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>
26 * Very stupidly, we used to get new pgd's and pmd's, init their contents
27 * to point to the NULL versions of the next level page table, later on
28 * completely re-init them the same way, then free them up. This wasted
29 * a lot of work and caused unnecessary memory traffic. How broken...
30 * We fix this by caching them.
32 #define pgd_quicklist (local_cpu_data->pgd_quick)
33 #define pmd_quicklist (local_cpu_data->pmd_quick)
34 #define pgtable_cache_size (local_cpu_data->pgtable_cache_sz)
37 pgd_alloc_one_fast (struct mm_struct
*mm
)
39 unsigned long *ret
= NULL
;
44 if (likely(ret
!= NULL
)) {
45 pgd_quicklist
= (unsigned long *)(*ret
);
57 pgd_alloc (struct mm_struct
*mm
)
59 /* the VM system never calls pgd_alloc_one_fast(), so we do it here. */
60 pgd_t
*pgd
= pgd_alloc_one_fast(mm
);
62 if (unlikely(pgd
== NULL
)) {
63 pgd
= (pgd_t
*)__get_free_page(GFP_KERNEL
|__GFP_ZERO
);
72 *(unsigned long *)pgd
= (unsigned long) pgd_quicklist
;
73 pgd_quicklist
= (unsigned long *) pgd
;
79 pud_populate (struct mm_struct
*mm
, pud_t
*pud_entry
, pmd_t
*pmd
)
81 pud_val(*pud_entry
) = __pa(pmd
);
85 pmd_alloc_one_fast (struct mm_struct
*mm
, unsigned long addr
)
87 unsigned long *ret
= NULL
;
91 ret
= (unsigned long *)pmd_quicklist
;
92 if (likely(ret
!= NULL
)) {
93 pmd_quicklist
= (unsigned long *)(*ret
);
104 pmd_alloc_one (struct mm_struct
*mm
, unsigned long addr
)
106 pmd_t
*pmd
= (pmd_t
*)__get_free_page(GFP_KERNEL
|__GFP_REPEAT
|__GFP_ZERO
);
112 pmd_free (pmd_t
*pmd
)
115 *(unsigned long *)pmd
= (unsigned long) pmd_quicklist
;
116 pmd_quicklist
= (unsigned long *) pmd
;
117 ++pgtable_cache_size
;
121 #define __pmd_free_tlb(tlb, pmd) pmd_free(pmd)
124 pmd_populate (struct mm_struct
*mm
, pmd_t
*pmd_entry
, struct page
*pte
)
126 pmd_val(*pmd_entry
) = page_to_phys(pte
);
130 pmd_populate_kernel (struct mm_struct
*mm
, pmd_t
*pmd_entry
, pte_t
*pte
)
132 pmd_val(*pmd_entry
) = __pa(pte
);
135 static inline struct page
*
136 pte_alloc_one (struct mm_struct
*mm
, unsigned long addr
)
138 struct page
*pte
= alloc_pages(GFP_KERNEL
|__GFP_REPEAT
|__GFP_ZERO
, 0);
143 static inline pte_t
*
144 pte_alloc_one_kernel (struct mm_struct
*mm
, unsigned long addr
)
146 pte_t
*pte
= (pte_t
*)__get_free_page(GFP_KERNEL
|__GFP_REPEAT
|__GFP_ZERO
);
152 pte_free (struct page
*pte
)
158 pte_free_kernel (pte_t
*pte
)
160 free_page((unsigned long) pte
);
163 #define __pte_free_tlb(tlb, pte) tlb_remove_page((tlb), (pte))
165 extern void check_pgt_cache (void);
167 #endif /* _ASM_IA64_PGALLOC_H */