zc.h

   1 #ifndef ZC_H
   2 # define ZC_H
   3
   4 #include "cryptodev_int.h"
   5
   6 /* For zero copy */
   7 int __get_userbuf(uint8_t __user *addr, uint32_t len, int write,
   8                 int pgcount, struct page **pg, struct scatterlist *sg,
   9                 struct task_struct *task, struct mm_struct *mm);
  10 void release_user_pages(struct page **pg, int pagecount);
  11
  12 int get_userbuf(struct csession *ses, void* __user src, int src_len,
  13                 void* __user dst, int dst_len,
  14                 struct task_struct *task, struct mm_struct *mm,
  15                 struct scatterlist **src_sg,
  16                 struct scatterlist **dst_sg,
  17                 int *tot_pages);
  18
  19 /* last page - first page + 1 */
  20 #define PAGECOUNT(buf, buflen) \
  21         ((((unsigned long)(buf + buflen - 1) & PAGE_MASK) >> PAGE_SHIFT) - \
  22         (((unsigned long) buf               & PAGE_MASK) >> PAGE_SHIFT) + 1)
  23
  24 #define DEFAULT_PREALLOC_PAGES 32
  25
  26 #endif