/*	$Id: ovbcopy.S,v 1.1.1.1 2003/11/08 08:41:41 wlin Exp $ */#define	ABICALLS			# NO ABICALLS#include <asm.h>/* * memcpy(to, from, len) * {ov}bcopy(from, to, len) */LEAF(memcpy)	.set	noreorder	move	v0, a0			# swap from and to	move	a0, a1	move	a1, v0ALEAF(bcopy)ALEAF(ovbcopy)#ifdef GODSONEV1	.set	noreorder	move	v0,a1	bltu	a0,a1,2f	nop	addu	a0,a2	addu	a1,a21:	bgez	a2,3f	addiu	a2,-1	lb	t0,-1(a0)	sb	t0,-1(a1)	addiu	a0,-1	b	1b	addiu	a1,-12:	bgez	a2,3f	addiu	a2,-1	lb	t0,0(a0)	sb	t0,0(a1)	addiu	a0,1	b	2b	addiu	a1,13:	j	ra	nop	#else	.set	noreorder	addu	t0, a0, a2		# t0 = end of s1 region	sltu	t1, a1, t0	sltu	t2, a0, a1	and	t1, t1, t2		# t1 = true if from < to < (from+len)	beq	t1, zero, forward	# non overlapping, do forward copy	slt	t2, a2, 12		# check for small copy	ble	a2, zero, 2f	addu	t1, a1, a2		# t1 = end of to region1:	lb	v1, -1(t0)		# copy bytes backwards,	subu	t0, t0, 1		#   doesnt happen often so do slow way	subu	t1, t1, 1	bne	t0, a0, 1b	sb	v1, 0(t1)2:	j	ra	nopforward:	bne	t2, zero, smallcpy	# do a small bcopy	xor	v1, a0, a1		# compare low two bits of addresses	and	v1, v1, 3	subu	a3, zero, a1		# compute # bytes to word align address	beq	v1, zero, aligned	# addresses can be word aligned	and	a3, a3, 3	beq	a3, zero, 1f	subu	a2, a2, a3		# subtract from remaining count	LWHI	v1, 0(a0)		# get next 4 bytes (unaligned)	LWLO	v1, 3(a0)	addu	a0, a0, a3	SWHI	v1, 0(a1)		# store 1, 2, or 3 bytes to align a1	addu	a1, a1, a31:	and	v1, a2, 3		# compute number of words left	subu	a3, a2, v1	move	a2, v1	addu	a3, a3, a0		# compute ending address2:	LWHI	v1, 0(a0)		# copy words a0 unaligned, a1 aligned	LWLO	v1, 3(a0)	addu	a0, a0, 4	sw	v1, 0(a1)	addu	a1, a1, 4	bne	a0, a3, 2b	nop				# We have to do this mmu-bug.	b	smallcpy	nopaligned:	beq	a3, zero, 1f	subu	a2, a2, a3		# subtract from remaining count	LWHI	v1, 0(a0)		# copy 1, 2, or 3 bytes to align	addu	a0, a0, a3	SWHI	v1, 0(a1)	addu	a1, a1, a31:	and	v1, a2, 3		# compute number of whole words left	subu	a3, a2, v1	move	a2, v1	addu	a3, a3, a0		# compute ending address2:	lw	v1, 0(a0)		# copy words	addu	a0, a0, 4	sw	v1, 0(a1)	bne	a0, a3, 2b	addu	a1, a1, 4smallcpy:	ble	a2, zero, 2f	addu	a3, a2, a0		# compute ending address1:	lbu	v1, 0(a0)		# copy bytes	addu	a0, a0, 1	sb	v1, 0(a1)	bne	a0, a3, 1b	addu	a1, a1, 1	# MMU BUG ? can not do -1(a1) at 0x80000000!!2:	j	ra	nop#endifEND(memcpy)