| #ifndef _LINUX_SHM_H_ |
| #define _LINUX_SHM_H_ |
| |
| #include <linux/list.h> |
| #include <asm/page.h> |
| #include <uapi/linux/shm.h> |
| #include <asm/shmparam.h> |
| |
| struct shmid_kernel /* private to the kernel */ |
| { |
| struct kern_ipc_perm shm_perm; |
| struct file *shm_file; |
| unsigned long shm_nattch; |
| unsigned long shm_segsz; |
| time_t shm_atim; |
| time_t shm_dtim; |
| time_t shm_ctim; |
| pid_t shm_cprid; |
| pid_t shm_lprid; |
| struct user_struct *mlock_user; |
| |
| /* The task created the shm object. NULL if the task is dead. */ |
| struct task_struct *shm_creator; |
| struct list_head shm_clist; /* list by creator */ |
| }; |
| |
| /* shm_mode upper byte flags */ |
| #define SHM_DEST 01000 /* segment will be destroyed on last detach */ |
| #define SHM_LOCKED 02000 /* segment will not be swapped */ |
| #define SHM_HUGETLB 04000 /* segment will use huge TLB pages */ |
| #define SHM_NORESERVE 010000 /* don't check for reservations */ |
| |
| /* Bits [26:31] are reserved */ |
| |
| /* |
| * When SHM_HUGETLB is set bits [26:31] encode the log2 of the huge page size. |
| * This gives us 6 bits, which is enough until someone invents 128 bit address |
| * spaces. |
| * |
| * Assume these are all power of twos. |
| * When 0 use the default page size. |
| */ |
| #define SHM_HUGE_SHIFT 26 |
| #define SHM_HUGE_MASK 0x3f |
| #define SHM_HUGE_2MB (21 << SHM_HUGE_SHIFT) |
| #define SHM_HUGE_1GB (30 << SHM_HUGE_SHIFT) |
| |
| #ifdef CONFIG_SYSVIPC |
| struct sysv_shm { |
| struct list_head shm_clist; |
| }; |
| |
| long do_shmat(int shmid, char __user *shmaddr, int shmflg, unsigned long *addr, |
| unsigned long shmlba); |
| extern int is_file_shm_hugepages(struct file *file); |
| void exit_shm(struct task_struct *task); |
| #define shm_init_task(task) INIT_LIST_HEAD(&(task)->sysvshm.shm_clist) |
| #else |
| struct sysv_shm { |
| /* empty */ |
| }; |
| |
| static inline long do_shmat(int shmid, char __user *shmaddr, |
| int shmflg, unsigned long *addr, |
| unsigned long shmlba) |
| { |
| return -ENOSYS; |
| } |
| static inline int is_file_shm_hugepages(struct file *file) |
| { |
| return 0; |
| } |
| static inline void exit_shm(struct task_struct *task) |
| { |
| } |
| static inline void shm_init_task(struct task_struct *task) |
| { |
| } |
| #endif |
| |
| #endif /* _LINUX_SHM_H_ */ |