[GitHub/mt8127/android_kernel_alcatel_ttab.git] / include / linux / shm.h

#ifndef _LINUX_SHM_H_
#define _LINUX_SHM_H_

#include <asm/page.h>
#include <uapi/linux/shm.h>

#define SHMALL (SHMMAX/PAGE_SIZE*(SHMMNI/16)) /* max shm system wide (pages) */
#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;
};

/* 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
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);
extern void exit_shm(struct task_struct *task);
#else
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)
{
}
#endif

#endif /* _LINUX_SHM_H_ */
Commit	Line	Data
1da177e4 LT	1	#ifndef _LINUX_SHM_H_
	2	#define _LINUX_SHM_H_
	3
1da177e4	4	#include <asm/page.h>
607ca46e	5	#include <uapi/linux/shm.h>
1da177e4	6
1da177e4	7	#define SHMALL (SHMMAX/PAGE_SIZE(SHMMNI/16)) / max shm system wide (pages) */
1da177e4	8	#include <asm/shmparam.h>
1da177e4 LT	9	struct shmid_kernel /* private to the kernel */
	10	{
	11	struct kern_ipc_perm shm_perm;
	12	struct file * shm_file;
1da177e4 LT	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;
5774ed01 VK	21
	22	/* The task created the shm object. NULL if the task is dead. */
	23	struct task_struct *shm_creator;
1da177e4 LT	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 */
bf8f972d	30	#define SHM_NORESERVE 010000 /* don't check for reservations */
1da177e4	31
42d7395f AK	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
1da177e4	47	#ifdef CONFIG_SYSVIPC
079a96ae WD	48	long do_shmat(int shmid, char __user shmaddr, int shmflg, unsigned long addr,
079a96ae WD	49	unsigned long shmlba);
516dffdc	50	extern int is_file_shm_hugepages(struct file *file);
b34a6b1d	51	extern void exit_shm(struct task_struct *task);
1da177e4 LT	52	#else
1da177e4 LT	53	static inline long do_shmat(int shmid, char __user *shmaddr,
079a96ae WD	54	int shmflg, unsigned long *addr,
079a96ae WD	55	unsigned long shmlba)
1da177e4 LT	56	{
	57	return -ENOSYS;
	58	}
516dffdc AL	59	static inline int is_file_shm_hugepages(struct file *file)
	60	{
	61	return 0;
	62	}
b34a6b1d VK	63	static inline void exit_shm(struct task_struct *task)
	64	{
	65	}
1da177e4 LT	66	#endif
1da177e4 LT	67
1da177e4	68	#endif /* _LINUX_SHM_H_ */