pgtable.h

来自「Linux Kernel 2.6.9 for OMAP1710」· C头文件 代码 · 共 443 行 · 第 1/2 页

#define __S111	PAGE_SHARED

#ifndef __ASSEMBLY__

extern unsigned long phys_base;
extern unsigned long pfn_base;

extern struct page *mem_map_zero;
#define ZERO_PAGE(vaddr)	(mem_map_zero)

/* PFNs are real physical page numbers.  However, mem_map only begins to record
 * per-page information starting at pfn_base.  This is to handle systems where
 * the first physical page in the machine is at some huge physical address, such
 * as 4GB.   This is common on a partitioned E10000, for example.
 */

#define pfn_pte(pfn, prot)	\
	__pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot) | _PAGE_SZBITS)
#define mk_pte(page, pgprot)	pfn_pte(page_to_pfn(page), (pgprot))

#define pte_pfn(x)		((pte_val(x) & _PAGE_PADDR)>>PAGE_SHIFT)
#define pte_page(x)		pfn_to_page(pte_pfn(x))

#define page_pte_prot(page, prot)	mk_pte(page, prot)
#define page_pte(page)			page_pte_prot(page, __pgprot(0))

static inline pte_t pte_modify(pte_t orig_pte, pgprot_t new_prot)
{
	pte_t __pte;
	const unsigned long preserve_mask = (_PFN_MASK |
					     _PAGE_MODIFIED | _PAGE_ACCESSED |
					     _PAGE_CACHE | _PAGE_E |
					     _PAGE_PRESENT | _PAGE_SZBITS);

	pte_val(__pte) = (pte_val(orig_pte) & preserve_mask) |
		(pgprot_val(new_prot) & ~preserve_mask);

	return __pte;
}
#define pmd_set(pmdp, ptep)	\
	(pmd_val(*(pmdp)) = (__pa((unsigned long) (ptep)) >> 11UL))
#define pgd_set(pgdp, pmdp)	\
	(pgd_val(*(pgdp)) = (__pa((unsigned long) (pmdp)) >> 11UL))
#define __pmd_page(pmd)		\
	((unsigned long) __va((((unsigned long)pmd_val(pmd))<<11UL)))
#define pmd_page(pmd) 			virt_to_page((void *)__pmd_page(pmd))
#define pgd_page(pgd)		\
	((unsigned long) __va((((unsigned long)pgd_val(pgd))<<11UL)))
#define pte_none(pte) 			(!pte_val(pte))
#define pte_present(pte)		(pte_val(pte) & _PAGE_PRESENT)
#define pmd_none(pmd)			(!pmd_val(pmd))
#define pmd_bad(pmd)			(0)
#define pmd_present(pmd)		(pmd_val(pmd) != 0U)
#define pmd_clear(pmdp)			(pmd_val(*(pmdp)) = 0U)
#define pgd_none(pgd)			(!pgd_val(pgd))
#define pgd_bad(pgd)			(0)
#define pgd_present(pgd)		(pgd_val(pgd) != 0U)
#define pgd_clear(pgdp)			(pgd_val(*(pgdp)) = 0U)

/* The following only work if pte_present() is true.
 * Undefined behaviour if not..
 */
#define pte_read(pte)		(pte_val(pte) & _PAGE_READ)
#define pte_exec(pte)		(pte_val(pte) & _PAGE_EXEC)
#define pte_write(pte)		(pte_val(pte) & _PAGE_WRITE)
#define pte_dirty(pte)		(pte_val(pte) & _PAGE_MODIFIED)
#define pte_young(pte)		(pte_val(pte) & _PAGE_ACCESSED)
#define pte_wrprotect(pte)	(__pte(pte_val(pte) & ~(_PAGE_WRITE|_PAGE_W)))
#define pte_rdprotect(pte)	\
	(__pte(((pte_val(pte)<<1UL)>>1UL) & ~_PAGE_READ))
#define pte_mkclean(pte)	\
	(__pte(pte_val(pte) & ~(_PAGE_MODIFIED|_PAGE_W)))
#define pte_mkold(pte)		\
	(__pte(((pte_val(pte)<<1UL)>>1UL) & ~_PAGE_ACCESSED))

/* Permanent address of a page. */
#define __page_address(page)	page_address(page)

/* Be very careful when you change these three, they are delicate. */
#define pte_mkyoung(pte)	(__pte(pte_val(pte) | _PAGE_ACCESSED | _PAGE_R))
#define pte_mkwrite(pte)	(__pte(pte_val(pte) | _PAGE_WRITE))
#define pte_mkdirty(pte)	(__pte(pte_val(pte) | _PAGE_MODIFIED | _PAGE_W))

/* to find an entry in a page-table-directory. */
#define pgd_index(address)	(((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD))
#define pgd_offset(mm, address)	((mm)->pgd + pgd_index(address))

/* to find an entry in a kernel page-table-directory */
#define pgd_offset_k(address) pgd_offset(&init_mm, address)

/* Find an entry in the second-level page table.. */
#define pmd_offset(dir, address)	\
	((pmd_t *) pgd_page(*(dir)) + \
	 ((address >> PMD_SHIFT) & (REAL_PTRS_PER_PMD-1)))

/* Find an entry in the third-level page table.. */
#define pte_index(dir, address)	\
	((pte_t *) __pmd_page(*(dir)) + \
	 ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)))
#define pte_offset_kernel		pte_index
#define pte_offset_map			pte_index
#define pte_offset_map_nested		pte_index
#define pte_unmap(pte)			do { } while (0)
#define pte_unmap_nested(pte)		do { } while (0)

/* Actual page table PTE updates.  */
extern void tlb_batch_add(pte_t *ptep, pte_t orig);

static inline void set_pte(pte_t *ptep, pte_t pte)
{
	pte_t orig = *ptep;

	*ptep = pte;
	if (pte_present(orig))
		tlb_batch_add(ptep, orig);
}

#define pte_clear(ptep)		set_pte((ptep), __pte(0UL))

extern pgd_t swapper_pg_dir[1];

/* These do nothing with the way I have things setup. */
#define mmu_lockarea(vaddr, len)		(vaddr)
#define mmu_unlockarea(vaddr, len)		do { } while(0)

struct vm_area_struct;
extern void update_mmu_cache(struct vm_area_struct *, unsigned long, pte_t);

/* Make a non-present pseudo-TTE. */
static inline pte_t mk_pte_io(unsigned long page, pgprot_t prot, int space)
{
	pte_t pte;
	pte_val(pte) = (((page) | pgprot_val(prot) | _PAGE_E) &
			~(unsigned long)_PAGE_CACHE);
	pte_val(pte) |= (((unsigned long)space) << 32);
	return pte;
}

/* Encode and de-code a swap entry */
#define __swp_type(entry)	(((entry).val >> PAGE_SHIFT) & 0xffUL)
#define __swp_offset(entry)	((entry).val >> (PAGE_SHIFT + 8UL))
#define __swp_entry(type, offset)	\
	( (swp_entry_t) \
	  { \
		(((long)(type) << PAGE_SHIFT) | \
                 ((long)(offset) << (PAGE_SHIFT + 8UL))) \
	  } )
#define __pte_to_swp_entry(pte)		((swp_entry_t) { pte_val(pte) })
#define __swp_entry_to_pte(x)		((pte_t) { (x).val })

/* File offset in PTE support. */
#define pte_file(pte)		(pte_val(pte) & _PAGE_FILE)
#define pte_to_pgoff(pte)	(pte_val(pte) >> PAGE_SHIFT)
#define pgoff_to_pte(off)	(__pte(((off) << PAGE_SHIFT) | _PAGE_FILE))
#define PTE_FILE_MAX_BITS	(64UL - PAGE_SHIFT - 1UL)

extern unsigned long prom_virt_to_phys(unsigned long, int *);

static __inline__ unsigned long
sun4u_get_pte (unsigned long addr)
{
	pgd_t *pgdp;
	pmd_t *pmdp;
	pte_t *ptep;

	if (addr >= PAGE_OFFSET)
		return addr & _PAGE_PADDR;
	if ((addr >= LOW_OBP_ADDRESS) && (addr < HI_OBP_ADDRESS))
		return prom_virt_to_phys(addr, NULL);
	pgdp = pgd_offset_k(addr);
	pmdp = pmd_offset(pgdp, addr);
	ptep = pte_offset_kernel(pmdp, addr);
	return pte_val(*ptep) & _PAGE_PADDR;
}

static __inline__ unsigned long
__get_phys (unsigned long addr)
{
	return sun4u_get_pte (addr);
}

static __inline__ int
__get_iospace (unsigned long addr)
{
	return ((sun4u_get_pte (addr) & 0xf0000000) >> 28);
}

extern unsigned long *sparc64_valid_addr_bitmap;

/* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
#define kern_addr_valid(addr)	\
	(test_bit(__pa((unsigned long)(addr))>>22, sparc64_valid_addr_bitmap))

extern int io_remap_page_range(struct vm_area_struct *vma, unsigned long from,
			       unsigned long offset,
			       unsigned long size, pgprot_t prot, int space);

#include <asm-generic/pgtable.h>

/* We provide our own get_unmapped_area to cope with VA holes for userland */
#define HAVE_ARCH_UNMAPPED_AREA

/* We provide a special get_unmapped_area for framebuffer mmaps to try and use
 * the largest alignment possible such that larget PTEs can be used.
 */
extern unsigned long get_fb_unmapped_area(struct file *filp, unsigned long,
					  unsigned long, unsigned long,
					  unsigned long);
#define HAVE_ARCH_FB_UNMAPPED_AREA

/*
 * No page table caches to initialise
 */
#define pgtable_cache_init()	do { } while (0)

extern void check_pgt_cache(void);

#endif /* !(__ASSEMBLY__) */

#endif /* !(_SPARC64_PGTABLE_H) */