projects / deliverable / linux.git / blame
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|---|---|---|
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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> | |
| 6d2170be | 14 | #include <asm/bug.h> |
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15 | |
| 16 | #define DCR_ACCESS_PROLOG(table) \ | |
| 6d2170be | 17 | cmpli cr0,r3,1024; \ |
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18 | rlwinm r3,r3,4,18,27; \ |
| 19 | lis r5,table@h; \ | |
| 20 | ori r5,r5,table@l; \ | |
| 21 | add r3,r3,r5; \ | |
| 6d2170be | 22 | bge- 1f; \ |
| 4c75a6f4 | 23 | mtctr r3; \ |
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24 | bctr; \ |
| 25 | 1: trap; \ | |
| 26 | EMIT_BUG_ENTRY 1b,__FILE__,__LINE__,0; \ | |
| 27 | blr | |
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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 | ||
| 40 | dcr = 1 | |
| 41 | .rept 1023 | |
| 42 | mfdcr r3,dcr; blr | |
| 43 | mtdcr dcr,r4; blr | |
| 44 | dcr = dcr + 1 | |
| 45 | .endr |