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; \ |
22 | 1: trap; \ |
23 | EMIT_BUG_ENTRY 1b,__FILE__,__LINE__,0; \ |
24 | blr |
25 | |
26 | _GLOBAL(__mfdcr) |
27 | DCR_ACCESS_PROLOG(__mfdcr_table) |
28 | EXPORT_SYMBOL(__mfdcr) |
29 | |
30 | _GLOBAL(__mtdcr) |
31 | DCR_ACCESS_PROLOG(__mtdcr_table) |
32 | EXPORT_SYMBOL(__mtdcr) |
33 | |
34 | __mfdcr_table: |
35 | mfdcr r3,0; blr |
36 | __mtdcr_table: |
37 | mtdcr 0,r4; blr |
38 | |
39 | dcr = 1 |
40 | .rept 1023 |
41 | mfdcr r3,dcr; blr |
42 | mtdcr dcr,r4; blr |
43 | dcr = dcr + 1 |
44 | .endr |
45 | |