1 #ifndef _ASM_CRIS_ARCH_MMU_H
2 #define _ASM_CRIS_ARCH_MMU_H
4 /* MMU context type. */
10 /* Kernel memory segments. */
11 #define KSEG_F 0xf0000000UL
12 #define KSEG_E 0xe0000000UL
13 #define KSEG_D 0xd0000000UL
14 #define KSEG_C 0xc0000000UL
15 #define KSEG_B 0xb0000000UL
16 #define KSEG_A 0xa0000000UL
17 #define KSEG_9 0x90000000UL
18 #define KSEG_8 0x80000000UL
19 #define KSEG_7 0x70000000UL
20 #define KSEG_6 0x60000000UL
21 #define KSEG_5 0x50000000UL
22 #define KSEG_4 0x40000000UL
23 #define KSEG_3 0x30000000UL
24 #define KSEG_2 0x20000000UL
25 #define KSEG_1 0x10000000UL
26 #define KSEG_0 0x00000000UL
31 * Bit: 31-13 12-5 4 3 2 1 0
32 * +-----+------+--------+-------+--------+-------+---------+
33 * | pfn | zero | global | valid | kernel | write | execute |
34 * +-----+------+--------+-------+--------+-------+---------+
38 * Defines for accessing the bits. Also define some synonyms for use with
39 * the software-based defined bits below.
41 #define _PAGE_EXECUTE (1 << 0) /* Execution bit. */
42 #define _PAGE_WE (1 << 1) /* Write bit. */
43 #define _PAGE_SILENT_WRITE (1 << 1) /* Same as above. */
44 #define _PAGE_KERNEL (1 << 2) /* Kernel mode page. */
45 #define _PAGE_VALID (1 << 3) /* Page is valid. */
46 #define _PAGE_SILENT_READ (1 << 3) /* Same as above. */
47 #define _PAGE_GLOBAL (1 << 4) /* Global page. */
50 * The hardware doesn't care about these bits, but the kernel uses them in
53 #define _PAGE_PRESENT (1 << 5) /* Page is present in memory. */
54 #define _PAGE_FILE (1 << 6) /* 1=pagecache, 0=swap (when !present) */
55 #define _PAGE_ACCESSED (1 << 6) /* Simulated in software using valid bit. */
56 #define _PAGE_MODIFIED (1 << 7) /* Simulated in software using we bit. */
57 #define _PAGE_READ (1 << 8) /* Read enabled. */
58 #define _PAGE_WRITE (1 << 9) /* Write enabled. */
60 /* Define some higher level generic page attributes. */
61 #define __READABLE (_PAGE_READ | _PAGE_SILENT_READ | _PAGE_ACCESSED)
62 #define __WRITEABLE (_PAGE_WRITE | _PAGE_SILENT_WRITE | _PAGE_MODIFIED)
64 #define _PAGE_TABLE (_PAGE_PRESENT | __READABLE | __WRITEABLE)
65 #define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_MODIFIED)
67 #define PAGE_NONE __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED)
68 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | __READABLE | _PAGE_WRITE | \
70 #define PAGE_SHARED_EXEC __pgprot(_PAGE_PRESENT | __READABLE | _PAGE_WRITE | \
71 _PAGE_ACCESSED | _PAGE_EXECUTE)
73 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | __READABLE)
74 #define PAGE_READONLY_EXEC __pgprot(_PAGE_PRESENT | __READABLE | _PAGE_EXECUTE | _PAGE_ACCESSED)
76 #define PAGE_COPY __pgprot(_PAGE_PRESENT | __READABLE)
77 #define PAGE_COPY_EXEC __pgprot(_PAGE_PRESENT | __READABLE | _PAGE_EXECUTE)
78 #define PAGE_KERNEL __pgprot(_PAGE_GLOBAL | _PAGE_KERNEL | \
79 _PAGE_PRESENT | __READABLE | __WRITEABLE)
80 #define PAGE_KERNEL_EXEC __pgprot(_PAGE_GLOBAL | _PAGE_KERNEL | _PAGE_EXECUTE | \
81 _PAGE_PRESENT | __READABLE | __WRITEABLE)
82 #define PAGE_SIGNAL_TRAMPOLINE __pgprot(_PAGE_GLOBAL | _PAGE_EXECUTE | \
83 _PAGE_PRESENT | __READABLE)
85 #define _KERNPG_TABLE (_PAGE_TABLE | _PAGE_KERNEL)
87 /* CRISv32 can do page protection for execute.
88 * Write permissions imply read permissions.
89 * Note that the numbers are in Execute-Write-Read order!
91 #define __P000 PAGE_NONE
92 #define __P001 PAGE_READONLY
93 #define __P010 PAGE_COPY
94 #define __P011 PAGE_COPY
95 #define __P100 PAGE_READONLY_EXEC
96 #define __P101 PAGE_READONLY_EXEC
97 #define __P110 PAGE_COPY_EXEC
98 #define __P111 PAGE_COPY_EXEC
100 #define __S000 PAGE_NONE
101 #define __S001 PAGE_READONLY
102 #define __S010 PAGE_SHARED
103 #define __S011 PAGE_SHARED
104 #define __S100 PAGE_READONLY_EXEC
105 #define __S101 PAGE_READONLY_EXEC
106 #define __S110 PAGE_SHARED_EXEC
107 #define __S111 PAGE_SHARED_EXEC
109 #define PTE_FILE_MAX_BITS 25
111 #endif /* _ASM_CRIS_ARCH_MMU_H */