pgalloc.h
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:4k
- #ifndef __ASM_SH_PGALLOC_H
- #define __ASM_SH_PGALLOC_H
- #include <asm/processor.h>
- #include <linux/threads.h>
- #include <linux/slab.h>
- #define pgd_quicklist ((unsigned long *)0)
- #define pmd_quicklist ((unsigned long *)0)
- #define pte_quicklist ((unsigned long *)0)
- #define pgtable_cache_size 0L
- #define pmd_populate(mm, pmd, pte)
- set_pmd(pmd, __pmd(_PAGE_TABLE + __pa(pte)))
- /*
- * Allocate and free page tables.
- */
- static inline pgd_t *pgd_alloc(struct mm_struct *mm)
- {
- unsigned int pgd_size = (USER_PTRS_PER_PGD * sizeof(pgd_t));
- pgd_t *pgd = (pgd_t *)kmalloc(pgd_size, GFP_KERNEL);
- if (pgd)
- memset(pgd, 0, pgd_size);
- return pgd;
- }
- static inline void pgd_free(pgd_t *pgd)
- {
- kfree(pgd);
- }
- static inline pte_t *pte_alloc_one(struct mm_struct *mm, unsigned long address)
- {
- pte_t *pte = (pte_t *) __get_free_page(GFP_KERNEL);
- if (pte)
- clear_page(pte);
- return pte;
- }
- static inline pte_t *pte_alloc_one_fast(struct mm_struct *mm, unsigned long address)
- {
- return 0;
- }
- static inline void pte_free_slow(pte_t *pte)
- {
- free_page((unsigned long)pte);
- }
- #define pte_free(pte) pte_free_slow(pte)
- /*
- * allocating and freeing a pmd is trivial: the 1-entry pmd is
- * inside the pgd, so has no extra memory associated with it.
- */
- static inline void pmd_free(pmd_t * pmd)
- {
- }
- #define pmd_alloc_one_fast(mm, addr) ({ BUG(); ((pmd_t *)1); })
- #define pmd_alloc_one(mm, addr) ({ BUG(); ((pmd_t *)2); })
- #define pmd_free_slow(x) do { } while (0)
- #define pmd_free_fast(x) do { } while (0)
- #define pmd_free(x) do { } while (0)
- #define pgd_populate(mm, pmd, pte) BUG()
- /* Do nothing */
- static inline int do_check_pgt_cache(int low, int high) { }
- /*
- * TLB flushing:
- *
- * - flush_tlb() flushes the current mm struct TLBs
- * - flush_tlb_all() flushes all processes TLBs
- * - flush_tlb_mm(mm) flushes the specified mm context TLB's
- * - flush_tlb_page(vma, vmaddr) flushes one page
- * - flush_tlb_range(mm, start, end) flushes a range of pages
- * - flush_tlb_pgtables(mm, start, end) flushes a range of page tables
- */
- extern void flush_tlb(void);
- extern void flush_tlb_all(void);
- extern void flush_tlb_mm(struct mm_struct *mm);
- extern void flush_tlb_range(struct mm_struct *mm, unsigned long start,
- unsigned long end);
- extern void flush_tlb_page(struct vm_area_struct *vma, unsigned long page);
- extern void __flush_tlb_page(unsigned long asid, unsigned long page);
- static inline void flush_tlb_pgtables(struct mm_struct *mm,
- unsigned long start, unsigned long end)
- { /* Nothing to do */
- }
- #if defined(__SH4__)
- /*
- * For SH-4, we have our own implementation for ptep_get_and_clear
- */
- static inline pte_t ptep_get_and_clear(pte_t *ptep)
- {
- pte_t pte = *ptep;
- pte_clear(ptep);
- if (!pte_not_present(pte)) {
- struct page *page = pte_page(pte);
- if (VALID_PAGE(page)&&
- (!page->mapping || !(page->mapping->i_mmap_shared)))
- __clear_bit(PG_mapped, &page->flags);
- }
- return pte;
- }
- #else
- static inline pte_t ptep_get_and_clear(pte_t *ptep)
- {
- pte_t pte = *ptep;
- pte_clear(ptep);
- return pte;
- }
- #endif
- /*
- * Following functions are same as generic ones.
- */
- static inline int ptep_test_and_clear_young(pte_t *ptep)
- {
- pte_t pte = *ptep;
- if (!pte_young(pte))
- return 0;
- set_pte(ptep, pte_mkold(pte));
- return 1;
- }
- static inline int ptep_test_and_clear_dirty(pte_t *ptep)
- {
- pte_t pte = *ptep;
- if (!pte_dirty(pte))
- return 0;
- set_pte(ptep, pte_mkclean(pte));
- return 1;
- }
- static inline void ptep_set_wrprotect(pte_t *ptep)
- {
- pte_t old_pte = *ptep;
- set_pte(ptep, pte_wrprotect(old_pte));
- }
- static inline void ptep_mkdirty(pte_t *ptep)
- {
- pte_t old_pte = *ptep;
- set_pte(ptep, pte_mkdirty(old_pte));
- }
- #endif /* __ASM_SH_PGALLOC_H */