| David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame^] | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 2 | /* |
| 3 | * "Indirect" DCR access |
| 4 | * |
| 5 | * Copyright (c) 2004 Eugene Surovegin <ebs@ebshome.net> |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 6 | */ |
| 7 | |
| 8 | #include <asm/ppc_asm.h> |
| 9 | #include <asm/processor.h> |
| 10 | #include <asm/bug.h> |
| 11 | #include <asm/export.h> |
| 12 | |
| 13 | #define DCR_ACCESS_PROLOG(table) \ |
| 14 | cmpli 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 |