| /* 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 |