Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64...
[linux-2.6-block.git] / arch / arm64 / include / asm / pgtable-hwdef.h
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1/*
2 * Copyright (C) 2012 ARM Ltd.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
15 */
16#ifndef __ASM_PGTABLE_HWDEF_H
17#define __ASM_PGTABLE_HWDEF_H
18
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19/*
20 * Number of page-table levels required to address 'va_bits' wide
21 * address, without section mapping. We resolve the top (va_bits - PAGE_SHIFT)
22 * bits with (PAGE_SHIFT - 3) bits at each page table level. Hence:
23 *
24 * levels = DIV_ROUND_UP((va_bits - PAGE_SHIFT), (PAGE_SHIFT - 3))
25 *
26 * where DIV_ROUND_UP(n, d) => (((n) + (d) - 1) / (d))
27 *
28 * We cannot include linux/kernel.h which defines DIV_ROUND_UP here
29 * due to build issues. So we open code DIV_ROUND_UP here:
30 *
31 * ((((va_bits) - PAGE_SHIFT) + (PAGE_SHIFT - 3) - 1) / (PAGE_SHIFT - 3))
32 *
33 * which gets simplified as :
34 */
35#define ARM64_HW_PGTABLE_LEVELS(va_bits) (((va_bits) - 4) / (PAGE_SHIFT - 3))
36
37/*
38 * Size mapped by an entry at level n ( 0 <= n <= 3)
39 * We map (PAGE_SHIFT - 3) at all translation levels and PAGE_SHIFT bits
40 * in the final page. The maximum number of translation levels supported by
41 * the architecture is 4. Hence, starting at at level n, we have further
42 * ((4 - n) - 1) levels of translation excluding the offset within the page.
43 * So, the total number of bits mapped by an entry at level n is :
44 *
45 * ((4 - n) - 1) * (PAGE_SHIFT - 3) + PAGE_SHIFT
46 *
47 * Rearranging it a bit we get :
48 * (4 - n) * (PAGE_SHIFT - 3) + 3
49 */
50#define ARM64_HW_PGTABLE_LEVEL_SHIFT(n) ((PAGE_SHIFT - 3) * (4 - (n)) + 3)
51
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52#define PTRS_PER_PTE (1 << (PAGE_SHIFT - 3))
53
54/*
55 * PMD_SHIFT determines the size a level 2 page table entry can map.
56 */
9f25e6ad 57#if CONFIG_PGTABLE_LEVELS > 2
686e7838 58#define PMD_SHIFT ARM64_HW_PGTABLE_LEVEL_SHIFT(2)
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59#define PMD_SIZE (_AC(1, UL) << PMD_SHIFT)
60#define PMD_MASK (~(PMD_SIZE-1))
61#define PTRS_PER_PMD PTRS_PER_PTE
62#endif
63
64/*
65 * PUD_SHIFT determines the size a level 1 page table entry can map.
66 */
9f25e6ad 67#if CONFIG_PGTABLE_LEVELS > 3
686e7838 68#define PUD_SHIFT ARM64_HW_PGTABLE_LEVEL_SHIFT(1)
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69#define PUD_SIZE (_AC(1, UL) << PUD_SHIFT)
70#define PUD_MASK (~(PUD_SIZE-1))
71#define PTRS_PER_PUD PTRS_PER_PTE
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72#endif
73
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74/*
75 * PGDIR_SHIFT determines the size a top-level page table entry can map
76 * (depending on the configuration, this level can be 0, 1 or 2).
77 */
686e7838 78#define PGDIR_SHIFT ARM64_HW_PGTABLE_LEVEL_SHIFT(4 - CONFIG_PGTABLE_LEVELS)
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79#define PGDIR_SIZE (_AC(1, UL) << PGDIR_SHIFT)
80#define PGDIR_MASK (~(PGDIR_SIZE-1))
81#define PTRS_PER_PGD (1 << (VA_BITS - PGDIR_SHIFT))
82
83/*
84 * Section address mask and size definitions.
85 */
86#define SECTION_SHIFT PMD_SHIFT
87#define SECTION_SIZE (_AC(1, UL) << SECTION_SHIFT)
88#define SECTION_MASK (~(SECTION_SIZE-1))
89
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90/*
91 * Contiguous page definitions.
92 */
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93#ifdef CONFIG_ARM64_64K_PAGES
94#define CONT_PTE_SHIFT 5
95#define CONT_PMD_SHIFT 5
96#elif defined(CONFIG_ARM64_16K_PAGES)
97#define CONT_PTE_SHIFT 7
98#define CONT_PMD_SHIFT 5
99#else
100#define CONT_PTE_SHIFT 4
101#define CONT_PMD_SHIFT 4
102#endif
103
104#define CONT_PTES (1 << CONT_PTE_SHIFT)
105#define CONT_PTE_SIZE (CONT_PTES * PAGE_SIZE)
106#define CONT_PTE_MASK (~(CONT_PTE_SIZE - 1))
107#define CONT_PMDS (1 << CONT_PMD_SHIFT)
108#define CONT_PMD_SIZE (CONT_PMDS * PMD_SIZE)
109#define CONT_PMD_MASK (~(CONT_PMD_SIZE - 1))
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110/* the the numerical offset of the PTE within a range of CONT_PTES */
111#define CONT_RANGE_OFFSET(addr) (((addr)>>PAGE_SHIFT)&(CONT_PTES-1))
112
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113/*
114 * Hardware page table definitions.
115 *
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116 * Level 1 descriptor (PUD).
117 */
c79b954b 118#define PUD_TYPE_TABLE (_AT(pudval_t, 3) << 0)
084bd298 119#define PUD_TABLE_BIT (_AT(pgdval_t, 1) << 1)
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120#define PUD_TYPE_MASK (_AT(pgdval_t, 3) << 0)
121#define PUD_TYPE_SECT (_AT(pgdval_t, 1) << 0)
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122
123/*
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124 * Level 2 descriptor (PMD).
125 */
126#define PMD_TYPE_MASK (_AT(pmdval_t, 3) << 0)
127#define PMD_TYPE_FAULT (_AT(pmdval_t, 0) << 0)
128#define PMD_TYPE_TABLE (_AT(pmdval_t, 3) << 0)
129#define PMD_TYPE_SECT (_AT(pmdval_t, 1) << 0)
084bd298 130#define PMD_TABLE_BIT (_AT(pmdval_t, 1) << 1)
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131
132/*
133 * Section
134 */
af074848 135#define PMD_SECT_VALID (_AT(pmdval_t, 1) << 0)
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136#define PMD_SECT_USER (_AT(pmdval_t, 1) << 6) /* AP[1] */
137#define PMD_SECT_RDONLY (_AT(pmdval_t, 1) << 7) /* AP[2] */
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138#define PMD_SECT_S (_AT(pmdval_t, 3) << 8)
139#define PMD_SECT_AF (_AT(pmdval_t, 1) << 10)
140#define PMD_SECT_NG (_AT(pmdval_t, 1) << 11)
ecf35a23 141#define PMD_SECT_CONT (_AT(pmdval_t, 1) << 52)
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142#define PMD_SECT_PXN (_AT(pmdval_t, 1) << 53)
143#define PMD_SECT_UXN (_AT(pmdval_t, 1) << 54)
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144
145/*
146 * AttrIndx[2:0] encoding (mapping attributes defined in the MAIR* registers).
147 */
148#define PMD_ATTRINDX(t) (_AT(pmdval_t, (t)) << 2)
149#define PMD_ATTRINDX_MASK (_AT(pmdval_t, 7) << 2)
150
151/*
152 * Level 3 descriptor (PTE).
153 */
154#define PTE_TYPE_MASK (_AT(pteval_t, 3) << 0)
155#define PTE_TYPE_FAULT (_AT(pteval_t, 0) << 0)
156#define PTE_TYPE_PAGE (_AT(pteval_t, 3) << 0)
084bd298 157#define PTE_TABLE_BIT (_AT(pteval_t, 1) << 1)
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158#define PTE_USER (_AT(pteval_t, 1) << 6) /* AP[1] */
159#define PTE_RDONLY (_AT(pteval_t, 1) << 7) /* AP[2] */
160#define PTE_SHARED (_AT(pteval_t, 3) << 8) /* SH[1:0], inner shareable */
161#define PTE_AF (_AT(pteval_t, 1) << 10) /* Access Flag */
162#define PTE_NG (_AT(pteval_t, 1) << 11) /* nG */
2f4b829c 163#define PTE_DBM (_AT(pteval_t, 1) << 51) /* Dirty Bit Management */
ecf35a23 164#define PTE_CONT (_AT(pteval_t, 1) << 52) /* Contiguous range */
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165#define PTE_PXN (_AT(pteval_t, 1) << 53) /* Privileged XN */
166#define PTE_UXN (_AT(pteval_t, 1) << 54) /* User XN */
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167
168/*
169 * AttrIndx[2:0] encoding (mapping attributes defined in the MAIR* registers).
170 */
171#define PTE_ATTRINDX(t) (_AT(pteval_t, (t)) << 2)
172#define PTE_ATTRINDX_MASK (_AT(pteval_t, 7) << 2)
173
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174/*
175 * 2nd stage PTE definitions
176 */
177#define PTE_S2_RDONLY (_AT(pteval_t, 1) << 6) /* HAP[2:1] */
178#define PTE_S2_RDWR (_AT(pteval_t, 3) << 6) /* HAP[2:1] */
179
8199ed0e 180#define PMD_S2_RDONLY (_AT(pmdval_t, 1) << 6) /* HAP[2:1] */
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181#define PMD_S2_RDWR (_AT(pmdval_t, 3) << 6) /* HAP[2:1] */
182
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183/*
184 * Memory Attribute override for Stage-2 (MemAttr[3:0])
185 */
186#define PTE_S2_MEMATTR(t) (_AT(pteval_t, (t)) << 2)
187#define PTE_S2_MEMATTR_MASK (_AT(pteval_t, 0xf) << 2)
188
189/*
190 * EL2/HYP PTE/PMD definitions
191 */
192#define PMD_HYP PMD_SECT_USER
193#define PTE_HYP PTE_USER
194
4f04d8f0 195/*
87366d8c 196 * Highest possible physical address supported.
4f04d8f0 197 */
87366d8c 198#define PHYS_MASK_SHIFT (48)
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199#define PHYS_MASK ((UL(1) << PHYS_MASK_SHIFT) - 1)
200
201/*
202 * TCR flags.
203 */
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204#define TCR_T0SZ_OFFSET 0
205#define TCR_T1SZ_OFFSET 16
206#define TCR_T0SZ(x) ((UL(64) - (x)) << TCR_T0SZ_OFFSET)
207#define TCR_T1SZ(x) ((UL(64) - (x)) << TCR_T1SZ_OFFSET)
208#define TCR_TxSZ(x) (TCR_T0SZ(x) | TCR_T1SZ(x))
209#define TCR_TxSZ_WIDTH 6
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210#define TCR_IRGN_NC ((UL(0) << 8) | (UL(0) << 24))
211#define TCR_IRGN_WBWA ((UL(1) << 8) | (UL(1) << 24))
212#define TCR_IRGN_WT ((UL(2) << 8) | (UL(2) << 24))
213#define TCR_IRGN_WBnWA ((UL(3) << 8) | (UL(3) << 24))
214#define TCR_IRGN_MASK ((UL(3) << 8) | (UL(3) << 24))
215#define TCR_ORGN_NC ((UL(0) << 10) | (UL(0) << 26))
216#define TCR_ORGN_WBWA ((UL(1) << 10) | (UL(1) << 26))
217#define TCR_ORGN_WT ((UL(2) << 10) | (UL(2) << 26))
218#define TCR_ORGN_WBnWA ((UL(3) << 10) | (UL(3) << 26))
219#define TCR_ORGN_MASK ((UL(3) << 10) | (UL(3) << 26))
220#define TCR_SHARED ((UL(3) << 12) | (UL(3) << 28))
35a86976 221#define TCR_TG0_4K (UL(0) << 14)
4f04d8f0 222#define TCR_TG0_64K (UL(1) << 14)
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223#define TCR_TG0_16K (UL(2) << 14)
224#define TCR_TG1_16K (UL(1) << 30)
225#define TCR_TG1_4K (UL(2) << 30)
226#define TCR_TG1_64K (UL(3) << 30)
4f04d8f0 227#define TCR_ASID16 (UL(1) << 36)
d50240a5 228#define TCR_TBI0 (UL(1) << 37)
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229#define TCR_HA (UL(1) << 39)
230#define TCR_HD (UL(1) << 40)
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231
232#endif