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powerpc/4xx: Extended DCR support v2

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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>
This commit is contained in:
Benjamin Herrenschmidt
2008-12-18 19:13:22 +00:00
committed by Paul Mackerras
parent fecba96268
commit 6d2170be45
4 changed files with 65 additions and 17 deletions
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8
arch/powerpc/sysdev/dcr-low.S
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@ -11,14 +11,20 @@
#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
bctr; \
1: trap; \
EMIT_BUG_ENTRY 1b,__FILE__,__LINE__,0; \
blr
_GLOBAL(__mfdcr)
DCR_ACCESS_PROLOG(__mfdcr_table)