Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / include / linux / shm.h

diff --git a/kernel/include/linux/shm.h b/kernel/include/linux/shm.h
new file mode 100644 (file)
index 0000000..6fb8016
--- /dev/null
+++ b/kernel/include/linux/shm.h
@@ -0,0 +1,81 @@
+#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_ */