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Diffstat (limited to 'include/asm-sh64/pgalloc.h')
| -rw-r--r-- | include/asm-sh64/pgalloc.h | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/include/asm-sh64/pgalloc.h b/include/asm-sh64/pgalloc.h new file mode 100644 index 000000000000..b25f5df5535c --- /dev/null +++ b/include/asm-sh64/pgalloc.h @@ -0,0 +1,195 @@ +#ifndef __ASM_SH64_PGALLOC_H +#define __ASM_SH64_PGALLOC_H + +/* + * 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. + * + * include/asm-sh64/pgalloc.h + * + * Copyright (C) 2000, 2001 Paolo Alberelli + * Copyright (C) 2003, 2004 Paul Mundt + * Copyright (C) 2003, 2004 Richard Curnow + * + */ + +#include <linux/threads.h> +#include <linux/mm.h> + +#define pgd_quicklist (current_cpu_data.pgd_quick) +#define pmd_quicklist (current_cpu_data.pmd_quick) +#define pte_quicklist (current_cpu_data.pte_quick) +#define pgtable_cache_size (current_cpu_data.pgtable_cache_sz) + +static inline void pgd_init(unsigned long page) +{ + unsigned long *pgd = (unsigned long *)page; + extern pte_t empty_bad_pte_table[PTRS_PER_PTE]; + int i; + + for (i = 0; i < USER_PTRS_PER_PGD; i++) + pgd[i] = (unsigned long)empty_bad_pte_table; +} + +/* + * Allocate and free page tables. The xxx_kernel() versions are + * used to allocate a kernel page table - this turns on ASN bits + * if any. + */ + +extern __inline__ pgd_t *get_pgd_slow(void) +{ + unsigned int pgd_size = (USER_PTRS_PER_PGD * sizeof(pgd_t)); + pgd_t *ret = (pgd_t *)kmalloc(pgd_size, GFP_KERNEL); + return ret; +} + +extern __inline__ pgd_t *get_pgd_fast(void) +{ + unsigned long *ret; + + if ((ret = pgd_quicklist) != NULL) { + pgd_quicklist = (unsigned long *)(*ret); + ret[0] = 0; + pgtable_cache_size--; + } else + ret = (unsigned long *)get_pgd_slow(); + + if (ret) { + memset(ret, 0, USER_PTRS_PER_PGD * sizeof(pgd_t)); + } + return (pgd_t *)ret; +} + +extern __inline__ void free_pgd_fast(pgd_t *pgd) +{ + *(unsigned long *)pgd = (unsigned long) pgd_quicklist; + pgd_quicklist = (unsigned long *) pgd; + pgtable_cache_size++; +} + +extern __inline__ void free_pgd_slow(pgd_t *pgd) +{ + kfree((void *)pgd); +} + +extern pte_t *get_pte_slow(pmd_t *pmd, unsigned long address_preadjusted); +extern pte_t *get_pte_kernel_slow(pmd_t *pmd, unsigned long address_preadjusted); + +extern __inline__ pte_t *get_pte_fast(void) +{ + unsigned long *ret; + + if((ret = (unsigned long *)pte_quicklist) != NULL) { + pte_quicklist = (unsigned long *)(*ret); + ret[0] = ret[1]; + pgtable_cache_size--; + } + return (pte_t *)ret; +} + +extern __inline__ void free_pte_fast(pte_t *pte) +{ + *(unsigned long *)pte = (unsigned long) pte_quicklist; + pte_quicklist = (unsigned long *) pte; + pgtable_cache_size++; +} + +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); +} + +static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, + unsigned long address) +{ + pte_t *pte; + + pte = (pte_t *)__get_free_page(GFP_KERNEL | __GFP_REPEAT|__GFP_ZERO); + + return pte; +} + +static inline struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address) +{ + struct page *pte; + + pte = alloc_pages(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO, 0); + + return pte; +} + +#define __pte_free_tlb(tlb,pte) tlb_remove_page((tlb),(pte)) + +/* + * allocating and freeing a pmd is trivial: the 1-entry pmd is + * inside the pgd, so has no extra memory associated with it. + */ + +#if defined(CONFIG_SH64_PGTABLE_2_LEVEL) + +#define pmd_alloc_one(mm, addr) ({ BUG(); ((pmd_t *)2); }) +#define pmd_free(x) do { } while (0) +#define pgd_populate(mm, pmd, pte) BUG() +#define __pte_free_tlb(tlb,pte) tlb_remove_page((tlb),(pte)) +#define __pmd_free_tlb(tlb,pmd) do { } while (0) + +#elif defined(CONFIG_SH64_PGTABLE_3_LEVEL) + +static __inline__ pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address) +{ + pmd_t *pmd; + pmd = (pmd_t *) __get_free_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO); + return pmd; +} + +static __inline__ void pmd_free(pmd_t *pmd) +{ + free_page((unsigned long) pmd); +} + +#define pgd_populate(mm, pgd, pmd) pgd_set(pgd, pmd) +#define __pmd_free_tlb(tlb,pmd) pmd_free(pmd) + +#else +#error "No defined page table size" +#endif + +#define check_pgt_cache() do { } while (0) +#define pgd_free(pgd) free_pgd_slow(pgd) +#define pgd_alloc(mm) get_pgd_fast() + +extern int do_check_pgt_cache(int, int); + +extern inline void set_pgdir(unsigned long address, pgd_t entry) +{ + struct task_struct * p; + pgd_t *pgd; + + read_lock(&tasklist_lock); + for_each_process(p) { + if (!p->mm) + continue; + *pgd_offset(p->mm,address) = entry; + } + read_unlock(&tasklist_lock); + for (pgd = (pgd_t *)pgd_quicklist; pgd; pgd = (pgd_t *)*(unsigned long *)pgd) + pgd[address >> PGDIR_SHIFT] = entry; +} + +#define pmd_populate_kernel(mm, pmd, pte) \ + set_pmd(pmd, __pmd(_PAGE_TABLE + (unsigned long) (pte))) + +static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, + struct page *pte) +{ + set_pmd(pmd, __pmd(_PAGE_TABLE + (unsigned long) page_address (pte))); +} + +#endif /* __ASM_SH64_PGALLOC_H */ |