1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Copyright (C) 2012 ARM Ltd.
4  */
5 #ifndef __ASM_PGTABLE_HWDEF_H
6 #define __ASM_PGTABLE_HWDEF_H
7 
8 #include <asm/memory.h>
9 
10 /*
11  * Number of page-table levels required to address 'va_bits' wide
12  * address, without section mapping. We resolve the top (va_bits - PAGE_SHIFT)
13  * bits with (PAGE_SHIFT - 3) bits at each page table level. Hence:
14  *
15  *  levels = DIV_ROUND_UP((va_bits - PAGE_SHIFT), (PAGE_SHIFT - 3))
16  *
17  * where DIV_ROUND_UP(n, d) => (((n) + (d) - 1) / (d))
18  *
19  * We cannot include linux/kernel.h which defines DIV_ROUND_UP here
20  * due to build issues. So we open code DIV_ROUND_UP here:
21  *
22  *	((((va_bits) - PAGE_SHIFT) + (PAGE_SHIFT - 3) - 1) / (PAGE_SHIFT - 3))
23  *
24  * which gets simplified as :
25  */
26 #define ARM64_HW_PGTABLE_LEVELS(va_bits) (((va_bits) - 4) / (PAGE_SHIFT - 3))
27 
28 /*
29  * Size mapped by an entry at level n ( -1 <= n <= 3)
30  * We map (PAGE_SHIFT - 3) at all translation levels and PAGE_SHIFT bits
31  * in the final page. The maximum number of translation levels supported by
32  * the architecture is 5. Hence, starting at level n, we have further
33  * ((4 - n) - 1) levels of translation excluding the offset within the page.
34  * So, the total number of bits mapped by an entry at level n is :
35  *
36  *  ((4 - n) - 1) * (PAGE_SHIFT - 3) + PAGE_SHIFT
37  *
38  * Rearranging it a bit we get :
39  *   (4 - n) * (PAGE_SHIFT - 3) + 3
40  */
41 #define ARM64_HW_PGTABLE_LEVEL_SHIFT(n)	((PAGE_SHIFT - 3) * (4 - (n)) + 3)
42 
43 #define PTRS_PER_PTE		(1 << (PAGE_SHIFT - 3))
44 
45 /*
46  * PMD_SHIFT determines the size a level 2 page table entry can map.
47  */
48 #if CONFIG_PGTABLE_LEVELS > 2
49 #define PMD_SHIFT		ARM64_HW_PGTABLE_LEVEL_SHIFT(2)
50 #define PMD_SIZE		(_AC(1, UL) << PMD_SHIFT)
51 #define PMD_MASK		(~(PMD_SIZE-1))
52 #define PTRS_PER_PMD		(1 << (PAGE_SHIFT - 3))
53 #endif
54 
55 /*
56  * PUD_SHIFT determines the size a level 1 page table entry can map.
57  */
58 #if CONFIG_PGTABLE_LEVELS > 3
59 #define PUD_SHIFT		ARM64_HW_PGTABLE_LEVEL_SHIFT(1)
60 #define PUD_SIZE		(_AC(1, UL) << PUD_SHIFT)
61 #define PUD_MASK		(~(PUD_SIZE-1))
62 #define PTRS_PER_PUD		(1 << (PAGE_SHIFT - 3))
63 #endif
64 
65 #if CONFIG_PGTABLE_LEVELS > 4
66 #define P4D_SHIFT		ARM64_HW_PGTABLE_LEVEL_SHIFT(0)
67 #define P4D_SIZE		(_AC(1, UL) << P4D_SHIFT)
68 #define P4D_MASK		(~(P4D_SIZE-1))
69 #define PTRS_PER_P4D		(1 << (PAGE_SHIFT - 3))
70 #endif
71 
72 /*
73  * PGDIR_SHIFT determines the size a top-level page table entry can map
74  * (depending on the configuration, this level can be -1, 0, 1 or 2).
75  */
76 #define PGDIR_SHIFT		ARM64_HW_PGTABLE_LEVEL_SHIFT(4 - CONFIG_PGTABLE_LEVELS)
77 #define PGDIR_SIZE		(_AC(1, UL) << PGDIR_SHIFT)
78 #define PGDIR_MASK		(~(PGDIR_SIZE-1))
79 #define PTRS_PER_PGD		(1 << (VA_BITS - PGDIR_SHIFT))
80 
81 /*
82  * Contiguous page definitions.
83  */
84 #define CONT_PTE_SHIFT		(CONFIG_ARM64_CONT_PTE_SHIFT + PAGE_SHIFT)
85 #define CONT_PTES		(1 << (CONT_PTE_SHIFT - PAGE_SHIFT))
86 #define CONT_PTE_SIZE		(CONT_PTES * PAGE_SIZE)
87 #define CONT_PTE_MASK		(~(CONT_PTE_SIZE - 1))
88 
89 #define CONT_PMD_SHIFT		(CONFIG_ARM64_CONT_PMD_SHIFT + PMD_SHIFT)
90 #define CONT_PMDS		(1 << (CONT_PMD_SHIFT - PMD_SHIFT))
91 #define CONT_PMD_SIZE		(CONT_PMDS * PMD_SIZE)
92 #define CONT_PMD_MASK		(~(CONT_PMD_SIZE - 1))
93 
94 /*
95  * Hardware page table definitions.
96  *
97  * Level -1 descriptor (PGD).
98  */
99 #define PGD_TYPE_TABLE		(_AT(pgdval_t, 3) << 0)
100 #define PGD_TABLE_BIT		(_AT(pgdval_t, 1) << 1)
101 #define PGD_TYPE_MASK		(_AT(pgdval_t, 3) << 0)
102 #define PGD_TABLE_PXN		(_AT(pgdval_t, 1) << 59)
103 #define PGD_TABLE_UXN		(_AT(pgdval_t, 1) << 60)
104 
105 /*
106  * Level 0 descriptor (P4D).
107  */
108 #define P4D_TYPE_TABLE		(_AT(p4dval_t, 3) << 0)
109 #define P4D_TABLE_BIT		(_AT(p4dval_t, 1) << 1)
110 #define P4D_TYPE_MASK		(_AT(p4dval_t, 3) << 0)
111 #define P4D_TYPE_SECT		(_AT(p4dval_t, 1) << 0)
112 #define P4D_SECT_RDONLY		(_AT(p4dval_t, 1) << 7)		/* AP[2] */
113 #define P4D_TABLE_PXN		(_AT(p4dval_t, 1) << 59)
114 #define P4D_TABLE_UXN		(_AT(p4dval_t, 1) << 60)
115 
116 /*
117  * Level 1 descriptor (PUD).
118  */
119 #define PUD_TYPE_TABLE		(_AT(pudval_t, 3) << 0)
120 #define PUD_TABLE_BIT		(_AT(pudval_t, 1) << 1)
121 #define PUD_TYPE_MASK		(_AT(pudval_t, 3) << 0)
122 #define PUD_TYPE_SECT		(_AT(pudval_t, 1) << 0)
123 #define PUD_SECT_RDONLY		(_AT(pudval_t, 1) << 7)		/* AP[2] */
124 #define PUD_TABLE_PXN		(_AT(pudval_t, 1) << 59)
125 #define PUD_TABLE_UXN		(_AT(pudval_t, 1) << 60)
126 
127 /*
128  * Level 2 descriptor (PMD).
129  */
130 #define PMD_TYPE_MASK		(_AT(pmdval_t, 3) << 0)
131 #define PMD_TYPE_TABLE		(_AT(pmdval_t, 3) << 0)
132 #define PMD_TYPE_SECT		(_AT(pmdval_t, 1) << 0)
133 #define PMD_TABLE_BIT		(_AT(pmdval_t, 1) << 1)
134 
135 /*
136  * Section
137  */
138 #define PMD_SECT_USER		(_AT(pmdval_t, 1) << 6)		/* AP[1] */
139 #define PMD_SECT_RDONLY		(_AT(pmdval_t, 1) << 7)		/* AP[2] */
140 #define PMD_SECT_S		(_AT(pmdval_t, 3) << 8)
141 #define PMD_SECT_AF		(_AT(pmdval_t, 1) << 10)
142 #define PMD_SECT_NG		(_AT(pmdval_t, 1) << 11)
143 #define PMD_SECT_CONT		(_AT(pmdval_t, 1) << 52)
144 #define PMD_SECT_PXN		(_AT(pmdval_t, 1) << 53)
145 #define PMD_SECT_UXN		(_AT(pmdval_t, 1) << 54)
146 #define PMD_TABLE_PXN		(_AT(pmdval_t, 1) << 59)
147 #define PMD_TABLE_UXN		(_AT(pmdval_t, 1) << 60)
148 
149 /*
150  * AttrIndx[2:0] encoding (mapping attributes defined in the MAIR* registers).
151  */
152 #define PMD_ATTRINDX(t)		(_AT(pmdval_t, (t)) << 2)
153 #define PMD_ATTRINDX_MASK	(_AT(pmdval_t, 7) << 2)
154 
155 /*
156  * Level 3 descriptor (PTE).
157  */
158 #define PTE_VALID		(_AT(pteval_t, 1) << 0)
159 #define PTE_TYPE_MASK		(_AT(pteval_t, 3) << 0)
160 #define PTE_TYPE_PAGE		(_AT(pteval_t, 3) << 0)
161 #define PTE_TABLE_BIT		(_AT(pteval_t, 1) << 1)
162 #define PTE_USER		(_AT(pteval_t, 1) << 6)		/* AP[1] */
163 #define PTE_RDONLY		(_AT(pteval_t, 1) << 7)		/* AP[2] */
164 #define PTE_SHARED		(_AT(pteval_t, 3) << 8)		/* SH[1:0], inner shareable */
165 #define PTE_AF			(_AT(pteval_t, 1) << 10)	/* Access Flag */
166 #define PTE_NG			(_AT(pteval_t, 1) << 11)	/* nG */
167 #define PTE_GP			(_AT(pteval_t, 1) << 50)	/* BTI guarded */
168 #define PTE_DBM			(_AT(pteval_t, 1) << 51)	/* Dirty Bit Management */
169 #define PTE_CONT		(_AT(pteval_t, 1) << 52)	/* Contiguous range */
170 #define PTE_PXN			(_AT(pteval_t, 1) << 53)	/* Privileged XN */
171 #define PTE_UXN			(_AT(pteval_t, 1) << 54)	/* User XN */
172 #define PTE_SWBITS_MASK		_AT(pteval_t, (BIT(63) | GENMASK(58, 55)))
173 
174 #define PTE_ADDR_LOW		(((_AT(pteval_t, 1) << (50 - PAGE_SHIFT)) - 1) << PAGE_SHIFT)
175 #ifdef CONFIG_ARM64_PA_BITS_52
176 #ifdef CONFIG_ARM64_64K_PAGES
177 #define PTE_ADDR_HIGH		(_AT(pteval_t, 0xf) << 12)
178 #define PTE_ADDR_HIGH_SHIFT	36
179 #define PHYS_TO_PTE_ADDR_MASK	(PTE_ADDR_LOW | PTE_ADDR_HIGH)
180 #else
181 #define PTE_ADDR_HIGH		(_AT(pteval_t, 0x3) << 8)
182 #define PTE_ADDR_HIGH_SHIFT	42
183 #define PHYS_TO_PTE_ADDR_MASK	GENMASK_ULL(49, 8)
184 #endif
185 #endif
186 
187 /*
188  * AttrIndx[2:0] encoding (mapping attributes defined in the MAIR* registers).
189  */
190 #define PTE_ATTRINDX(t)		(_AT(pteval_t, (t)) << 2)
191 #define PTE_ATTRINDX_MASK	(_AT(pteval_t, 7) << 2)
192 
193 /*
194  * PIIndex[3:0] encoding (Permission Indirection Extension)
195  */
196 #define PTE_PI_IDX_0	6	/* AP[1], USER */
197 #define PTE_PI_IDX_1	51	/* DBM */
198 #define PTE_PI_IDX_2	53	/* PXN */
199 #define PTE_PI_IDX_3	54	/* UXN */
200 
201 /*
202  * POIndex[2:0] encoding (Permission Overlay Extension)
203  */
204 #define PTE_PO_IDX_0	(_AT(pteval_t, 1) << 60)
205 #define PTE_PO_IDX_1	(_AT(pteval_t, 1) << 61)
206 #define PTE_PO_IDX_2	(_AT(pteval_t, 1) << 62)
207 
208 #define PTE_PO_IDX_MASK		GENMASK_ULL(62, 60)
209 
210 
211 /*
212  * Memory Attribute override for Stage-2 (MemAttr[3:0])
213  */
214 #define PTE_S2_MEMATTR(t)	(_AT(pteval_t, (t)) << 2)
215 
216 /*
217  * Hierarchical permission for Stage-1 tables
218  */
219 #define S1_TABLE_AP		(_AT(pmdval_t, 3) << 61)
220 
221 /*
222  * Highest possible physical address supported.
223  */
224 #define PHYS_MASK_SHIFT		(CONFIG_ARM64_PA_BITS)
225 #define PHYS_MASK		((UL(1) << PHYS_MASK_SHIFT) - 1)
226 
227 #define TTBR_CNP_BIT		(UL(1) << 0)
228 
229 /*
230  * TCR flags.
231  */
232 #define TCR_T0SZ_OFFSET		0
233 #define TCR_T1SZ_OFFSET		16
234 #define TCR_T0SZ(x)		((UL(64) - (x)) << TCR_T0SZ_OFFSET)
235 #define TCR_T1SZ(x)		((UL(64) - (x)) << TCR_T1SZ_OFFSET)
236 #define TCR_TxSZ(x)		(TCR_T0SZ(x) | TCR_T1SZ(x))
237 #define TCR_TxSZ_WIDTH		6
238 #define TCR_T0SZ_MASK		(((UL(1) << TCR_TxSZ_WIDTH) - 1) << TCR_T0SZ_OFFSET)
239 #define TCR_T1SZ_MASK		(((UL(1) << TCR_TxSZ_WIDTH) - 1) << TCR_T1SZ_OFFSET)
240 
241 #define TCR_EPD0_SHIFT		7
242 #define TCR_EPD0_MASK		(UL(1) << TCR_EPD0_SHIFT)
243 #define TCR_IRGN0_SHIFT		8
244 #define TCR_IRGN0_MASK		(UL(3) << TCR_IRGN0_SHIFT)
245 #define TCR_IRGN0_NC		(UL(0) << TCR_IRGN0_SHIFT)
246 #define TCR_IRGN0_WBWA		(UL(1) << TCR_IRGN0_SHIFT)
247 #define TCR_IRGN0_WT		(UL(2) << TCR_IRGN0_SHIFT)
248 #define TCR_IRGN0_WBnWA		(UL(3) << TCR_IRGN0_SHIFT)
249 
250 #define TCR_EPD1_SHIFT		23
251 #define TCR_EPD1_MASK		(UL(1) << TCR_EPD1_SHIFT)
252 #define TCR_IRGN1_SHIFT		24
253 #define TCR_IRGN1_MASK		(UL(3) << TCR_IRGN1_SHIFT)
254 #define TCR_IRGN1_NC		(UL(0) << TCR_IRGN1_SHIFT)
255 #define TCR_IRGN1_WBWA		(UL(1) << TCR_IRGN1_SHIFT)
256 #define TCR_IRGN1_WT		(UL(2) << TCR_IRGN1_SHIFT)
257 #define TCR_IRGN1_WBnWA		(UL(3) << TCR_IRGN1_SHIFT)
258 
259 #define TCR_IRGN_NC		(TCR_IRGN0_NC | TCR_IRGN1_NC)
260 #define TCR_IRGN_WBWA		(TCR_IRGN0_WBWA | TCR_IRGN1_WBWA)
261 #define TCR_IRGN_WT		(TCR_IRGN0_WT | TCR_IRGN1_WT)
262 #define TCR_IRGN_WBnWA		(TCR_IRGN0_WBnWA | TCR_IRGN1_WBnWA)
263 #define TCR_IRGN_MASK		(TCR_IRGN0_MASK | TCR_IRGN1_MASK)
264 
265 
266 #define TCR_ORGN0_SHIFT		10
267 #define TCR_ORGN0_MASK		(UL(3) << TCR_ORGN0_SHIFT)
268 #define TCR_ORGN0_NC		(UL(0) << TCR_ORGN0_SHIFT)
269 #define TCR_ORGN0_WBWA		(UL(1) << TCR_ORGN0_SHIFT)
270 #define TCR_ORGN0_WT		(UL(2) << TCR_ORGN0_SHIFT)
271 #define TCR_ORGN0_WBnWA		(UL(3) << TCR_ORGN0_SHIFT)
272 
273 #define TCR_ORGN1_SHIFT		26
274 #define TCR_ORGN1_MASK		(UL(3) << TCR_ORGN1_SHIFT)
275 #define TCR_ORGN1_NC		(UL(0) << TCR_ORGN1_SHIFT)
276 #define TCR_ORGN1_WBWA		(UL(1) << TCR_ORGN1_SHIFT)
277 #define TCR_ORGN1_WT		(UL(2) << TCR_ORGN1_SHIFT)
278 #define TCR_ORGN1_WBnWA		(UL(3) << TCR_ORGN1_SHIFT)
279 
280 #define TCR_ORGN_NC		(TCR_ORGN0_NC | TCR_ORGN1_NC)
281 #define TCR_ORGN_WBWA		(TCR_ORGN0_WBWA | TCR_ORGN1_WBWA)
282 #define TCR_ORGN_WT		(TCR_ORGN0_WT | TCR_ORGN1_WT)
283 #define TCR_ORGN_WBnWA		(TCR_ORGN0_WBnWA | TCR_ORGN1_WBnWA)
284 #define TCR_ORGN_MASK		(TCR_ORGN0_MASK | TCR_ORGN1_MASK)
285 
286 #define TCR_SH0_SHIFT		12
287 #define TCR_SH0_MASK		(UL(3) << TCR_SH0_SHIFT)
288 #define TCR_SH0_INNER		(UL(3) << TCR_SH0_SHIFT)
289 
290 #define TCR_SH1_SHIFT		28
291 #define TCR_SH1_MASK		(UL(3) << TCR_SH1_SHIFT)
292 #define TCR_SH1_INNER		(UL(3) << TCR_SH1_SHIFT)
293 #define TCR_SHARED		(TCR_SH0_INNER | TCR_SH1_INNER)
294 
295 #define TCR_TG0_SHIFT		14
296 #define TCR_TG0_MASK		(UL(3) << TCR_TG0_SHIFT)
297 #define TCR_TG0_4K		(UL(0) << TCR_TG0_SHIFT)
298 #define TCR_TG0_64K		(UL(1) << TCR_TG0_SHIFT)
299 #define TCR_TG0_16K		(UL(2) << TCR_TG0_SHIFT)
300 
301 #define TCR_TG1_SHIFT		30
302 #define TCR_TG1_MASK		(UL(3) << TCR_TG1_SHIFT)
303 #define TCR_TG1_16K		(UL(1) << TCR_TG1_SHIFT)
304 #define TCR_TG1_4K		(UL(2) << TCR_TG1_SHIFT)
305 #define TCR_TG1_64K		(UL(3) << TCR_TG1_SHIFT)
306 
307 #define TCR_IPS_SHIFT		32
308 #define TCR_IPS_MASK		(UL(7) << TCR_IPS_SHIFT)
309 #define TCR_A1			(UL(1) << 22)
310 #define TCR_ASID16		(UL(1) << 36)
311 #define TCR_TBI0		(UL(1) << 37)
312 #define TCR_TBI1		(UL(1) << 38)
313 #define TCR_HA			(UL(1) << 39)
314 #define TCR_HD			(UL(1) << 40)
315 #define TCR_HPD0_SHIFT		41
316 #define TCR_HPD0		(UL(1) << TCR_HPD0_SHIFT)
317 #define TCR_HPD1_SHIFT		42
318 #define TCR_HPD1		(UL(1) << TCR_HPD1_SHIFT)
319 #define TCR_TBID0		(UL(1) << 51)
320 #define TCR_TBID1		(UL(1) << 52)
321 #define TCR_NFD0		(UL(1) << 53)
322 #define TCR_NFD1		(UL(1) << 54)
323 #define TCR_E0PD0		(UL(1) << 55)
324 #define TCR_E0PD1		(UL(1) << 56)
325 #define TCR_TCMA0		(UL(1) << 57)
326 #define TCR_TCMA1		(UL(1) << 58)
327 #define TCR_DS			(UL(1) << 59)
328 
329 /*
330  * TTBR.
331  */
332 #ifdef CONFIG_ARM64_PA_BITS_52
333 /*
334  * TTBR_ELx[1] is RES0 in this configuration.
335  */
336 #define TTBR_BADDR_MASK_52	GENMASK_ULL(47, 2)
337 #endif
338 
339 #ifdef CONFIG_ARM64_VA_BITS_52
340 /* Must be at least 64-byte aligned to prevent corruption of the TTBR */
341 #define TTBR1_BADDR_4852_OFFSET	(((UL(1) << (52 - PGDIR_SHIFT)) - \
342 				 (UL(1) << (48 - PGDIR_SHIFT))) * 8)
343 #endif
344 
345 #endif
346