Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/*
2 * arch/ppc/syslib/dcr.S
3 *
4 * "Indirect" DCR access
5 *
6 * Copyright (c) 2004 Eugene Surovegin <ebs@ebshome.net>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 */
13
14#include <asm/ppc_asm.h>
15#include <asm/processor.h>
16
17#define DCR_ACCESS_PROLOG(table) \
18 rlwinm r3,r3,4,18,27; \
19 lis r5,table@h; \
20 ori r5,r5,table@l; \
21 add r3,r3,r5; \
22 mtctr r3; \
23 bctr
24
25_GLOBAL(__mfdcr)
26 DCR_ACCESS_PROLOG(__mfdcr_table)
27
28_GLOBAL(__mtdcr)
29 DCR_ACCESS_PROLOG(__mtdcr_table)
30
31__mfdcr_table:
32 mfdcr r3,0; blr
33__mtdcr_table:
34 mtdcr 0,r4; blr
35
36dcr = 1
37 .rept 1023
38 mfdcr r3,dcr; blr
39 mtdcr dcr,r4; blr
40 dcr = dcr + 1
41 .endr