1/* 2 * "Indirect" DCR access 3 * 4 * Copyright (c) 2004 Eugene Surovegin <ebs@ebshome.net> 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License as published by the 8 * Free Software Foundation; either version 2 of the License, or (at your 9 * option) any later version. 10 */ 11 12#include <asm/ppc_asm.h> 13#include <asm/processor.h> 14#include <asm/bug.h> 15#include <asm/export.h> 16 17#define DCR_ACCESS_PROLOG(table) \ 18 cmpli cr0,r3,1024; \ 19 rlwinm r3,r3,4,18,27; \ 20 lis r5,table@h; \ 21 ori r5,r5,table@l; \ 22 add r3,r3,r5; \ 23 bge- 1f; \ 24 mtctr r3; \ 25 bctr; \ 261: trap; \ 27 EMIT_BUG_ENTRY 1b,__FILE__,__LINE__,0; \ 28 blr 29 30_GLOBAL(__mfdcr) 31 DCR_ACCESS_PROLOG(__mfdcr_table) 32EXPORT_SYMBOL(__mfdcr) 33 34_GLOBAL(__mtdcr) 35 DCR_ACCESS_PROLOG(__mtdcr_table) 36EXPORT_SYMBOL(__mtdcr) 37 38__mfdcr_table: 39 mfdcr r3,0; blr 40__mtdcr_table: 41 mtdcr 0,r4; blr 42 43dcr = 1 44 .rept 1023 45 mfdcr r3,dcr; blr 46 mtdcr dcr,r4; blr 47 dcr = dcr + 1 48 .endr 49