1 #ifndef _ASM_IA64_PGALLOC_H
2 #define _ASM_IA64_PGALLOC_H
5 * This file contains the functions and defines necessary to allocate
8 * This hopefully works with any (fixed) ia-64 page-size, as defined
9 * in <asm/page.h> (currently 8192).
11 * Copyright (C) 1998-2001 Hewlett-Packard Co
12 * David Mosberger-Tang <davidm@hpl.hp.com>
13 * Copyright (C) 2000, Goutham Rao <goutham.rao@intel.com>
16 #include <linux/config.h>
18 #include <linux/compiler.h>
20 #include <linux/page-flags.h>
21 #include <linux/threads.h>
23 #include <asm/mmu_context.h>
24 #include <asm/processor.h>
26 #define arch_add_exec_range(mm, limit) do { ; } while (0)
27 #define arch_flush_exec_range(mm) do { ; } while (0)
28 #define arch_remove_exec_range(mm, limit) do { ; } while (0)
31 * Very stupidly, we used to get new pgd's and pmd's, init their contents
32 * to point to the NULL versions of the next level page table, later on
33 * completely re-init them the same way, then free them up. This wasted
34 * a lot of work and caused unnecessary memory traffic. How broken...
35 * We fix this by caching them.
37 #define pgd_quicklist (local_cpu_data->pgd_quick)
38 #define pmd_quicklist (local_cpu_data->pmd_quick)
39 #define pgtable_cache_size (local_cpu_data->pgtable_cache_sz)
42 pgd_alloc_one_fast (struct mm_struct *mm)
44 unsigned long *ret = pgd_quicklist;
46 if (likely(ret != NULL)) {
47 pgd_quicklist = (unsigned long *)(*ret);
56 pgd_alloc (struct mm_struct *mm)
58 /* the VM system never calls pgd_alloc_one_fast(), so we do it here. */
59 pgd_t *pgd = pgd_alloc_one_fast(mm);
61 if (unlikely(pgd == NULL)) {
62 pgd = (pgd_t *)__get_free_page(GFP_KERNEL);
63 if (likely(pgd != NULL))
72 *(unsigned long *)pgd = (unsigned long) pgd_quicklist;
73 pgd_quicklist = (unsigned long *) pgd;
78 pgd_populate (struct mm_struct *mm, pgd_t *pgd_entry, pmd_t *pmd)
80 pgd_val(*pgd_entry) = __pa(pmd);
85 pmd_alloc_one_fast (struct mm_struct *mm, unsigned long addr)
87 unsigned long *ret = (unsigned long *)pmd_quicklist;
89 if (likely(ret != NULL)) {
90 pmd_quicklist = (unsigned long *)(*ret);
98 pmd_alloc_one (struct mm_struct *mm, unsigned long addr)
100 pmd_t *pmd = (pmd_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT);
102 if (likely(pmd != NULL))
108 pmd_free (pmd_t *pmd)
110 *(unsigned long *)pmd = (unsigned long) pmd_quicklist;
111 pmd_quicklist = (unsigned long *) pmd;
112 ++pgtable_cache_size;
115 #define __pmd_free_tlb(tlb, pmd) pmd_free(pmd)
118 pmd_populate (struct mm_struct *mm, pmd_t *pmd_entry, struct page *pte)
120 pmd_val(*pmd_entry) = page_to_phys(pte);
124 pmd_populate_kernel (struct mm_struct *mm, pmd_t *pmd_entry, pte_t *pte)
126 pmd_val(*pmd_entry) = __pa(pte);
129 static inline struct page *
130 pte_alloc_one (struct mm_struct *mm, unsigned long addr)
132 struct page *pte = alloc_pages(GFP_KERNEL|__GFP_REPEAT, 0);
134 if (likely(pte != NULL))
135 clear_page(page_address(pte));
139 static inline pte_t *
140 pte_alloc_one_kernel (struct mm_struct *mm, unsigned long addr)
142 pte_t *pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT);
144 if (likely(pte != NULL))
150 pte_free (struct page *pte)
156 pte_free_kernel (pte_t *pte)
158 free_page((unsigned long) pte);
161 #define __pte_free_tlb(tlb, pte) tlb_remove_page((tlb), (pte))
163 extern void check_pgt_cache (void);
165 #endif /* _ASM_IA64_PGALLOC_H */