linux/arch/x86/mm/iomap_32.c
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   1/*
   2 * Copyright \xC2\xA9 2008 Ingo Molnar
   3 *
   4 * This program is free software; you can redistribute it and/or modify
   5 * it under the terms of the GNU General Public License as published by
   6 * the Free Software Foundation; either version 2 of the License, or
   7 * (at your option) any later version.
   8 *
   9 * This program is distributed in the hope that it will be useful, but
  10 * WITHOUT ANY WARRANTY; without even the implied warranty of
  11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 * General Public License for more details.
  13 *
  14 * You should have received a copy of the GNU General Public License along
  15 * with this program; if not, write to the Free Software Foundation, Inc.,
  16 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  17 */
  18
  19#include <asm/iomap.h>
  20#include <linux/module.h>
  21
  22/* Map 'pfn' using fixed map 'type' and protections 'prot'
  23 */
  24void *
  25iomap_atomic_prot_pfn(unsigned long pfn, enum km_type type, pgprot_t prot)
  26{
  27        enum fixed_addresses idx;
  28        unsigned long vaddr;
  29
  30        pagefault_disable();
  31
  32        idx = type + KM_TYPE_NR*smp_processor_id();
  33        vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
  34        set_pte(kmap_pte-idx, pfn_pte(pfn, prot));
  35        arch_flush_lazy_mmu_mode();
  36
  37        return (void*) vaddr;
  38}
  39EXPORT_SYMBOL_GPL(iomap_atomic_prot_pfn);
  40
  41void
  42iounmap_atomic(void *kvaddr, enum km_type type)
  43{
  44        unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK;
  45        enum fixed_addresses idx = type + KM_TYPE_NR*smp_processor_id();
  46
  47        /*
  48         * Force other mappings to Oops if they'll try to access this pte
  49         * without first remap it.  Keeping stale mappings around is a bad idea
  50         * also, in case the page changes cacheability attributes or becomes
  51         * a protected page in a hypervisor.
  52         */
  53        if (vaddr == __fix_to_virt(FIX_KMAP_BEGIN+idx))
  54                kpte_clear_flush(kmap_pte-idx, vaddr);
  55
  56        arch_flush_lazy_mmu_mode();
  57        pagefault_enable();
  58}
  59EXPORT_SYMBOL_GPL(iounmap_atomic);
  60