summaryrefslogtreecommitdiffstats
path: root/kernel/arch/frv/lib/insl_sw.S
blob: 9b5aa95d069b2a72bccb413f6d0ff69a563a7818 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
/* insl_sw.S: input array of 4b words from device port with byte swapping
 *
 * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.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.
 */


        .text
        .p2align	4

###############################################################################
#
# void __insl_sw(unsigned int port, void *buf, int n)
#
###############################################################################
        .globl		__insl_sw
        .type		__insl_sw,@function
__insl_sw:
	subi.p		gr9,#1,gr9
	setlos		#1,gr4
0:
	ldi.p		@(gr8,#0),gr5		; get 0xAABBCCDD
	subicc		gr10,#1,gr10,icc0

	stbu.p		gr5,@(gr9,gr4)		; write 0xDD
	srli		gr5,#8,gr5
	stbu.p		gr5,@(gr9,gr4)		; write 0xCC
	srli		gr5,#8,gr5
	stbu.p		gr5,@(gr9,gr4)		; write 0xBB
	srli		gr5,#8,gr5
	stbu.p		gr5,@(gr9,gr4)		; write 0xAA
	bhi		icc0,#2,0b
	bralr

	.size		__insl_sw, .-__insl_sw