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/* checksum.S: Sparc V9 optimized checksum code.
*
* Copyright(C) 1995 Linus Torvalds
* Copyright(C) 1995 Miguel de Icaza
* Copyright(C) 1996 David S. Miller
* Copyright(C) 1997 Jakub Jelinek
*
* derived from:
* Linux/Alpha checksum c-code
* Linux/ix86 inline checksum assembly
* RFC1071 Computing the Internet Checksum (esp. Jacobsons m68k code)
* David Mosberger-Tang for optimized reference c-code
* BSD4.4 portable checksum routine
*/
#include <asm/errno.h>
#include <asm/head.h>
#include <asm/ptrace.h>
#include <asm/asi.h>
#include <asm/page.h>
/* The problem with the "add with carry" instructions on Ultra
* are two fold. Firstly, they cannot pair with jack shit,
* and also they only add in the 32-bit carry condition bit
* into the accumulated sum. The following is much better.
* For larger chunks we use VIS code, which is faster ;)
*/
#define src o0
#define dst o1
#define len o2
#define sum o3
.text
/* I think I have an erection... Once _AGAIN_ the SunSoft
* engineers are caught asleep at the keyboard, tsk tsk...
*/
#define CSUMCOPY_LASTCHUNK(off, t0, t1) \
ldxa [%src - off - 0x08] %asi, t0; \
ldxa [%src - off - 0x00] %asi, t1; \
nop; nop; \
addcc t0, %sum, %sum; \
stw t0, [%dst - off - 0x04]; \
srlx t0, 32, t0; \
bcc,pt %xcc, 51f; \
stw t0, [%dst - off - 0x08]; \
add %sum, 1, %sum; \
51: addcc t1, %sum, %sum; \
stw t1, [%dst - off + 0x04]; \
srlx t1, 32, t1; \
bcc,pt %xcc, 52f; \
stw t1, [%dst - off - 0x00]; \
add %sum, 1, %sum; \
52:
cpc_start:
cc_end_cruft:
andcc %g7, 8, %g0 ! IEU1 Group
be,pn %icc, 1f ! CTI
and %g7, 4, %g5 ! IEU0
ldxa [%src + 0x00] %asi, %g2 ! Load Group
add %dst, 8, %dst ! IEU0
add %src, 8, %src ! IEU1
addcc %g2, %sum, %sum ! IEU1 Group + 2 bubbles
stw %g2, [%dst - 0x04] ! Store
srlx %g2, 32, %g2 ! IEU0
bcc,pt %xcc, 1f ! CTI Group
stw %g2, [%dst - 0x08] ! Store
add %sum, 1, %sum ! IEU0
1: brz,pt %g5, 1f ! CTI Group
clr %g2 ! IEU0
lduwa [%src + 0x00] %asi, %g2 ! Load
add %dst, 4, %dst ! IEU0 Group
add %src, 4, %src ! IEU1
stw %g2, [%dst - 0x04] ! Store Group + 2 bubbles
sllx %g2, 32, %g2 ! IEU0
1: andcc %g7, 2, %g0 ! IEU1
be,pn %icc, 1f ! CTI Group
clr %o4 ! IEU1
lduha [%src + 0x00] %asi, %o4 ! Load
add %src, 2, %src ! IEU0 Group
add %dst, 2, %dst ! IEU1
sth %o4, [%dst - 0x2] ! Store Group + 2 bubbles
sll %o4, 16, %o4 ! IEU0
1: andcc %g7, 1, %g0 ! IEU1
be,pn %icc, 1f ! CTI Group
clr %o5 ! IEU0
lduba [%src + 0x00] %asi, %o5 ! Load
stb %o5, [%dst + 0x00] ! Store Group + 2 bubbles
sll %o5, 8, %o5 ! IEU0
1: or %g2, %o4, %o4 ! IEU1
or %o5, %o4, %o4 ! IEU0 Group
addcc %o4, %sum, %sum ! IEU1
bcc,pt %xcc, ccfold ! CTI
sethi %uhi(PAGE_OFFSET), %g4 ! IEU0 Group
b,pt %xcc, ccfold ! CTI
add %sum, 1, %sum ! IEU1
cc_fixit:
cmp %len, 6 ! IEU1 Group
bl,a,pn %icc, ccte ! CTI
andcc %len, 0xf, %g7 ! IEU1 Group
andcc %src, 2, %g0 ! IEU1 Group
be,pn %icc, 1f ! CTI
andcc %src, 0x4, %g0 ! IEU1 Group
lduha [%src + 0x00] %asi, %g4 ! Load
sub %len, 2, %len ! IEU0
add %src, 2, %src ! IEU0 Group
add %dst, 2, %dst ! IEU1
sll %g4, 16, %g3 ! IEU0 Group + 1 bubble
addcc %g3, %sum, %sum ! IEU1
bcc,pt %xcc, 0f ! CTI
srl %sum, 16, %g3 ! IEU0 Group
add %g3, 1, %g3 ! IEU0 4 clocks (mispredict)
0: andcc %src, 0x4, %g0 ! IEU1 Group
sth %g4, [%dst - 0x2] ! Store
sll %sum, 16, %sum ! IEU0
sll %g3, 16, %g3 ! IEU0 Group
srl %sum, 16, %sum ! IEU0 Group
or %g3, %sum, %sum ! IEU0 Group (regdep)
1: be,pt %icc, ccmerge ! CTI
andcc %len, 0xf0, %g1 ! IEU1
lduwa [%src + 0x00] %asi, %g4 ! Load Group
sub %len, 4, %len ! IEU0
add %src, 4, %src ! IEU1
add %dst, 4, %dst ! IEU0 Group
addcc %g4, %sum, %sum ! IEU1 Group + 1 bubble
stw %g4, [%dst - 0x4] ! Store
bcc,pt %xcc, ccmerge ! CTI
andcc %len, 0xf0, %g1 ! IEU1 Group
b,pt %xcc, ccmerge ! CTI 4 clocks (mispredict)
add %sum, 1, %sum ! IEU0
.align 32
.globl csum_partial_copy_sparc64
csum_partial_copy_sparc64: /* %o0=src, %o1=dest, %o2=len, %o3=sum */
xorcc %src, %dst, %o4 ! IEU1 Group
srl %sum, 0, %sum ! IEU0
andcc %o4, 3, %g0 ! IEU1 Group
srl %len, 0, %len ! IEU0
bne,pn %icc, ccslow ! CTI
andcc %src, 1, %g0 ! IEU1 Group
bne,pn %icc, ccslow ! CTI
cmp %len, 256 ! IEU1 Group
bgeu,pt %icc, csum_partial_copy_vis ! CTI
andcc %src, 7, %g0 ! IEU1 Group
bne,pn %icc, cc_fixit ! CTI
andcc %len, 0xf0, %g1 ! IEU1 Group
ccmerge:be,pn %icc, ccte ! CTI
andcc %len, 0xf, %g7 ! IEU1 Group
sll %g1, 2, %o4 ! IEU0
13: sethi %hi(12f), %o5 ! IEU0 Group
add %src, %g1, %src ! IEU1
sub %o5, %o4, %o5 ! IEU0 Group
jmpl %o5 + %lo(12f), %g0 ! CTI Group brk forced
add %dst, %g1, %dst ! IEU0 Group
cctbl: CSUMCOPY_LASTCHUNK(0xe8,%g2,%g3)
CSUMCOPY_LASTCHUNK(0xd8,%g2,%g3)
CSUMCOPY_LASTCHUNK(0xc8,%g2,%g3)
CSUMCOPY_LASTCHUNK(0xb8,%g2,%g3)
CSUMCOPY_LASTCHUNK(0xa8,%g2,%g3)
CSUMCOPY_LASTCHUNK(0x98,%g2,%g3)
CSUMCOPY_LASTCHUNK(0x88,%g2,%g3)
CSUMCOPY_LASTCHUNK(0x78,%g2,%g3)
CSUMCOPY_LASTCHUNK(0x68,%g2,%g3)
CSUMCOPY_LASTCHUNK(0x58,%g2,%g3)
CSUMCOPY_LASTCHUNK(0x48,%g2,%g3)
CSUMCOPY_LASTCHUNK(0x38,%g2,%g3)
CSUMCOPY_LASTCHUNK(0x28,%g2,%g3)
CSUMCOPY_LASTCHUNK(0x18,%g2,%g3)
CSUMCOPY_LASTCHUNK(0x08,%g2,%g3)
12:
andcc %len, 0xf, %g7 ! IEU1 Group
ccte: bne,pn %icc, cc_end_cruft ! CTI
sethi %uhi(PAGE_OFFSET), %g4 ! IEU0
ccfold: sllx %sum, 32, %o0 ! IEU0 Group
addcc %sum, %o0, %o0 ! IEU1 Group (regdep)
srlx %o0, 32, %o0 ! IEU0 Group (regdep)
bcs,a,pn %xcc, 1f ! CTI
add %o0, 1, %o0 ! IEU1 4 clocks (mispredict)
1: retl ! CTI Group brk forced
sllx %g4, 32, %g4 ! IEU0 Group
ccslow: mov 0, %g5
brlez,pn %len, 4f
andcc %src, 1, %o5
be,a,pt %icc, 1f
srl %len, 1, %g7
sub %len, 1, %len
lduba [%src] %asi, %g5
add %src, 1, %src
stb %g5, [%dst]
srl %len, 1, %g7
add %dst, 1, %dst
1: brz,a,pn %g7, 3f
andcc %len, 1, %g0
andcc %src, 2, %g0
be,a,pt %icc, 1f
srl %g7, 1, %g7
lduha [%src] %asi, %o4
sub %len, 2, %len
srl %o4, 8, %g2
sub %g7, 1, %g7
stb %g2, [%dst]
add %o4, %g5, %g5
stb %o4, [%dst + 1]
add %src, 2, %src
srl %g7, 1, %g7
add %dst, 2, %dst
1: brz,a,pn %g7, 2f
andcc %len, 2, %g0
lduwa [%src] %asi, %o4
5: srl %o4, 24, %g2
srl %o4, 16, %g3
stb %g2, [%dst]
srl %o4, 8, %g2
stb %g3, [%dst + 1]
add %src, 4, %src
stb %g2, [%dst + 2]
addcc %o4, %g5, %g5
stb %o4, [%dst + 3]
addc %g5, %g0, %g5
add %dst, 4, %dst
subcc %g7, 1, %g7
bne,a,pt %icc, 5b
lduwa [%src] %asi, %o4
sll %g5, 16, %g2
srl %g5, 16, %g5
srl %g2, 16, %g2
andcc %len, 2, %g0
add %g2, %g5, %g5
2: be,a,pt %icc, 3f
andcc %len, 1, %g0
lduha [%src] %asi, %o4
andcc %len, 1, %g0
srl %o4, 8, %g2
add %src, 2, %src
stb %g2, [%dst]
add %g5, %o4, %g5
stb %o4, [%dst + 1]
add %dst, 2, %dst
3: be,a,pt %icc, 1f
sll %g5, 16, %o4
lduba [%src] %asi, %g2
sll %g2, 8, %o4
stb %g2, [%dst]
add %g5, %o4, %g5
sll %g5, 16, %o4
1: addcc %o4, %g5, %g5
srl %g5, 16, %o4
addc %g0, %o4, %g5
brz,pt %o5, 4f
srl %g5, 8, %o4
and %g5, 0xff, %g2
and %o4, 0xff, %o4
sll %g2, 8, %g2
or %g2, %o4, %g5
4: addcc %sum, %g5, %sum
addc %g0, %sum, %o0
retl
srl %o0, 0, %o0
cpc_end:
.globl cpc_handler
cpc_handler:
ldx [%sp + 0x7ff + 128], %g1
sub %g0, EFAULT, %g2
brnz,a,pt %g1, 1f
st %g2, [%g1]
1: sethi %uhi(PAGE_OFFSET), %g4
retl
sllx %g4, 32, %g4
.section __ex_table
.align 4
.word cpc_start, 0, cpc_end, cpc_handler
|
