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Linux/arch/frv/mm/highmem.c

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  1 /* highmem.c: arch-specific highmem stuff
  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 #include <linux/highmem.h>
 12 #include <linux/module.h>
 13 
 14 void *kmap(struct page *page)
 15 {
 16         might_sleep();
 17         if (!PageHighMem(page))
 18                 return page_address(page);
 19         return kmap_high(page);
 20 }
 21 
 22 EXPORT_SYMBOL(kmap);
 23 
 24 void kunmap(struct page *page)
 25 {
 26         if (in_interrupt())
 27                 BUG();
 28         if (!PageHighMem(page))
 29                 return;
 30         kunmap_high(page);
 31 }
 32 
 33 EXPORT_SYMBOL(kunmap);
 34 
 35 struct page *kmap_atomic_to_page(void *ptr)
 36 {
 37         return virt_to_page(ptr);
 38 }
 39 
 40 void *kmap_atomic(struct page *page)
 41 {
 42         unsigned long paddr;
 43         int type;
 44 
 45         pagefault_disable();
 46         type = kmap_atomic_idx_push();
 47         paddr = page_to_phys(page);
 48 
 49         switch (type) {
 50         /*
 51          * The first 4 primary maps are reserved for architecture code
 52          */
 53         case 0:         return __kmap_atomic_primary(0, paddr, 6);
 54         case 1:         return __kmap_atomic_primary(0, paddr, 7);
 55         case 2:         return __kmap_atomic_primary(0, paddr, 8);
 56         case 3:         return __kmap_atomic_primary(0, paddr, 9);
 57         case 4:         return __kmap_atomic_primary(0, paddr, 10);
 58 
 59         case 5 ... 5 + NR_TLB_LINES - 1:
 60                 return __kmap_atomic_secondary(type - 5, paddr);
 61 
 62         default:
 63                 BUG();
 64                 return NULL;
 65         }
 66 }
 67 EXPORT_SYMBOL(kmap_atomic);
 68 
 69 void __kunmap_atomic(void *kvaddr)
 70 {
 71         int type = kmap_atomic_idx();
 72         switch (type) {
 73         case 0:         __kunmap_atomic_primary(0, 6);  break;
 74         case 1:         __kunmap_atomic_primary(0, 7);  break;
 75         case 2:         __kunmap_atomic_primary(0, 8);  break;
 76         case 3:         __kunmap_atomic_primary(0, 9);  break;
 77         case 4:         __kunmap_atomic_primary(0, 10); break;
 78 
 79         case 5 ... 5 + NR_TLB_LINES - 1:
 80                 __kunmap_atomic_secondary(type - 5, kvaddr);
 81                 break;
 82 
 83         default:
 84                 BUG();
 85         }
 86         kmap_atomic_idx_pop();
 87         pagefault_enable();
 88 }
 89 EXPORT_SYMBOL(__kunmap_atomic);
 90 

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