}
#endif
-struct kmem_cache *pmd_cache;
-
-void __init pgtable_cache_init(void)
-{
- if (PTRS_PER_PMD > 1) {
- pmd_cache = kmem_cache_create("pmd",
- PTRS_PER_PMD*sizeof(pmd_t),
- PTRS_PER_PMD*sizeof(pmd_t),
- SLAB_PANIC,
- pmd_ctor);
- }
-}
-
/*
* This function cannot be __init, since exceptions don't work in that
* section. Put this after the callers, so that it cannot be inlined.
return pte;
}
-void pmd_ctor(struct kmem_cache *cache, void *pmd)
-{
- memset(pmd, 0, PTRS_PER_PMD*sizeof(pmd_t));
-}
-
/*
* List of all pgd's needed for non-PAE so it can invalidate entries
* in both cached and uncached pgd's; not needed for PAE since the
if (SHARED_KERNEL_PMD)
return;
- paravirt_release_pd(__pa(pgd) >> PAGE_SHIFT);
spin_lock_irqsave(&pgd_lock, flags);
pgd_list_del(pgd);
spin_unlock_irqrestore(&pgd_lock, flags);
}
#endif /* CONFIG_X86_PAE */
-/* If we allocate a pmd for part of the kernel address space, then
- make sure its initialized with the appropriate kernel mappings.
- Otherwise use a cached zeroed pmd. */
-static pmd_t *pmd_cache_alloc(int idx)
-{
- pmd_t *pmd;
-
- if (idx >= USER_PTRS_PER_PGD) {
- pmd = (pmd_t *)__get_free_page(GFP_KERNEL);
-
- if (pmd)
- memcpy(pmd,
- (void *)pgd_page_vaddr(swapper_pg_dir[idx]),
- sizeof(pmd_t) * PTRS_PER_PMD);
- } else
- pmd = kmem_cache_alloc(pmd_cache, GFP_KERNEL);
-
- return pmd;
-}
-
-static void pmd_cache_free(pmd_t *pmd, int idx)
-{
- if (idx >= USER_PTRS_PER_PGD)
- free_page((unsigned long)pmd);
- else
- kmem_cache_free(pmd_cache, pmd);
-}
-
pgd_t *pgd_alloc(struct mm_struct *mm)
{
- int i;
pgd_t *pgd = quicklist_alloc(0, GFP_KERNEL, pgd_ctor);
- if (PTRS_PER_PMD == 1 || !pgd)
- return pgd;
-
mm->pgd = pgd; /* so that alloc_pd can use it */
- for (i = 0; i < UNSHARED_PTRS_PER_PGD; ++i) {
- pmd_t *pmd = pmd_cache_alloc(i);
-
- if (!pmd)
- goto out_oom;
-
- paravirt_alloc_pd(mm, __pa(pmd) >> PAGE_SHIFT);
- set_pgd(&pgd[i], __pgd(1 + __pa(pmd)));
- }
if (pgd && !pgd_prepopulate_pmd(mm, pgd)) {
quicklist_free(0, pgd_dtor, pgd);
pgd = NULL;
}
return pgd;
-
-out_oom:
- for (i--; i >= 0; i--) {
- pgd_t pgdent = pgd[i];
- void* pmd = (void *)__va(pgd_val(pgdent)-1);
- paravirt_release_pd(__pa(pmd) >> PAGE_SHIFT);
- pmd_cache_free(pmd, i);
- }
- quicklist_free(0, pgd_dtor, pgd);
- return NULL;
}
void pgd_free(pgd_t *pgd)
{
- int i;
-
- /* in the PAE case user pgd entries are overwritten before usage */
- if (PTRS_PER_PMD > 1)
- for (i = 0; i < UNSHARED_PTRS_PER_PGD; ++i) {
- pgd_t pgdent = pgd[i];
- void* pmd = (void *)__va(pgd_val(pgdent)-1);
- paravirt_release_pd(__pa(pmd) >> PAGE_SHIFT);
- pmd_cache_free(pmd, i);
- }
- /* in the non-PAE case, free_pgtables() clears user pgd entries */
pgd_mop_up_pmds(pgd);
quicklist_free(0, pgd_dtor, pgd);
}
*/
static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
{
- BUG();
- return (pmd_t *)2;
+ return (pmd_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
}
static inline void pmd_free(pmd_t *pmd)
{
+ BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
+ free_page((unsigned long)pmd);
}
static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd)
{
+ paravirt_release_pd(__pa(pmd) >> PAGE_SHIFT);
+ tlb_remove_page(tlb, virt_to_page(pmd));
}
-static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
+static inline void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd)
{
- BUG();
+ paravirt_alloc_pd(mm, __pa(pmd) >> PAGE_SHIFT);
+
+ /* Note: almost everything apart from _PAGE_PRESENT is
+ reserved at the pmd (PDPT) level. */
+ set_pud(pudp, __pud(__pa(pmd) | _PAGE_PRESENT));
+
+ /*
+ * Pentium-II erratum A13: in PAE mode we explicitly have to flush
+ * the TLB via cr3 if the top-level pgd is changed...
+ */
+ if (mm == current->active_mm)
+ write_cr3(read_cr3());
}
#endif /* CONFIG_X86_PAE */
#define pgd_ERROR(e) \
printk("%s:%d: bad pgd %p(%016Lx).\n", __FILE__, __LINE__, &(e), pgd_val(e))
-#define pud_none(pud) 0
-#define pud_bad(pud) 0
-#define pud_present(pud) 1
+
+static inline int pud_none(pud_t pud)
+{
+ return pud_val(pud) == 0;
+}
+static inline int pud_bad(pud_t pud)
+{
+ return (pud_val(pud) & ~(PTE_MASK | _KERNPG_TABLE | _PAGE_USER)) != 0;
+}
+static inline int pud_present(pud_t pud)
+{
+ return pud_val(pud) & _PAGE_PRESENT;
+}
/* Rules for using set_pte: the pte being assigned *must* be
* either not present or in a state where the hardware will
}
static inline void native_set_pud(pud_t *pudp, pud_t pud)
{
- *pudp = pud;
+ set_64bit((unsigned long long *)(pudp),native_pud_val(pud));
}
/*
*(tmp + 1) = 0;
}
-/*
- * Pentium-II erratum A13: in PAE mode we explicitly have to flush
- * the TLB via cr3 if the top-level pgd is changed...
- * We do not let the generic code free and clear pgd entries due to
- * this erratum.
- */
-static inline void pud_clear (pud_t * pud) { }
+static inline void pud_clear(pud_t *pudp)
+{
+ set_pud(pudp, __pud(0));
+
+ /*
+ * Pentium-II erratum A13: in PAE mode we explicitly have to flush
+ * the TLB via cr3 if the top-level pgd is changed...
+ *
+ * XXX I don't think we need to worry about this here, since
+ * when clearing the pud, the calling code needs to flush the
+ * tlb anyway. But do it now for safety's sake. - jsgf
+ */
+ write_cr3(read_cr3());
+}
#define pud_page(pud) \
((struct page *) __va(pud_val(pud) & PAGE_MASK))
extern struct page *pgd_list;
void check_pgt_cache(void);
-void pmd_ctor(struct kmem_cache *, void *);
-void pgtable_cache_init(void);
+static inline void pgtable_cache_init(void) {}
void paging_init(void);
projects / linux-2.6-omap-h63xx.git / commitdiff