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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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16
arch/sh/include/asm/tlb.h
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@ -97,6 +97,22 @@ tlb_end_vma(struct mmu_gather *tlb, struct vm_area_struct *vma)
#define tlb_migrate_finish(mm) do { } while (0)
#ifdef CONFIG_CPU_SH4
extern void tlb_wire_entry(struct vm_area_struct *, unsigned long, pte_t);
extern void tlb_unwire_entry(void);
#else
static inline void tlb_wire_entry(struct vm_area_struct *vma ,
unsigned long addr, pte_t pte)
{
BUG();
}
static inline void tlb_unwire_entry(void)
{
BUG();
}
#endif /* CONFIG_CPU_SH4 */
#else /* CONFIG_MMU */
#define tlb_start_vma(tlb, vma) do { } while (0)