arch/sparc/lib/M7copy_to_user.S

   1 /*
   2  * M7copy_to_user.S: SPARC M7 optimized copy to userspace.
   3  *
   4  * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
   5  */
   6
   7
   8 #define EX_ST(x, y)                     \
   9 98:     x;                              \
  10         .section __ex_table,"a";        \
  11         .align 4;                       \
  12         .word 98b, y;                   \
  13         .text;                          \
  14         .align 4;
  15
  16 #define EX_ST_FP(x, y)                  \
  17 98:     x;                              \
  18         .section __ex_table,"a";        \
  19         .align 4;                       \
  20         .word 98b, y##_fp;              \
  21         .text;                          \
  22         .align 4;
  23
  24
  25 #ifndef ASI_AIUS
  26 #define ASI_AIUS        0x11
  27 #endif
  28
  29 #ifndef ASI_BLK_INIT_QUAD_LDD_AIUS
  30 #define ASI_BLK_INIT_QUAD_LDD_AIUS 0x23
  31 #endif
  32
  33 #define FUNC_NAME               M7copy_to_user
  34 #define STORE(type,src,addr)    type##a src, [addr] %asi
  35 #define STORE_ASI               ASI_BLK_INIT_QUAD_LDD_AIUS
  36 #define STORE_MRU_ASI           ASI_ST_BLKINIT_MRU_S
  37 #define EX_RETVAL(x)            0
  38
  39 #ifdef __KERNEL__
  40         /* Writing to %asi is _expensive_ so we hardcode it.
  41          * Reading %asi to check for KERNEL_DS is comparatively
  42          * cheap.
  43          */
  44 #define PREAMBLE                                        \
  45         rd              %asi, %g1;                      \
  46         cmp             %g1, ASI_AIUS;                  \
  47         bne,pn          %icc, raw_copy_in_user;         \
  48          nop
  49 #endif
  50
  51 #include "M7memcpy.S"