projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 2874c5fd | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| 4c75a6f4 BH |
2 | /* |
| 3 | * "Indirect" DCR access | |
| 4 | * | |
| 5 | * Copyright (c) 2004 Eugene Surovegin <ebs@ebshome.net> | |
| 4c75a6f4 BH |
6 | */ |
| 7 | ||
| 8 | #include <asm/ppc_asm.h> | |
| 9 | #include <asm/processor.h> | |
| 6d2170be | 10 | #include <asm/bug.h> |
| 9445aa1a | 11 | #include <asm/export.h> |
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12 | |
| 13 | #define DCR_ACCESS_PROLOG(table) \ | |
| 6d2170be | 14 | cmpli cr0,r3,1024; \ |
| 4c75a6f4 BH |
15 | rlwinm r3,r3,4,18,27; \ |
| 16 | lis r5,table@h; \ | |
| 17 | ori r5,r5,table@l; \ | |
| 18 | add r3,r3,r5; \ | |
| 6d2170be | 19 | bge- 1f; \ |
| 4c75a6f4 | 20 | mtctr r3; \ |
| 6d2170be BH |
21 | bctr; \ |
| 22 | 1: trap; \ | |
| 23 | EMIT_BUG_ENTRY 1b,__FILE__,__LINE__,0; \ | |
| 24 | blr | |
| 4c75a6f4 BH |
25 | |
| 26 | _GLOBAL(__mfdcr) | |
| 27 | DCR_ACCESS_PROLOG(__mfdcr_table) | |
| 9445aa1a | 28 | EXPORT_SYMBOL(__mfdcr) |
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29 | |
| 30 | _GLOBAL(__mtdcr) | |
| 31 | DCR_ACCESS_PROLOG(__mtdcr_table) | |
| 9445aa1a | 32 | EXPORT_SYMBOL(__mtdcr) |
| 4c75a6f4 BH |
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 |