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1 | /* SPDX-License-Identifier: GPL-2.0 */ | |
2 | /* | |
3 | * CRIS MMU constants and PTE layout | |
4 | */ | |
5 | ||
6 | #ifndef _CRIS_ARCH_MMU_H | |
7 | #define _CRIS_ARCH_MMU_H | |
8 | ||
9 | /* type used in struct mm to couple an MMU context to an active mm */ | |
10 | ||
11 | typedef struct | |
12 | { | |
13 | unsigned int page_id; | |
14 | } mm_context_t; | |
15 | ||
16 | /* kernel memory segments */ | |
17 | ||
18 | #define KSEG_F 0xf0000000UL | |
19 | #define KSEG_E 0xe0000000UL | |
20 | #define KSEG_D 0xd0000000UL | |
21 | #define KSEG_C 0xc0000000UL | |
22 | #define KSEG_B 0xb0000000UL | |
23 | #define KSEG_A 0xa0000000UL | |
24 | #define KSEG_9 0x90000000UL | |
25 | #define KSEG_8 0x80000000UL | |
26 | #define KSEG_7 0x70000000UL | |
27 | #define KSEG_6 0x60000000UL | |
28 | #define KSEG_5 0x50000000UL | |
29 | #define KSEG_4 0x40000000UL | |
30 | #define KSEG_3 0x30000000UL | |
31 | #define KSEG_2 0x20000000UL | |
32 | #define KSEG_1 0x10000000UL | |
33 | #define KSEG_0 0x00000000UL | |
34 | ||
35 | /* CRIS PTE bits (see R_TLB_LO in the register description) | |
36 | * | |
37 | * Bit: 31 30-13 12-------4 3 2 1 0 | |
38 | * _______________________________________________________ | |
39 | * | cache |pfn | reserved | global | valid | kernel | we | | |
40 | * |_______|____|__________|________|_______|________|_____| | |
41 | * | |
42 | * (pfn = physical frame number) | |
43 | */ | |
44 | ||
45 | /* Real HW-based PTE bits. We use some synonym names so that | |
46 | * things become less confusing in combination with the SW-based | |
47 | * bits further below. | |
48 | * | |
49 | */ | |
50 | ||
51 | #define _PAGE_WE (1<<0) /* page is write-enabled */ | |
52 | #define _PAGE_SILENT_WRITE (1<<0) /* synonym */ | |
53 | #define _PAGE_KERNEL (1<<1) /* page is kernel only */ | |
54 | #define _PAGE_VALID (1<<2) /* page is valid */ | |
55 | #define _PAGE_SILENT_READ (1<<2) /* synonym */ | |
56 | #define _PAGE_GLOBAL (1<<3) /* global page - context is ignored */ | |
57 | #define _PAGE_NO_CACHE (1<<31) /* part of the uncached memory map */ | |
58 | ||
59 | /* Bits the HW doesn't care about but the kernel uses them in SW */ | |
60 | ||
61 | #define _PAGE_PRESENT (1<<4) /* page present in memory */ | |
62 | #define _PAGE_ACCESSED (1<<5) /* simulated in software using valid bit */ | |
63 | #define _PAGE_MODIFIED (1<<6) /* simulated in software using we bit */ | |
64 | #define _PAGE_READ (1<<7) /* read-enabled */ | |
65 | #define _PAGE_WRITE (1<<8) /* write-enabled */ | |
66 | ||
67 | /* Define some higher level generic page attributes. */ | |
68 | ||
69 | #define __READABLE (_PAGE_READ | _PAGE_SILENT_READ | _PAGE_ACCESSED) | |
70 | #define __WRITEABLE (_PAGE_WRITE | _PAGE_SILENT_WRITE | _PAGE_MODIFIED) | |
71 | ||
72 | #define _PAGE_TABLE (_PAGE_PRESENT | __READABLE | __WRITEABLE) | |
73 | #define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_MODIFIED) | |
74 | ||
75 | #define PAGE_NONE __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED) | |
76 | #define PAGE_SHARED __pgprot(_PAGE_PRESENT | __READABLE | _PAGE_WRITE | \ | |
77 | _PAGE_ACCESSED) | |
78 | #define PAGE_COPY __pgprot(_PAGE_PRESENT | __READABLE) // | _PAGE_COW | |
79 | #define PAGE_READONLY __pgprot(_PAGE_PRESENT | __READABLE) | |
80 | #define PAGE_KERNEL __pgprot(_PAGE_GLOBAL | _PAGE_KERNEL | \ | |
81 | _PAGE_PRESENT | __READABLE | __WRITEABLE) | |
82 | #define _KERNPG_TABLE (_PAGE_TABLE | _PAGE_KERNEL) | |
83 | ||
84 | /* | |
85 | * CRIS can't do page protection for execute, and considers read the same. | |
86 | * Also, write permissions imply read permissions. This is the closest we can | |
87 | * get.. | |
88 | */ | |
89 | ||
90 | #define __P000 PAGE_NONE | |
91 | #define __P001 PAGE_READONLY | |
92 | #define __P010 PAGE_COPY | |
93 | #define __P011 PAGE_COPY | |
94 | #define __P100 PAGE_READONLY | |
95 | #define __P101 PAGE_READONLY | |
96 | #define __P110 PAGE_COPY | |
97 | #define __P111 PAGE_COPY | |
98 | ||
99 | #define __S000 PAGE_NONE | |
100 | #define __S001 PAGE_READONLY | |
101 | #define __S010 PAGE_SHARED | |
102 | #define __S011 PAGE_SHARED | |
103 | #define __S100 PAGE_READONLY | |
104 | #define __S101 PAGE_READONLY | |
105 | #define __S110 PAGE_SHARED | |
106 | #define __S111 PAGE_SHARED | |
107 | ||
108 | #endif |