1 /* SPDX-License-Identifier: GPL-2.0 */ 1
2 /*
3 * Copyright (C) 2008-2009 Michal Simek <monst
4 * Copyright (C) 2008-2009 PetaLogix
5 * Copyright (C) 2006 Atmark Techno, Inc.
6 */
7
8 #ifndef _ASM_MICROBLAZE_MMU_H
9 #define _ASM_MICROBLAZE_MMU_H
10
11 # ifdef __KERNEL__
12 # ifndef __ASSEMBLY__
13
14 /* Default "unsigned long" context */
15 typedef unsigned long mm_context_t;
16
17 /* Hardware Page Table Entry */
18 typedef struct _PTE {
19 unsigned long v:1; /* Entry is va
20 unsigned long vsid:24; /* Virtual seg
21 unsigned long h:1; /* Hash algori
22 unsigned long api:6; /* Abbreviated
23 unsigned long rpn:20; /* Real (physi
24 unsigned long :3; /* Unused */
25 unsigned long r:1; /* Referenced
26 unsigned long c:1; /* Changed */
27 unsigned long w:1; /* Write-thru
28 unsigned long i:1; /* Cache inhib
29 unsigned long m:1; /* Memory cohe
30 unsigned long g:1; /* Guarded */
31 unsigned long :1; /* Unused */
32 unsigned long pp:2; /* Page protec
33 } PTE;
34
35 /* Values for PP (assumes Ks=0, Kp=1) */
36 # define PP_RWXX 0 /* Supervisor read/w
37 # define PP_RWRX 1 /* Supervisor read/w
38 # define PP_RWRW 2 /* Supervisor read/w
39 # define PP_RXRX 3 /* Supervisor read,
40
41 /* Segment Register */
42 typedef struct _SEGREG {
43 unsigned long t:1; /* Normal or I
44 unsigned long ks:1; /* Supervisor
45 unsigned long kp:1; /* User 'key'
46 unsigned long n:1; /* No-execute
47 unsigned long :4; /* Unused */
48 unsigned long vsid:24; /* Virtual Seg
49 } SEGREG;
50
51 extern void _tlbie(unsigned long va); /* inv
52 extern void _tlbia(void); /* inv
53
54 /*
55 * tlb_skip size stores actual number skipped
56 * mapping has to increase tlb_skip size.
57 */
58 extern u32 tlb_skip;
59 # endif /* __ASSEMBLY__ */
60
61 /*
62 * The MicroBlaze processor has a TLB architec
63 * instruction and data sides share a unified,
64 * TLB which is maintained totally under softw
65 * instruction side has a hardware-managed, 2,
66 * TLB which serves as a first level to the sh
67 * known as the UTLB and ITLB, respectively.
68 */
69
70 # define MICROBLAZE_TLB_SIZE 64
71
72 /* For cases when you want to skip some TLB en
73 # define MICROBLAZE_TLB_SKIP 0
74
75 /* Use the last TLB for temporary access to LM
76 # define MICROBLAZE_LMB_TLB_ID 63
77
78 /*
79 * TLB entries are defined by a "high" tag por
80 * portion. The data portion is 32-bits.
81 *
82 * TLB entries are managed entirely under soft
83 * writing, and searching using the MTS and MF
84 */
85
86 # define TLB_LO 1
87 # define TLB_HI 0
88 # define TLB_DATA TLB_LO
89 # define TLB_TAG TLB_HI
90
91 /* Tag portion */
92 # define TLB_EPN_MASK 0xFFFFFC00 /*
93 # define TLB_PAGESZ_MASK 0x00000380
94 # define TLB_PAGESZ(x) (((x) & 0x7) <
95 # define PAGESZ_1K 0
96 # define PAGESZ_4K 1
97 # define PAGESZ_16K 2
98 # define PAGESZ_64K 3
99 # define PAGESZ_256K 4
100 # define PAGESZ_1M 5
101 # define PAGESZ_4M 6
102 # define PAGESZ_16M 7
103 # define TLB_VALID 0x00000040 /*
104
105 /* Data portion */
106 # define TLB_RPN_MASK 0xFFFFFC00 /*
107 # define TLB_PERM_MASK 0x00000300
108 # define TLB_EX 0x00000200 /*
109 # define TLB_WR 0x00000100 /*
110 # define TLB_ZSEL_MASK 0x000000F0
111 # define TLB_ZSEL(x) (((x) & 0xF) <
112 # define TLB_ATTR_MASK 0x0000000F
113 # define TLB_W 0x00000008 /*
114 # define TLB_I 0x00000004 /*
115 # define TLB_M 0x00000002 /*
116 # define TLB_G 0x00000001 /*
117
118 # endif /* __KERNEL__ */
119 #endif /* _ASM_MICROBLAZE_MMU_H */
120
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.