/* 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>
#include <
asm/cpufeature.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) {
return 0; }
#ifdef CONFIG_PARAVIRT_XXL
#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_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
/*
* In case of Page Table Isolation active, we acquire two PGDs instead of one.
* 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.
*/
static inline unsigned int pgd_allocation_order(
void)
{
if (cpu_feature_enabled(X86_FEATURE_PTI))
return 1;
return 0;
}
/*
* 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)
{
___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_kernel_safe(
struct mm_struct *mm,
pmd_t *pmd, pte_t *pte)
{
paravirt_alloc_pte(mm, __pa(pte) >> PAGE_SHIFT);
set_pmd_safe(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));
}
#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)
{
___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)));
}
static inline void pud_populate_safe(
struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
{
paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT);
set_pud_safe(pud, __pud(_PAGE_TABLE | __pa(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)
{
paravirt_alloc_pud(mm, __pa(pud) >> PAGE_SHIFT);
set_p4d(p4d, __p4d(_PAGE_TABLE | __pa(pud)));
}
static inline void p4d_populate_safe(
struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
{
paravirt_alloc_pud(mm, __pa(pud) >> PAGE_SHIFT);
set_p4d_safe(p4d, __p4d(_PAGE_TABLE | __pa(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);
}
#if CONFIG_PGTABLE_LEVELS > 4
static inline void pgd_populate(
struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d)
{
if (!pgtable_l5_enabled())
return;
paravirt_alloc_p4d(mm, __pa(p4d) >> PAGE_SHIFT);
set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(p4d)));
}
static inline void pgd_populate_safe(
struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d)
{
if (!pgtable_l5_enabled())
return;
paravirt_alloc_p4d(mm, __pa(p4d) >> PAGE_SHIFT);
set_pgd_safe(pgd, __pgd(_PAGE_TABLE | __pa(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)
{
if (pgtable_l5_enabled())
___p4d_free_tlb(tlb, p4d);
}
#endif /* CONFIG_PGTABLE_LEVELS > 4 */
#endif /* CONFIG_PGTABLE_LEVELS > 3 */
#endif /* CONFIG_PGTABLE_LEVELS > 2 */
#endif /* _ASM_X86_PGALLOC_H */
