1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _M68K_PGTABLE_H
3 #define _M68K_PGTABLE_H
4
5
6 #if defined(CONFIG_SUN3) || defined(CONFIG_COLDFIRE)
7 #include <asm-generic/pgtable-nopmd.h>
8 #else
9 #include <asm-generic/pgtable-nopud.h>
10 #endif
11
12 #include <asm/setup.h>
13
14 #ifndef __ASSEMBLY__
15 #include <asm/processor.h>
16 #include <linux/sched.h>
17 #include <linux/threads.h>
18
19 /*
20 * This file contains the functions and defines necessary to modify and use
21 * the m68k page table tree.
22 */
23
24 #include <asm/virtconvert.h>
25
26 /* Certain architectures need to do special things when pte's
27 * within a page table are directly modified. Thus, the following
28 * hook is made available.
29 */
30 #define set_pte(pteptr, pteval) \
31 do{ \
32 *(pteptr) = (pteval); \
33 } while(0)
34 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
35
36
37 /* PMD_SHIFT determines the size of the area a second-level page table can map */
38 #if CONFIG_PGTABLE_LEVELS == 3
39 #define PMD_SHIFT 18
40 #endif
41 #define PMD_SIZE (1UL << PMD_SHIFT)
42 #define PMD_MASK (~(PMD_SIZE-1))
43
44 /* PGDIR_SHIFT determines what a third-level page table entry can map */
45 #ifdef CONFIG_SUN3
46 #define PGDIR_SHIFT 17
47 #elif defined(CONFIG_COLDFIRE)
48 #define PGDIR_SHIFT 22
49 #else
50 #define PGDIR_SHIFT 25
51 #endif
52 #define PGDIR_SIZE (1UL << PGDIR_SHIFT)
53 #define PGDIR_MASK (~(PGDIR_SIZE-1))
54
55 /*
56 * entries per page directory level: the m68k is configured as three-level,
57 * so we do have PMD level physically.
58 */
59 #ifdef CONFIG_SUN3
60 #define PTRS_PER_PTE 16
61 #define __PAGETABLE_PMD_FOLDED 1
62 #define PTRS_PER_PMD 1
63 #define PTRS_PER_PGD 2048
64 #elif defined(CONFIG_COLDFIRE)
65 #define PTRS_PER_PTE 512
66 #define __PAGETABLE_PMD_FOLDED 1
67 #define PTRS_PER_PMD 1
68 #define PTRS_PER_PGD 1024
69 #else
70 #define PTRS_PER_PTE 64
71 #define PTRS_PER_PMD 128
72 #define PTRS_PER_PGD 128
73 #endif
74 #define USER_PTRS_PER_PGD (TASK_SIZE/PGDIR_SIZE)
75 #define FIRST_USER_ADDRESS 0UL
76
77 /* Virtual address region for use by kernel_map() */
78 #ifdef CONFIG_SUN3
79 #define KMAP_START 0x0dc00000
80 #define KMAP_END 0x0e000000
81 #elif defined(CONFIG_COLDFIRE)
82 #define KMAP_START 0xe0000000
83 #define KMAP_END 0xf0000000
84 #else
85 #define KMAP_START 0xd0000000
86 #define KMAP_END 0xf0000000
87 #endif
88
89 #ifdef CONFIG_SUN3
90 extern unsigned long m68k_vmalloc_end;
91 #define VMALLOC_START 0x0f800000
92 #define VMALLOC_END m68k_vmalloc_end
93 #elif defined(CONFIG_COLDFIRE)
94 #define VMALLOC_START 0xd0000000
95 #define VMALLOC_END 0xe0000000
96 #else
97 /* Just any arbitrary offset to the start of the vmalloc VM area: the
98 * current 8MB value just means that there will be a 8MB "hole" after the
99 * physical memory until the kernel virtual memory starts. That means that
100 * any out-of-bounds memory accesses will hopefully be caught.
101 * The vmalloc() routines leaves a hole of 4kB between each vmalloced
102 * area for the same reason. ;)
103 */
104 #define VMALLOC_OFFSET (8*1024*1024)
105 #define VMALLOC_START (((unsigned long) high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
106 #define VMALLOC_END KMAP_START
107 #endif
108
109 /* zero page used for uninitialized stuff */
110 extern void *empty_zero_page;
111
112 /*
113 * ZERO_PAGE is a global shared page that is always zero: used
114 * for zero-mapped memory areas etc..
115 */
116 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
117
118 /* number of bits that fit into a memory pointer */
119 #define BITS_PER_PTR (8*sizeof(unsigned long))
120
121 /* to align the pointer to a pointer address */
122 #define PTR_MASK (~(sizeof(void*)-1))
123
124 /* sizeof(void*)==1<<SIZEOF_PTR_LOG2 */
125 /* 64-bit machines, beware! SRB. */
126 #define SIZEOF_PTR_LOG2 2
127
128 extern void kernel_set_cachemode(void *addr, unsigned long size, int cmode);
129
130 /*
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.
134 */
update_mmu_cache(struct vm_area_struct * vma,unsigned long address,pte_t * ptep)135 static inline void update_mmu_cache(struct vm_area_struct *vma,
136 unsigned long address, pte_t *ptep)
137 {
138 }
139
140 #endif /* !__ASSEMBLY__ */
141
142 #define kern_addr_valid(addr) (1)
143
144 /* MMU-specific headers */
145
146 #ifdef CONFIG_SUN3
147 #include <asm/sun3_pgtable.h>
148 #elif defined(CONFIG_COLDFIRE)
149 #include <asm/mcf_pgtable.h>
150 #else
151 #include <asm/motorola_pgtable.h>
152 #endif
153
154 #ifndef __ASSEMBLY__
155 /*
156 * Macro to mark a page protection value as "uncacheable".
157 */
158 #ifdef CONFIG_COLDFIRE
159 # define pgprot_noncached(prot) (__pgprot(pgprot_val(prot) | CF_PAGE_NOCACHE))
160 #else
161 #ifdef SUN3_PAGE_NOCACHE
162 # define __SUN3_PAGE_NOCACHE SUN3_PAGE_NOCACHE
163 #else
164 # define __SUN3_PAGE_NOCACHE 0
165 #endif
166 #define pgprot_noncached(prot) \
167 (MMU_IS_SUN3 \
168 ? (__pgprot(pgprot_val(prot) | __SUN3_PAGE_NOCACHE)) \
169 : ((MMU_IS_851 || MMU_IS_030) \
170 ? (__pgprot(pgprot_val(prot) | _PAGE_NOCACHE030)) \
171 : (MMU_IS_040 || MMU_IS_060) \
172 ? (__pgprot((pgprot_val(prot) & _CACHEMASK040) | _PAGE_NOCACHE_S)) \
173 : (prot)))
174
175 pgprot_t pgprot_dmacoherent(pgprot_t prot);
176 #define pgprot_dmacoherent(prot) pgprot_dmacoherent(prot)
177
178 #endif /* CONFIG_COLDFIRE */
179 #endif /* !__ASSEMBLY__ */
180
181 #endif /* _M68K_PGTABLE_H */
182