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[SPARC64]: Create a seperate kernel TSB for 4MB/256MB mappings.

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It can map all of the linear kernel mappings with zero TSB hash
conflicts for systems with 16GB or less ram.  In such cases, on
SUN4V, once we load up this TSB the first time with all the
mappings, we never take a linear kernel mapping TLB miss ever
again, the hypervisor handles them all.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
2006-02-21 22:31:11 -08:00
committed by David S. Miller
parent 9cc3a1ac9a
commit d7744a0950
3 changed files with 48 additions and 6 deletions
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15
arch/sparc64/kernel/ktlb.S
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@@ -121,6 +121,12 @@ kvmap_dtlb_obp:
nop
.align 32
kvmap_dtlb_tsb4m_load:
KTSB_LOCK_TAG(%g1, %g2, %g7)
KTSB_WRITE(%g1, %g5, %g6)
ba,pt %xcc, kvmap_dtlb_load
nop
kvmap_dtlb:
/* %g6: TAG TARGET */
mov TLB_TAG_ACCESS, %g4
@@ -133,6 +139,13 @@ kvmap_dtlb_4v:
brgez,pn %g4, kvmap_dtlb_nonlinear
nop
/* Correct TAG_TARGET is already in %g6, check 4mb TSB. */
KERN_TSB4M_LOOKUP_TL1(%g6, %g5, %g1, %g2, %g3, kvmap_dtlb_load)
/* TSB entry address left in %g1, lookup linear PTE.
* Must preserve %g1 and %g6 (TAG).
*/
kvmap_dtlb_tsb4m_miss:
sethi %hi(kpte_linear_bitmap), %g2
or %g2, %lo(kpte_linear_bitmap), %g2
@@ -163,7 +176,7 @@ kvmap_dtlb_4v:
.globl kvmap_linear_patch
kvmap_linear_patch:
ba,pt %xcc, kvmap_dtlb_load
ba,pt %xcc, kvmap_dtlb_tsb4m_load
xor %g2, %g4, %g5
kvmap_dtlb_vmalloc_addr: