include/nucleus/bufd.h

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#ifndef _XENO_NUCLEUS_BUFD_H
#define _XENO_NUCLEUS_BUFD_H

#include <nucleus/types.h>

#ifdef CONFIG_XENO_OPT_PERVASIVE

struct mm_struct;

struct xnbufd {
        caddr_t b_ptr;          /* src/dst buffer address */
        size_t b_len;           /* total length of buffer */
        off_t b_off;            /* # of bytes read/written */
        struct mm_struct *b_mm; /* src/dst address space */
        caddr_t b_carry;        /* pointer to carry over area */
        char b_buf[64];         /* fast carry over area */
};

void xnbufd_map_umem(struct xnbufd *bufd,
                     void __user *ptr, size_t len);

static inline void xnbufd_map_uread(struct xnbufd *bufd,
                                    const void __user *ptr, size_t len)
{
        xnbufd_map_umem(bufd, (void __user *)ptr, len);
}

static inline void xnbufd_map_uwrite(struct xnbufd *bufd,
                                     void __user *ptr, size_t len)
{
        xnbufd_map_umem(bufd, ptr, len);
}

ssize_t xnbufd_unmap_uread(struct xnbufd *bufd);

ssize_t xnbufd_unmap_uwrite(struct xnbufd *bufd);

#else /* !CONFIG_XENO_OPT_PERVASIVE */

struct xnbufd {
        caddr_t b_ptr;          /* src/dst buffer address */
        size_t b_len;           /* total length of buffer */
        off_t b_off;            /* # of bytes read/written */
};

#endif /* !CONFIG_XENO_OPT_PERVASIVE */

void xnbufd_map_kmem(struct xnbufd *bufd,
                     void *ptr, size_t len);

static inline void xnbufd_map_kread(struct xnbufd *bufd,
                                    const void *ptr, size_t len)
{
        xnbufd_map_kmem(bufd, (void *)ptr, len);
}

static inline void xnbufd_map_kwrite(struct xnbufd *bufd,
                                     void *ptr, size_t len)
{
        xnbufd_map_kmem(bufd, ptr, len);
}

ssize_t xnbufd_unmap_kread(struct xnbufd *bufd);

ssize_t xnbufd_unmap_kwrite(struct xnbufd *bufd);

ssize_t xnbufd_copy_to_kmem(void *ptr,
                            struct xnbufd *bufd, size_t len);

ssize_t xnbufd_copy_from_kmem(struct xnbufd *bufd,
                              void *from, size_t len);

void xnbufd_invalidate(struct xnbufd *bufd);

static inline void xnbufd_reset(struct xnbufd *bufd)
{
        bufd->b_off = 0;
}

#endif /* !_XENO_NUCLEUS_BUFD_H */