| David S. Miller | ae2c6ca | 2012-09-26 21:11:01 -0700 | [diff] [blame^] | 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" |