/* *  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/gfp.h>#include <linux/mm.h> 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 page *page_table_alloc_pgste(struct mm_struct *mm);void page_table_free(struct mm_struct *, unsigned long *);void page_table_free_rcu(struct mmu_gather *, unsigned long *, unsigned long);void page_table_free_pgste(struct page *page);extern int page_table_allocate_pgste; static inline void clear_table(unsigned long *s, unsigned long val, size_t n){	struct addrtype { char _[256]; };	int i; 	for (i = 0; i < n; i += 256) {		*s = val;		asm volatile(			"mvc	8(248,%[s]),0(%[s])\n"			: "+m" (*(struct addrtype *) s)			: [s] "a" (s));		s += 256 / sizeof(long);	}} static inline void crst_table_init(unsigned long *crst, unsigned long entry){	clear_table(crst, entry, sizeof(unsigned long)*2048);} static inline unsigned long pgd_entry_type(struct mm_struct *mm){	if (mm->context.asce_limit <= (1UL << 31))		return _SEGMENT_ENTRY_EMPTY;	if (mm->context.asce_limit <= (1UL << 42))		return _REGION3_ENTRY_EMPTY;	if (mm->context.asce_limit <= (1UL << 53))		return _REGION2_ENTRY_EMPTY;	return _REGION1_ENTRY_EMPTY;} int crst_table_upgrade(struct mm_struct *mm, unsigned long limit);void crst_table_downgrade(struct mm_struct *); 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;}#define p4d_free(mm, p4d) 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;}#define pud_free(mm, pud) 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 (!pgtable_pmd_page_ctor(virt_to_page(table))) {		crst_table_free(mm, table);		return NULL;	}	return (pmd_t *) table;} static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd){	pgtable_pmd_page_dtor(virt_to_page(pmd));	crst_table_free(mm, (unsigned long *) pmd);} static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d){	pgd_val(*pgd) = _REGION1_ENTRY | __pa(p4d);} static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud){	p4d_val(*p4d) = _REGION2_ENTRY | __pa(pud);} static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd){	pud_val(*pud) = _REGION3_ENTRY | __pa(pmd);} static inline pgd_t *pgd_alloc(struct mm_struct *mm){	unsigned long *table = crst_table_alloc(mm); 	if (!table)		return NULL;	if (mm->context.asce_limit == (1UL << 31)) {		/* Forking a compat process with 2 page table levels */		if (!pgtable_pmd_page_ctor(virt_to_page(table))) {			crst_table_free(mm, table);			return NULL;		}	}	return (pgd_t *) table;} static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd){	if (mm->context.asce_limit == (1UL << 31))		pgtable_pmd_page_dtor(virt_to_page(pgd));	crst_table_free(mm, (unsigned long *) pgd);} static inline void pmd_populate(struct mm_struct *mm,				pmd_t *pmd, pgtable_t pte){	pmd_val(*pmd) = _SEGMENT_ENTRY + __pa(pte);} #define pmd_populate_kernel(mm, pmd, pte) pmd_populate(mm, pmd, pte) #define pmd_pgtable(pmd) \	(pgtable_t)(pmd_val(pmd) & -sizeof(pte_t)*PTRS_PER_PTE) /* * page table entry allocation/free routines. */#define pte_alloc_one_kernel(mm, vmaddr) ((pte_t *) page_table_alloc(mm))#define pte_alloc_one(mm, vmaddr) ((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) extern void rcu_table_freelist_finish(void); #endif /* _S390_PGALLOC_H */