/* *  include/asm-s390/pgalloc.h * *  S390 version *    Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation *    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> #define check_pgt_cache()	do {} while (0) unsigned long *crst_table_alloc(struct mm_struct *, int);void crst_table_free(struct mm_struct *, unsigned long *); unsigned long *page_table_alloc(struct mm_struct *);void page_table_free(struct mm_struct *, unsigned long *);void disable_noexec(struct mm_struct *, struct task_struct *); static inline void clear_table(unsigned long *s, unsigned long val, size_t n){	*s = val;	n = (n / 256) - 1;	asm volatile(#ifdef CONFIG_64BIT		"	mvc	8(248,%0),0(%0)\n"#else		"	mvc	4(252,%0),0(%0)\n"#endif		"0:	mvc	256(256,%0),0(%0)\n"		"	la	%0,256(%0)\n"		"	brct	%1,0b\n"		: "+a" (s), "+d" (n));} static inline void crst_table_init(unsigned long *crst, unsigned long entry){	clear_table(crst, entry, sizeof(unsigned long)*2048);	crst = get_shadow_table(crst);	if (crst)		clear_table(crst, entry, sizeof(unsigned long)*2048);} #ifndef __s390x__ static inline unsigned long pgd_entry_type(struct mm_struct *mm){	return _SEGMENT_ENTRY_EMPTY;} #define pud_alloc_one(mm,address)		({ BUG(); ((pud_t *)2); })#define pud_free(mm, x)				do { } while (0) #define pmd_alloc_one(mm,address)		({ BUG(); ((pmd_t *)2); })#define pmd_free(mm, x)				do { } while (0) #define pgd_populate(mm, pgd, pud)		BUG()#define pgd_populate_kernel(mm, pgd, pud)	BUG() #define pud_populate(mm, pud, pmd)		BUG()#define pud_populate_kernel(mm, pud, pmd)	BUG() #else /* __s390x__ */ 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;	return _REGION2_ENTRY_EMPTY;} int crst_table_upgrade(struct mm_struct *, unsigned long limit);void crst_table_downgrade(struct mm_struct *, unsigned long limit); static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address){	unsigned long *table = crst_table_alloc(mm, mm->context.noexec);	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, mm->context.noexec);	if (table)		crst_table_init(table, _SEGMENT_ENTRY_EMPTY);	return (pmd_t *) table;}#define pmd_free(mm, pmd) crst_table_free(mm, (unsigned long *) pmd) static inline void pgd_populate_kernel(struct mm_struct *mm,				       pgd_t *pgd, pud_t *pud){	pgd_val(*pgd) = _REGION2_ENTRY | __pa(pud);} static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud){	pgd_populate_kernel(mm, pgd, pud);	if (mm->context.noexec) {		pgd = get_shadow_table(pgd);		pud = get_shadow_table(pud);		pgd_populate_kernel(mm, pgd, pud);	}} static inline void pud_populate_kernel(struct mm_struct *mm,				       pud_t *pud, pmd_t *pmd){	pud_val(*pud) = _REGION3_ENTRY | __pa(pmd);} static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd){	pud_populate_kernel(mm, pud, pmd);	if (mm->context.noexec) {		pud = get_shadow_table(pud);		pmd = get_shadow_table(pmd);		pud_populate_kernel(mm, pud, pmd);	}} #endif /* __s390x__ */ static inline pgd_t *pgd_alloc(struct mm_struct *mm){	INIT_LIST_HEAD(&mm->context.crst_list);	INIT_LIST_HEAD(&mm->context.pgtable_list);	return (pgd_t *) crst_table_alloc(mm, s390_noexec);}#define pgd_free(mm, pgd) crst_table_free(mm, (unsigned long *) pgd) static inline void pmd_populate_kernel(struct mm_struct *mm,				       pmd_t *pmd, pte_t *pte){	pmd_val(*pmd) = _SEGMENT_ENTRY + __pa(pte);} static inline void pmd_populate(struct mm_struct *mm,				pmd_t *pmd, pgtable_t pte){	pmd_populate_kernel(mm, pmd, pte);	if (mm->context.noexec) {		pmd = get_shadow_table(pmd);		pmd_populate_kernel(mm, pmd, pte + PTRS_PER_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) #endif /* _S390_PGALLOC_H */