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

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  1 #ifndef _M68K_PGTABLE_H
  2 #define _M68K_PGTABLE_H
  3 
  4 #include <asm-generic/4level-fixup.h>
  5 
  6 #include <asm/setup.h>
  7 
  8 #ifndef __ASSEMBLY__
  9 #include <asm/processor.h>
 10 #include <linux/sched.h>
 11 #include <linux/threads.h>
 12 
 13 /*
 14  * This file contains the functions and defines necessary to modify and use
 15  * the m68k page table tree.
 16  */
 17 
 18 #include <asm/virtconvert.h>
 19 
 20 /* Certain architectures need to do special things when pte's
 21  * within a page table are directly modified.  Thus, the following
 22  * hook is made available.
 23  */
 24 #define set_pte(pteptr, pteval)                                 \
 25         do{                                                     \
 26                 *(pteptr) = (pteval);                           \
 27         } while(0)
 28 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
 29 
 30 
 31 /* PMD_SHIFT determines the size of the area a second-level page table can map */
 32 #ifdef CONFIG_SUN3
 33 #define PMD_SHIFT       17
 34 #else
 35 #define PMD_SHIFT       22
 36 #endif
 37 #define PMD_SIZE        (1UL << PMD_SHIFT)
 38 #define PMD_MASK        (~(PMD_SIZE-1))
 39 
 40 /* PGDIR_SHIFT determines what a third-level page table entry can map */
 41 #ifdef CONFIG_SUN3
 42 #define PGDIR_SHIFT     17
 43 #elif defined(CONFIG_COLDFIRE)
 44 #define PGDIR_SHIFT     22
 45 #else
 46 #define PGDIR_SHIFT     25
 47 #endif
 48 #define PGDIR_SIZE      (1UL << PGDIR_SHIFT)
 49 #define PGDIR_MASK      (~(PGDIR_SIZE-1))
 50 
 51 /*
 52  * entries per page directory level: the m68k is configured as three-level,
 53  * so we do have PMD level physically.
 54  */
 55 #ifdef CONFIG_SUN3
 56 #define PTRS_PER_PTE   16
 57 #define __PAGETABLE_PMD_FOLDED
 58 #define PTRS_PER_PMD   1
 59 #define PTRS_PER_PGD   2048
 60 #elif defined(CONFIG_COLDFIRE)
 61 #define PTRS_PER_PTE    512
 62 #define __PAGETABLE_PMD_FOLDED
 63 #define PTRS_PER_PMD    1
 64 #define PTRS_PER_PGD    1024
 65 #else
 66 #define PTRS_PER_PTE    1024
 67 #define PTRS_PER_PMD    8
 68 #define PTRS_PER_PGD    128
 69 #endif
 70 #define USER_PTRS_PER_PGD       (TASK_SIZE/PGDIR_SIZE)
 71 #define FIRST_USER_ADDRESS      0UL
 72 
 73 /* Virtual address region for use by kernel_map() */
 74 #ifdef CONFIG_SUN3
 75 #define KMAP_START     0x0DC00000
 76 #define KMAP_END       0x0E000000
 77 #elif defined(CONFIG_COLDFIRE)
 78 #define KMAP_START      0xe0000000
 79 #define KMAP_END        0xf0000000
 80 #else
 81 #define KMAP_START      0xd0000000
 82 #define KMAP_END        0xf0000000
 83 #endif
 84 
 85 #ifdef CONFIG_SUN3
 86 extern unsigned long m68k_vmalloc_end;
 87 #define VMALLOC_START 0x0f800000
 88 #define VMALLOC_END m68k_vmalloc_end
 89 #elif defined(CONFIG_COLDFIRE)
 90 #define VMALLOC_START   0xd0000000
 91 #define VMALLOC_END     0xe0000000
 92 #else
 93 /* Just any arbitrary offset to the start of the vmalloc VM area: the
 94  * current 8MB value just means that there will be a 8MB "hole" after the
 95  * physical memory until the kernel virtual memory starts.  That means that
 96  * any out-of-bounds memory accesses will hopefully be caught.
 97  * The vmalloc() routines leaves a hole of 4kB between each vmalloced
 98  * area for the same reason. ;)
 99  */
100 #define VMALLOC_OFFSET  (8*1024*1024)
101 #define VMALLOC_START (((unsigned long) high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
102 #define VMALLOC_END KMAP_START
103 #endif
104 
105 /* zero page used for uninitialized stuff */
106 extern void *empty_zero_page;
107 
108 /*
109  * ZERO_PAGE is a global shared page that is always zero: used
110  * for zero-mapped memory areas etc..
111  */
112 #define ZERO_PAGE(vaddr)        (virt_to_page(empty_zero_page))
113 
114 /* number of bits that fit into a memory pointer */
115 #define BITS_PER_PTR                    (8*sizeof(unsigned long))
116 
117 /* to align the pointer to a pointer address */
118 #define PTR_MASK                        (~(sizeof(void*)-1))
119 
120 /* sizeof(void*)==1<<SIZEOF_PTR_LOG2 */
121 /* 64-bit machines, beware!  SRB. */
122 #define SIZEOF_PTR_LOG2                        2
123 
124 extern void kernel_set_cachemode(void *addr, unsigned long size, int cmode);
125 
126 /*
127  * The m68k doesn't have any external MMU info: the kernel page
128  * tables contain all the necessary information.  The Sun3 does, but
129  * they are updated on demand.
130  */
131 static inline void update_mmu_cache(struct vm_area_struct *vma,
132                                     unsigned long address, pte_t *ptep)
133 {
134 }
135 
136 #endif /* !__ASSEMBLY__ */
137 
138 #define kern_addr_valid(addr)   (1)
139 
140 /* MMU-specific headers */
141 
142 #ifdef CONFIG_SUN3
143 #include <asm/sun3_pgtable.h>
144 #elif defined(CONFIG_COLDFIRE)
145 #include <asm/mcf_pgtable.h>
146 #else
147 #include <asm/motorola_pgtable.h>
148 #endif
149 
150 #ifndef __ASSEMBLY__
151 /*
152  * Macro to mark a page protection value as "uncacheable".
153  */
154 #ifdef CONFIG_COLDFIRE
155 # define pgprot_noncached(prot) (__pgprot(pgprot_val(prot) | CF_PAGE_NOCACHE))
156 #else
157 #ifdef SUN3_PAGE_NOCACHE
158 # define __SUN3_PAGE_NOCACHE    SUN3_PAGE_NOCACHE
159 #else
160 # define __SUN3_PAGE_NOCACHE    0
161 #endif
162 #define pgprot_noncached(prot)                                                  \
163         (MMU_IS_SUN3                                                            \
164          ? (__pgprot(pgprot_val(prot) | __SUN3_PAGE_NOCACHE))                   \
165          : ((MMU_IS_851 || MMU_IS_030)                                          \
166             ? (__pgprot(pgprot_val(prot) | _PAGE_NOCACHE030))                   \
167             : (MMU_IS_040 || MMU_IS_060)                                        \
168             ? (__pgprot((pgprot_val(prot) & _CACHEMASK040) | _PAGE_NOCACHE_S))  \
169             : (prot)))
170 
171 #endif /* CONFIG_COLDFIRE */
172 #include <asm-generic/pgtable.h>
173 #endif /* !__ASSEMBLY__ */
174 
175 /*
176  * No page table caches to initialise
177  */
178 #define pgtable_cache_init()    do { } while (0)
179 
180 #define check_pgt_cache()       do { } while (0)
181 
182 #endif /* _M68K_PGTABLE_H */
183 

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