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- /*
- * 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);
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