/* SPDX-License-Identifier: GPL-2.0-only *//* *  arch/arm/include/asm/pgalloc.h * *  Copyright (C) 2000-2001 Russell King */#ifndef _ASMARM_PGALLOC_H#define _ASMARM_PGALLOC_H #include <linux/pagemap.h> #include <asm/domain.h>#include <asm/pgtable-hwdef.h>#include <asm/processor.h>#include <asm/cacheflush.h>#include <asm/tlbflush.h> #ifdef CONFIG_MMU #define _PAGE_USER_TABLE	(PMD_TYPE_TABLE | PMD_BIT4 | PMD_DOMAIN(DOMAIN_USER))#define _PAGE_KERNEL_TABLE	(PMD_TYPE_TABLE | PMD_BIT4 | PMD_DOMAIN(DOMAIN_KERNEL)) #ifdef CONFIG_ARM_LPAE#define PGD_SIZE		(PTRS_PER_PGD * sizeof(pgd_t)) static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd){	set_pud(pud, __pud(__pa(pmd) | PMD_TYPE_TABLE));} #else	/* !CONFIG_ARM_LPAE */#define PGD_SIZE		(PAGE_SIZE << 2) /* * Since we have only two-level page tables, these are trivial */#define pmd_alloc_one(mm,addr)		({ BUG(); ((pmd_t *)2); })#define pmd_free(mm, pmd)		do { } while (0)#ifdef CONFIG_KASAN/* The KASan core unconditionally calls pud_populate() on all architectures */#define pud_populate(mm,pmd,pte)	do { } while (0)#else#define pud_populate(mm,pmd,pte)	BUG()#endif#endif	/* CONFIG_ARM_LPAE */ extern pgd_t *pgd_alloc(struct mm_struct *mm);extern void pgd_free(struct mm_struct *mm, pgd_t *pgd); static inline void clean_pte_table(pte_t *pte){	clean_dcache_area(pte + PTE_HWTABLE_PTRS, PTE_HWTABLE_SIZE);} /* * Allocate one PTE table. * * This actually allocates two hardware PTE tables, but we wrap this up * into one table thus: * *  +------------+ *  | Linux pt 0 | *  +------------+ *  | Linux pt 1 | *  +------------+ *  |  h/w pt 0  | *  +------------+ *  |  h/w pt 1  | *  +------------+ */ #define __HAVE_ARCH_PTE_ALLOC_ONE_KERNEL#define __HAVE_ARCH_PTE_ALLOC_ONE#define __HAVE_ARCH_PGD_FREE#include <asm-generic/pgalloc.h> static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm){	pte_t *pte = __pte_alloc_one_kernel(mm); 	if (pte)		clean_pte_table(pte); 	return pte;} #ifdef CONFIG_HIGHPTE#define PGTABLE_HIGHMEM __GFP_HIGHMEM#else#define PGTABLE_HIGHMEM 0#endif static inline pgtable_tpte_alloc_one(struct mm_struct *mm){	struct page *pte; 	pte = __pte_alloc_one(mm, GFP_PGTABLE_USER | PGTABLE_HIGHMEM);	if (!pte)		return NULL;	if (!PageHighMem(pte))		clean_pte_table(page_address(pte));	return pte;} static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t pte,				  pmdval_t prot){	pmdval_t pmdval = (pte + PTE_HWTABLE_OFF) | prot;	pmdp[0] = __pmd(pmdval);#ifndef CONFIG_ARM_LPAE	pmdp[1] = __pmd(pmdval + 256 * sizeof(pte_t));#endif	flush_pmd_entry(pmdp);} /* * Populate the pmdp entry with a pointer to the pte.  This pmd is part * of the mm address space. * * Ensure that we always set both PMD entries. */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), _PAGE_KERNEL_TABLE);} static inline voidpmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep){	extern pmdval_t user_pmd_table;	pmdval_t prot; 	if (__LINUX_ARM_ARCH__ >= 6 && !IS_ENABLED(CONFIG_ARM_LPAE))		prot = user_pmd_table;	else		prot = _PAGE_USER_TABLE; 	__pmd_populate(pmdp, page_to_phys(ptep), prot);} #endif /* CONFIG_MMU */ #endif