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Diffstat (limited to 'kernel/arch/microblaze/include/asm/pgalloc.h')
| -rw-r--r-- | kernel/arch/microblaze/include/asm/pgalloc.h | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/kernel/arch/microblaze/include/asm/pgalloc.h b/kernel/arch/microblaze/include/asm/pgalloc.h new file mode 100644 index 000000000..61436d697 --- /dev/null +++ b/kernel/arch/microblaze/include/asm/pgalloc.h @@ -0,0 +1,195 @@ +/* + * 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 | __GFP_REPEAT; +#else + int flags = GFP_KERNEL | __GFP_REPEAT; +#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 */ |