| /* | |
| * Optimized xor_block operation for RAID4/5 | |
| * | |
| * Copyright IBM Corp. 2016 | |
| * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com> | |
| */ | |
| #include <linux/types.h> | |
| #include <linux/module.h> | |
| #include <linux/raid/xor.h> | |
| static void xor_xc_2(unsigned long bytes, unsigned long *p1, unsigned long *p2) | |
| { | |
| asm volatile( | |
| " larl 1,2f\n" | |
| " aghi %0,-1\n" | |
| " jm 3f\n" | |
| " srlg 0,%0,8\n" | |
| " ltgr 0,0\n" | |
| " jz 1f\n" | |
| "0: xc 0(256,%1),0(%2)\n" | |
| " la %1,256(%1)\n" | |
| " la %2,256(%2)\n" | |
| " brctg 0,0b\n" | |
| "1: ex %0,0(1)\n" | |
| " j 3f\n" | |
| "2: xc 0(1,%1),0(%2)\n" | |
| "3:\n" | |
| : : "d" (bytes), "a" (p1), "a" (p2) | |
| : "0", "1", "cc", "memory"); | |
| } | |
| static void xor_xc_3(unsigned long bytes, unsigned long *p1, unsigned long *p2, | |
| unsigned long *p3) | |
| { | |
| asm volatile( | |
| " larl 1,2f\n" | |
| " aghi %0,-1\n" | |
| " jm 3f\n" | |
| " srlg 0,%0,8\n" | |
| " ltgr 0,0\n" | |
| " jz 1f\n" | |
| "0: xc 0(256,%1),0(%2)\n" | |
| " xc 0(256,%1),0(%3)\n" | |
| " la %1,256(%1)\n" | |
| " la %2,256(%2)\n" | |
| " la %3,256(%3)\n" | |
| " brctg 0,0b\n" | |
| "1: ex %0,0(1)\n" | |
| " ex %0,6(1)\n" | |
| " j 3f\n" | |
| "2: xc 0(1,%1),0(%2)\n" | |
| " xc 0(1,%1),0(%3)\n" | |
| "3:\n" | |
| : "+d" (bytes), "+a" (p1), "+a" (p2), "+a" (p3) | |
| : : "0", "1", "cc", "memory"); | |
| } | |
| static void xor_xc_4(unsigned long bytes, unsigned long *p1, unsigned long *p2, | |
| unsigned long *p3, unsigned long *p4) | |
| { | |
| asm volatile( | |
| " larl 1,2f\n" | |
| " aghi %0,-1\n" | |
| " jm 3f\n" | |
| " srlg 0,%0,8\n" | |
| " ltgr 0,0\n" | |
| " jz 1f\n" | |
| "0: xc 0(256,%1),0(%2)\n" | |
| " xc 0(256,%1),0(%3)\n" | |
| " xc 0(256,%1),0(%4)\n" | |
| " la %1,256(%1)\n" | |
| " la %2,256(%2)\n" | |
| " la %3,256(%3)\n" | |
| " la %4,256(%4)\n" | |
| " brctg 0,0b\n" | |
| "1: ex %0,0(1)\n" | |
| " ex %0,6(1)\n" | |
| " ex %0,12(1)\n" | |
| " j 3f\n" | |
| "2: xc 0(1,%1),0(%2)\n" | |
| " xc 0(1,%1),0(%3)\n" | |
| " xc 0(1,%1),0(%4)\n" | |
| "3:\n" | |
| : "+d" (bytes), "+a" (p1), "+a" (p2), "+a" (p3), "+a" (p4) | |
| : : "0", "1", "cc", "memory"); | |
| } | |
| static void xor_xc_5(unsigned long bytes, unsigned long *p1, unsigned long *p2, | |
| unsigned long *p3, unsigned long *p4, unsigned long *p5) | |
| { | |
| /* Get around a gcc oddity */ | |
| register unsigned long *reg7 asm ("7") = p5; | |
| asm volatile( | |
| " larl 1,2f\n" | |
| " aghi %0,-1\n" | |
| " jm 3f\n" | |
| " srlg 0,%0,8\n" | |
| " ltgr 0,0\n" | |
| " jz 1f\n" | |
| "0: xc 0(256,%1),0(%2)\n" | |
| " xc 0(256,%1),0(%3)\n" | |
| " xc 0(256,%1),0(%4)\n" | |
| " xc 0(256,%1),0(%5)\n" | |
| " la %1,256(%1)\n" | |
| " la %2,256(%2)\n" | |
| " la %3,256(%3)\n" | |
| " la %4,256(%4)\n" | |
| " la %5,256(%5)\n" | |
| " brctg 0,0b\n" | |
| "1: ex %0,0(1)\n" | |
| " ex %0,6(1)\n" | |
| " ex %0,12(1)\n" | |
| " ex %0,18(1)\n" | |
| " j 3f\n" | |
| "2: xc 0(1,%1),0(%2)\n" | |
| " xc 0(1,%1),0(%3)\n" | |
| " xc 0(1,%1),0(%4)\n" | |
| " xc 0(1,%1),0(%5)\n" | |
| "3:\n" | |
| : "+d" (bytes), "+a" (p1), "+a" (p2), "+a" (p3), "+a" (p4), | |
| "+a" (reg7) | |
| : : "0", "1", "cc", "memory"); | |
| } | |
| struct xor_block_template xor_block_xc = { | |
| .name = "xc", | |
| .do_2 = xor_xc_2, | |
| .do_3 = xor_xc_3, | |
| .do_4 = xor_xc_4, | |
| .do_5 = xor_xc_5, | |
| }; | |
| EXPORT_SYMBOL(xor_block_xc); |