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Linux kernel mirror (for testing)
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linux
1#ifndef _ASM_CRIS_ARCH_MMU_H
2#define _ASM_CRIS_ARCH_MMU_H
3
4/* MMU context type. */
5typedef struct
6{
7 unsigned int page_id;
8} mm_context_t;
9
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
27
28/*
29 * CRISv32 PTE bits:
30 *
31 * Bit: 31-13 12-5 4 3 2 1 0
32 * +-----+------+--------+-------+--------+-------+---------+
33 * | pfn | zero | global | valid | kernel | write | execute |
34 * +-----+------+--------+-------+--------+-------+---------+
35 */
36
37/*
38 * Defines for accessing the bits. Also define some synonyms for use with
39 * the software-based defined bits below.
40 */
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. */
48
49/*
50 * The hardware doesn't care about these bits, but the kernel uses them in
51 * software.
52 */
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. */
59
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)
63
64#define _PAGE_TABLE (_PAGE_PRESENT | __READABLE | __WRITEABLE)
65#define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_MODIFIED)
66
67#define PAGE_NONE __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED)
68#define PAGE_SHARED __pgprot(_PAGE_PRESENT | __READABLE | _PAGE_WRITE | \
69 _PAGE_ACCESSED)
70#define PAGE_SHARED_EXEC __pgprot(_PAGE_PRESENT | __READABLE | _PAGE_WRITE | \
71 _PAGE_ACCESSED | _PAGE_EXECUTE)
72
73#define PAGE_READONLY __pgprot(_PAGE_PRESENT | __READABLE)
74#define PAGE_READONLY_EXEC __pgprot(_PAGE_PRESENT | __READABLE | _PAGE_EXECUTE | _PAGE_ACCESSED)
75
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)
84
85#define _KERNPG_TABLE (_PAGE_TABLE | _PAGE_KERNEL)
86
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!
90 */
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
99
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
108
109#define PTE_FILE_MAX_BITS 25
110
111#endif /* _ASM_CRIS_ARCH_MMU_H */