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Linux/arch/m68k/include/asm/page_mm.h

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  1 #ifndef _M68K_PAGE_MM_H
  2 #define _M68K_PAGE_MM_H
  3 
  4 #ifndef __ASSEMBLY__
  5 
  6 #include <linux/compiler.h>
  7 #include <asm/module.h>
  8 
  9 #define get_user_page(vaddr)            __get_free_page(GFP_KERNEL)
 10 #define free_user_page(page, addr)      free_page(addr)
 11 
 12 /*
 13  * We don't need to check for alignment etc.
 14  */
 15 #ifdef CPU_M68040_OR_M68060_ONLY
 16 static inline void copy_page(void *to, void *from)
 17 {
 18   unsigned long tmp;
 19 
 20   __asm__ __volatile__("1:\t"
 21                        ".chip 68040\n\t"
 22                        "move16 %1@+,%0@+\n\t"
 23                        "move16 %1@+,%0@+\n\t"
 24                        ".chip 68k\n\t"
 25                        "dbra  %2,1b\n\t"
 26                        : "=a" (to), "=a" (from), "=d" (tmp)
 27                        : "" (to), "1" (from) , "2" (PAGE_SIZE / 32 - 1)
 28                        );
 29 }
 30 
 31 static inline void clear_page(void *page)
 32 {
 33         unsigned long tmp;
 34         unsigned long *sp = page;
 35 
 36         *sp++ = 0;
 37         *sp++ = 0;
 38         *sp++ = 0;
 39         *sp++ = 0;
 40 
 41         __asm__ __volatile__("1:\t"
 42                              ".chip 68040\n\t"
 43                              "move16 %2@+,%0@+\n\t"
 44                              ".chip 68k\n\t"
 45                              "subqw  #8,%2\n\t"
 46                              "subqw  #8,%2\n\t"
 47                              "dbra   %1,1b\n\t"
 48                              : "=a" (sp), "=d" (tmp)
 49                              : "a" (page), "" (sp),
 50                                "1" ((PAGE_SIZE - 16) / 16 - 1));
 51 }
 52 
 53 #else
 54 #define clear_page(page)        memset((page), 0, PAGE_SIZE)
 55 #define copy_page(to,from)      memcpy((to), (from), PAGE_SIZE)
 56 #endif
 57 
 58 #define clear_user_page(addr, vaddr, page)      \
 59         do {    clear_page(addr);               \
 60                 flush_dcache_page(page);        \
 61         } while (0)
 62 #define copy_user_page(to, from, vaddr, page)   \
 63         do {    copy_page(to, from);            \
 64                 flush_dcache_page(page);        \
 65         } while (0)
 66 
 67 extern unsigned long m68k_memoffset;
 68 
 69 #ifndef CONFIG_SUN3
 70 
 71 #define WANT_PAGE_VIRTUAL
 72 
 73 static inline unsigned long ___pa(void *vaddr)
 74 {
 75         unsigned long paddr;
 76         asm (
 77                 "1:     addl #0,%0\n"
 78                 m68k_fixup(%c2, 1b+2)
 79                 : "=r" (paddr)
 80                 : "" (vaddr), "i" (m68k_fixup_memoffset));
 81         return paddr;
 82 }
 83 #define __pa(vaddr)     ___pa((void *)(long)(vaddr))
 84 static inline void *__va(unsigned long paddr)
 85 {
 86         void *vaddr;
 87         asm (
 88                 "1:     subl #0,%0\n"
 89                 m68k_fixup(%c2, 1b+2)
 90                 : "=r" (vaddr)
 91                 : "" (paddr), "i" (m68k_fixup_memoffset));
 92         return vaddr;
 93 }
 94 
 95 #else   /* !CONFIG_SUN3 */
 96 /* This #define is a horrible hack to suppress lots of warnings. --m */
 97 #define __pa(x) ___pa((unsigned long)(x))
 98 static inline unsigned long ___pa(unsigned long x)
 99 {
100      if(x == 0)
101           return 0;
102      if(x >= PAGE_OFFSET)
103         return (x-PAGE_OFFSET);
104      else
105         return (x+0x2000000);
106 }
107 
108 static inline void *__va(unsigned long x)
109 {
110      if(x == 0)
111           return (void *)0;
112 
113      if(x < 0x2000000)
114         return (void *)(x+PAGE_OFFSET);
115      else
116         return (void *)(x-0x2000000);
117 }
118 #endif  /* CONFIG_SUN3 */
119 
120 /*
121  * NOTE: virtual isn't really correct, actually it should be the offset into the
122  * memory node, but we have no highmem, so that works for now.
123  * TODO: implement (fast) pfn<->pgdat_idx conversion functions, this makes lots
124  * of the shifts unnecessary.
125  */
126 #define virt_to_pfn(kaddr)      (__pa(kaddr) >> PAGE_SHIFT)
127 #define pfn_to_virt(pfn)        __va((pfn) << PAGE_SHIFT)
128 
129 extern int m68k_virt_to_node_shift;
130 
131 #ifdef CONFIG_SINGLE_MEMORY_CHUNK
132 #define __virt_to_node(addr)    (&pg_data_map[0])
133 #else
134 extern struct pglist_data *pg_data_table[];
135 
136 static inline __attribute_const__ int __virt_to_node_shift(void)
137 {
138         int shift;
139 
140         asm (
141                 "1:     moveq   #0,%0\n"
142                 m68k_fixup(%c1, 1b)
143                 : "=d" (shift)
144                 : "i" (m68k_fixup_vnode_shift));
145         return shift;
146 }
147 
148 #define __virt_to_node(addr)    (pg_data_table[(unsigned long)(addr) >> __virt_to_node_shift()])
149 #endif
150 
151 #define virt_to_page(addr) ({                                           \
152         pfn_to_page(virt_to_pfn(addr));                                 \
153 })
154 #define page_to_virt(page) ({                                           \
155         pfn_to_virt(page_to_pfn(page));                                 \
156 })
157 
158 #define pfn_to_page(pfn) ({                                             \
159         unsigned long __pfn = (pfn);                                    \
160         struct pglist_data *pgdat;                                      \
161         pgdat = __virt_to_node((unsigned long)pfn_to_virt(__pfn));      \
162         pgdat->node_mem_map + (__pfn - pgdat->node_start_pfn);          \
163 })
164 #define page_to_pfn(_page) ({                                           \
165         const struct page *__p = (_page);                               \
166         struct pglist_data *pgdat;                                      \
167         pgdat = &pg_data_map[page_to_nid(__p)];                         \
168         ((__p) - pgdat->node_mem_map) + pgdat->node_start_pfn;          \
169 })
170 
171 #define virt_addr_valid(kaddr)  ((void *)(kaddr) >= (void *)PAGE_OFFSET && (void *)(kaddr) < high_memory)
172 #define pfn_valid(pfn)          virt_addr_valid(pfn_to_virt(pfn))
173 
174 #endif /* __ASSEMBLY__ */
175 
176 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
177                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
178 
179 #endif /* _M68K_PAGE_MM_H */
180 

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