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[POWERPC] Use SLB size from the device tree

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Currently we hardwire the number of SLBs to 64, but PAPR says we
should use the ibm,slb-size property to obtain the number of SLB
entries.  This uses this property instead of assuming 64.  If no
property is found, we assume 64 entries as before.

This soft patches the SLB handler, so it shouldn't change performance
at all.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Michael Neuling
2007-12-06 17:24:48 +11:00
committed by Paul Mackerras
parent 44ef339073
commit 584f8b71a2
8 changed files with 26 additions and 10 deletions
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5
arch/powerpc/mm/slb_low.S
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@ -227,8 +227,9 @@ END_FW_FTR_SECTION_IFSET(FW_FEATURE_ISERIES)
7: ld r10,PACASTABRR(r13)
addi r10,r10,1
/* use a cpu feature mask if we ever change our slb size */
cmpldi r10,SLB_NUM_ENTRIES
/* This gets soft patched on boot. */
_GLOBAL(slb_compare_rr_to_size)
cmpldi r10,0
blt+ 4f
li r10,SLB_NUM_BOLTED