arch/sparc/lib/NG2copy_to_user.S

   1 /* NG2copy_to_user.S: Niagara-2 optimized copy to userspace.
   2  *
   3  * Copyright (C) 2007 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_AIUS_4V
  27 #define ASI_BLK_AIUS_4V 0x17
  28 #endif
  29
  30 #ifndef ASI_BLK_INIT_QUAD_LDD_AIUS
  31 #define ASI_BLK_INIT_QUAD_LDD_AIUS 0x23
  32 #endif
  33
  34 #define FUNC_NAME               NG2copy_to_user
  35 #define STORE(type,src,addr)    type##a src, [addr] ASI_AIUS
  36 #define STORE_ASI               ASI_BLK_INIT_QUAD_LDD_AIUS
  37 #define STORE_BLK(src,addr)     stda src, [addr] ASI_BLK_AIUS_4V
  38 #define EX_RETVAL(x)            0
  39
  40 #ifdef __KERNEL__
  41         /* Writing to %asi is _expensive_ so we hardcode it.
  42          * Reading %asi to check for KERNEL_DS is comparatively
  43          * cheap.
  44          */
  45 #define PREAMBLE                                        \
  46         rd              %asi, %g1;                      \
  47         cmp             %g1, ASI_AIUS;                  \
  48         bne,pn          %icc, ___copy_in_user;          \
  49          nop
  50 #endif
  51
  52 #include "NG2memcpy.S"