diff options
Diffstat (limited to 'arch/score/lib/checksum.S')
| -rw-r--r-- | arch/score/lib/checksum.S | 255 |
1 files changed, 255 insertions, 0 deletions
diff --git a/arch/score/lib/checksum.S b/arch/score/lib/checksum.S new file mode 100644 index 00000000000..706157edc7d --- /dev/null +++ b/arch/score/lib/checksum.S @@ -0,0 +1,255 @@ +/* + * 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) |