/* SPDX-License-Identifier: GPL-2.0-only *//* * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) * * vineetg: June 2011 *  -"/proc/meminfo | grep PageTables" kept on increasing *   Recently added pgtable dtor was not getting called. * * vineetg: May 2011 *  -Variable pg-sz means that Page Tables could be variable sized themselves *    So calculate it based on addr traversal split [pgd-bits:pte-bits:xxx] *  -Page Table size capped to max 1 to save memory - hence verified. *  -Since these deal with constants, gcc compile-time optimizes them. * * vineetg: Nov 2010 *  -Added pgtable ctor/dtor used for pgtable mem accounting * * vineetg: April 2010 *  -Switched pgtable_t from being struct page * to unsigned long *      =Needed so that Page Table allocator (pte_alloc_one) is not forced to *       deal with struct page. That way in future we can make it allocate *       multiple PG Tbls in one Page Frame *      =sweet side effect is avoiding calls to ugly page_address( ) from the *       pg-tlb allocator sub-sys (pte_alloc_one, ptr_free, pmd_populate) * *  Amit Bhor, Sameer Dhavale: Codito Technologies 2004 */ #ifndef _ASM_ARC_PGALLOC_H#define _ASM_ARC_PGALLOC_H #include <linux/mm.h>#include <linux/log2.h>#include <asm-generic/pgalloc.h> static inline voidpmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte){	/*	 * The cast to long below is OK in 32-bit PAE40 regime with long long pte	 * Despite "wider" pte, the pte table needs to be in non-PAE low memory	 * as all higher levels can only hold long pointers.	 *	 * The cast itself is needed given simplistic definition of set_pmd()	 */	set_pmd(pmd, __pmd((unsigned long)pte));} static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, pgtable_t pte_page){	set_pmd(pmd, __pmd((unsigned long)page_address(pte_page)));} static inline pgd_t *pgd_alloc(struct mm_struct *mm){	pgd_t *ret = __pgd_alloc(mm, 0); 	if (ret) {		int num, num2; 		num = USER_PTRS_PER_PGD + USER_KERNEL_GUTTER / PGDIR_SIZE;		num2 = VMALLOC_SIZE / PGDIR_SIZE;		memcpy(ret + num, swapper_pg_dir + num, num2 * sizeof(pgd_t));	}	return ret;} #if CONFIG_PGTABLE_LEVELS > 3 static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4dp, pud_t *pudp){	set_p4d(p4dp, __p4d((unsigned long)pudp));} #define __pud_free_tlb(tlb, pmd, addr)  pud_free((tlb)->mm, pmd) #endif #if CONFIG_PGTABLE_LEVELS > 2 static inline void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmdp){	set_pud(pudp, __pud((unsigned long)pmdp));} #define __pmd_free_tlb(tlb, pmd, addr)  pmd_free((tlb)->mm, pmd) #endif #define __pte_free_tlb(tlb, pte, addr)  pte_free((tlb)->mm, pte) #endif /* _ASM_ARC_PGALLOC_H */