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Commit 1f92f77a authored by Jungseung Lee's avatar Jungseung Lee Committed by Russell King
Browse files

ARM: 8239/1: Introduce {set,clear}_pte_bit 



Introduce helper functions for pte_mk* functions and it would be
used to change individual bits in ptes at times.

Signed-off-by: default avatarJungseung Lee <js07.lee@gmail.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 4e802cfd

arch/arm/include/asm/pgtable.h

+51 −11
Original line number Original line Diff line number Diff line
@@ -252,17 +252,57 @@ static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, 
	set_pte_ext(ptep, pteval, ext);

	set_pte_ext(ptep, pteval, ext);

}

}





#define PTE_BIT_FUNC(fn,op) \

static inline pte_t clear_pte_bit(pte_t pte, pgprot_t prot)

static inline pte_t pte_##fn(pte_t pte) { pte_val(pte) op; return pte; }

{



	pte_val(pte) &= ~pgprot_val(prot);

PTE_BIT_FUNC(wrprotect, |= L_PTE_RDONLY);

	return pte;

PTE_BIT_FUNC(mkwrite,   &= ~L_PTE_RDONLY);

}

PTE_BIT_FUNC(mkclean,   &= ~L_PTE_DIRTY);



PTE_BIT_FUNC(mkdirty,   |= L_PTE_DIRTY);

static inline pte_t set_pte_bit(pte_t pte, pgprot_t prot)

PTE_BIT_FUNC(mkold,     &= ~L_PTE_YOUNG);

{

PTE_BIT_FUNC(mkyoung,   |= L_PTE_YOUNG);

	pte_val(pte) |= pgprot_val(prot);

PTE_BIT_FUNC(mkexec,   &= ~L_PTE_XN);

	return pte;

PTE_BIT_FUNC(mknexec,   |= L_PTE_XN);

}



static inline pte_t pte_wrprotect(pte_t pte)

{

	return set_pte_bit(pte, __pgprot(L_PTE_RDONLY));

}



static inline pte_t pte_mkwrite(pte_t pte)

{

	return clear_pte_bit(pte, __pgprot(L_PTE_RDONLY));

}



static inline pte_t pte_mkclean(pte_t pte)

{

	return clear_pte_bit(pte, __pgprot(L_PTE_DIRTY));

}



static inline pte_t pte_mkdirty(pte_t pte)

{

	return set_pte_bit(pte, __pgprot(L_PTE_DIRTY));

}



static inline pte_t pte_mkold(pte_t pte)

{

	return clear_pte_bit(pte, __pgprot(L_PTE_YOUNG));

}



static inline pte_t pte_mkyoung(pte_t pte)

{

	return set_pte_bit(pte, __pgprot(L_PTE_YOUNG));

}



static inline pte_t pte_mkexec(pte_t pte)

{

	return clear_pte_bit(pte, __pgprot(L_PTE_XN));

}



static inline pte_t pte_mknexec(pte_t pte)

{

	return set_pte_bit(pte, __pgprot(L_PTE_XN));

}





static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)

static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)

{

{