mirror of https://gitee.com/openkylin/linux.git
69 lines
1.9 KiB
C
69 lines
1.9 KiB
C
#ifndef _LINUX_SHM_H_
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#define _LINUX_SHM_H_
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#include <asm/page.h>
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#include <uapi/linux/shm.h>
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#define SHMALL (SHMMAX/PAGE_SIZE*(SHMMNI/16)) /* max shm system wide (pages) */
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#include <asm/shmparam.h>
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struct shmid_kernel /* private to the kernel */
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{
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struct kern_ipc_perm shm_perm;
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struct file * shm_file;
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unsigned long shm_nattch;
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unsigned long shm_segsz;
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time_t shm_atim;
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time_t shm_dtim;
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time_t shm_ctim;
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pid_t shm_cprid;
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pid_t shm_lprid;
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struct user_struct *mlock_user;
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/* The task created the shm object. NULL if the task is dead. */
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struct task_struct *shm_creator;
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};
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/* shm_mode upper byte flags */
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#define SHM_DEST 01000 /* segment will be destroyed on last detach */
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#define SHM_LOCKED 02000 /* segment will not be swapped */
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#define SHM_HUGETLB 04000 /* segment will use huge TLB pages */
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#define SHM_NORESERVE 010000 /* don't check for reservations */
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/* Bits [26:31] are reserved */
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/*
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* When SHM_HUGETLB is set bits [26:31] encode the log2 of the huge page size.
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* This gives us 6 bits, which is enough until someone invents 128 bit address
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* spaces.
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*
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* Assume these are all power of twos.
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* When 0 use the default page size.
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*/
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#define SHM_HUGE_SHIFT 26
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#define SHM_HUGE_MASK 0x3f
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#define SHM_HUGE_2MB (21 << SHM_HUGE_SHIFT)
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#define SHM_HUGE_1GB (30 << SHM_HUGE_SHIFT)
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#ifdef CONFIG_SYSVIPC
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long do_shmat(int shmid, char __user *shmaddr, int shmflg, unsigned long *addr,
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unsigned long shmlba);
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extern int is_file_shm_hugepages(struct file *file);
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extern void exit_shm(struct task_struct *task);
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#else
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static inline long do_shmat(int shmid, char __user *shmaddr,
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int shmflg, unsigned long *addr,
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unsigned long shmlba)
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{
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return -ENOSYS;
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}
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static inline int is_file_shm_hugepages(struct file *file)
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{
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return 0;
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}
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static inline void exit_shm(struct task_struct *task)
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{
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}
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#endif
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#endif /* _LINUX_SHM_H_ */
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