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Diffstat (limited to 'arch/ppc64/lib/checksum.S')
| -rw-r--r-- | arch/ppc64/lib/checksum.S | 229 |
1 files changed, 0 insertions, 229 deletions
diff --git a/arch/ppc64/lib/checksum.S b/arch/ppc64/lib/checksum.S deleted file mode 100644 index ef96c6c58ef..00000000000 --- a/arch/ppc64/lib/checksum.S +++ /dev/null @@ -1,229 +0,0 @@ -/* - * This file contains assembly-language implementations - * of IP-style 1's complement checksum routines. - * - * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. - * - * Severely hacked about by Paul Mackerras (paulus@cs.anu.edu.au). - */ - -#include <linux/sys.h> -#include <asm/processor.h> -#include <asm/errno.h> -#include <asm/ppc_asm.h> - -/* - * ip_fast_csum(r3=buf, r4=len) -- Optimized for IP header - * len is in words and is always >= 5. - * - * In practice len == 5, but this is not guaranteed. So this code does not - * attempt to use doubleword instructions. - */ -_GLOBAL(ip_fast_csum) - lwz r0,0(r3) - lwzu r5,4(r3) - addic. r4,r4,-2 - addc r0,r0,r5 - mtctr r4 - blelr- -1: lwzu r4,4(r3) - adde r0,r0,r4 - bdnz 1b - addze r0,r0 /* add in final carry */ - rldicl r4,r0,32,0 /* fold two 32-bit halves together */ - add r0,r0,r4 - srdi r0,r0,32 - rlwinm r3,r0,16,0,31 /* fold two halves together */ - add r3,r0,r3 - not r3,r3 - srwi r3,r3,16 - blr - -/* - * Compute checksum of TCP or UDP pseudo-header: - * csum_tcpudp_magic(r3=saddr, r4=daddr, r5=len, r6=proto, r7=sum) - * No real gain trying to do this specially for 64 bit, but - * the 32 bit addition may spill into the upper bits of - * the doubleword so we still must fold it down from 64. - */ -_GLOBAL(csum_tcpudp_magic) - rlwimi r5,r6,16,0,15 /* put proto in upper half of len */ - addc r0,r3,r4 /* add 4 32-bit words together */ - adde r0,r0,r5 - adde r0,r0,r7 - rldicl r4,r0,32,0 /* fold 64 bit value */ - add r0,r4,r0 - srdi r0,r0,32 - rlwinm r3,r0,16,0,31 /* fold two halves together */ - add r3,r0,r3 - not r3,r3 - srwi r3,r3,16 - blr - -/* - * Computes the checksum of a memory block at buff, length len, - * and adds in "sum" (32-bit). - * - * This code assumes at least halfword alignment, though the length - * can be any number of bytes. The sum is accumulated in r5. - * - * csum_partial(r3=buff, r4=len, r5=sum) - */ -_GLOBAL(csum_partial) - subi r3,r3,8 /* we'll offset by 8 for the loads */ - srdi. r6,r4,3 /* divide by 8 for doubleword count */ - addic r5,r5,0 /* clear carry */ - beq 3f /* if we're doing < 8 bytes */ - andi. r0,r3,2 /* aligned on a word boundary already? */ - beq+ 1f - lhz r6,8(r3) /* do 2 bytes to get aligned */ - addi r3,r3,2 - subi r4,r4,2 - addc r5,r5,r6 - srdi. r6,r4,3 /* recompute number of doublewords */ - beq 3f /* any left? */ -1: mtctr r6 -2: ldu r6,8(r3) /* main sum loop */ - adde r5,r5,r6 - bdnz 2b - andi. r4,r4,7 /* compute bytes left to sum after doublewords */ -3: cmpwi 0,r4,4 /* is at least a full word left? */ - blt 4f - lwz r6,8(r3) /* sum this word */ - addi r3,r3,4 - subi r4,r4,4 - adde r5,r5,r6 -4: cmpwi 0,r4,2 /* is at least a halfword left? */ - blt+ 5f - lhz r6,8(r3) /* sum this halfword */ - addi r3,r3,2 - subi r4,r4,2 - adde r5,r5,r6 -5: cmpwi 0,r4,1 /* is at least a byte left? */ - bne+ 6f - lbz r6,8(r3) /* sum this byte */ - slwi r6,r6,8 /* this byte is assumed to be the upper byte of a halfword */ - adde r5,r5,r6 -6: addze r5,r5 /* add in final carry */ - rldicl r4,r5,32,0 /* fold two 32-bit halves together */ - add r3,r4,r5 - srdi r3,r3,32 - blr - -/* - * Computes the checksum of a memory block at src, length len, - * and adds in "sum" (32-bit), while copying the block to dst. - * If an access exception occurs on src or dst, it stores -EFAULT - * to *src_err or *dst_err respectively, and (for an error on - * src) zeroes the rest of dst. - * - * This code needs to be reworked to take advantage of 64 bit sum+copy. - * However, due to tokenring halfword alignment problems this will be very - * tricky. For now we'll leave it until we instrument it somehow. - * - * csum_partial_copy_generic(r3=src, r4=dst, r5=len, r6=sum, r7=src_err, r8=dst_err) - */ -_GLOBAL(csum_partial_copy_generic) - addic r0,r6,0 - subi r3,r3,4 - subi r4,r4,4 - srwi. r6,r5,2 - beq 3f /* if we're doing < 4 bytes */ - andi. r9,r4,2 /* Align dst to longword boundary */ - beq+ 1f -81: lhz r6,4(r3) /* do 2 bytes to get aligned */ - addi r3,r3,2 - subi r5,r5,2 -91: sth r6,4(r4) - addi r4,r4,2 - addc r0,r0,r6 - srwi. r6,r5,2 /* # words to do */ - beq 3f -1: mtctr r6 -82: lwzu r6,4(r3) /* the bdnz has zero overhead, so it should */ -92: stwu r6,4(r4) /* be unnecessary to unroll this loop */ - adde r0,r0,r6 - bdnz 82b - andi. r5,r5,3 -3: cmpwi 0,r5,2 - blt+ 4f -83: lhz r6,4(r3) - addi r3,r3,2 - subi r5,r5,2 -93: sth r6,4(r4) - addi r4,r4,2 - adde r0,r0,r6 -4: cmpwi 0,r5,1 - bne+ 5f -84: lbz r6,4(r3) -94: stb r6,4(r4) - slwi r6,r6,8 /* Upper byte of word */ - adde r0,r0,r6 -5: addze r3,r0 /* add in final carry (unlikely with 64-bit regs) */ - rldicl r4,r3,32,0 /* fold 64 bit value */ - add r3,r4,r3 - srdi r3,r3,32 - blr - -/* These shouldn't go in the fixup section, since that would - cause the ex_table addresses to get out of order. */ - - .globl src_error_1 -src_error_1: - li r6,0 - subi r5,r5,2 -95: sth r6,4(r4) - addi r4,r4,2 - srwi. r6,r5,2 - beq 3f - mtctr r6 - .globl src_error_2 -src_error_2: - li r6,0 -96: stwu r6,4(r4) - bdnz 96b -3: andi. r5,r5,3 - beq src_error - .globl src_error_3 -src_error_3: - li r6,0 - mtctr r5 - addi r4,r4,3 -97: stbu r6,1(r4) - bdnz 97b - .globl src_error -src_error: - cmpdi 0,r7,0 - beq 1f - li r6,-EFAULT - stw r6,0(r7) -1: addze r3,r0 - blr - - .globl dst_error -dst_error: - cmpdi 0,r8,0 - beq 1f - li r6,-EFAULT - stw r6,0(r8) -1: addze r3,r0 - blr - -.section __ex_table,"a" - .align 3 - .llong 81b,src_error_1 - .llong 91b,dst_error - .llong 82b,src_error_2 - .llong 92b,dst_error - .llong 83b,src_error_3 - .llong 93b,dst_error - .llong 84b,src_error_3 - .llong 94b,dst_error - .llong 95b,dst_error - .llong 96b,dst_error - .llong 97b,dst_error |