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arm64: Introduce {set,clear}_pte_bit

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It's useful to be able to change individual bits in ptes at times.
Introduce functions for this and update existing pte_mk* functions
to use these primatives.

Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Laura Abbott <lauraa@codeaurora.org>
[will: added missing inline keyword for new header functions]
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Laura Abbott 2014-08-19 20:41:42 +01:00 committed by Will Deacon
parent 5e05153144
commit b6d4f2800b
1 changed files with 19 additions and 14 deletions
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33
arch/arm64/include/asm/pgtable.h
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@ -149,46 +149,51 @@ extern struct page *empty_zero_page;
#define pte_valid_not_user(pte) \
((pte_val(pte) & (PTE_VALID | PTE_USER)) == PTE_VALID)
static inline pte_t clear_pte_bit(pte_t pte, pgprot_t prot)
{
pte_val(pte) &= ~pgprot_val(prot);
return pte;
}
static inline pte_t set_pte_bit(pte_t pte, pgprot_t prot)
{
pte_val(pte) |= pgprot_val(prot);
return pte;
}
static inline pte_t pte_wrprotect(pte_t pte)
{
pte_val(pte) &= ~PTE_WRITE;
return pte;
return clear_pte_bit(pte, __pgprot(PTE_WRITE));
}
static inline pte_t pte_mkwrite(pte_t pte)
{
pte_val(pte) |= PTE_WRITE;
return pte;
return set_pte_bit(pte, __pgprot(PTE_WRITE));
}
static inline pte_t pte_mkclean(pte_t pte)
{
pte_val(pte) &= ~PTE_DIRTY;
return pte;
return clear_pte_bit(pte, __pgprot(PTE_DIRTY));
}
static inline pte_t pte_mkdirty(pte_t pte)
{
pte_val(pte) |= PTE_DIRTY;
return pte;
return set_pte_bit(pte, __pgprot(PTE_DIRTY));
}
static inline pte_t pte_mkold(pte_t pte)
{
pte_val(pte) &= ~PTE_AF;
return pte;
return clear_pte_bit(pte, __pgprot(PTE_AF));
}
static inline pte_t pte_mkyoung(pte_t pte)
{
pte_val(pte) |= PTE_AF;
return pte;
return set_pte_bit(pte, __pgprot(PTE_AF));
}
static inline pte_t pte_mkspecial(pte_t pte)
{
pte_val(pte) |= PTE_SPECIAL;
return pte;
return set_pte_bit(pte, __pgprot(PTE_SPECIAL));
}
static inline void set_pte(pte_t *ptep, pte_t pte)