[linux-2.6-block.git] / arch / x86 / include / asm / pgalloc.h

#ifndef _ASM_X86_PGALLOC_H
#define _ASM_X86_PGALLOC_H

#include <linux/threads.h>
#include <linux/mm.h>		/* for struct page */
#include <linux/pagemap.h>

static inline int  __paravirt_pgd_alloc(struct mm_struct *mm) { return 0; }

#ifdef CONFIG_PARAVIRT
#include <asm/paravirt.h>
#else
#define paravirt_pgd_alloc(mm)	__paravirt_pgd_alloc(mm)
static inline void paravirt_pgd_free(struct mm_struct *mm, pgd_t *pgd) {}
static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn)	{}
static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn)	{}
static inline void paravirt_alloc_pmd_clone(unsigned long pfn, unsigned long clonepfn,
					    unsigned long start, unsigned long count) {}
static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn)	{}
static inline void paravirt_release_pte(unsigned long pfn) {}
static inline void paravirt_release_pmd(unsigned long pfn) {}
static inline void paravirt_release_pud(unsigned long pfn) {}
#endif

/*
 * Flags to use when allocating a user page table page.
 */
extern gfp_t __userpte_alloc_gfp;

/*
 * Allocate and free page tables.
 */
extern pgd_t *pgd_alloc(struct mm_struct *);
extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);

extern pte_t *pte_alloc_one_kernel(struct mm_struct *, unsigned long);
extern pgtable_t pte_alloc_one(struct mm_struct *, unsigned long);

/* Should really implement gc for free page table pages. This could be
   done with a reference count in struct page. */

static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
{
	BUG_ON((unsigned long)pte & (PAGE_SIZE-1));
	free_page((unsigned long)pte);
}

static inline void pte_free(struct mm_struct *mm, struct page *pte)
{
	pgtable_page_dtor(pte);
	__free_page(pte);
}

extern void ___pte_free_tlb(struct mmu_gather *tlb, struct page *pte);

static inline void __pte_free_tlb(struct mmu_gather *tlb, struct page *pte,
				  unsigned long address)
{
	___pte_free_tlb(tlb, pte);
}

static inline void pmd_populate_kernel(struct mm_struct *mm,
				       pmd_t *pmd, pte_t *pte)
{
	paravirt_alloc_pte(mm, __pa(pte) >> PAGE_SHIFT);
	set_pmd(pmd, __pmd(__pa(pte) | _PAGE_TABLE));
}

static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
				struct page *pte)
{
	unsigned long pfn = page_to_pfn(pte);

	paravirt_alloc_pte(mm, pfn);
	set_pmd(pmd, __pmd(((pteval_t)pfn << PAGE_SHIFT) | _PAGE_TABLE));
}

#define pmd_pgtable(pmd) pmd_page(pmd)

#if CONFIG_PGTABLE_LEVELS > 2
static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
{
	struct page *page;
	gfp_t gfp = GFP_KERNEL_ACCOUNT | __GFP_ZERO;

	if (mm == &init_mm)
		gfp &= ~__GFP_ACCOUNT;
	page = alloc_pages(gfp, 0);
	if (!page)
		return NULL;
	if (!pgtable_pmd_page_ctor(page)) {
		__free_pages(page, 0);
		return NULL;
	}
	return (pmd_t *)page_address(page);
}

static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
{
	BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
	pgtable_pmd_page_dtor(virt_to_page(pmd));
	free_page((unsigned long)pmd);
}

extern void ___pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd);

static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd,
				  unsigned long address)
{
	___pmd_free_tlb(tlb, pmd);
}

#ifdef CONFIG_X86_PAE
extern void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd);
#else	/* !CONFIG_X86_PAE */
static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
{
	paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT);
	set_pud(pud, __pud(_PAGE_TABLE | __pa(pmd)));
}
#endif	/* CONFIG_X86_PAE */

#if CONFIG_PGTABLE_LEVELS > 3
static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
{
	paravirt_alloc_pud(mm, __pa(pud) >> PAGE_SHIFT);
	set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(pud)));
}

static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
{
	gfp_t gfp = GFP_KERNEL_ACCOUNT;

	if (mm == &init_mm)
		gfp &= ~__GFP_ACCOUNT;
	return (pud_t *)get_zeroed_page(gfp);
}

static inline void pud_free(struct mm_struct *mm, pud_t *pud)
{
	BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
	free_page((unsigned long)pud);
}

extern void ___pud_free_tlb(struct mmu_gather *tlb, pud_t *pud);

static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud,
				  unsigned long address)
{
	___pud_free_tlb(tlb, pud);
}

#endif	/* CONFIG_PGTABLE_LEVELS > 3 */
#endif	/* CONFIG_PGTABLE_LEVELS > 2 */

#endif /* _ASM_X86_PGALLOC_H */
Commit	Line	Data
1965aae3 PA	1	#ifndef _ASM_X86_PGALLOC_H
1965aae3 PA	2	#define _ASM_X86_PGALLOC_H
4f76cd38 JF	3
	4	#include <linux/threads.h>
	5	#include <linux/mm.h> /* for struct page */
	6	#include <linux/pagemap.h>
	7
eba0045f JF	8	static inline int __paravirt_pgd_alloc(struct mm_struct *mm) { return 0; }
eba0045f JF	9
1d262d3a JF	10	#ifdef CONFIG_PARAVIRT
	11	#include <asm/paravirt.h>
	12	#else
eba0045f JF	13	#define paravirt_pgd_alloc(mm) __paravirt_pgd_alloc(mm)
eba0045f JF	14	static inline void paravirt_pgd_free(struct mm_struct mm, pgd_t pgd) {}
286cd494 JF	15	static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn) {}
	16	static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn) {}
	17	static inline void paravirt_alloc_pmd_clone(unsigned long pfn, unsigned long clonepfn,
	18	unsigned long start, unsigned long count) {}
	19	static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn) {}
	20	static inline void paravirt_release_pte(unsigned long pfn) {}
	21	static inline void paravirt_release_pmd(unsigned long pfn) {}
	22	static inline void paravirt_release_pud(unsigned long pfn) {}
1d262d3a JF	23	#endif
1d262d3a JF	24
14315592 IC	25	/*
	26	* Flags to use when allocating a user page table page.
	27	*/
	28	extern gfp_t __userpte_alloc_gfp;
	29
4f76cd38 JF	30	/*
	31	* Allocate and free page tables.
	32	*/
	33	extern pgd_t pgd_alloc(struct mm_struct );
	34	extern void pgd_free(struct mm_struct mm, pgd_t pgd);
	35
	36	extern pte_t pte_alloc_one_kernel(struct mm_struct , unsigned long);
	37	extern pgtable_t pte_alloc_one(struct mm_struct *, unsigned long);
	38
397f687a JF	39	/* Should really implement gc for free page table pages. This could be
	40	done with a reference count in struct page. */
	41
	42	static 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
	48	static inline void pte_free(struct mm_struct mm, struct page pte)
	49	{
42ef73fe	50	pgtable_page_dtor(pte);
397f687a JF	51	__free_page(pte);
	52	}
	53
9e1b32ca BH	54	extern void ___pte_free_tlb(struct mmu_gather tlb, struct page pte);
	55
	56	static inline void __pte_free_tlb(struct mmu_gather tlb, struct page pte,
	57	unsigned long address)
	58	{
	59	___pte_free_tlb(tlb, pte);
	60	}
397f687a	61
170fdff7 JF	62	static inline void pmd_populate_kernel(struct mm_struct *mm,
	63	pmd_t pmd, pte_t pte)
	64	{
6944a9c8	65	paravirt_alloc_pte(mm, __pa(pte) >> PAGE_SHIFT);
170fdff7 JF	66	set_pmd(pmd, __pmd(__pa(pte) \| _PAGE_TABLE));
	67	}
	68
	69	static 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
6944a9c8	74	paravirt_alloc_pte(mm, pfn);
170fdff7 JF	75	set_pmd(pmd, __pmd(((pteval_t)pfn << PAGE_SHIFT) \| _PAGE_TABLE));
	76	}
	77
	78	#define pmd_pgtable(pmd) pmd_page(pmd)
	79
98233368	80	#if CONFIG_PGTABLE_LEVELS > 2
170fdff7 JF	81	static inline pmd_t pmd_alloc_one(struct mm_struct mm, unsigned long addr)
170fdff7 JF	82	{
9491846f	83	struct page *page;
3e79ec7d VD	84	gfp_t gfp = GFP_KERNEL_ACCOUNT \| __GFP_ZERO;
	85
	86	if (mm == &init_mm)
	87	gfp &= ~__GFP_ACCOUNT;
	88	page = alloc_pages(gfp, 0);
9491846f KS	89	if (!page)
	90	return NULL;
	91	if (!pgtable_pmd_page_ctor(page)) {
	92	__free_pages(page, 0);
	93	return NULL;
	94	}
	95	return (pmd_t *)page_address(page);
170fdff7 JF	96	}
	97
	98	static inline void pmd_free(struct mm_struct mm, pmd_t pmd)
	99	{
	100	BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
9491846f	101	pgtable_pmd_page_dtor(virt_to_page(pmd));
170fdff7 JF	102	free_page((unsigned long)pmd);
	103	}
	104
9e1b32ca BH	105	extern void ___pmd_free_tlb(struct mmu_gather tlb, pmd_t pmd);
	106
	107	static inline void __pmd_free_tlb(struct mmu_gather tlb, pmd_t pmd,
b595076a	108	unsigned long address)
9e1b32ca BH	109	{
	110	___pmd_free_tlb(tlb, pmd);
	111	}
170fdff7	112
5a5f8f42 JF	113	#ifdef CONFIG_X86_PAE
	114	extern void pud_populate(struct mm_struct mm, pud_t pudp, pmd_t *pmd);
	115	#else /* !CONFIG_X86_PAE */
	116	static inline void pud_populate(struct mm_struct mm, pud_t pud, pmd_t *pmd)
	117	{
6944a9c8	118	paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT);
5a5f8f42 JF	119	set_pud(pud, __pud(_PAGE_TABLE \| __pa(pmd)));
	120	}
	121	#endif /* CONFIG_X86_PAE */
	122
98233368	123	#if CONFIG_PGTABLE_LEVELS > 3
5a5f8f42 JF	124	static inline void pgd_populate(struct mm_struct mm, pgd_t pgd, pud_t *pud)
5a5f8f42 JF	125	{
2761fa09	126	paravirt_alloc_pud(mm, __pa(pud) >> PAGE_SHIFT);
5a5f8f42 JF	127	set_pgd(pgd, __pgd(_PAGE_TABLE \| __pa(pud)));
	128	}
	129
	130	static inline pud_t pud_alloc_one(struct mm_struct mm, unsigned long addr)
	131	{
3e79ec7d VD	132	gfp_t gfp = GFP_KERNEL_ACCOUNT;
	133
	134	if (mm == &init_mm)
	135	gfp &= ~__GFP_ACCOUNT;
	136	return (pud_t *)get_zeroed_page(gfp);
5a5f8f42 JF	137	}
	138
	139	static inline void pud_free(struct mm_struct mm, pud_t pud)
	140	{
	141	BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
	142	free_page((unsigned long)pud);
	143	}
	144
9e1b32ca BH	145	extern void ___pud_free_tlb(struct mmu_gather tlb, pud_t pud);
	146
	147	static inline void __pud_free_tlb(struct mmu_gather tlb, pud_t pud,
	148	unsigned long address)
	149	{
	150	___pud_free_tlb(tlb, pud);
	151	}
	152
98233368 KS	153	#endif /* CONFIG_PGTABLE_LEVELS > 3 */
98233368 KS	154	#endif /* CONFIG_PGTABLE_LEVELS > 2 */
4f76cd38	155
1965aae3	156	#endif /* _ASM_X86_PGALLOC_H */