arch/sparc/lib/NG4copy_to_user.S

   1 /* NG4copy_to_user.S: Niagara-4 optimized copy to userspace.
   2  *
   3  * Copyright (C) 2012 David S. Miller (davem@davemloft.net)
   4  */
   5
   6 #define EX_ST(x,y)              \
   7 98:     x;                      \
   8         .section __ex_table,"a";\
   9         .align 4;               \
  10         .word 98b, y;           \
  11         .text;                  \
  12         .align 4;
  13
  14 #define EX_ST_FP(x,y)           \
  15 98:     x;                      \
  16         .section __ex_table,"a";\
  17         .align 4;               \
  18         .word 98b, y##_fp;      \
  19         .text;                  \
  20         .align 4;
  21
  22 #ifndef ASI_AIUS
  23 #define ASI_AIUS        0x11
  24 #endif
  25
  26 #ifndef ASI_BLK_INIT_QUAD_LDD_AIUS
  27 #define ASI_BLK_INIT_QUAD_LDD_AIUS 0x23
  28 #endif
  29
  30 #define FUNC_NAME               NG4copy_to_user
  31 #define STORE(type,src,addr)    type##a src, [addr] %asi
  32 #define STORE_ASI               ASI_BLK_INIT_QUAD_LDD_AIUS
  33 #define EX_RETVAL(x)            0
  34
  35 #ifdef __KERNEL__
  36         /* Writing to %asi is _expensive_ so we hardcode it.
  37          * Reading %asi to check for KERNEL_DS is comparatively
  38          * cheap.
  39          */
  40 #define PREAMBLE                                        \
  41         rd              %asi, %g1;                      \
  42         cmp             %g1, ASI_AIUS;                  \
  43         bne,pn          %icc, ___copy_in_user;          \
  44          nop
  45 #endif
  46
  47 #include "NG4memcpy.S"