diff options
| author | Helge Deller <deller@gmx.de> | 2009-02-05 02:06:00 +0300 |
|---|---|---|
| committer | Kyle McMartin <kyle@mcmartin.ca> | 2009-03-31 06:51:33 +0400 |
| commit | afca2523876301cc6130fc3cc402173eeeb89830 (patch) | |
| tree | 1c4e64a6d3b133f13cadbe999fce3d275acb2e37 /arch/parisc/kernel/entry.S | |
| parent | 445c088f88d63db49598390be3525252d211688f (diff) | |
| download | linux-afca2523876301cc6130fc3cc402173eeeb89830.tar.xz | |
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.S | 25 |
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 |