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/*

 * Copyright (C) 2008 Bahadir Balban

 */

#ifndef __SHM_H__

#define __SHM_H__

#include <l4/lib/list.h>

#include <l4/api/space.h>

#include <l4/macros.h>

#include <l4lib/types.h>

#include <task.h>

#include <posix/sys/ipc.h>

#include <posix/sys/shm.h>

#include <posix/sys/types.h>

struct shm_descriptor {

        int key;

        l4id_t shmid;

        void *shm_addr;

        unsigned long npages;

        struct vm_file *devzero;

};

#if 0

struct shm_descriptor {

        int key;                        /* IPC key supplied by user task */

        l4id_t shmid;                   /* SHM area id, allocated by mm0 */

        struct link list;               /* SHM list, used by mm0 */

        struct vm_file *owner;

        void *shm_addr;                 /* The virtual address for segment. */

        unsigned long size;             /* Size of the area in pages */

        unsigned int flags;

        int refcnt;

};

#endif

#define SHM_AREA_MAX                    64      /* Up to 64 shm areas */

/* Up to 10 pages per area, and at least 1 byte (implies 1 page) */

#define SHM_SHMMIN                      1

#define SHM_SHMMAX                      10

/* Initialises shared memory bookkeeping structures */

int shm_pool_init();

void *shmat_shmget_internal(struct tcb *task, key_t key, void *shmaddr);

struct vm_file *shm_new(key_t key, unsigned long npages);

void *shm_new_address(int npages);

/* Below is the special-case per-task default shared memory page prototypes */

/* Prefaults shared page after mapping */

#define SHPAGE_PREFAULT         (1 << 0)

/* Creates new shm segment for default shpage */

#define SHPAGE_NEW_SHM          (1 << 1)

/* Allocates a virtual address for default shpage */

#define SHPAGE_NEW_ADDRESS      (1 << 2)

/* IPC to send utcb address information to tasks */

void *task_send_shpage_address(struct tcb *sender, l4id_t taskid);

int shpage_map_to_task(struct tcb *owner, struct tcb *mapper, unsigned int flags);

int shpage_unmap_from_task(struct tcb *owner, struct tcb *mapper);

/* Prefault a *mmaped* default shared page */

int shpage_prefault(struct tcb *task, unsigned int vmflags);

#endif /* __SHM_H__ */