kernel/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)                \
   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_INIT_QUAD_LDD_AIUS
  19 #define ASI_BLK_INIT_QUAD_LDD_AIUS 0x23
  20 #endif
  21
  22 #define FUNC_NAME               NG4copy_to_user
  23 #define STORE(type,src,addr)    type##a src, [addr] %asi
  24 #define STORE_ASI               ASI_BLK_INIT_QUAD_LDD_AIUS
  25 #define EX_RETVAL(x)            0
  26
  27 #ifdef __KERNEL__
  28         /* Writing to %asi is _expensive_ so we hardcode it.
  29          * Reading %asi to check for KERNEL_DS is comparatively
  30          * cheap.
  31          */
  32 #define PREAMBLE                                        \
  33         rd              %asi, %g1;                      \
  34         cmp             %g1, ASI_AIUS;                  \
  35         bne,pn          %icc, ___copy_in_user;          \
  36          nop
  37 #endif
  38
  39 #include "NG4memcpy.S"