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microblaze: Introduce TLB skip size

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TLB skip size direct how many TLBs is skipped.
Currently TLB0 and TLB1 are used for Linux kernel mapping
that's why their are skipped.

Signed-off-by: Michal Simek <monstr@monstr.eu>
This commit is contained in:
Michal Simek
2011-04-04 15:46:03 +02:00
parent 95b0f9ea66
commit 1451d1d88b
3 changed files with 7 additions and 5 deletions
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7
arch/microblaze/kernel/hw_exception_handler.S
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@@ -821,18 +821,19 @@ ex_handler_done:
* A common place to load the TLB.
*/
tlb_index:
.long 1 /* MS: storing last used tlb index */
/* MS: storing last used tlb index */
.long (MICROBLAZE_TLB_SKIP - 1)
finish_tlb_load:
/* MS: load the last used TLB index. */
lwi r5, r0, TOPHYS(tlb_index)
addik r5, r5, 1 /* MS: inc tlb_index -> use next one */
/* MS: FIXME this is potential fault, because this is mask not count */
andi r5, r5, (MICROBLAZE_TLB_SIZE-1)
andi r5, r5, MICROBLAZE_TLB_SIZE - 1
ori r6, r0, 1
cmp r31, r5, r6
blti r31, ex12
addik r5, r6, 1
addik r5, r6, MICROBLAZE_TLB_SKIP - 1
ex12:
/* MS: save back current TLB index */
swi r5, r0, TOPHYS(tlb_index)