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sh: New extended page flag to wire/unwire TLB entries

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Provide a new extended page flag, _PAGE_WIRED and an SH4 implementation
for wiring TLB entries and use it in the fixmap code path so that we can
wire the fixmap TLB entry.

Signed-off-by: Matt Fleming <matt@console-pimps.org>
This commit is contained in:
Matt Fleming
2009-11-17 21:05:31 +00:00
parent 7dcaa8e8e6
commit 8eda551420
5 changed files with 156 additions and 0 deletions
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4
arch/sh/include/asm/pgtable_32.h
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@ -71,6 +71,8 @@
#define _PAGE_EXT_KERN_WRITE 0x1000 /* EPR4-bit: Kernel space writable */
#define _PAGE_EXT_KERN_READ 0x2000 /* EPR5-bit: Kernel space readable */
#define _PAGE_EXT_WIRED 0x4000 /* software: Wire TLB entry */
/* Wrapper for extended mode pgprot twiddling */
#define _PAGE_EXT(x) ((unsigned long long)(x) << 32)
@ -164,6 +166,8 @@ static inline unsigned long copy_ptea_attributes(unsigned long x)
(PTE_MASK | _PAGE_ACCESSED | _PAGE_CACHABLE | \
_PAGE_DIRTY | _PAGE_SPECIAL)
#define _PAGE_WIRED (_PAGE_EXT(_PAGE_EXT_WIRED))
#ifndef __ASSEMBLY__
#if defined(CONFIG_X2TLB) /* SH-X2 TLB */