arch/sparc64/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 .fixup;        \
   9         .align 4;               \
  10 99:     wr      %g0, ASI_AIUS, %asi;\
  11         retl;                   \
  12          mov    1, %o0;         \
  13         .section __ex_table,"a";\
  14         .align 4;               \
  15         .word 98b, 99b;         \
  16         .text;                  \
  17         .align 4;
  18
  19 #ifndef ASI_AIUS
  20 #define ASI_AIUS        0x11
  21 #endif
  22
  23 #ifndef ASI_BLK_AIUS_4V
  24 #define ASI_BLK_AIUS_4V 0x17
  25 #endif
  26
  27 #ifndef ASI_BLK_INIT_QUAD_LDD_AIUS
  28 #define ASI_BLK_INIT_QUAD_LDD_AIUS 0x23
  29 #endif
  30
  31 #define FUNC_NAME               NG2copy_to_user
  32 #define STORE(type,src,addr)    type##a src, [addr] ASI_AIUS
  33 #define STORE_ASI               ASI_BLK_INIT_QUAD_LDD_AIUS
  34 #define STORE_BLK(src,addr)     stda src, [addr] ASI_BLK_AIUS_4V
  35 #define EX_RETVAL(x)            0
  36
  37 #ifdef __KERNEL__
  38         /* Writing to %asi is _expensive_ so we hardcode it.
  39          * Reading %asi to check for KERNEL_DS is comparatively
  40          * cheap.
  41          */
  42 #define PREAMBLE                                        \
  43         rd              %asi, %g1;                      \
  44         cmp             %g1, ASI_AIUS;                  \
  45         bne,pn          %icc, memcpy_user_stub;         \
  46          nop
  47 #endif
  48
  49 #include "NG2memcpy.S"