drivers/firmware/efi/libstub/intrinsics.c

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 #include <linux/efi.h>
   4 #include <asm/efi.h>
   5 #include <asm/string.h>
   6
   7 #include "efistub.h"
   8
   9 #ifdef CONFIG_KASAN
  10 #undef memcpy
  11 #undef memmove
  12 #undef memset
  13 void *__memcpy(void *__dest, const void *__src, size_t __n) __alias(memcpy);
  14 void *__memmove(void *__dest, const void *__src, size_t count) __alias(memmove);
  15 void *__memset(void *s, int c, size_t count) __alias(memset);
  16 #endif
  17
  18 void *memcpy(void *dst, const void *src, size_t len)
  19 {
  20         efi_bs_call(copy_mem, dst, src, len);
  21         return dst;
  22 }
  23
  24 extern void *memmove(void *dst, const void *src, size_t len) __alias(memcpy);
  25
  26 void *memset(void *dst, int c, size_t len)
  27 {
  28         efi_bs_call(set_mem, dst, len, c & U8_MAX);
  29         return dst;
  30 }
  31
  32 /**
  33  * memcmp - Compare two areas of memory
  34  * @cs: One area of memory
  35  * @ct: Another area of memory
  36  * @count: The size of the area.
  37  */
  38 #undef memcmp
  39 int memcmp(const void *cs, const void *ct, size_t count)
  40 {
  41         const unsigned char *su1, *su2;
  42         int res = 0;
  43
  44         for (su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)
  45                 if ((res = *su1 - *su2) != 0)
  46                         break;
  47         return res;
  48 }