redonkable/remarkable-linux
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remarkable-linux/arch/score/lib/checksum.S
Chen Liqin 6bc9a3966f score: Add support for Sunplus S+core architecture 
This is the complete set of new arch Score's files for linux.
Score instruction set support 16bits, 32bits and 64bits instruction,
Score SOC had been used in game machine and LCD TV.

Signed-off-by: Chen Liqin <liqin.chen@sunplusct.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2009-06-19 11:38:47 +02:00

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5.4 KiB
ArmAsm
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/*
* arch/score/lib/csum_partial.S
*
* Score Processor version.
*
* Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
* Lennox Wu <lennox.wu@sunplusct.com>
* Chen Liqin <liqin.chen@sunplusct.com>
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see the file COPYING, or write
* to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <linux/linkage.h>
#define ADDC(sum,reg) \
add sum, sum, reg; \
cmp.c reg, sum; \
bleu 9f; \
addi sum, 0x1; \
9:
#define CSUM_BIGCHUNK(src, offset, sum) \
lw r8, [src, offset + 0x00]; \
lw r9, [src, offset + 0x04]; \
lw r10, [src, offset + 0x08]; \
lw r11, [src, offset + 0x0c]; \
ADDC(sum, r8); \
ADDC(sum, r9); \
ADDC(sum, r10); \
ADDC(sum, r11); \
lw r8, [src, offset + 0x10]; \
lw r9, [src, offset + 0x14]; \
lw r10, [src, offset + 0x18]; \
lw r11, [src, offset + 0x1c]; \
ADDC(sum, r8); \
ADDC(sum, r9); \
ADDC(sum, r10); \
ADDC(sum, r11); \
#define src r4
#define dest r5
#define sum r27
.text
/* unknown src alignment and < 8 bytes to go */
small_csumcpy:
mv r5, r10
ldi r9, 0x0
cmpi.c r25, 0x1
beq pass_small_set_t7 /*already set, jump to pass_small_set_t7*/
andri.c r25,r4 , 0x1 /*Is src 2 bytes aligned?*/
pass_small_set_t7:
beq aligned
cmpi.c r5, 0x0
beq fold
lbu r9, [src]
slli r9,r9, 0x8 /*Little endian*/
ADDC(sum, r9)
addi src, 0x1
subi.c r5, 0x1
/*len still a full word */
aligned:
andri.c r8, r5, 0x4 /*Len >= 4?*/
beq len_less_4bytes
/* Still a full word (4byte) to go,and the src is word aligned.*/
andri.c r8, src, 0x3 /*src is 4bytes aligned, so use LW!!*/
beq four_byte_aligned
lhu r9, [src]
addi src, 2
ADDC(sum, r9)
lhu r9, [src]
addi src, 2
ADDC(sum, r9)
b len_less_4bytes
four_byte_aligned: /* Len >=4 and four byte aligned */
lw r9, [src]
addi src, 4
ADDC(sum, r9)
len_less_4bytes: /* 2 byte aligned aligned and length<4B */
andri.c r8, r5, 0x2
beq len_less_2bytes
lhu r9, [src]
addi src, 0x2 /* src+=2 */
ADDC(sum, r9)
len_less_2bytes: /* len = 1 */
andri.c r8, r5, 0x1
beq fold /* less than 2 and not equal 1--> len=0 -> fold */
lbu r9, [src]
fold_ADDC:
ADDC(sum, r9)
fold:
/* fold checksum */
slli r26, sum, 16
add sum, sum, r26
cmp.c r26, sum
srli sum, sum, 16
bleu 1f /* if r26<=sum */
addi sum, 0x1 /* r26>sum */
1:
/* odd buffer alignment? r25 was set in csum_partial */
cmpi.c r25, 0x0
beq 1f
slli r26, sum, 8
srli sum, sum, 8
or sum, sum, r26
andi sum, 0xffff
1:
.set optimize
/* Add the passed partial csum. */
ADDC(sum, r6)
mv r4, sum
br r3
.set volatile
.align 5
ENTRY(csum_partial)
ldi sum, 0
ldi r25, 0
mv r10, r5
cmpi.c r5, 0x8
blt small_csumcpy /* < 8(singed) bytes to copy */
cmpi.c r5, 0x0
beq out
andri.c r25, src, 0x1 /* odd buffer? */
beq word_align
hword_align: /* 1 byte */
lbu r8, [src]
subi r5, 0x1
slli r8, r8, 8
ADDC(sum, r8)
addi src, 0x1
word_align: /* 2 bytes */
andri.c r8, src, 0x2 /* 4bytes(dword)_aligned? */
beq dword_align /* not, maybe dword_align */
lhu r8, [src]
subi r5, 0x2
ADDC(sum, r8)
addi src, 0x2
dword_align: /* 4bytes */
mv r26, r5 /* maybe useless when len >=56 */
ldi r8, 56
cmp.c r8, r5
bgtu do_end_words /* if a1(len)<t0(56) ,unsigned */
andri.c r26, src, 0x4
beq qword_align
lw r8, [src]
subi r5, 0x4
ADDC(sum, r8)
addi src, 0x4
qword_align: /* 8 bytes */
andri.c r26, src, 0x8
beq oword_align
lw r8, [src, 0x0]
lw r9, [src, 0x4]
subi r5, 0x8 /* len-=0x8 */
ADDC(sum, r8)
ADDC(sum, r9)
addi src, 0x8
oword_align: /* 16bytes */
andri.c r26, src, 0x10
beq begin_movement
lw r10, [src, 0x08]
lw r11, [src, 0x0c]
lw r8, [src, 0x00]
lw r9, [src, 0x04]
ADDC(sum, r10)
ADDC(sum, r11)
ADDC(sum, r8)
ADDC(sum, r9)
subi r5, 0x10
addi src, 0x10
begin_movement:
srli.c r26, r5, 0x7 /* len>=128? */
beq 1f /* len<128 */
/* r26 is the result that computed in oword_align */
move_128bytes:
CSUM_BIGCHUNK(src, 0x00, sum)
CSUM_BIGCHUNK(src, 0x20, sum)
CSUM_BIGCHUNK(src, 0x40, sum)
CSUM_BIGCHUNK(src, 0x60, sum)
subi.c r26, 0x01 /* r26 equals len/128 */
addi src, 0x80
bne move_128bytes
1: /* len<128,we process 64byte here */
andri.c r10, r5, 0x40
beq 1f
move_64bytes:
CSUM_BIGCHUNK(src, 0x00, sum)
CSUM_BIGCHUNK(src, 0x20, sum)
addi src, 0x40
1: /* len<64 */
andri r26, r5, 0x1c /* 0x1c=28 */
andri.c r10, r5, 0x20
beq do_end_words /* decided by andri */
move_32bytes:
CSUM_BIGCHUNK(src, 0x00, sum)
andri r26, r5, 0x1c
addri src, src, 0x20
do_end_words: /* len<32 */
/* r26 was set already in dword_align */
cmpi.c r26, 0x0
beq maybe_end_cruft /* len<28 or len<56 */
srli r26, r26, 0x2
end_words:
lw r8, [src]
subi.c r26, 0x1 /* unit is 4 byte */
ADDC(sum, r8)
addi src, 0x4
cmpi.c r26, 0x0
bne end_words /* r26!=0 */
maybe_end_cruft: /* len<4 */
andri r10, r5, 0x3
small_memcpy:
mv r5, r10
j small_csumcpy
out:
mv r4, sum
br r3
END(csum_partial)
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