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/*

 * A default shared page is used by every thread

 * to pass large data for system calls.

 *

 * This file contains relevant shpage definitions.

 */

#ifndef __LIBPOSIX_SHPAGE_H__

#define __LIBPOSIX_SHPAGE_H__

#include <l4/macros.h>

#include <l4lib/ipcdefs.h>

#include <l4lib/utcb.h>

#include INC_GLUE(memory.h)

#include L4LIB_INC_ARCH(syscalls.h)

#include L4LIB_INC_ARCH(syslib.h)

extern void *shared_page;

int shared_page_init(void);

/*

 * Arguments that are too large to fit in message registers are

 * copied onto another area that is still on the utcb, and the servers

 * map-in the task utcb and read those arguments from there.

 */

static inline int copy_to_shpage(void *arg, int offset, int size)

{

        if (offset + size > PAGE_SIZE)

                return -1;

        memcpy(shared_page + offset, arg, size);

        return 0;

}

static inline int copy_from_shpage(void *buf, int offset, int size)

{

        if (offset + size > PAGE_SIZE)

                return -1;

        memcpy(buf, shared_page + offset, size);

        return 0;

}

#endif /* __LIBPOSIX_SHPAGE_H__ */