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Much faster copyin/copyout subroutines, written by Ken Wellsch.

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Improved user-space network I/O (like ftp) with about 1.7 times!
This commit is contained in:
ragge 1996-02-13 17:45:32 +00:00
parent eebcc06b89
commit 2395bee98d
1 changed files with 54 additions and 46 deletions
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100
sys/arch/vax/vax/subr.s
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@ -1,4 +1,4 @@
/* $NetBSD: subr.s,v 1.14 1996/02/02 18:09:05 mycroft Exp $ */
/* $NetBSD: subr.s,v 1.15 1996/02/13 17:45:32 ragge Exp $ */
/*
* Copyright (c) 1994 Ludd, University of Lule}, Sweden.
@ -117,57 +117,65 @@ _badaddr: .word 0x0
ret
#
# copyin(from, to, len) copies from userspace to kernelspace.
# Speeded up locopyin/locopyout written by Ken Wellsch.
#
# locopyin (from, to, len, addr) copies from userspace to kernelspace.
# addr is iftrap addr for faulting.
#
.globl _locopyin
.align 2
_locopyin: .word 0x3c # save R2|R3|R4|R5
movl 4(ap),r4 # stash userspace address
movl 12(ap),r3 # and length in case of fault?
brb copyio
#
# locopyout (from, to, len, addr) copies from kernelspace to userspace.
# addr is iftrap addr for faulting.
#
.globl _locopyout
.align 2
_locopyout: .word 0x3c # save R2|R3|R4|R5
movl 8(ap),r4 # stash userspace address
movl 12(ap),r3 # and length in case of fault?
copyio:
movl 12(ap),r2 # len
beql 5f
.globl _locopyin
_locopyin:.word 0x1c
movl 16(ap),r0 # Get fault pointer flag
movl $ci,(r0)
movl $cio,(r0) # and stuff return address into it
movl 4(ap),r0 # from
movl 8(ap),r1 # to
movl 12(ap),r2 # len
movl 4(ap),r0 # from
movl 8(ap),r1 # to
movl r0,r4
movl r2,r3
ashl $-3,r2,r5 # convert length to quad words
beql 2f
1:
movq (r0)+,(r1)+ # do the copying in large hunks
sobgtr r5,1b # (although movc3 is twice as fast
# alas movc5 clobbers [r0-r5] thus
# damaging the magic r3/r4 pair)
2:
bicl3 $-8,r2,r5 # compute trailing bytes (<=7)
beql 4f
3:
movb (r0)+,(r1)+
sobgtr r5,3b
4:
movl 16(ap),r0 # remove fault address
clrl (r0)
5:
clrl r0 # flag the successful operation
cio:
ret
tstl r2
beql 3f
2: movb (r0)+,(r1)+ # XXX Should be done in a faster way.
decl r2
bneq 2b
3: movl 16(ap),r0
clrl (r0)
clrl r0
ci: ret
#
# locopyout(from, to, len, addr) in the same manner as copyin()
# addr is iftrap addr for faulting.
#
.globl _locopyout
_locopyout:.word 0x1c
movl 16(ap),r0 # Get fault pointer flag
movl $co,(r0) # and save ret addr
movl 4(ap),r0 # from
movl 8(ap),r1 # to
movl 12(ap),r2 # len
movl r1,r4
movl r2,r3
tstl r2
beql 3f
2: movb (r0)+,(r1)+ # XXX Should be done in a faster way.
decl r2
bneq 2b
3: movl 16(ap),r0
clrl (r0)
clrl r0
co: ret
#
# copystr(from, to, maxlen, *copied, addr)