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