6d2170be45
This adds supports to the "extended" DCR addressing via the indirect mfdcrx/mtdcrx instructions supported by some 4xx cores (440H6 and later). I enabled the feature for now only on AMCC 460 chips. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Acked-by: Josh Boyer <jwboyer@linux.vnet.ibm.com> Acked-by: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
45 lines
983 B
ArmAsm
45 lines
983 B
ArmAsm
/*
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* "Indirect" DCR access
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*
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* Copyright (c) 2004 Eugene Surovegin <ebs@ebshome.net>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <asm/ppc_asm.h>
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#include <asm/processor.h>
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#include <asm/bug.h>
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#define DCR_ACCESS_PROLOG(table) \
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cmpli cr0,r3,1024; \
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rlwinm r3,r3,4,18,27; \
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lis r5,table@h; \
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ori r5,r5,table@l; \
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add r3,r3,r5; \
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bge- 1f; \
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mtctr r3; \
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bctr; \
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1: trap; \
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EMIT_BUG_ENTRY 1b,__FILE__,__LINE__,0; \
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blr
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_GLOBAL(__mfdcr)
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DCR_ACCESS_PROLOG(__mfdcr_table)
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_GLOBAL(__mtdcr)
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DCR_ACCESS_PROLOG(__mtdcr_table)
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__mfdcr_table:
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mfdcr r3,0; blr
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__mtdcr_table:
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mtdcr 0,r4; blr
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dcr = 1
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.rept 1023
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mfdcr r3,dcr; blr
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mtdcr dcr,r4; blr
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dcr = dcr + 1
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.endr
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