Re: [microblaze-uclinux] xenet_FifoSend(struct sk_buff *orig_skb,structnet_device*dev)

["Jim Law" <jlaw@xxxxxxxxxxxxx>]

Hi,

Sorry for that - rushing too much.

Here's a real one - I tested it this time then built it into the kernel and 
it seems to work after replacing the call to memmove() with a call to 
move_halfword_higher() in FifoRecvHandler() in 
drivers/net/xilinx_enet/adapter.c.

You had mentioned drivers/net/xilinx_emac/adapter.c in your previous email, 
but my uClinux-2.4.x doesn't seem to have that directory.  I am not using 
the emaclite, although I assume there is a similar place there that this new 
function might be useful.

Regards,

Jim

----- Original Message ----- 
From: "Brettschneider Falk" <fbrettschneider@xxxxxxxxxxxxxxx>
To: <microblaze-uclinux@xxxxxxxxxxxxxx>
Sent: Wednesday, April 30, 2008 2:43 AM
Subject: RE: [microblaze-uclinux] xenet_FifoSend(struct sk_buff 
*orig_skb,structnet_device*dev)


> Hi,
> it doesn't compile at bneid 1b. Looking at your assly_memcpy1.S it seems 
> to me the countdown of r9 is missing, but my assembler skills aint good 
> enough.
> Cheers, Falk
>
> ___________________________
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> Project Home Page : http://www.itee.uq.edu.au/~jwilliams/mblaze-uclinux
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> http://www.itee.uq.edu.au/~listarch/microblaze-uclinux/
###################################-*-asm*- 
# 
# Copyright 2008 (c) Jim Law - Iris LP  All rights reserved. 
# 
# This file is subject to the terms and conditions of the GNU General
# Public License.  See the file COPYING in the main directory of this
# archive for more details.
#
# Written by Jim Law <jlaw@xxxxxxxxxxxxx>
#  
# application specific memory move for the MB xilinx enet
# adapter.c code
# 
#
# assly_movhalf.S 
# 
# Attempt at quicker utility for adapter.c for MicroBlaze
#	Input :	Operand1 in Reg r5 - dest must be 2 bytes higher than src
#		Operand2 in Reg r6 - src must be word aligned
#		Operand3 in Reg r7 - number of bytes to move
#	Output: Result in Reg r3 - starting destination address
#			
# 
# Explanation:
# 	- moves a block 2 locations higher in memory
#	- will overwrite an extra 2 to 7 bytes at end of dest memory,
#	  depending on length of move
#
#
#######################################

#include <asm/clinkage.h>

	.globl	C_SYMBOL_NAME(move_halfword_higher)
	.ent	C_SYMBOL_NAME(move_halfword_higher)

C_SYMBOL_NAME(move_halfword_higher):
	addik	r3,r5,0		# save dest address as return value

	addik	r7,r7,-1	# c = c-1
	andi	r7,r7,0xfffffffc	# c = c & ~3
	addik	r7,r7,4		# c = c+4

	andi	r5,r5,0xfffffffc	# d = d & ~3
	addik	r10,r0,0	# h = 0
	addik	r6,r6,-4	# s--

1:	lw	r11,r6,r7	# v = *(s + offset)
	bslli	r4,r11,16	# temp = v << 16
	or	r4,r4,r10	# temp = temp | h
	sw	r4,r5,r7	# *(d + offset) = temp
	addik	r7,r7,-4	# offset--
	bneid	r7,1b
	bsrli	r10,r11,16	# h = v >> 16 (IN DELAY SLOT)

	sw	r10,r5,r7	# *(d + offset) = h
	
	rtsd	r15,8
	nop

.end C_SYMBOL_NAME(move_halfword_higher)