first commit

1 files changed, 68 insertions, 0 deletions

diff --git a/include/linux/shm.h b/include/linux/shm.h
new file mode 100644
index 000000000..429c1995d
--- /dev/null
+++ b/include/linux/shm.h
@@ -0,0 +1,68 @@
+#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_ */