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)                \
   7 98:     x;                      \
   8         .section __ex_table,"a";\
   9         .align 4;               \
  10         .word 98b, __retl_one_asi;\
  11         .text;                  \
  12         .align 4;
  13
  14 #ifndef ASI_AIUS
  15 #define ASI_AIUS        0x11
  16 #endif
  17
  18 #ifndef ASI_BLK_AIUS_4V
  19 #define ASI_BLK_AIUS_4V 0x17
  20 #endif
  21
  22 #ifndef ASI_BLK_INIT_QUAD_LDD_AIUS
  23 #define ASI_BLK_INIT_QUAD_LDD_AIUS 0x23
  24 #endif
  25
  26 #define FUNC_NAME               NG2copy_to_user
  27 #define STORE(type,src,addr)    type##a src, [addr] ASI_AIUS
  28 #define STORE_ASI               ASI_BLK_INIT_QUAD_LDD_AIUS
  29 #define STORE_BLK(src,addr)     stda src, [addr] ASI_BLK_AIUS_4V
  30 #define EX_RETVAL(x)            0
  31
  32 #ifdef __KERNEL__
  33         /* Writing to %asi is _expensive_ so we hardcode it.
  34          * Reading %asi to check for KERNEL_DS is comparatively
  35          * cheap.
  36          */
  37 #define PREAMBLE                                        \
  38         rd              %asi, %g1;                      \
  39         cmp             %g1, ASI_AIUS;                  \
  40         bne,pn          %icc, ___copy_in_user;          \
  41          nop
  42 #endif
  43
  44 #include "NG2memcpy.S"