arch/um/kernel/skas/include/uaccess-skas.h

   1 /*
   2  * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
   3  * Licensed under the GPL
   4  */
   5
   6 #ifndef __SKAS_UACCESS_H
   7 #define __SKAS_UACCESS_H
   8
   9 #include "asm/errno.h"
  10 #include "asm/fixmap.h"
  11
  12 #define access_ok_skas(type, addr, size) \
  13         ((segment_eq(get_fs(), KERNEL_DS)) || \
  14          (((unsigned long) (addr) < TASK_SIZE) && \
  15           ((unsigned long) (addr) + (size) <= TASK_SIZE)) || \
  16          ((type == VERIFY_READ ) && \
  17           ((unsigned long) (addr) >= FIXADDR_USER_START) && \
  18           ((unsigned long) (addr) + (size) <= FIXADDR_USER_END) && \
  19           ((unsigned long) (addr) + (size) >= (unsigned long)(addr))))
  20
  21 static inline int verify_area_skas(int type, const void * addr,
  22                                    unsigned long size)
  23 {
  24         return(access_ok_skas(type, addr, size) ? 0 : -EFAULT);
  25 }
  26
  27 extern int copy_from_user_skas(void *to, const void *from, int n);
  28 extern int copy_to_user_skas(void *to, const void *from, int n);
  29 extern int strncpy_from_user_skas(char *dst, const char *src, int count);
  30 extern int __clear_user_skas(void *mem, int len);
  31 extern int clear_user_skas(void *mem, int len);
  32 extern int strnlen_user_skas(const void *str, int len);
  33
  34 #endif
  35
  36 /*
  37  * Overrides for Emacs so that we follow Linus's tabbing style.
  38  * Emacs will notice this stuff at the end of the file and automatically
  39  * adjust the settings for this buffer only.  This must remain at the end
  40  * of the file.
  41  * ---------------------------------------------------------------------------
  42  * Local variables:
  43  * c-file-style: "linux"
  44  * End:
  45  */