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1da177e4 LT |
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 | ||
36 | dcr = 1 | |
37 | .rept 1023 | |
38 | mfdcr r3,dcr; blr | |
39 | mtdcr dcr,r4; blr | |
40 | dcr = dcr + 1 | |
41 | .endr |