arch/sparc/lib/GENcopy_to_user.S

   1 /* GENcopy_to_user.S: Generic sparc64 copy to userspace.
   2  *
   3  * Copyright (C) 2007 David S. Miller (davem@davemloft.net)
   4  */
   5
   6 #define EX_ST(x)                \
   7 98:     x;                      \
   8         .section __ex_table,"a";\
   9         .align 4;               \
  10         .word 98b, __retl_one;  \
  11         .text;                  \
  12         .align 4;
  13
  14 #ifndef ASI_AIUS
  15 #define ASI_AIUS        0x11
  16 #endif
  17
  18 #define FUNC_NAME               GENcopy_to_user
  19 #define STORE(type,src,addr)    type##a src, [addr] ASI_AIUS
  20 #define EX_RETVAL(x)            0
  21
  22 #ifdef __KERNEL__
  23         /* Writing to %asi is _expensive_ so we hardcode it.
  24          * Reading %asi to check for KERNEL_DS is comparatively
  25          * cheap.
  26          */
  27 #define PREAMBLE                                        \
  28         rd              %asi, %g1;                      \
  29         cmp             %g1, ASI_AIUS;                  \
  30         bne,pn          %icc, ___copy_in_user;          \
  31          nop
  32 #endif
  33
  34 #include "GENmemcpy.S"