1/* SPDX-License-Identifier: GPL-2.0-or-later */
 2/*
 3 * "Indirect" DCR access
 4 *
 5 * Copyright (c) 2004 Eugene Surovegin <ebs@ebshome.net>
 
 
 
 
 
 6 */
 7
 8#include <linux/export.h>
 9#include <asm/ppc_asm.h>
10#include <asm/processor.h>
11#include <asm/bug.h>
12
13#define DCR_ACCESS_PROLOG(table) \
14	cmplwi	cr0,r3,1024;	 \
15	rlwinm  r3,r3,4,18,27;   \
16	lis     r5,table@h;      \
17	ori     r5,r5,table@l;   \
18	add     r3,r3,r5;        \
19	bge-	1f;		 \
20	mtctr   r3;              \
21	bctr;			 \
221:	trap;			 \
23	EMIT_BUG_ENTRY 1b,__FILE__,__LINE__,0;	\
24	blr
25
26_GLOBAL(__mfdcr)
27	DCR_ACCESS_PROLOG(__mfdcr_table)
28EXPORT_SYMBOL(__mfdcr)
29
30_GLOBAL(__mtdcr)
31	DCR_ACCESS_PROLOG(__mtdcr_table)
32EXPORT_SYMBOL(__mtdcr)
33
34__mfdcr_table:
35	mfdcr  r3,0; blr
36__mtdcr_table:
37	mtdcr  0,r4; blr
38
39dcr     = 1
40        .rept   1023
41	mfdcr   r3,dcr; blr
42	mtdcr   dcr,r4; blr
43	dcr     = dcr + 1
44	.endr

 
 1/*
 2 * "Indirect" DCR access
 3 *
 4 * Copyright (c) 2004 Eugene Surovegin <ebs@ebshome.net>
 5 *
 6 * This program is free software; you can redistribute it and/or modify it
 7 * under  the terms of  the GNU General Public License as published by the
 8 * Free Software Foundation;  either version 2 of the License, or (at your
 9 * option) any later version.
10 */
11
 
12#include <asm/ppc_asm.h>
13#include <asm/processor.h>
14#include <asm/bug.h>
15
16#define DCR_ACCESS_PROLOG(table) \
17	cmpli	cr0,r3,1024;	 \
18	rlwinm  r3,r3,4,18,27;   \
19	lis     r5,table@h;      \
20	ori     r5,r5,table@l;   \
21	add     r3,r3,r5;        \
22	bge-	1f;		 \
23	mtctr   r3;              \
24	bctr;			 \
251:	trap;			 \
26	EMIT_BUG_ENTRY 1b,__FILE__,__LINE__,0;	\
27	blr
28
29_GLOBAL(__mfdcr)
30	DCR_ACCESS_PROLOG(__mfdcr_table)
 
31
32_GLOBAL(__mtdcr)
33	DCR_ACCESS_PROLOG(__mtdcr_table)
 
34
35__mfdcr_table:
36	mfdcr  r3,0; blr
37__mtdcr_table:
38	mtdcr  0,r4; blr
39
40dcr     = 1
41        .rept   1023
42	mfdcr   r3,dcr; blr
43	mtdcr   dcr,r4; blr
44	dcr     = dcr + 1
45	.endr