/* | |
* "Indirect" DCR access | |
* | |
* Copyright (c) 2004 Eugene Surovegin <ebs@ebshome.net> | |
* | |
* This program is free software; you can redistribute it and/or modify it | |
* under the terms of the GNU General Public License as published by the | |
* Free Software Foundation; either version 2 of the License, or (at your | |
* option) any later version. | |
*/ | |
#include <asm/ppc_asm.h> | |
#include <asm/processor.h> | |
#include <asm/bug.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) | |
_GLOBAL(__mtdcr) | |
DCR_ACCESS_PROLOG(__mtdcr_table) | |
__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 |