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Linux/arch/sparc/lib/NGcopy_to_user.S

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 /* NGcopy_to_user.S: Niagara optimized copy to userspace.
  3  *
  4  * Copyright (C) 2006, 2007 David S. Miller (davem@davemloft.net)
  5  */
  6 
  7 #define EX_ST(x,y)              \
  8 98:     x;                      \
  9         .section __ex_table,"a";\
 10         .align 4;               \
 11         .word 98b, y;           \
 12         .text;                  \
 13         .align 4;
 14 
 15 #ifndef ASI_AIUS
 16 #define ASI_AIUS        0x11
 17 #endif
 18 
 19 #define FUNC_NAME               NGcopy_to_user
 20 #define STORE(type,src,addr)    type##a src, [addr] ASI_AIUS
 21 #define STORE_ASI               ASI_BLK_INIT_QUAD_LDD_AIUS
 22 #define EX_RETVAL(x)            %g0
 23 
 24 #ifdef __KERNEL__
 25         /* Writing to %asi is _expensive_ so we hardcode it.
 26          * Reading %asi to check for KERNEL_DS is comparatively
 27          * cheap.
 28          */
 29 #define PREAMBLE                                        \
 30         rd              %asi, %g1;                      \
 31         cmp             %g1, ASI_AIUS;                  \
 32         bne,pn          %icc, raw_copy_in_user;         \
 33          nop
 34 #endif
 35 
 36 #include "NGmemcpy.S"
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