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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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41
arch/sh/include/asm/tlb.h
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@@ -11,6 +11,7 @@
#ifdef CONFIG_MMU
#include <asm/pgalloc.h>
#include <asm/tlbflush.h>
#include <asm/mmu_context.h>
/*
* TLB handling. This allows us to remove pages from the page
@@ -100,6 +101,46 @@ tlb_end_vma(struct mmu_gather *tlb, struct vm_area_struct *vma)
#ifdef CONFIG_CPU_SH4
extern void tlb_wire_entry(struct vm_area_struct *, unsigned long, pte_t);
extern void tlb_unwire_entry(void);
#elif defined(CONFIG_SUPERH64)
static int dtlb_entry;
static unsigned long long dtlb_entries[64];
static inline void tlb_wire_entry(struct vm_area_struct *vma,
unsigned long addr, pte_t pte)
{
unsigned long long entry;
unsigned long paddr, flags;
BUG_ON(dtlb_entry == 64);
local_irq_save(flags);
entry = sh64_get_wired_dtlb_entry();
dtlb_entries[dtlb_entry++] = entry;
paddr = pte_val(pte) & _PAGE_FLAGS_HARDWARE_MASK;
paddr &= ~PAGE_MASK;
sh64_setup_tlb_slot(entry, addr, get_asid(), paddr);
local_irq_restore(flags);
}
static inline void tlb_unwire_entry(void)
{
unsigned long long entry;
unsigned long flags;
BUG_ON(!dtlb_entry);
local_irq_save(flags);
entry = dtlb_entries[dtlb_entry--];
sh64_teardown_tlb_slot(entry);
sh64_put_wired_dtlb_entry(entry);
local_irq_restore(flags);
}
#else
static inline void tlb_wire_entry(struct vm_area_struct *vma ,
unsigned long addr, pte_t pte)