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authorHelge Deller <deller@gmx.de>2009-02-05 00:06:00 +0100
committerKyle McMartin <kyle@mcmartin.ca>2009-03-31 02:51:33 +0000
commitafca2523876301cc6130fc3cc402173eeeb89830 (patch)
tree1c4e64a6d3b133f13cadbe999fce3d275acb2e37 /arch/parisc/kernel/entry.S
parent445c088f88d63db49598390be3525252d211688f (diff)
parisc: allow to build with 16k default kernel page size
Introduce new convert_for_tlb_insert20 macro and use it to replace assembler statements with hardcoded constants. This change allows the parisc64 kernel to boot with 16kb default kernel page size, aka CONFIG_PARISC_PAGE_SIZE_16KB=y. Signed-off-by: Helge Deller <deller@gmx.de> Signed-off-by: Kyle McMartin <kyle@mcmartin.ca>
Diffstat (limited to 'arch/parisc/kernel/entry.S')
-rw-r--r--arch/parisc/kernel/entry.S25
1 files changed, 17 insertions, 8 deletions
diff --git a/arch/parisc/kernel/entry.S b/arch/parisc/kernel/entry.S
index 0f7ff938b06a..4e9dd15e076c 100644
--- a/arch/parisc/kernel/entry.S
+++ b/arch/parisc/kernel/entry.S
@@ -505,6 +505,18 @@
STREG \pte,0(\ptep)
.endm
+ /* bitshift difference between a PFN (based on kernel's PAGE_SIZE)
+ * to a CPU TLB 4k PFN (4k => 12 bits to shift) */
+ #define PAGE_ADD_SHIFT (PAGE_SHIFT-12)
+
+ /* Drop prot bits and convert to page addr for iitlbt and idtlbt */
+ .macro convert_for_tlb_insert20 pte
+ extrd,u \pte,(63-ASM_PFN_PTE_SHIFT)+(63-58)+PAGE_ADD_SHIFT,\
+ 64-PAGE_SHIFT-PAGE_ADD_SHIFT,\pte
+ depdi _PAGE_SIZE_ENCODING_DEFAULT,63,\
+ (63-58)+PAGE_ADD_SHIFT,\pte
+ .endm
+
/* Convert the pte and prot to tlb insertion values. How
* this happens is quite subtle, read below */
.macro make_insert_tlb spc,pte,prot
@@ -544,8 +556,7 @@
depi 1,12,1,\prot
/* Drop prot bits and convert to page addr for iitlbt and idtlbt */
- extrd,u \pte,(63-ASM_PFN_PTE_SHIFT)+(63-58),64-PAGE_SHIFT,\pte
- depdi _PAGE_SIZE_ENCODING_DEFAULT,63,63-58,\pte
+ convert_for_tlb_insert20 \pte
.endm
/* Identical macro to make_insert_tlb above, except it
@@ -1244,10 +1255,9 @@ nadtlb_check_flush_20w:
depdi,z 7,7,3,prot
depdi 1,10,1,prot
- /* Get rid of prot bits and convert to page addr for idtlbt */
+ /* Drop prot bits from pte and convert to page addr for idtlbt */
+ convert_for_tlb_insert20 pte
- depdi 0,63,12,pte
- extrd,u pte,56,52,pte
idtlbt pte,prot
rfir
@@ -1403,10 +1413,9 @@ nadtlb_check_flush_20:
depdi,z 7,7,3,prot
depdi 1,10,1,prot
- /* Get rid of prot bits and convert to page addr for idtlbt */
+ /* Drop prot bits from pte and convert to page addr for idtlbt */
+ convert_for_tlb_insert20 pte
- depdi 0,63,12,pte
- extrd,u pte,56,32,pte
idtlbt pte,prot
rfir