#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); 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_ */