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