1#ifndef _ASM_X86_PGALLOC_H
  2#define _ASM_X86_PGALLOC_H
  3
  4#include <linux/threads.h>
  5#include <linux/mm.h>		/* for struct page */
  6#include <linux/pagemap.h>
  7
  8static inline int  __paravirt_pgd_alloc(struct mm_struct *mm) { return 0; }
  9
 10#ifdef CONFIG_PARAVIRT
 11#include <asm/paravirt.h>
 12#else
 13#define paravirt_pgd_alloc(mm)	__paravirt_pgd_alloc(mm)
 14static inline void paravirt_pgd_free(struct mm_struct *mm, pgd_t *pgd) {}
 15static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn)	{}
 16static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn)	{}
 17static inline void paravirt_alloc_pmd_clone(unsigned long pfn, unsigned long clonepfn,
 18					    unsigned long start, unsigned long count) {}
 19static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn)	{}
 20static inline void paravirt_release_pte(unsigned long pfn) {}
 21static inline void paravirt_release_pmd(unsigned long pfn) {}
 22static inline void paravirt_release_pud(unsigned long pfn) {}
 23#endif
 24
 25/*
 26 * Flags to use when allocating a user page table page.
 27 */
 28extern gfp_t __userpte_alloc_gfp;
 29
 30/*
 31 * Allocate and free page tables.
 32 */
 33extern pgd_t *pgd_alloc(struct mm_struct *);
 34extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
 35
 36extern pte_t *pte_alloc_one_kernel(struct mm_struct *, unsigned long);
 37extern pgtable_t pte_alloc_one(struct mm_struct *, unsigned long);
 38
 39/* Should really implement gc for free page table pages. This could be
 40   done with a reference count in struct page. */
 41
 42static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
 43{
 44	BUG_ON((unsigned long)pte & (PAGE_SIZE-1));
 45	free_page((unsigned long)pte);
 46}
 47
 48static inline void pte_free(struct mm_struct *mm, struct page *pte)
 49{
 50	pgtable_page_dtor(pte);
 51	__free_page(pte);
 52}
 53
 54extern void ___pte_free_tlb(struct mmu_gather *tlb, struct page *pte);
 55
 56static inline void __pte_free_tlb(struct mmu_gather *tlb, struct page *pte,
 57				  unsigned long address)
 58{
 59	___pte_free_tlb(tlb, pte);
 60}
 61
 62static inline void pmd_populate_kernel(struct mm_struct *mm,
 63				       pmd_t *pmd, pte_t *pte)
 64{
 65	paravirt_alloc_pte(mm, __pa(pte) >> PAGE_SHIFT);
 66	set_pmd(pmd, __pmd(__pa(pte) | _PAGE_TABLE));
 67}
 68
 69static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
 70				struct page *pte)
 71{
 72	unsigned long pfn = page_to_pfn(pte);
 73
 74	paravirt_alloc_pte(mm, pfn);
 75	set_pmd(pmd, __pmd(((pteval_t)pfn << PAGE_SHIFT) | _PAGE_TABLE));
 76}
 77
 78#define pmd_pgtable(pmd) pmd_page(pmd)
 79
 80#if PAGETABLE_LEVELS > 2
 81static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
 82{
 83	return (pmd_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
 84}
 85
 86static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
 87{
 88	BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
 89	free_page((unsigned long)pmd);
 90}
 91
 92extern void ___pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd);
 93
 94static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd,
 95				  unsigned long address)
 96{
 97	___pmd_free_tlb(tlb, pmd);
 98}
 99
100#ifdef CONFIG_X86_PAE
101extern void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd);
102#else	/* !CONFIG_X86_PAE */
103static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
104{
105	paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT);
106	set_pud(pud, __pud(_PAGE_TABLE | __pa(pmd)));
107}
108#endif	/* CONFIG_X86_PAE */
109
110#if PAGETABLE_LEVELS > 3
111static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
112{
113	paravirt_alloc_pud(mm, __pa(pud) >> PAGE_SHIFT);
114	set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(pud)));
115}
116
117static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
118{
119	return (pud_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
120}
121
122static inline void pud_free(struct mm_struct *mm, pud_t *pud)
123{
124	BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
125	free_page((unsigned long)pud);
126}
127
128extern void ___pud_free_tlb(struct mmu_gather *tlb, pud_t *pud);
129
130static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud,
131				  unsigned long address)
132{
133	___pud_free_tlb(tlb, pud);
134}
135
136#endif	/* PAGETABLE_LEVELS > 3 */
137#endif	/* PAGETABLE_LEVELS > 2 */
138
139#endif /* _ASM_X86_PGALLOC_H */