summaryrefslogtreecommitdiffstats
path: root/arch/mn10300/lib/do_csum.S
diff options
context:
space:
mode:
Diffstat (limited to 'arch/mn10300/lib/do_csum.S')
-rw-r--r--arch/mn10300/lib/do_csum.S157
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