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Linux/arch/frv/mm/pgalloc.c

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  1 /* pgalloc.c: page directory & page table allocation
  2  *
  3  * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
  4  * Written by David Howells (dhowells@redhat.com)
  5  *
  6  * This program is free software; you can redistribute it and/or
  7  * modify it under the terms of the GNU General Public License
  8  * as published by the Free Software Foundation; either version
  9  * 2 of the License, or (at your option) any later version.
 10  */
 11 
 12 #include <linux/sched.h>
 13 #include <linux/gfp.h>
 14 #include <linux/mm.h>
 15 #include <linux/highmem.h>
 16 #include <linux/quicklist.h>
 17 #include <asm/pgalloc.h>
 18 #include <asm/page.h>
 19 #include <asm/cacheflush.h>
 20 
 21 pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((aligned(PAGE_SIZE)));
 22 
 23 pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
 24 {
 25         pte_t *pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT);
 26         if (pte)
 27                 clear_page(pte);
 28         return pte;
 29 }
 30 
 31 pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long address)
 32 {
 33         struct page *page;
 34 
 35 #ifdef CONFIG_HIGHPTE
 36         page = alloc_pages(GFP_KERNEL|__GFP_HIGHMEM|__GFP_REPEAT, 0);
 37 #else
 38         page = alloc_pages(GFP_KERNEL|__GFP_REPEAT, 0);
 39 #endif
 40         if (!page)
 41                 return NULL;
 42 
 43         clear_highpage(page);
 44         if (!pgtable_page_ctor(page)) {
 45                 __free_page(page);
 46                 return NULL;
 47         }
 48         flush_dcache_page(page);
 49         return page;
 50 }
 51 
 52 void __set_pmd(pmd_t *pmdptr, unsigned long pmd)
 53 {
 54         unsigned long *__ste_p = pmdptr->ste;
 55         int loop;
 56 
 57         if (!pmd) {
 58                 memset(__ste_p, 0, PME_SIZE);
 59         }
 60         else {
 61                 BUG_ON(pmd & (0x3f00 | xAMPRx_SS | 0xe));
 62 
 63                 for (loop = PME_SIZE; loop > 0; loop -= 4) {
 64                         *__ste_p++ = pmd;
 65                         pmd += __frv_PT_SIZE;
 66                 }
 67         }
 68 
 69         frv_dcache_writeback((unsigned long) pmdptr, (unsigned long) (pmdptr + 1));
 70 }
 71 
 72 /*
 73  * List of all pgd's needed for non-PAE so it can invalidate entries
 74  * in both cached and uncached pgd's; not needed for PAE since the
 75  * kernel pmd is shared. If PAE were not to share the pmd a similar
 76  * tactic would be needed. This is essentially codepath-based locking
 77  * against pageattr.c; it is the unique case in which a valid change
 78  * of kernel pagetables can't be lazily synchronized by vmalloc faults.
 79  * vmalloc faults work because attached pagetables are never freed.
 80  * If the locking proves to be non-performant, a ticketing scheme with
 81  * checks at dup_mmap(), exec(), and other mmlist addition points
 82  * could be used. The locking scheme was chosen on the basis of
 83  * manfred's recommendations and having no core impact whatsoever.
 84  * -- nyc
 85  */
 86 DEFINE_SPINLOCK(pgd_lock);
 87 struct page *pgd_list;
 88 
 89 static inline void pgd_list_add(pgd_t *pgd)
 90 {
 91         struct page *page = virt_to_page(pgd);
 92         page->index = (unsigned long) pgd_list;
 93         if (pgd_list)
 94                 set_page_private(pgd_list, (unsigned long) &page->index);
 95         pgd_list = page;
 96         set_page_private(page, (unsigned long)&pgd_list);
 97 }
 98 
 99 static inline void pgd_list_del(pgd_t *pgd)
100 {
101         struct page *next, **pprev, *page = virt_to_page(pgd);
102         next = (struct page *) page->index;
103         pprev = (struct page **) page_private(page);
104         *pprev = next;
105         if (next)
106                 set_page_private(next, (unsigned long) pprev);
107 }
108 
109 void pgd_ctor(void *pgd)
110 {
111         unsigned long flags;
112 
113         if (PTRS_PER_PMD == 1)
114                 spin_lock_irqsave(&pgd_lock, flags);
115 
116         memcpy((pgd_t *) pgd + USER_PGDS_IN_LAST_PML4,
117                swapper_pg_dir + USER_PGDS_IN_LAST_PML4,
118                (PTRS_PER_PGD - USER_PGDS_IN_LAST_PML4) * sizeof(pgd_t));
119 
120         if (PTRS_PER_PMD > 1)
121                 return;
122 
123         pgd_list_add(pgd);
124         spin_unlock_irqrestore(&pgd_lock, flags);
125         memset(pgd, 0, USER_PGDS_IN_LAST_PML4 * sizeof(pgd_t));
126 }
127 
128 /* never called when PTRS_PER_PMD > 1 */
129 void pgd_dtor(void *pgd)
130 {
131         unsigned long flags; /* can be called from interrupt context */
132 
133         spin_lock_irqsave(&pgd_lock, flags);
134         pgd_list_del(pgd);
135         spin_unlock_irqrestore(&pgd_lock, flags);
136 }
137 
138 pgd_t *pgd_alloc(struct mm_struct *mm)
139 {
140         return quicklist_alloc(0, GFP_KERNEL, pgd_ctor);
141 }
142 
143 void pgd_free(struct mm_struct *mm, pgd_t *pgd)
144 {
145         /* in the non-PAE case, clear_page_tables() clears user pgd entries */
146         quicklist_free(0, pgd_dtor, pgd);
147 }
148 
149 void __init pgtable_cache_init(void)
150 {
151 }
152 
153 void check_pgt_cache(void)
154 {
155         quicklist_trim(0, pgd_dtor, 25, 16);
156 }
157 
158 

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