linux/arch/x86/include/asm/pgalloc.h

/* SPDX-License-Identifier: GPL-2.0 */
#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>

#define __HAVE_ARCH_PTE_ALLOC_ONE
#define __HAVE_ARCH_PGD_FREE
#include <asm-generic/pgalloc.h>

static inline int  __paravirt_pgd_alloc(struct mm_struct *mm) { … }

#ifdef CONFIG_PARAVIRT_XXL
#include <asm/paravirt.h>
#else
#define paravirt_pgd_alloc …
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_alloc_p4d(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) {}
static inline void paravirt_release_p4d(unsigned long pfn) {}
#endif

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

#ifdef CONFIG_MITIGATION_PAGE_TABLE_ISOLATION
/*
 * Instead of one PGD, we acquire two PGDs.  Being order-1, it is
 * both 8k in size and 8k-aligned.  That lets us just flip bit 12
 * in a pointer to swap between the two 4k halves.
 */
#define PGD_ALLOCATION_ORDER …
#else
#define PGD_ALLOCATION_ORDER …
#endif

/*
 * 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 pgtable_t pte_alloc_one(struct mm_struct *);

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)
{ … }

static inline void pmd_populate_kernel(struct mm_struct *mm,
				       pmd_t *pmd, pte_t *pte)
{ … }

static inline void pmd_populate_kernel_safe(struct mm_struct *mm,
				       pmd_t *pmd, pte_t *pte)
{ … }

static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
				struct page *pte)
{ … }

#if CONFIG_PGTABLE_LEVELS > 2
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)
{ … }

#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)
{ … }

static inline void pud_populate_safe(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
{ … }
#endif	/* CONFIG_X86_PAE */

#if CONFIG_PGTABLE_LEVELS > 3
static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
{ … }

static inline void p4d_populate_safe(struct mm_struct *mm, p4d_t *p4d, pud_t *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)
{ … }

#if CONFIG_PGTABLE_LEVELS > 4
static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d)
{ … }

static inline void pgd_populate_safe(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d)
{ … }

static inline p4d_t *p4d_alloc_one(struct mm_struct *mm, unsigned long addr)
{ … }

static inline void p4d_free(struct mm_struct *mm, p4d_t *p4d)
{ … }

extern void ___p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d);

static inline void __p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d,
				  unsigned long address)
{ … }

#endif	/* CONFIG_PGTABLE_LEVELS > 4 */
#endif	/* CONFIG_PGTABLE_LEVELS > 3 */
#endif	/* CONFIG_PGTABLE_LEVELS > 2 */

#endif /* _ASM_X86_PGALLOC_H */