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     30-13  12-5     4        3       2        1        0
32 *       +-------+-----+------+--------+-------+--------+-------+---------+
33 *       | cache | 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#define _PAGE_NO_CACHE	    (1 << 31)	/* part of the uncached memory map */
49
50
51/*
52 * The hardware doesn't care about these bits, but the kernel uses them in
53 * software.
54 */
55#define _PAGE_PRESENT   (1 << 5)   /* Page is present in memory. */
56#define _PAGE_ACCESSED  (1 << 6)   /* Simulated in software using valid bit. */
57#define _PAGE_MODIFIED  (1 << 7)   /* Simulated in software using we bit. */
58#define _PAGE_READ      (1 << 8)   /* Read enabled. */
59#define _PAGE_WRITE     (1 << 9)   /* Write enabled. */
60
61/* Define some higher level generic page attributes. */
62#define __READABLE      (_PAGE_READ | _PAGE_SILENT_READ | _PAGE_ACCESSED)
63#define __WRITEABLE     (_PAGE_WRITE | _PAGE_SILENT_WRITE | _PAGE_MODIFIED)
64
65#define _PAGE_TABLE	(_PAGE_PRESENT | __READABLE | __WRITEABLE)
66#define _PAGE_CHG_MASK  (PAGE_MASK | _PAGE_ACCESSED | _PAGE_MODIFIED)
67
68#define PAGE_NONE       __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED)
69#define PAGE_SHARED     __pgprot(_PAGE_PRESENT | __READABLE | _PAGE_WRITE | \
70                                 _PAGE_ACCESSED)
71#define PAGE_SHARED_EXEC __pgprot(_PAGE_PRESENT | __READABLE | _PAGE_WRITE | \
72                                  _PAGE_ACCESSED | _PAGE_EXECUTE)
73
74#define PAGE_READONLY   __pgprot(_PAGE_PRESENT | __READABLE)
75#define PAGE_READONLY_EXEC __pgprot(_PAGE_PRESENT | __READABLE | _PAGE_EXECUTE | _PAGE_ACCESSED)
76
77#define PAGE_COPY       __pgprot(_PAGE_PRESENT | __READABLE)
78#define PAGE_COPY_EXEC	__pgprot(_PAGE_PRESENT | __READABLE | _PAGE_EXECUTE)
79#define PAGE_KERNEL     __pgprot(_PAGE_GLOBAL | _PAGE_KERNEL | \
80                                 _PAGE_PRESENT | __READABLE | __WRITEABLE)
81#define PAGE_KERNEL_EXEC __pgprot(_PAGE_GLOBAL | _PAGE_KERNEL | _PAGE_EXECUTE | \
82                                 _PAGE_PRESENT | __READABLE | __WRITEABLE)
83#define PAGE_SIGNAL_TRAMPOLINE __pgprot(_PAGE_GLOBAL | _PAGE_EXECUTE | \
84                                       _PAGE_PRESENT | __READABLE)
85
86#define _KERNPG_TABLE   (_PAGE_TABLE | _PAGE_KERNEL)
87
88/* CRISv32 can do page protection for execute.
89 * Write permissions imply read permissions.
90 * Note that the numbers are in Execute-Write-Read order!
91 */
92#define __P000  PAGE_NONE
93#define __P001  PAGE_READONLY
94#define __P010  PAGE_COPY
95#define __P011  PAGE_COPY
96#define __P100  PAGE_READONLY_EXEC
97#define __P101  PAGE_READONLY_EXEC
98#define __P110  PAGE_COPY_EXEC
99#define __P111  PAGE_COPY_EXEC
100
101#define __S000  PAGE_NONE
102#define __S001  PAGE_READONLY
103#define __S010  PAGE_SHARED
104#define __S011  PAGE_SHARED
105#define __S100  PAGE_READONLY_EXEC
106#define __S101  PAGE_READONLY_EXEC
107#define __S110  PAGE_SHARED_EXEC
108#define __S111  PAGE_SHARED_EXEC
109
110#endif /* _ASM_CRIS_ARCH_MMU_H */
111