/* * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu> * Copyright (C) 2008-2009 PetaLogix * Copyright (C) 2006 Atmark Techno, Inc. * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. */ #ifndef _ASM_MICROBLAZE_PGALLOC_H#define _ASM_MICROBLAZE_PGALLOC_H #ifdef CONFIG_MMU #include <linux/kernel.h>	/* For min/max macros */#include <linux/highmem.h>#include <asm/setup.h>#include <asm/io.h>#include <asm/page.h>#include <asm/cache.h>#include <asm/pgtable.h> #define PGDIR_ORDER	0 /* * This is handled very differently on MicroBlaze since out page tables * are all 0's and I want to be able to use these zero'd pages elsewhere * as well - it gives us quite a speedup. * -- Cort */extern struct pgtable_cache_struct {	unsigned long *pgd_cache;	unsigned long *pte_cache;	unsigned long pgtable_cache_sz;} quicklists; #define pgd_quicklist		(quicklists.pgd_cache)#define pmd_quicklist		((unsigned long *)0)#define pte_quicklist		(quicklists.pte_cache)#define pgtable_cache_size	(quicklists.pgtable_cache_sz) extern unsigned long *zero_cache; /* head linked list of pre-zero'd pages */extern atomic_t zero_sz; /* # currently pre-zero'd pages */extern atomic_t zeropage_hits; /* # zero'd pages request that we've done */extern atomic_t zeropage_calls; /* # zero'd pages request that've been made */extern atomic_t zerototal; /* # pages zero'd over time */ #define zero_quicklist		(zero_cache)#define zero_cache_sz	 	(zero_sz)#define zero_cache_calls	(zeropage_calls)#define zero_cache_hits		(zeropage_hits)#define zero_cache_total	(zerototal) /* * return a pre-zero'd page from the list, * return NULL if none available -- Cort */extern unsigned long get_zero_page_fast(void); extern void __bad_pte(pmd_t *pmd); static inline pgd_t *get_pgd_slow(void){	pgd_t *ret; 	ret = (pgd_t *)__get_free_pages(GFP_KERNEL, PGDIR_ORDER);	if (ret != NULL)		clear_page(ret);	return ret;} static inline pgd_t *get_pgd_fast(void){	unsigned long *ret; 	ret = pgd_quicklist;	if (ret != NULL) {		pgd_quicklist = (unsigned long *)(*ret);		ret[0] = 0;		pgtable_cache_size--;	} else		ret = (unsigned long *)get_pgd_slow();	return (pgd_t *)ret;} static inline void free_pgd_fast(pgd_t *pgd){	*(unsigned long **)pgd = pgd_quicklist;	pgd_quicklist = (unsigned long *) pgd;	pgtable_cache_size++;} static inline void free_pgd_slow(pgd_t *pgd){	free_page((unsigned long)pgd);} #define pgd_free(mm, pgd)        free_pgd_fast(pgd)#define pgd_alloc(mm)		get_pgd_fast() #define pmd_pgtable(pmd)	pmd_page(pmd) /* * We don't have any real pmd's, and this code never triggers because * the pgd will always be present.. */#define pmd_alloc_one_fast(mm, address)	({ BUG(); ((pmd_t *)1); })#define pmd_alloc_one(mm, address)	({ BUG(); ((pmd_t *)2); }) extern pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr); static inline struct page *pte_alloc_one(struct mm_struct *mm,		unsigned long address){	struct page *ptepage; #ifdef CONFIG_HIGHPTE	int flags = GFP_KERNEL | __GFP_HIGHMEM;#else	int flags = GFP_KERNEL;#endif 	ptepage = alloc_pages(flags, 0);	if (!ptepage)		return NULL;	clear_highpage(ptepage);	if (!pgtable_page_ctor(ptepage)) {		__free_page(ptepage);		return NULL;	}	return ptepage;} static inline pte_t *pte_alloc_one_fast(struct mm_struct *mm,		unsigned long address){	unsigned long *ret; 	ret = pte_quicklist;	if (ret != NULL) {		pte_quicklist = (unsigned long *)(*ret);		ret[0] = 0;		pgtable_cache_size--;	}	return (pte_t *)ret;} static inline void pte_free_fast(pte_t *pte){	*(unsigned long **)pte = pte_quicklist;	pte_quicklist = (unsigned long *) pte;	pgtable_cache_size++;} static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte){	free_page((unsigned long)pte);} static inline void pte_free_slow(struct page *ptepage){	__free_page(ptepage);} static inline void pte_free(struct mm_struct *mm, struct page *ptepage){	pgtable_page_dtor(ptepage);	__free_page(ptepage);} #define __pte_free_tlb(tlb, pte, addr)	pte_free((tlb)->mm, (pte)) #define pmd_populate(mm, pmd, pte) \			(pmd_val(*(pmd)) = (unsigned long)page_address(pte)) #define pmd_populate_kernel(mm, pmd, pte) \		(pmd_val(*(pmd)) = (unsigned long) (pte)) /* * We don't have any real pmd's, and this code never triggers because * the pgd will always be present.. */#define pmd_alloc_one(mm, address)	({ BUG(); ((pmd_t *)2); })#define pmd_free(mm, x)			do { } while (0)#define __pmd_free_tlb(tlb, x, addr)	pmd_free((tlb)->mm, x)#define pgd_populate(mm, pmd, pte)	BUG() extern int do_check_pgt_cache(int, int); #endif /* CONFIG_MMU */ #define check_pgt_cache()		do { } while (0) #endif /* _ASM_MICROBLAZE_PGALLOC_H */