memcpy.c 1.5 KB

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  1. // SPDX-License-Identifier: GPL-2.0-or-later
  2. /*
  3. * Optimized memory copy routines.
  4. *
  5. * Copyright (C) 2004 Randolph Chung <[email protected]>
  6. * Copyright (C) 2013-2017 Helge Deller <[email protected]>
  7. *
  8. * Portions derived from the GNU C Library
  9. * Copyright (C) 1991, 1997, 2003 Free Software Foundation, Inc.
  10. */
  11. #include <linux/module.h>
  12. #include <linux/compiler.h>
  13. #include <linux/uaccess.h>
  14. #define get_user_space() mfsp(SR_USER)
  15. #define get_kernel_space() SR_KERNEL
  16. /* Returns 0 for success, otherwise, returns number of bytes not transferred. */
  17. extern unsigned long pa_memcpy(void *dst, const void *src,
  18. unsigned long len);
  19. unsigned long raw_copy_to_user(void __user *dst, const void *src,
  20. unsigned long len)
  21. {
  22. mtsp(get_kernel_space(), SR_TEMP1);
  23. mtsp(get_user_space(), SR_TEMP2);
  24. return pa_memcpy((void __force *)dst, src, len);
  25. }
  26. EXPORT_SYMBOL(raw_copy_to_user);
  27. unsigned long raw_copy_from_user(void *dst, const void __user *src,
  28. unsigned long len)
  29. {
  30. mtsp(get_user_space(), SR_TEMP1);
  31. mtsp(get_kernel_space(), SR_TEMP2);
  32. return pa_memcpy(dst, (void __force *)src, len);
  33. }
  34. EXPORT_SYMBOL(raw_copy_from_user);
  35. void * memcpy(void * dst,const void *src, size_t count)
  36. {
  37. mtsp(get_kernel_space(), SR_TEMP1);
  38. mtsp(get_kernel_space(), SR_TEMP2);
  39. pa_memcpy(dst, src, count);
  40. return dst;
  41. }
  42. EXPORT_SYMBOL(memcpy);
  43. bool copy_from_kernel_nofault_allowed(const void *unsafe_src, size_t size)
  44. {
  45. if ((unsigned long)unsafe_src < PAGE_SIZE)
  46. return false;
  47. /* check for I/O space F_EXTEND(0xfff00000) access as well? */
  48. return true;
  49. }