1#ifndef _I386_PGALLOC_H
2#define _I386_PGALLOC_H
3
4#include <linux/threads.h>
5#include <linux/mm.h>		/* for struct page */
6
7#ifdef CONFIG_PARAVIRT
8#include <asm/paravirt.h>
9#else
10#define paravirt_alloc_pt(mm, pfn) do { } while (0)
11#define paravirt_alloc_pd(pfn) do { } while (0)
12#define paravirt_alloc_pd(pfn) do { } while (0)
13#define paravirt_alloc_pd_clone(pfn, clonepfn, start, count) do { } while (0)
14#define paravirt_release_pt(pfn) do { } while (0)
15#define paravirt_release_pd(pfn) do { } while (0)
16#endif
17
18#define pmd_populate_kernel(mm, pmd, pte)			\
19do {								\
20	paravirt_alloc_pt(mm, __pa(pte) >> PAGE_SHIFT);		\
21	set_pmd(pmd, __pmd(_PAGE_TABLE + __pa(pte)));		\
22} while (0)
23
24#define pmd_populate(mm, pmd, pte) 				\
25do {								\
26	paravirt_alloc_pt(mm, page_to_pfn(pte));		\
27	set_pmd(pmd, __pmd(_PAGE_TABLE +			\
28		((unsigned long long)page_to_pfn(pte) <<	\
29			(unsigned long long) PAGE_SHIFT)));	\
30} while (0)
31
32/*
33 * Allocate and free page tables.
34 */
35extern pgd_t *pgd_alloc(struct mm_struct *);
36extern void pgd_free(pgd_t *pgd);
37
38extern pte_t *pte_alloc_one_kernel(struct mm_struct *, unsigned long);
39extern struct page *pte_alloc_one(struct mm_struct *, unsigned long);
40
41static inline void pte_free_kernel(pte_t *pte)
42{
43	free_page((unsigned long)pte);
44}
45
46static inline void pte_free(struct page *pte)
47{
48	__free_page(pte);
49}
50
51
52#define __pte_free_tlb(tlb,pte) 					\
53do {									\
54	paravirt_release_pt(page_to_pfn(pte));				\
55	tlb_remove_page((tlb),(pte));					\
56} while (0)
57
58#ifdef CONFIG_X86_PAE
59/*
60 * In the PAE case we free the pmds as part of the pgd.
61 */
62#define pmd_alloc_one(mm, addr)		({ BUG(); ((pmd_t *)2); })
63#define pmd_free(x)			do { } while (0)
64#define __pmd_free_tlb(tlb,x)		do { } while (0)
65#define pud_populate(mm, pmd, pte)	BUG()
66#endif
67
68#endif /* _I386_PGALLOC_H */
69