diff options
Diffstat (limited to 'include/asm-ia64/pgalloc.h')
| -rw-r--r-- | include/asm-ia64/pgalloc.h | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/include/asm-ia64/pgalloc.h b/include/asm-ia64/pgalloc.h new file mode 100644 index 000000000000..0f05dc8bd460 --- /dev/null +++ b/include/asm-ia64/pgalloc.h @@ -0,0 +1,167 @@ +#ifndef _ASM_IA64_PGALLOC_H +#define _ASM_IA64_PGALLOC_H + +/* + * This file contains the functions and defines necessary to allocate + * page tables. + * + * This hopefully works with any (fixed) ia-64 page-size, as defined + * in <asm/page.h> (currently 8192). + * + * Copyright (C) 1998-2001 Hewlett-Packard Co + * David Mosberger-Tang <davidm@hpl.hp.com> + * Copyright (C) 2000, Goutham Rao <goutham.rao@intel.com> + */ + +#include <linux/config.h> + +#include <linux/compiler.h> +#include <linux/mm.h> +#include <linux/page-flags.h> +#include <linux/threads.h> + +#include <asm/mmu_context.h> + +/* + * Very stupidly, we used to get new pgd's and pmd's, init their contents + * to point to the NULL versions of the next level page table, later on + * completely re-init them the same way, then free them up. This wasted + * a lot of work and caused unnecessary memory traffic. How broken... + * We fix this by caching them. + */ +#define pgd_quicklist (local_cpu_data->pgd_quick) +#define pmd_quicklist (local_cpu_data->pmd_quick) +#define pgtable_cache_size (local_cpu_data->pgtable_cache_sz) + +static inline pgd_t* +pgd_alloc_one_fast (struct mm_struct *mm) +{ + unsigned long *ret = NULL; + + preempt_disable(); + + ret = pgd_quicklist; + if (likely(ret != NULL)) { + pgd_quicklist = (unsigned long *)(*ret); + ret[0] = 0; + --pgtable_cache_size; + } else + ret = NULL; + + preempt_enable(); + + return (pgd_t *) ret; +} + +static inline pgd_t* +pgd_alloc (struct mm_struct *mm) +{ + /* the VM system never calls pgd_alloc_one_fast(), so we do it here. */ + pgd_t *pgd = pgd_alloc_one_fast(mm); + + if (unlikely(pgd == NULL)) { + pgd = (pgd_t *)__get_free_page(GFP_KERNEL|__GFP_ZERO); + } + return pgd; +} + +static inline void +pgd_free (pgd_t *pgd) +{ + preempt_disable(); + *(unsigned long *)pgd = (unsigned long) pgd_quicklist; + pgd_quicklist = (unsigned long *) pgd; + ++pgtable_cache_size; + preempt_enable(); +} + +static inline void +pud_populate (struct mm_struct *mm, pud_t *pud_entry, pmd_t *pmd) +{ + pud_val(*pud_entry) = __pa(pmd); +} + +static inline pmd_t* +pmd_alloc_one_fast (struct mm_struct *mm, unsigned long addr) +{ + unsigned long *ret = NULL; + + preempt_disable(); + + ret = (unsigned long *)pmd_quicklist; + if (likely(ret != NULL)) { + pmd_quicklist = (unsigned long *)(*ret); + ret[0] = 0; + --pgtable_cache_size; + } + + preempt_enable(); + + return (pmd_t *)ret; +} + +static inline pmd_t* +pmd_alloc_one (struct mm_struct *mm, unsigned long addr) +{ + pmd_t *pmd = (pmd_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO); + + return pmd; +} + +static inline void +pmd_free (pmd_t *pmd) +{ + preempt_disable(); + *(unsigned long *)pmd = (unsigned long) pmd_quicklist; + pmd_quicklist = (unsigned long *) pmd; + ++pgtable_cache_size; + preempt_enable(); +} + +#define __pmd_free_tlb(tlb, pmd) pmd_free(pmd) + +static inline void +pmd_populate (struct mm_struct *mm, pmd_t *pmd_entry, struct page *pte) +{ + pmd_val(*pmd_entry) = page_to_phys(pte); +} + +static inline void +pmd_populate_kernel (struct mm_struct *mm, pmd_t *pmd_entry, pte_t *pte) +{ + pmd_val(*pmd_entry) = __pa(pte); +} + +static inline struct page * +pte_alloc_one (struct mm_struct *mm, unsigned long addr) +{ + struct page *pte = alloc_pages(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO, 0); + + return pte; +} + +static inline pte_t * +pte_alloc_one_kernel (struct mm_struct *mm, unsigned long addr) +{ + pte_t *pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO); + + return pte; +} + +static inline void +pte_free (struct page *pte) +{ + __free_page(pte); +} + +static inline void +pte_free_kernel (pte_t *pte) +{ + free_page((unsigned long) pte); +} + +#define __pte_free_tlb(tlb, pte) tlb_remove_page((tlb), (pte)) + +extern void check_pgt_cache (void); + +#endif /* _ASM_IA64_PGALLOC_H */ |
