ia64/xen-unstable

view linux-2.6-xen-sparse/include/asm-ia64/pgalloc.h @ 9762:a3cc276f2e87

[IA64] dma paravirtualization

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
author awilliam@localhost
date Tue Apr 25 16:53:27 2006 -0600 (2006-04-25)
parents e311941eb7be
children 29ef650eb22a
line source
1 #ifndef _ASM_IA64_PGALLOC_H
2 #define _ASM_IA64_PGALLOC_H
4 /*
5 * This file contains the functions and defines necessary to allocate
6 * page tables.
7 *
8 * This hopefully works with any (fixed) ia-64 page-size, as defined
9 * in <asm/page.h> (currently 8192).
10 *
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>
14 */
16 #include <linux/config.h>
18 #include <linux/compiler.h>
19 #include <linux/mm.h>
20 #include <linux/page-flags.h>
21 #include <linux/threads.h>
23 #include <asm/mmu_context.h>
25 DECLARE_PER_CPU(unsigned long *, __pgtable_quicklist);
26 #define pgtable_quicklist __ia64_per_cpu_var(__pgtable_quicklist)
27 DECLARE_PER_CPU(long, __pgtable_quicklist_size);
28 #define pgtable_quicklist_size __ia64_per_cpu_var(__pgtable_quicklist_size)
30 static inline long pgtable_quicklist_total_size(void)
31 {
32 long ql_size = 0;
33 int cpuid;
35 for_each_online_cpu(cpuid) {
36 ql_size += per_cpu(__pgtable_quicklist_size, cpuid);
37 }
38 return ql_size;
39 }
41 static inline void *pgtable_quicklist_alloc(void)
42 {
43 unsigned long *ret = NULL;
45 preempt_disable();
47 ret = pgtable_quicklist;
48 if (likely(ret != NULL)) {
49 pgtable_quicklist = (unsigned long *)(*ret);
50 ret[0] = 0;
51 --pgtable_quicklist_size;
52 preempt_enable();
53 } else {
54 preempt_enable();
55 ret = (unsigned long *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
56 }
58 return ret;
59 }
61 static inline void pgtable_quicklist_free(void *pgtable_entry)
62 {
63 #ifdef CONFIG_NUMA
64 unsigned long nid = page_to_nid(virt_to_page(pgtable_entry));
66 if (unlikely(nid != numa_node_id())) {
67 free_page((unsigned long)pgtable_entry);
68 return;
69 }
70 #endif
72 preempt_disable();
73 *(unsigned long *)pgtable_entry = (unsigned long)pgtable_quicklist;
74 pgtable_quicklist = (unsigned long *)pgtable_entry;
75 ++pgtable_quicklist_size;
76 preempt_enable();
77 }
79 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
80 {
81 return pgtable_quicklist_alloc();
82 }
84 static inline void pgd_free(pgd_t * pgd)
85 {
86 pgtable_quicklist_free(pgd);
87 }
89 #ifdef CONFIG_PGTABLE_4
90 static inline void
91 pgd_populate(struct mm_struct *mm, pgd_t * pgd_entry, pud_t * pud)
92 {
93 pgd_val(*pgd_entry) = __pa(pud);
94 }
96 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
97 {
98 return pgtable_quicklist_alloc();
99 }
101 static inline void pud_free(pud_t * pud)
102 {
103 pgtable_quicklist_free(pud);
104 }
105 #define __pud_free_tlb(tlb, pud) pud_free(pud)
106 #endif /* CONFIG_PGTABLE_4 */
108 static inline void
109 pud_populate(struct mm_struct *mm, pud_t * pud_entry, pmd_t * pmd)
110 {
111 pud_val(*pud_entry) = __pa(pmd);
112 }
114 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
115 {
116 return pgtable_quicklist_alloc();
117 }
119 static inline void pmd_free(pmd_t * pmd)
120 {
121 pgtable_quicklist_free(pmd);
122 }
124 #define __pmd_free_tlb(tlb, pmd) pmd_free(pmd)
126 static inline void
127 pmd_populate(struct mm_struct *mm, pmd_t * pmd_entry, struct page *pte)
128 {
129 pmd_val(*pmd_entry) = page_to_pseudophys(pte);
130 }
132 static inline void
133 pmd_populate_kernel(struct mm_struct *mm, pmd_t * pmd_entry, pte_t * pte)
134 {
135 pmd_val(*pmd_entry) = __pa(pte);
136 }
138 static inline struct page *pte_alloc_one(struct mm_struct *mm,
139 unsigned long addr)
140 {
141 return virt_to_page(pgtable_quicklist_alloc());
142 }
144 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
145 unsigned long addr)
146 {
147 return pgtable_quicklist_alloc();
148 }
150 static inline void pte_free(struct page *pte)
151 {
152 pgtable_quicklist_free(page_address(pte));
153 }
155 static inline void pte_free_kernel(pte_t * pte)
156 {
157 pgtable_quicklist_free(pte);
158 }
160 #define __pte_free_tlb(tlb, pte) pte_free(pte)
162 extern void check_pgt_cache(void);
164 #endif /* _ASM_IA64_PGALLOC_H */