arch/powerpc/include/asm/book3s/32/pgtable.h

Source file repositories/reference/linux-study-clean/arch/powerpc/include/asm/book3s/32/pgtable.h

File Facts

System
Linux kernel
Corpus path
arch/powerpc/include/asm/book3s/32/pgtable.h
Extension
.h
Size
18717 bytes
Lines
614
Domain
Architecture Layer
Bucket
arch/powerpc
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

static inline int pte_dirty(pte_t pte)		{ return !!(pte_val(pte) & _PAGE_DIRTY); }
static inline int pte_young(pte_t pte)		{ return !!(pte_val(pte) & _PAGE_ACCESSED); }
static inline int pte_special(pte_t pte)	{ return !!(pte_val(pte) & _PAGE_SPECIAL); }
static inline int pte_none(pte_t pte)		{ return (pte_val(pte) & ~_PTE_NONE_MASK) == 0; }
static inline bool pte_exec(pte_t pte)		{ return pte_val(pte) & _PAGE_EXEC; }

static inline int pte_present(pte_t pte)
{
	return pte_val(pte) & _PAGE_PRESENT;
}

static inline bool pte_hw_valid(pte_t pte)
{
	return pte_val(pte) & _PAGE_PRESENT;
}

static inline bool pte_hashpte(pte_t pte)
{
	return !!(pte_val(pte) & _PAGE_HASHPTE);
}

static inline bool pte_ci(pte_t pte)
{
	return !!(pte_val(pte) & _PAGE_NO_CACHE);
}

/*
 * We only find page table entry in the last level
 * Hence no need for other accessors
 */
#define pte_access_permitted pte_access_permitted
static inline bool pte_access_permitted(pte_t pte, bool write)
{
	/*
	 * A read-only access is controlled by _PAGE_READ bit.
	 * We have _PAGE_READ set for WRITE
	 */
	if (!pte_present(pte) || !pte_read(pte))
		return false;

	if (write && !pte_write(pte))
		return false;

	return true;
}

static inline bool pte_user_accessible_page(struct mm_struct *mm, unsigned long addr, pte_t pte)
{
	return pte_present(pte) && !is_kernel_addr(addr);
}

/* Conversion functions: convert a page and protection to a page entry,
 * and a page entry and page directory to the page they refer to.
 *
 * Even if PTEs can be unsigned long long, a PFN is always an unsigned
 * long for now.
 */
static inline pte_t pfn_pte(unsigned long pfn, pgprot_t pgprot)
{
	return __pte(((pte_basic_t)(pfn) << PTE_RPN_SHIFT) |
		     pgprot_val(pgprot));
}

/* Generic modifiers for PTE bits */
static inline pte_t pte_wrprotect(pte_t pte)
{
	return __pte(pte_val(pte) & ~_PAGE_WRITE);
}

static inline pte_t pte_exprotect(pte_t pte)
{
	return __pte(pte_val(pte) & ~_PAGE_EXEC);
}

static inline pte_t pte_mkclean(pte_t pte)
{
	return __pte(pte_val(pte) & ~_PAGE_DIRTY);
}

static inline pte_t pte_mkold(pte_t pte)
{
	return __pte(pte_val(pte) & ~_PAGE_ACCESSED);
}

static inline pte_t pte_mkexec(pte_t pte)
{
	return __pte(pte_val(pte) | _PAGE_EXEC);
}

static inline pte_t pte_mkpte(pte_t pte)

Annotation

Implementation Notes