1 files changed, 105 insertions, 0 deletions

diff --git a/include/asm-x86_64/pgalloc.h b/include/asm-x86_64/pgalloc.h
new file mode 100644
index 000000000000..deadd146978b
--- /dev/null
+++ b/include/asm-x86_64/pgalloc.h
@@ -0,0 +1,105 @@
+#ifndef _X86_64_PGALLOC_H
+#define _X86_64_PGALLOC_H
+
+#include <asm/fixmap.h>
+#include <asm/pda.h>
+#include <linux/threads.h>
+#include <linux/mm.h>
+
+#define pmd_populate_kernel(mm, pmd, pte) \
+                set_pmd(pmd, __pmd(_PAGE_TABLE | __pa(pte)))
+#define pud_populate(mm, pud, pmd) \
+                set_pud(pud, __pud(_PAGE_TABLE | __pa(pmd)))
+#define pgd_populate(mm, pgd, pud) \
+                set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(pud)))
+
+static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *pte)
+{
+        set_pmd(pmd, __pmd(_PAGE_TABLE | (page_to_pfn(pte) << PAGE_SHIFT)));
+}
+
+extern __inline__ pmd_t *get_pmd(void)
+{
+        return (pmd_t *)get_zeroed_page(GFP_KERNEL);
+}
+
+extern __inline__ void pmd_free(pmd_t *pmd)
+{
+        BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
+        free_page((unsigned long)pmd);
+}
+
+static inline pmd_t *pmd_alloc_one (struct mm_struct *mm, unsigned long addr)
+{
+        return (pmd_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
+}
+
+static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
+{
+        return (pud_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
+}
+
+static inline void pud_free (pud_t *pud)
+{
+        BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
+        free_page((unsigned long)pud);
+}
+
+static inline pgd_t *pgd_alloc(struct mm_struct *mm)
+{
+        unsigned boundary;
+        pgd_t *pgd = (pgd_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT);
+        if (!pgd)
+                return NULL;
+        /*
+         * Copy kernel pointers in from init.
+         * Could keep a freelist or slab cache of those because the kernel
+         * part never changes.
+         */
+        boundary = pgd_index(__PAGE_OFFSET);
+        memset(pgd, 0, boundary * sizeof(pgd_t));
+        memcpy(pgd + boundary,
+               init_level4_pgt + boundary,
+               (PTRS_PER_PGD - boundary) * sizeof(pgd_t));
+        return pgd;
+}
+
+static inline void pgd_free(pgd_t *pgd)
+{
+        BUG_ON((unsigned long)pgd & (PAGE_SIZE-1));
+        free_page((unsigned long)pgd);
+}
+
+static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
+{
+        return (pte_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
+}
+
+static inline struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address)
+{
+        void *p = (void *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
+        if (!p)
+                return NULL;
+        return virt_to_page(p);
+}
+
+/* Should really implement gc for free page table pages. This could be
+   done with a reference count in struct page. */
+
+extern __inline__ void pte_free_kernel(pte_t *pte)
+{
+        BUG_ON((unsigned long)pte & (PAGE_SIZE-1));
+        free_page((unsigned long)pte); 
+}
+
+extern inline void pte_free(struct page *pte)
+{
+        __free_page(pte);
+} 
+
+#define __pte_free_tlb(tlb,pte) tlb_remove_page((tlb),(pte))
+
+#define __pmd_free_tlb(tlb,x)   tlb_remove_page((tlb),virt_to_page(x))
+#define __pud_free_tlb(tlb,x)   tlb_remove_page((tlb),virt_to_page(x))
+
+#endif /* _X86_64_PGALLOC_H */