/* SPDX-License-Identifier: GPL-2.0 *//* *  S390 version *    Copyright IBM Corp. 1999, 2000 *    Author(s): Hartmut Penner (hp@de.ibm.com) *               Martin Schwidefsky (schwidefsky@de.ibm.com) * *  Derived from "include/asm-i386/pgalloc.h" *    Copyright (C) 1994  Linus Torvalds */ #ifndef _S390_PGALLOC_H#define _S390_PGALLOC_H #include <linux/threads.h>#include <linux/string.h>#include <linux/gfp.h>#include <linux/mm.h> #define CRST_ALLOC_ORDER 2 unsigned long *crst_table_alloc(struct mm_struct *);void crst_table_free(struct mm_struct *, unsigned long *); unsigned long *page_table_alloc(struct mm_struct *);struct ptdesc *page_table_alloc_pgste(struct mm_struct *mm);void page_table_free(struct mm_struct *, unsigned long *);void page_table_free_pgste(struct ptdesc *ptdesc);extern int page_table_allocate_pgste; static inline void crst_table_init(unsigned long *crst, unsigned long entry){	memset64((u64 *)crst, entry, _CRST_ENTRIES);} int crst_table_upgrade(struct mm_struct *mm, unsigned long limit); static inline unsigned long check_asce_limit(struct mm_struct *mm, unsigned long addr,					     unsigned long len){	int rc; 	if (addr + len > mm->context.asce_limit &&	    addr + len <= TASK_SIZE) {		rc = crst_table_upgrade(mm, addr + len);		if (rc)			return (unsigned long) rc;	}	return addr;} static inline p4d_t *p4d_alloc_one(struct mm_struct *mm, unsigned long address){	unsigned long *table = crst_table_alloc(mm); 	if (table)		crst_table_init(table, _REGION2_ENTRY_EMPTY);	return (p4d_t *) table;} static inline void p4d_free(struct mm_struct *mm, p4d_t *p4d){	if (!mm_p4d_folded(mm))		crst_table_free(mm, (unsigned long *) p4d);} static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address){	unsigned long *table = crst_table_alloc(mm);	if (table)		crst_table_init(table, _REGION3_ENTRY_EMPTY);	return (pud_t *) table;} static inline void pud_free(struct mm_struct *mm, pud_t *pud){	if (!mm_pud_folded(mm))		crst_table_free(mm, (unsigned long *) pud);} static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr){	unsigned long *table = crst_table_alloc(mm); 	if (!table)		return NULL;	crst_table_init(table, _SEGMENT_ENTRY_EMPTY);	if (!pagetable_pmd_ctor(virt_to_ptdesc(table))) {		crst_table_free(mm, table);		return NULL;	}	return (pmd_t *) table;} static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd){	if (mm_pmd_folded(mm))		return;	pagetable_pmd_dtor(virt_to_ptdesc(pmd));	crst_table_free(mm, (unsigned long *) pmd);} static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d){	set_pgd(pgd, __pgd(_REGION1_ENTRY | __pa(p4d)));} static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud){	set_p4d(p4d, __p4d(_REGION2_ENTRY | __pa(pud)));} static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd){	set_pud(pud, __pud(_REGION3_ENTRY | __pa(pmd)));} static inline pgd_t *pgd_alloc(struct mm_struct *mm){	return (pgd_t *) crst_table_alloc(mm);} static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd){	crst_table_free(mm, (unsigned long *) pgd);} static inline void pmd_populate(struct mm_struct *mm,				pmd_t *pmd, pgtable_t pte){	set_pmd(pmd, __pmd(_SEGMENT_ENTRY | __pa(pte)));} #define pmd_populate_kernel(mm, pmd, pte) pmd_populate(mm, pmd, pte) /* * page table entry allocation/free routines. */#define pte_alloc_one_kernel(mm) ((pte_t *)page_table_alloc(mm))#define pte_alloc_one(mm) ((pte_t *)page_table_alloc(mm)) #define pte_free_kernel(mm, pte) page_table_free(mm, (unsigned long *) pte)#define pte_free(mm, pte) page_table_free(mm, (unsigned long *) pte) /* arch use pte_free_defer() implementation in arch/s390/mm/pgalloc.c */#define pte_free_defer pte_free_defervoid pte_free_defer(struct mm_struct *mm, pgtable_t pgtable); void vmem_map_init(void);void *vmem_crst_alloc(unsigned long val);pte_t *vmem_pte_alloc(void); unsigned long base_asce_alloc(unsigned long addr, unsigned long num_pages);void base_asce_free(unsigned long asce); #endif /* _S390_PGALLOC_H */