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Linux/arch/mn10300/mm/pgtable.c

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  1 /* MN10300 Page table management
  2  *
  3  * Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
  4  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
  5  * Modified by David Howells (dhowells@redhat.com)
  6  *
  7  * This program is free software; you can redistribute it and/or
  8  * modify it under the terms of the GNU General Public Licence
  9  * as published by the Free Software Foundation; either version
 10  * 2 of the Licence, or (at your option) any later version.
 11  */
 12 #include <linux/sched.h>
 13 #include <linux/kernel.h>
 14 #include <linux/errno.h>
 15 #include <linux/gfp.h>
 16 #include <linux/mm.h>
 17 #include <linux/swap.h>
 18 #include <linux/smp.h>
 19 #include <linux/highmem.h>
 20 #include <linux/pagemap.h>
 21 #include <linux/spinlock.h>
 22 #include <linux/quicklist.h>
 23 
 24 #include <asm/pgtable.h>
 25 #include <asm/pgalloc.h>
 26 #include <asm/tlb.h>
 27 #include <asm/tlbflush.h>
 28 
 29 /*
 30  * Associate a large virtual page frame with a given physical page frame
 31  * and protection flags for that frame. pfn is for the base of the page,
 32  * vaddr is what the page gets mapped to - both must be properly aligned.
 33  * The pmd must already be instantiated. Assumes PAE mode.
 34  */
 35 void set_pmd_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags)
 36 {
 37         pgd_t *pgd;
 38         pud_t *pud;
 39         pmd_t *pmd;
 40 
 41         if (vaddr & (PMD_SIZE-1)) {             /* vaddr is misaligned */
 42                 printk(KERN_ERR "set_pmd_pfn: vaddr misaligned\n");
 43                 return; /* BUG(); */
 44         }
 45         if (pfn & (PTRS_PER_PTE-1)) {           /* pfn is misaligned */
 46                 printk(KERN_ERR "set_pmd_pfn: pfn misaligned\n");
 47                 return; /* BUG(); */
 48         }
 49         pgd = swapper_pg_dir + pgd_index(vaddr);
 50         if (pgd_none(*pgd)) {
 51                 printk(KERN_ERR "set_pmd_pfn: pgd_none\n");
 52                 return; /* BUG(); */
 53         }
 54         pud = pud_offset(pgd, vaddr);
 55         pmd = pmd_offset(pud, vaddr);
 56         set_pmd(pmd, pfn_pmd(pfn, flags));
 57         /*
 58          * It's enough to flush this one mapping.
 59          * (PGE mappings get flushed as well)
 60          */
 61         local_flush_tlb_one(vaddr);
 62 }
 63 
 64 pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
 65 {
 66         pte_t *pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT);
 67         if (pte)
 68                 clear_page(pte);
 69         return pte;
 70 }
 71 
 72 struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address)
 73 {
 74         struct page *pte;
 75 
 76 #ifdef CONFIG_HIGHPTE
 77         pte = alloc_pages(GFP_KERNEL|__GFP_HIGHMEM|__GFP_REPEAT, 0);
 78 #else
 79         pte = alloc_pages(GFP_KERNEL|__GFP_REPEAT, 0);
 80 #endif
 81         if (!pte)
 82                 return NULL;
 83         clear_highpage(pte);
 84         if (!pgtable_page_ctor(pte)) {
 85                 __free_page(pte);
 86                 return NULL;
 87         }
 88         return pte;
 89 }
 90 
 91 /*
 92  * List of all pgd's needed for non-PAE so it can invalidate entries
 93  * in both cached and uncached pgd's; not needed for PAE since the
 94  * kernel pmd is shared. If PAE were not to share the pmd a similar
 95  * tactic would be needed. This is essentially codepath-based locking
 96  * against pageattr.c; it is the unique case in which a valid change
 97  * of kernel pagetables can't be lazily synchronized by vmalloc faults.
 98  * vmalloc faults work because attached pagetables are never freed.
 99  * If the locking proves to be non-performant, a ticketing scheme with
100  * checks at dup_mmap(), exec(), and other mmlist addition points
101  * could be used. The locking scheme was chosen on the basis of
102  * manfred's recommendations and having no core impact whatsoever.
103  * -- nyc
104  */
105 DEFINE_SPINLOCK(pgd_lock);
106 struct page *pgd_list;
107 
108 static inline void pgd_list_add(pgd_t *pgd)
109 {
110         struct page *page = virt_to_page(pgd);
111         page->index = (unsigned long) pgd_list;
112         if (pgd_list)
113                 set_page_private(pgd_list, (unsigned long) &page->index);
114         pgd_list = page;
115         set_page_private(page, (unsigned long) &pgd_list);
116 }
117 
118 static inline void pgd_list_del(pgd_t *pgd)
119 {
120         struct page *next, **pprev, *page = virt_to_page(pgd);
121         next = (struct page *) page->index;
122         pprev = (struct page **) page_private(page);
123         *pprev = next;
124         if (next)
125                 set_page_private(next, (unsigned long) pprev);
126 }
127 
128 void pgd_ctor(void *pgd)
129 {
130         unsigned long flags;
131 
132         if (PTRS_PER_PMD == 1)
133                 spin_lock_irqsave(&pgd_lock, flags);
134 
135         memcpy((pgd_t *)pgd + USER_PTRS_PER_PGD,
136                         swapper_pg_dir + USER_PTRS_PER_PGD,
137                         (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
138 
139         if (PTRS_PER_PMD > 1)
140                 return;
141 
142         pgd_list_add(pgd);
143         spin_unlock_irqrestore(&pgd_lock, flags);
144         memset(pgd, 0, USER_PTRS_PER_PGD * sizeof(pgd_t));
145 }
146 
147 /* never called when PTRS_PER_PMD > 1 */
148 void pgd_dtor(void *pgd)
149 {
150         unsigned long flags; /* can be called from interrupt context */
151 
152         spin_lock_irqsave(&pgd_lock, flags);
153         pgd_list_del(pgd);
154         spin_unlock_irqrestore(&pgd_lock, flags);
155 }
156 
157 pgd_t *pgd_alloc(struct mm_struct *mm)
158 {
159         return quicklist_alloc(0, GFP_KERNEL, pgd_ctor);
160 }
161 
162 void pgd_free(struct mm_struct *mm, pgd_t *pgd)
163 {
164         quicklist_free(0, pgd_dtor, pgd);
165 }
166 
167 void __init pgtable_cache_init(void)
168 {
169 }
170 
171 void check_pgt_cache(void)
172 {
173         quicklist_trim(0, pgd_dtor, 25, 16);
174 }
175 

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