1 #ifndef _M68K_PGTABLE_H
2 #define _M68K_PGTABLE_H
4 #include <asm-generic/4level-fixup.h>
6 #include <linux/config.h>
10 #include <asm/processor.h>
11 #include <linux/sched.h>
12 #include <linux/threads.h>
15 * This file contains the functions and defines necessary to modify and use
16 * the m68k page table tree.
19 #include <asm/virtconvert.h>
21 /* Certain architectures need to do special things when pte's
22 * within a page table are directly modified. Thus, the following
23 * hook is made available.
25 #define set_pte(pteptr, pteval) \
27 *(pteptr) = (pteval); \
29 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
32 /* PMD_SHIFT determines the size of the area a second-level page table can map */
38 #define PMD_SIZE (1UL << PMD_SHIFT)
39 #define PMD_MASK (~(PMD_SIZE-1))
41 /* PGDIR_SHIFT determines what a third-level page table entry can map */
43 #define PGDIR_SHIFT 17
45 #define PGDIR_SHIFT 25
47 #define PGDIR_SIZE (1UL << PGDIR_SHIFT)
48 #define PGDIR_MASK (~(PGDIR_SIZE-1))
51 * entries per page directory level: the m68k is configured as three-level,
52 * so we do have PMD level physically.
55 #define PTRS_PER_PTE 16
56 #define PTRS_PER_PMD 1
57 #define PTRS_PER_PGD 2048
59 #define PTRS_PER_PTE 1024
60 #define PTRS_PER_PMD 8
61 #define PTRS_PER_PGD 128
63 #define USER_PTRS_PER_PGD (TASK_SIZE/PGDIR_SIZE)
64 #define FIRST_USER_ADDRESS 0
66 /* Virtual address region for use by kernel_map() */
68 #define KMAP_START 0x0DC00000
69 #define KMAP_END 0x0E000000
71 #define KMAP_START 0xd0000000
72 #define KMAP_END 0xf0000000
76 /* Just any arbitrary offset to the start of the vmalloc VM area: the
77 * current 8MB value just means that there will be a 8MB "hole" after the
78 * physical memory until the kernel virtual memory starts. That means that
79 * any out-of-bounds memory accesses will hopefully be caught.
80 * The vmalloc() routines leaves a hole of 4kB between each vmalloced
81 * area for the same reason. ;)
83 #define VMALLOC_OFFSET (8*1024*1024)
84 #define VMALLOC_START (((unsigned long) high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
85 #define VMALLOC_END KMAP_START
87 extern unsigned long vmalloc_end;
88 #define VMALLOC_START 0x0f800000
89 #define VMALLOC_END vmalloc_end
90 #endif /* CONFIG_SUN3 */
92 /* zero page used for uninitialized stuff */
93 extern void *empty_zero_page;
96 * ZERO_PAGE is a global shared page that is always zero: used
97 * for zero-mapped memory areas etc..
99 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
101 /* number of bits that fit into a memory pointer */
102 #define BITS_PER_PTR (8*sizeof(unsigned long))
104 /* to align the pointer to a pointer address */
105 #define PTR_MASK (~(sizeof(void*)-1))
107 /* sizeof(void*)==1<<SIZEOF_PTR_LOG2 */
108 /* 64-bit machines, beware! SRB. */
109 #define SIZEOF_PTR_LOG2 2
112 * Check if the addr/len goes up to the end of a physical
113 * memory chunk. Used for DMA functions.
115 #ifdef CONFIG_SINGLE_MEMORY_CHUNK
117 * It makes no sense to consider whether we cross a memory boundary if
118 * we support just one physical chunk of memory.
120 static inline int mm_end_of_chunk(unsigned long addr, int len)
125 int mm_end_of_chunk (unsigned long addr, int len);
128 extern void kernel_set_cachemode(void *addr, unsigned long size, int cmode);
131 * The m68k doesn't have any external MMU info: the kernel page
132 * tables contain all the necessary information. The Sun3 does, but
133 * they are updated on demand.
135 static inline void update_mmu_cache(struct vm_area_struct *vma,
136 unsigned long address, pte_t pte)
140 #endif /* !__ASSEMBLY__ */
142 #define kern_addr_valid(addr) (1)
144 #define io_remap_page_range(vma, vaddr, paddr, size, prot) \
145 remap_pfn_range(vma, vaddr, (paddr) >> PAGE_SHIFT, size, prot)
147 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
148 remap_pfn_range(vma, vaddr, pfn, size, prot)
150 #define MK_IOSPACE_PFN(space, pfn) (pfn)
151 #define GET_IOSPACE(pfn) 0
152 #define GET_PFN(pfn) (pfn)
154 /* MMU-specific headers */
157 #include <asm/sun3_pgtable.h>
159 #include <asm/motorola_pgtable.h>
163 #include <asm-generic/pgtable.h>
166 * Macro to mark a page protection value as "uncacheable".
168 #ifdef SUN3_PAGE_NOCACHE
169 # define __SUN3_PAGE_NOCACHE SUN3_PAGE_NOCACHE
171 # define __SUN3_PAGE_NOCACHE 0
173 #define pgprot_noncached(prot) \
175 ? (__pgprot(pgprot_val(prot) | __SUN3_PAGE_NOCACHE)) \
176 : ((MMU_IS_851 || MMU_IS_030) \
177 ? (__pgprot(pgprot_val(prot) | _PAGE_NOCACHE030)) \
178 : (MMU_IS_040 || MMU_IS_060) \
179 ? (__pgprot((pgprot_val(prot) & _CACHEMASK040) | _PAGE_NOCACHE_S)) \
182 #endif /* !__ASSEMBLY__ */
185 * No page table caches to initialise
187 #define pgtable_cache_init() do { } while (0)
189 #define check_pgt_cache() do { } while (0)
191 #endif /* _M68K_PGTABLE_H */