/* SPDX-License-Identifier: GPL-2.0-only *//* * Based on arch/arm/include/asm/pgalloc.h * * Copyright (C) 2000-2001 Russell King * Copyright (C) 2012 ARM Ltd. */#ifndef __ASM_PGALLOC_H#define __ASM_PGALLOC_H #include <asm/pgtable-hwdef.h>#include <asm/processor.h>#include <asm/cacheflush.h>#include <asm/tlbflush.h> #define check_pgt_cache()		do { } while (0) #define PGALLOC_GFP	(GFP_KERNEL | __GFP_ZERO)#define PGD_SIZE	(PTRS_PER_PGD * sizeof(pgd_t)) #if CONFIG_PGTABLE_LEVELS > 2 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr){	struct page *page; 	page = alloc_page(PGALLOC_GFP);	if (!page)		return NULL;	if (!pgtable_pmd_page_ctor(page)) {		__free_page(page);		return NULL;	}	return page_address(page);} static inline void pmd_free(struct mm_struct *mm, pmd_t *pmdp){	BUG_ON((unsigned long)pmdp & (PAGE_SIZE-1));	pgtable_pmd_page_dtor(virt_to_page(pmdp));	free_page((unsigned long)pmdp);} static inline void __pud_populate(pud_t *pudp, phys_addr_t pmdp, pudval_t prot){	set_pud(pudp, __pud(__phys_to_pud_val(pmdp) | prot));} static inline void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmdp){	__pud_populate(pudp, __pa(pmdp), PMD_TYPE_TABLE);}#elsestatic inline void __pud_populate(pud_t *pudp, phys_addr_t pmdp, pudval_t prot){	BUILD_BUG();}#endif	/* CONFIG_PGTABLE_LEVELS > 2 */ #if CONFIG_PGTABLE_LEVELS > 3 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr){	return (pud_t *)__get_free_page(PGALLOC_GFP);} static inline void pud_free(struct mm_struct *mm, pud_t *pudp){	BUG_ON((unsigned long)pudp & (PAGE_SIZE-1));	free_page((unsigned long)pudp);} static inline void __pgd_populate(pgd_t *pgdp, phys_addr_t pudp, pgdval_t prot){	set_pgd(pgdp, __pgd(__phys_to_pgd_val(pudp) | prot));} static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgdp, pud_t *pudp){	__pgd_populate(pgdp, __pa(pudp), PUD_TYPE_TABLE);}#elsestatic inline void __pgd_populate(pgd_t *pgdp, phys_addr_t pudp, pgdval_t prot){	BUILD_BUG();}#endif	/* CONFIG_PGTABLE_LEVELS > 3 */ extern pgd_t *pgd_alloc(struct mm_struct *mm);extern void pgd_free(struct mm_struct *mm, pgd_t *pgdp); static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm){	return (pte_t *)__get_free_page(PGALLOC_GFP);} static inline pgtable_tpte_alloc_one(struct mm_struct *mm){	struct page *pte; 	pte = alloc_pages(PGALLOC_GFP, 0);	if (!pte)		return NULL;	if (!pgtable_page_ctor(pte)) {		__free_page(pte);		return NULL;	}	return pte;} /* * Free a PTE table. */static inline void pte_free_kernel(struct mm_struct *mm, pte_t *ptep){	if (ptep)		free_page((unsigned long)ptep);} static inline void pte_free(struct mm_struct *mm, pgtable_t pte){	pgtable_page_dtor(pte);	__free_page(pte);} static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t ptep,				  pmdval_t prot){	set_pmd(pmdp, __pmd(__phys_to_pmd_val(ptep) | prot));} /* * Populate the pmdp entry with a pointer to the pte.  This pmd is part * of the mm address space. */static inline voidpmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep){	/*	 * The pmd must be loaded with the physical address of the PTE table	 */	__pmd_populate(pmdp, __pa(ptep), PMD_TYPE_TABLE);} static inline voidpmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep){	__pmd_populate(pmdp, page_to_phys(ptep), PMD_TYPE_TABLE);}#define pmd_pgtable(pmd) pmd_page(pmd) #endif