/* *  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) extern void diag10(unsigned long addr); /* * Allocate and free page tables. The xxx_kernel() versions are * used to allocate a kernel page table - this turns on ASN bits * if any. */ static inline pgd_t *pgd_alloc(struct mm_struct *mm){	pgd_t *pgd;	int i; #ifndef __s390x__	pgd = (pgd_t *) __get_free_pages(GFP_KERNEL,1);        if (pgd != NULL)		for (i = 0; i < USER_PTRS_PER_PGD; i++)			pmd_clear(pmd_offset(pgd + i, i*PGDIR_SIZE));#else /* __s390x__ */	pgd = (pgd_t *) __get_free_pages(GFP_KERNEL,2);        if (pgd != NULL)		for (i = 0; i < PTRS_PER_PGD; i++)			pgd_clear(pgd + i);#endif /* __s390x__ */	return pgd;} static inline void pgd_free(pgd_t *pgd){#ifndef __s390x__        free_pages((unsigned long) pgd, 1);#else /* __s390x__ */        free_pages((unsigned long) pgd, 2);#endif /* __s390x__ */} #ifndef __s390x__/* * page middle directory allocation/free routines. * We use pmd cache only on s390x, so these are dummy routines. This * code never triggers because the pgd will always be present. */#define pmd_alloc_one(mm,address)       ({ BUG(); ((pmd_t *)2); })#define pmd_free(x)                     do { } while (0)#define __pmd_free_tlb(tlb,x)		do { } while (0)#define pgd_populate(mm, pmd, pte)      BUG()#else /* __s390x__ */static inline pmd_t * pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr){	pmd_t *pmd;        int i; 	pmd = (pmd_t *) __get_free_pages(GFP_KERNEL, 2);	if (pmd != NULL) {		for (i=0; i < PTRS_PER_PMD; i++)			pmd_clear(pmd+i);	}	return pmd;} static inline void pmd_free (pmd_t *pmd){	free_pages((unsigned long) pmd, 2);} #define __pmd_free_tlb(tlb,pmd)			\	do {					\		tlb_flush_mmu(tlb, 0, 0);	\		pmd_free(pmd);			\	 } while (0) static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pmd_t *pmd){	pgd_val(*pgd) = _PGD_ENTRY | __pa(pmd);} #endif /* __s390x__ */ static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte){#ifndef __s390x__	pmd_val(pmd[0]) = _PAGE_TABLE + __pa(pte);	pmd_val(pmd[1]) = _PAGE_TABLE + __pa(pte+256);	pmd_val(pmd[2]) = _PAGE_TABLE + __pa(pte+512);	pmd_val(pmd[3]) = _PAGE_TABLE + __pa(pte+768);#else /* __s390x__ */	pmd_val(*pmd) = _PMD_ENTRY + __pa(pte);	pmd_val1(*pmd) = _PMD_ENTRY + __pa(pte+256);#endif /* __s390x__ */} static inline voidpmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *page){	pmd_populate_kernel(mm, pmd, (pte_t *)((page-mem_map) << PAGE_SHIFT));} /* * page table entry allocation/free routines. */static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long vmaddr){	pte_t *pte;        int i; 	pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT);	if (pte != NULL) {		for (i=0; i < PTRS_PER_PTE; i++) {			pte_clear(mm, vmaddr, pte+i);			vmaddr += PAGE_SIZE;		}	}	return pte;} static inline struct page *pte_alloc_one(struct mm_struct *mm, unsigned long vmaddr){	pte_t *pte = pte_alloc_one_kernel(mm, vmaddr);	if (pte)		return virt_to_page(pte);	return 0;} static inline void pte_free_kernel(pte_t *pte){        free_page((unsigned long) pte);} static inline void pte_free(struct page *pte){        __free_page(pte);} #define __pte_free_tlb(tlb,pte) tlb_remove_page(tlb,pte) #endif /* _S390_PGALLOC_H */