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sh: Acquire some more page flags for SH-5.

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We need some more page flags to hook up _PAGE_WIRED (and eventually
other things). So use the unused PTE bits above the PPN field as no
implementations use these for anything currently.

Now that we have _PAGE_WIRED let's provide the SH-5 functions for wiring
up TLB entries.

Signed-off-by: Matt Fleming <matt@console-pimps.org>
This commit is contained in:
Matt Fleming
2009-11-19 21:11:05 +00:00
parent 8eda551420
commit 24ef7fc4dc
4 changed files with 57 additions and 3 deletions
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15
arch/sh/include/asm/pgtable_64.h
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@@ -123,8 +123,21 @@ static __inline__ void set_pte(pte_t *pteptr, pte_t pteval)
#define _PAGE_DIRTY 0x400 /* software: page accessed in write */
#define _PAGE_ACCESSED 0x800 /* software: page referenced */
/* Wrapper for extended mode pgprot twiddling */
#define _PAGE_EXT(x) ((unsigned long long)(x) << 32)
/*
* We can use the sign-extended bits in the PTEL to get 32 bits of
* software flags. This works for now because no implementations uses
* anything above the PPN field.
*/
#define _PAGE_WIRED _PAGE_EXT(0x001) /* software: wire the tlb entry */
#define _PAGE_CLEAR_FLAGS (_PAGE_PRESENT | _PAGE_FILE | _PAGE_SHARED | \
_PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_WIRED)
/* Mask which drops software flags */
#define _PAGE_FLAGS_HARDWARE_MASK 0xfffffffffffff3dbLL
#define _PAGE_FLAGS_HARDWARE_MASK (NEFF_MASK & ~(_PAGE_CLEAR_FLAGS))
/*
* HugeTLB support