aboutsummaryrefslogtreecommitdiffstats
path: root/arch/powerpc/sysdev/dcr-low.S
blob: d3098ef1404a2df72738bd1e01e51dda3f185227 (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
41
42
43
44
45
/*
 * "Indirect" DCR access
 *
 * Copyright (c) 2004 Eugene Surovegin <ebs@ebshome.net>
 *
 * 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.
 */

#include <asm/ppc_asm.h>
#include <asm/processor.h>
#include <asm/bug.h>

#define DCR_ACCESS_PROLOG(table) \
	cmpli	cr0,r3,1024;	 \
	rlwinm  r3,r3,4,18,27;   \
	lis     r5,table@h;      \
	ori     r5,r5,table@l;   \
	add     r3,r3,r5;        \
	bge-	1f;		 \
	mtctr   r3;              \
	bctr;			 \
1:	trap;			 \
	EMIT_BUG_ENTRY 1b,__FILE__,__LINE__,0;	\
	blr

_GLOBAL(__mfdcr)
	DCR_ACCESS_PROLOG(__mfdcr_table)

_GLOBAL(__mtdcr)
	DCR_ACCESS_PROLOG(__mtdcr_table)

__mfdcr_table:
	mfdcr  r3,0; blr
__mtdcr_table:
	mtdcr  0,r4; blr

dcr     = 1
        .rept   1023
	mfdcr   r3,dcr; blr
	mtdcr   dcr,r4; blr
	dcr     = dcr + 1
	.endr