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Linux/arch/mn10300/include/asm/highmem.h

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  1 /* MN10300 Virtual kernel memory mappings for high memory
  2  *
  3  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
  4  * Written by David Howells (dhowells@redhat.com)
  5  * - Derived from include/asm-i386/highmem.h
  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 #ifndef _ASM_HIGHMEM_H
 13 #define _ASM_HIGHMEM_H
 14 
 15 #ifdef __KERNEL__
 16 
 17 #include <linux/init.h>
 18 #include <linux/interrupt.h>
 19 #include <linux/highmem.h>
 20 #include <asm/kmap_types.h>
 21 #include <asm/pgtable.h>
 22 
 23 /* undef for production */
 24 #undef HIGHMEM_DEBUG
 25 
 26 /* declarations for highmem.c */
 27 extern unsigned long highstart_pfn, highend_pfn;
 28 
 29 extern pte_t *kmap_pte;
 30 extern pgprot_t kmap_prot;
 31 extern pte_t *pkmap_page_table;
 32 
 33 extern void __init kmap_init(void);
 34 
 35 /*
 36  * Right now we initialize only a single pte table. It can be extended
 37  * easily, subsequent pte tables have to be allocated in one physical
 38  * chunk of RAM.
 39  */
 40 #define PKMAP_BASE      0xfe000000UL
 41 #define LAST_PKMAP      1024
 42 #define LAST_PKMAP_MASK (LAST_PKMAP - 1)
 43 #define PKMAP_NR(virt)  ((virt - PKMAP_BASE) >> PAGE_SHIFT)
 44 #define PKMAP_ADDR(nr)  (PKMAP_BASE + ((nr) << PAGE_SHIFT))
 45 
 46 extern unsigned long kmap_high(struct page *page);
 47 extern void kunmap_high(struct page *page);
 48 
 49 static inline unsigned long kmap(struct page *page)
 50 {
 51         if (in_interrupt())
 52                 BUG();
 53         if (page < highmem_start_page)
 54                 return page_address(page);
 55         return kmap_high(page);
 56 }
 57 
 58 static inline void kunmap(struct page *page)
 59 {
 60         if (in_interrupt())
 61                 BUG();
 62         if (page < highmem_start_page)
 63                 return;
 64         kunmap_high(page);
 65 }
 66 
 67 /*
 68  * The use of kmap_atomic/kunmap_atomic is discouraged - kmap/kunmap
 69  * gives a more generic (and caching) interface. But kmap_atomic can
 70  * be used in IRQ contexts, so in some (very limited) cases we need
 71  * it.
 72  */
 73 static inline unsigned long kmap_atomic(struct page *page)
 74 {
 75         unsigned long vaddr;
 76         int idx, type;
 77 
 78         pagefault_disable();
 79         if (page < highmem_start_page)
 80                 return page_address(page);
 81 
 82         type = kmap_atomic_idx_push();
 83         idx = type + KM_TYPE_NR * smp_processor_id();
 84         vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
 85 #if HIGHMEM_DEBUG
 86         if (!pte_none(*(kmap_pte - idx)))
 87                 BUG();
 88 #endif
 89         set_pte(kmap_pte - idx, mk_pte(page, kmap_prot));
 90         local_flush_tlb_one(vaddr);
 91 
 92         return vaddr;
 93 }
 94 
 95 static inline void __kunmap_atomic(unsigned long vaddr)
 96 {
 97         int type;
 98 
 99         if (vaddr < FIXADDR_START) { /* FIXME */
100                 pagefault_enable();
101                 return;
102         }
103 
104         type = kmap_atomic_idx();
105 
106 #if HIGHMEM_DEBUG
107         {
108                 unsigned int idx;
109                 idx = type + KM_TYPE_NR * smp_processor_id();
110 
111                 if (vaddr != __fix_to_virt(FIX_KMAP_BEGIN + idx))
112                         BUG();
113 
114                 /*
115                  * force other mappings to Oops if they'll try to access
116                  * this pte without first remap it
117                  */
118                 pte_clear(kmap_pte - idx);
119                 local_flush_tlb_one(vaddr);
120         }
121 #endif
122 
123         kmap_atomic_idx_pop();
124         pagefault_enable();
125 }
126 #endif /* __KERNEL__ */
127 
128 #endif /* _ASM_HIGHMEM_H */
129 

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