| /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| /* |
| * "Indirect" DCR access |
| * |
| * Copyright (c) 2004 Eugene Surovegin <ebs@ebshome.net> |
| */ |
| |
| #include <asm/ppc_asm.h> |
| #include <asm/processor.h> |
| #include <asm/bug.h> |
| #include <asm/export.h> |
| |
| #define DCR_ACCESS_PROLOG(table) \ |
| cmpli cr0,r3,1024; \ |
| rlwinm r3,r3,4,18,27; \ |
| lis r5,table@h; \ |
| ori r5,r5,table@l; \ |
| add r3,r3,r5; \ |
| bge- 1f; \ |
| mtctr r3; \ |
| bctr; \ |
| 1: trap; \ |
| EMIT_BUG_ENTRY 1b,__FILE__,__LINE__,0; \ |
| blr |
| |
| _GLOBAL(__mfdcr) |
| DCR_ACCESS_PROLOG(__mfdcr_table) |
| EXPORT_SYMBOL(__mfdcr) |
| |
| _GLOBAL(__mtdcr) |
| DCR_ACCESS_PROLOG(__mtdcr_table) |
| EXPORT_SYMBOL(__mtdcr) |
| |
| __mfdcr_table: |
| mfdcr r3,0; blr |
| __mtdcr_table: |
| mtdcr 0,r4; blr |
| |
| dcr = 1 |
| .rept 1023 |
| mfdcr r3,dcr; blr |
| mtdcr dcr,r4; blr |
| dcr = dcr + 1 |
| .endr |
