diff options
Diffstat (limited to 'arch/mn10300/lib/do_csum.S')
| -rw-r--r-- | arch/mn10300/lib/do_csum.S | 157 |
1 files changed, 0 insertions, 157 deletions
diff --git a/arch/mn10300/lib/do_csum.S b/arch/mn10300/lib/do_csum.S deleted file mode 100644 index 1d27bba0cd8f..000000000000 --- a/arch/mn10300/lib/do_csum.S +++ /dev/null @@ -1,157 +0,0 @@ -/* Optimised simple memory checksum - * - * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. - * Written by David Howells (dhowells@redhat.com) - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public Licence - * as published by the Free Software Foundation; either version - * 2 of the Licence, or (at your option) any later version. - */ -#include <asm/cache.h> - - .section .text - .balign L1_CACHE_BYTES - -############################################################################### -# -# unsigned int do_csum(const unsigned char *buff, int len) -# -############################################################################### - .globl do_csum - .type do_csum,@function -do_csum: - movm [d2,d3],(sp) - mov d1,d2 # count - mov d0,a0 # buff - mov a0,a1 - clr d1 # accumulator - - cmp +0,d2 - ble do_csum_done # check for zero length or negative - - # 4-byte align the buffer pointer - btst +3,a0 - beq do_csum_now_4b_aligned - - btst +1,a0 - beq do_csum_addr_not_odd - movbu (a0),d0 - inc a0 - asl +8,d0 - add d0,d1 - add -1,d2 - -do_csum_addr_not_odd: - cmp +2,d2 - bcs do_csum_fewer_than_4 - btst +2,a0 - beq do_csum_now_4b_aligned - movhu (a0+),d0 - add d0,d1 - add -2,d2 - cmp +4,d2 - bcs do_csum_fewer_than_4 - -do_csum_now_4b_aligned: - # we want to checksum as much as we can in chunks of 32 bytes - cmp +31,d2 - bls do_csum_remainder # 4-byte aligned remainder - - add -32,d2 - mov +32,d3 - -do_csum_loop: - mov (a0+),d0 - mov (a0+),e0 - mov (a0+),e1 - mov (a0+),e3 - add d0,d1 - addc e0,d1 - addc e1,d1 - addc e3,d1 - mov (a0+),d0 - mov (a0+),e0 - mov (a0+),e1 - mov (a0+),e3 - addc d0,d1 - addc e0,d1 - addc e1,d1 - addc e3,d1 - addc +0,d1 - - sub d3,d2 - bcc do_csum_loop - - add d3,d2 - beq do_csum_done - -do_csum_remainder: - # cut 16-31 bytes down to 0-15 - cmp +16,d2 - bcs do_csum_fewer_than_16 - mov (a0+),d0 - mov (a0+),e0 - mov (a0+),e1 - mov (a0+),e3 - add d0,d1 - addc e0,d1 - addc e1,d1 - addc e3,d1 - addc +0,d1 - add -16,d2 - beq do_csum_done - -do_csum_fewer_than_16: - # copy the remaining whole words - cmp +4,d2 - bcs do_csum_fewer_than_4 - cmp +8,d2 - bcs do_csum_one_word - cmp +12,d2 - bcs do_csum_two_words - mov (a0+),d0 - add d0,d1 - addc +0,d1 -do_csum_two_words: - mov (a0+),d0 - add d0,d1 - addc +0,d1 -do_csum_one_word: - mov (a0+),d0 - add d0,d1 - addc +0,d1 - -do_csum_fewer_than_4: - and +3,d2 - beq do_csum_done - xor_cmp d0,d0,+2,d2 - bcs do_csum_fewer_than_2 - movhu (a0+),d0 - and +1,d2 - beq do_csum_add_last_bit -do_csum_fewer_than_2: - movbu (a0),d3 - add d3,d0 -do_csum_add_last_bit: - add d0,d1 - addc +0,d1 - -do_csum_done: - # compress the checksum down to 16 bits - mov +0xffff0000,d0 - and d1,d0 - asl +16,d1 - add d1,d0 - addc +0xffff,d0 - lsr +16,d0 - - # flip the halves of the word result if the buffer was oddly aligned - and +1,a1 - beq do_csum_not_oddly_aligned - swaph d0,d0 # exchange bits 15:8 with 7:0 - -do_csum_not_oddly_aligned: - ret [d2,d3],8 - - .size do_csum, .-do_csum |