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