1 #ifndef _M68K_PGTABLE_H
2 #define _M68K_PGTABLE_H
4 #include <asm-generic/4level-fixup.h>
9 #include <asm/processor.h>
10 #include <linux/sched.h>
11 #include <linux/threads.h>
14 * This file contains the functions and defines necessary to modify and use
15 * the m68k page table tree.
18 #include <asm/virtconvert.h>
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.
24 #define set_pte(pteptr, pteval) \
26 *(pteptr) = (pteval); \
28 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
31 /* PMD_SHIFT determines the size of the area a second-level page table can map */
37 #define PMD_SIZE (1UL << PMD_SHIFT)
38 #define PMD_MASK (~(PMD_SIZE-1))
40 /* PGDIR_SHIFT determines what a third-level page table entry can map */
42 #define PGDIR_SHIFT 17
44 #define PGDIR_SHIFT 25
46 #define PGDIR_SIZE (1UL << PGDIR_SHIFT)
47 #define PGDIR_MASK (~(PGDIR_SIZE-1))
50 * entries per page directory level: the m68k is configured as three-level,
51 * so we do have PMD level physically.
54 #define PTRS_PER_PTE 16
55 #define PTRS_PER_PMD 1
56 #define PTRS_PER_PGD 2048
58 #define PTRS_PER_PTE 1024
59 #define PTRS_PER_PMD 8
60 #define PTRS_PER_PGD 128
62 #define USER_PTRS_PER_PGD (TASK_SIZE/PGDIR_SIZE)
63 #define FIRST_USER_ADDRESS 0
65 /* Virtual address region for use by kernel_map() */
67 #define KMAP_START 0x0DC00000
68 #define KMAP_END 0x0E000000
70 #define KMAP_START 0xd0000000
71 #define KMAP_END 0xf0000000
75 /* Just any arbitrary offset to the start of the vmalloc VM area: the
76 * current 8MB value just means that there will be a 8MB "hole" after the
77 * physical memory until the kernel virtual memory starts. That means that
78 * any out-of-bounds memory accesses will hopefully be caught.
79 * The vmalloc() routines leaves a hole of 4kB between each vmalloced
80 * area for the same reason. ;)
82 #define VMALLOC_OFFSET (8*1024*1024)
83 #define VMALLOC_START (((unsigned long) high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
84 #define VMALLOC_END KMAP_START
86 extern unsigned long vmalloc_end;
87 #define VMALLOC_START 0x0f800000
88 #define VMALLOC_END vmalloc_end
89 #endif /* CONFIG_SUN3 */
91 /* zero page used for uninitialized stuff */
92 extern void *empty_zero_page;
95 * ZERO_PAGE is a global shared page that is always zero: used
96 * for zero-mapped memory areas etc..
98 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
100 /* number of bits that fit into a memory pointer */
101 #define BITS_PER_PTR (8*sizeof(unsigned long))
103 /* to align the pointer to a pointer address */
104 #define PTR_MASK (~(sizeof(void*)-1))
106 /* sizeof(void*)==1<<SIZEOF_PTR_LOG2 */
107 /* 64-bit machines, beware! SRB. */
108 #define SIZEOF_PTR_LOG2 2
110 #define mm_end_of_chunk(addr, len) 0
112 extern void kernel_set_cachemode(void *addr, unsigned long size, int cmode);
115 * The m68k doesn't have any external MMU info: the kernel page
116 * tables contain all the necessary information. The Sun3 does, but
117 * they are updated on demand.
119 static inline void update_mmu_cache(struct vm_area_struct *vma,
120 unsigned long address, pte_t pte)
124 #endif /* !__ASSEMBLY__ */
126 #define kern_addr_valid(addr) (1)
128 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
129 remap_pfn_range(vma, vaddr, pfn, size, prot)
131 /* MMU-specific headers */
134 #include <asm/sun3_pgtable.h>
136 #include <asm/motorola_pgtable.h>
140 #include <asm-generic/pgtable.h>
143 * Macro to mark a page protection value as "uncacheable".
145 #ifdef SUN3_PAGE_NOCACHE
146 # define __SUN3_PAGE_NOCACHE SUN3_PAGE_NOCACHE
148 # define __SUN3_PAGE_NOCACHE 0
150 #define pgprot_noncached(prot) \
152 ? (__pgprot(pgprot_val(prot) | __SUN3_PAGE_NOCACHE)) \
153 : ((MMU_IS_851 || MMU_IS_030) \
154 ? (__pgprot(pgprot_val(prot) | _PAGE_NOCACHE030)) \
155 : (MMU_IS_040 || MMU_IS_060) \
156 ? (__pgprot((pgprot_val(prot) & _CACHEMASK040) | _PAGE_NOCACHE_S)) \
159 #endif /* !__ASSEMBLY__ */
162 * No page table caches to initialise
164 #define pgtable_cache_init() do { } while (0)
166 #define check_pgt_cache() do { } while (0)
168 #endif /* _M68K_PGTABLE_H */