /* segment will not be swapped */ |
29 | #define SHM_HUGETLB 04000 /* segment will use huge TLB pages */ |
30 | #define SHM_NORESERVE 010000 /* don't check for reservations */ |
31 | |
32 | /* Bits [26:31] are reserved */ |
33 | |
34 | /* |
35 | * When SHM_HUGETLB is set bits [26:31] encode the log2 of the huge page size. |
36 | * This gives us 6 bits, which is enough until someone invents 128 bit address |
37 | * spaces. |
38 | * |
39 | * Assume these are all power of twos. |
40 | * When 0 use the default page size. |
41 | */ |
42 | #define SHM_HUGE_SHIFT 26 |
43 | #define SHM_HUGE_MASK 0x3f |
44 | #define SHM_HUGE_2MB (21 << SHM_HUGE_SHIFT) |
45 | #define SHM_HUGE_1GB (30 << SHM_HUGE_SHIFT) |
46 | |
47 | #ifdef CONFIG_SYSVIPC |
48 | long do_shmat(int shmid, char __user *shmaddr, int shmflg, unsigned long *addr, |
49 | unsigned long shmlba); |
50 | extern int is_file_shm_hugepages(struct file *file); |
51 | extern void exit_shm(struct task_struct *task); |
52 | #else |
53 | static inline long do_shmat(int shmid, char __user *shmaddr, |
54 | int shmflg, unsigned long *addr, |
55 | unsigned long shmlba) |
56 | { |
57 | return -ENOSYS; |
58 | } |
59 | static inline int is_file_shm_hugepages(struct file *file) |
60 | { |
61 | return 0; |
62 | } |
63 | static inline void exit_shm(struct task_struct *task) |
64 | { |
65 | } |
66 | #endif |
67 | |
68 | #endif /* _LINUX_SHM_H_ */ |
69 |
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