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

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef _M68K_PAGE_MM_H
  3 #define _M68K_PAGE_MM_H
  4 
  5 #ifndef __ASSEMBLY__
  6 
  7 #include <linux/compiler.h>
  8 #include <asm/module.h>
  9 
 10 /*
 11  * We don't need to check for alignment etc.
 12  */
 13 #ifdef CPU_M68040_OR_M68060_ONLY
 14 static inline void copy_page(void *to, void *from)
 15 {
 16   unsigned long tmp;
 17 
 18   __asm__ __volatile__("1:\t"
 19                        ".chip 68040\n\t"
 20                        "move16 %1@+,%0@+\n\t"
 21                        "move16 %1@+,%0@+\n\t"
 22                        ".chip 68k\n\t"
 23                        "dbra  %2,1b\n\t"
 24                        : "=a" (to), "=a" (from), "=d" (tmp)
 25                        : "" (to), "1" (from) , "2" (PAGE_SIZE / 32 - 1)
 26                        );
 27 }
 28 
 29 static inline void clear_page(void *page)
 30 {
 31         unsigned long tmp;
 32         unsigned long *sp = page;
 33 
 34         *sp++ = 0;
 35         *sp++ = 0;
 36         *sp++ = 0;
 37         *sp++ = 0;
 38 
 39         __asm__ __volatile__("1:\t"
 40                              ".chip 68040\n\t"
 41                              "move16 %2@+,%0@+\n\t"
 42                              ".chip 68k\n\t"
 43                              "subqw  #8,%2\n\t"
 44                              "subqw  #8,%2\n\t"
 45                              "dbra   %1,1b\n\t"
 46                              : "=a" (sp), "=d" (tmp)
 47                              : "a" (page), "" (sp),
 48                                "1" ((PAGE_SIZE - 16) / 16 - 1));
 49 }
 50 
 51 #else
 52 #define clear_page(page)        memset((page), 0, PAGE_SIZE)
 53 #define copy_page(to,from)      memcpy((to), (from), PAGE_SIZE)
 54 #endif
 55 
 56 #define clear_user_page(addr, vaddr, page)      \
 57         do {    clear_page(addr);               \
 58                 flush_dcache_page(page);        \
 59         } while (0)
 60 #define copy_user_page(to, from, vaddr, page)   \
 61         do {    copy_page(to, from);            \
 62                 flush_dcache_page(page);        \
 63         } while (0)
 64 
 65 extern unsigned long m68k_memoffset;
 66 
 67 #ifndef CONFIG_SUN3
 68 
 69 #define WANT_PAGE_VIRTUAL
 70 
 71 static inline unsigned long ___pa(void *vaddr)
 72 {
 73         unsigned long paddr;
 74         asm (
 75                 "1:     addl #0,%0\n"
 76                 m68k_fixup(%c2, 1b+2)
 77                 : "=r" (paddr)
 78                 : "" (vaddr), "i" (m68k_fixup_memoffset));
 79         return paddr;
 80 }
 81 #define __pa(vaddr)     ___pa((void *)(long)(vaddr))
 82 static inline void *__va(unsigned long paddr)
 83 {
 84         void *vaddr;
 85         asm (
 86                 "1:     subl #0,%0\n"
 87                 m68k_fixup(%c2, 1b+2)
 88                 : "=r" (vaddr)
 89                 : "" (paddr), "i" (m68k_fixup_memoffset));
 90         return vaddr;
 91 }
 92 
 93 #else   /* !CONFIG_SUN3 */
 94 /* This #define is a horrible hack to suppress lots of warnings. --m */
 95 #define __pa(x) ___pa((unsigned long)(x))
 96 static inline unsigned long ___pa(unsigned long x)
 97 {
 98      if(x == 0)
 99           return 0;
100      if(x >= PAGE_OFFSET)
101         return (x-PAGE_OFFSET);
102      else
103         return (x+0x2000000);
104 }
105 
106 static inline void *__va(unsigned long x)
107 {
108      if(x == 0)
109           return (void *)0;
110 
111      if(x < 0x2000000)
112         return (void *)(x+PAGE_OFFSET);
113      else
114         return (void *)(x-0x2000000);
115 }
116 #endif  /* CONFIG_SUN3 */
117 
118 /*
119  * NOTE: virtual isn't really correct, actually it should be the offset into the
120  * memory node, but we have no highmem, so that works for now.
121  * TODO: implement (fast) pfn<->pgdat_idx conversion functions, this makes lots
122  * of the shifts unnecessary.
123  */
124 #define virt_to_pfn(kaddr)      (__pa(kaddr) >> PAGE_SHIFT)
125 #define pfn_to_virt(pfn)        __va((pfn) << PAGE_SHIFT)
126 
127 extern int m68k_virt_to_node_shift;
128 
129 #ifndef CONFIG_DISCONTIGMEM
130 #define __virt_to_node(addr)    (&pg_data_map[0])
131 #else
132 extern struct pglist_data *pg_data_table[];
133 
134 static inline __attribute_const__ int __virt_to_node_shift(void)
135 {
136         int shift;
137 
138         asm (
139                 "1:     moveq   #0,%0\n"
140                 m68k_fixup(%c1, 1b)
141                 : "=d" (shift)
142                 : "i" (m68k_fixup_vnode_shift));
143         return shift;
144 }
145 
146 #define __virt_to_node(addr)    (pg_data_table[(unsigned long)(addr) >> __virt_to_node_shift()])
147 #endif
148 
149 #define virt_to_page(addr) ({                                           \
150         pfn_to_page(virt_to_pfn(addr));                                 \
151 })
152 #define page_to_virt(page) ({                                           \
153         pfn_to_virt(page_to_pfn(page));                                 \
154 })
155 
156 #ifdef CONFIG_DISCONTIGMEM
157 #define pfn_to_page(pfn) ({                                             \
158         unsigned long __pfn = (pfn);                                    \
159         struct pglist_data *pgdat;                                      \
160         pgdat = __virt_to_node((unsigned long)pfn_to_virt(__pfn));      \
161         pgdat->node_mem_map + (__pfn - pgdat->node_start_pfn);          \
162 })
163 #define page_to_pfn(_page) ({                                           \
164         const struct page *__p = (_page);                               \
165         struct pglist_data *pgdat;                                      \
166         pgdat = &pg_data_map[page_to_nid(__p)];                         \
167         ((__p) - pgdat->node_mem_map) + pgdat->node_start_pfn;          \
168 })
169 #else
170 #define ARCH_PFN_OFFSET (m68k_memory[0].addr >> PAGE_SHIFT)
171 #include <asm-generic/memory_model.h>
172 #endif
173 
174 #define virt_addr_valid(kaddr)  ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory)
175 #define pfn_valid(pfn)          virt_addr_valid(pfn_to_virt(pfn))
176 
177 #endif /* __ASSEMBLY__ */
178 
179 #endif /* _M68K_PAGE_MM_H */
180 

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