1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * "Indirect" DCR access 4 * 5 * Copyright (c) 2004 Eugene Surovegin <ebs@ebshome.net> 6 */ 7 8 #include <linux/export.h> 9 #include <asm/ppc_asm.h> 10 #include <asm/processor.h> 11 #include <asm/bug.h> 12 13 #define DCR_ACCESS_PROLOG(table) \ 14 cmplwi 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
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