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Diffstat (limited to 'arch/powerpc/sysdev/dcr-low.S')
-rw-r--r-- | arch/powerpc/sysdev/dcr-low.S | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/arch/powerpc/sysdev/dcr-low.S b/arch/powerpc/sysdev/dcr-low.S new file mode 100644 index 000000000000..2078f39e2f17 --- /dev/null +++ b/arch/powerpc/sysdev/dcr-low.S | |||
@@ -0,0 +1,39 @@ | |||
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 | |||
15 | #define DCR_ACCESS_PROLOG(table) \ | ||
16 | rlwinm r3,r3,4,18,27; \ | ||
17 | lis r5,table@h; \ | ||
18 | ori r5,r5,table@l; \ | ||
19 | add r3,r3,r5; \ | ||
20 | mtctr r3; \ | ||
21 | bctr | ||
22 | |||
23 | _GLOBAL(__mfdcr) | ||
24 | DCR_ACCESS_PROLOG(__mfdcr_table) | ||
25 | |||
26 | _GLOBAL(__mtdcr) | ||
27 | DCR_ACCESS_PROLOG(__mtdcr_table) | ||
28 | |||
29 | __mfdcr_table: | ||
30 | mfdcr r3,0; blr | ||
31 | __mtdcr_table: | ||
32 | mtdcr 0,r4; blr | ||
33 | |||
34 | dcr = 1 | ||
35 | .rept 1023 | ||
36 | mfdcr r3,dcr; blr | ||
37 | mtdcr dcr,r4; blr | ||
38 | dcr = dcr + 1 | ||
39 | .endr | ||