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 
19 #include <asm/memory.h>
20 
21 /*
22  * Number of page-table levels required to address 'va_bits' wide
23  * address, without section mapping. We resolve the top (va_bits - PAGE_SHIFT)
24  * bits with (PAGE_SHIFT - 3) bits at each page table level. Hence:
25  *
26  *  levels = DIV_ROUND_UP((va_bits - PAGE_SHIFT), (PAGE_SHIFT - 3))
27  *
28  * where DIV_ROUND_UP(n, d) => (((n) + (d) - 1) / (d))
29  *
30  * We cannot include linux/kernel.h which defines DIV_ROUND_UP here
31  * due to build issues. So we open code DIV_ROUND_UP here:
32  *
33  *	((((va_bits) - PAGE_SHIFT) + (PAGE_SHIFT - 3) - 1) / (PAGE_SHIFT - 3))
34  *
35  * which gets simplified as :
36  */
37 #define ARM64_HW_PGTABLE_LEVELS(va_bits) (((va_bits) - 4) / (PAGE_SHIFT - 3))
38 
39 /*
40  * Size mapped by an entry at level n ( 0 <= n <= 3)
41  * We map (PAGE_SHIFT - 3) at all translation levels and PAGE_SHIFT bits
42  * in the final page. The maximum number of translation levels supported by
43  * the architecture is 4. Hence, starting at at level n, we have further
44  * ((4 - n) - 1) levels of translation excluding the offset within the page.
45  * So, the total number of bits mapped by an entry at level n is :
46  *
47  *  ((4 - n) - 1) * (PAGE_SHIFT - 3) + PAGE_SHIFT
48  *
49  * Rearranging it a bit we get :
50  *   (4 - n) * (PAGE_SHIFT - 3) + 3
51  */
52 #define ARM64_HW_PGTABLE_LEVEL_SHIFT(n)	((PAGE_SHIFT - 3) * (4 - (n)) + 3)
53 
54 #define PTRS_PER_PTE		(1 << (PAGE_SHIFT - 3))
55 
56 /*
57  * PMD_SHIFT determines the size a level 2 page table entry can map.
58  */
59 #if CONFIG_PGTABLE_LEVELS > 2
60 #define PMD_SHIFT		ARM64_HW_PGTABLE_LEVEL_SHIFT(2)
61 #define PMD_SIZE		(_AC(1, UL) << PMD_SHIFT)
62 #define PMD_MASK		(~(PMD_SIZE-1))
63 #define PTRS_PER_PMD		PTRS_PER_PTE
64 #endif
65 
66 /*
67  * PUD_SHIFT determines the size a level 1 page table entry can map.
68  */
69 #if CONFIG_PGTABLE_LEVELS > 3
70 #define PUD_SHIFT		ARM64_HW_PGTABLE_LEVEL_SHIFT(1)
71 #define PUD_SIZE		(_AC(1, UL) << PUD_SHIFT)
72 #define PUD_MASK		(~(PUD_SIZE-1))
73 #define PTRS_PER_PUD		PTRS_PER_PTE
74 #endif
75 
76 /*
77  * PGDIR_SHIFT determines the size a top-level page table entry can map
78  * (depending on the configuration, this level can be 0, 1 or 2).
79  */
80 #define PGDIR_SHIFT		ARM64_HW_PGTABLE_LEVEL_SHIFT(4 - CONFIG_PGTABLE_LEVELS)
81 #define PGDIR_SIZE		(_AC(1, UL) << PGDIR_SHIFT)
82 #define PGDIR_MASK		(~(PGDIR_SIZE-1))
83 #define PTRS_PER_PGD		(1 << (MAX_USER_VA_BITS - PGDIR_SHIFT))
84 
85 /*
86  * Section address mask and size definitions.
87  */
88 #define SECTION_SHIFT		PMD_SHIFT
89 #define SECTION_SIZE		(_AC(1, UL) << SECTION_SHIFT)
90 #define SECTION_MASK		(~(SECTION_SIZE-1))
91 
92 /*
93  * Contiguous page definitions.
94  */
95 #ifdef CONFIG_ARM64_64K_PAGES
96 #define CONT_PTE_SHIFT		5
97 #define CONT_PMD_SHIFT		5
98 #elif defined(CONFIG_ARM64_16K_PAGES)
99 #define CONT_PTE_SHIFT		7
100 #define CONT_PMD_SHIFT		5
101 #else
102 #define CONT_PTE_SHIFT		4
103 #define CONT_PMD_SHIFT		4
104 #endif
105 
106 #define CONT_PTES		(1 << CONT_PTE_SHIFT)
107 #define CONT_PTE_SIZE		(CONT_PTES * PAGE_SIZE)
108 #define CONT_PTE_MASK		(~(CONT_PTE_SIZE - 1))
109 #define CONT_PMDS		(1 << CONT_PMD_SHIFT)
110 #define CONT_PMD_SIZE		(CONT_PMDS * PMD_SIZE)
111 #define CONT_PMD_MASK		(~(CONT_PMD_SIZE - 1))
112 /* the the numerical offset of the PTE within a range of CONT_PTES */
113 #define CONT_RANGE_OFFSET(addr) (((addr)>>PAGE_SHIFT)&(CONT_PTES-1))
114 
115 /*
116  * Hardware page table definitions.
117  *
118  * Level 1 descriptor (PUD).
119  */
120 #define PUD_TYPE_TABLE		(_AT(pudval_t, 3) << 0)
121 #define PUD_TABLE_BIT		(_AT(pudval_t, 1) << 1)
122 #define PUD_TYPE_MASK		(_AT(pudval_t, 3) << 0)
123 #define PUD_TYPE_SECT		(_AT(pudval_t, 1) << 0)
124 
125 /*
126  * Level 2 descriptor (PMD).
127  */
128 #define PMD_TYPE_MASK		(_AT(pmdval_t, 3) << 0)
129 #define PMD_TYPE_FAULT		(_AT(pmdval_t, 0) << 0)
130 #define PMD_TYPE_TABLE		(_AT(pmdval_t, 3) << 0)
131 #define PMD_TYPE_SECT		(_AT(pmdval_t, 1) << 0)
132 #define PMD_TABLE_BIT		(_AT(pmdval_t, 1) << 1)
133 
134 /*
135  * Section
136  */
137 #define PMD_SECT_VALID		(_AT(pmdval_t, 1) << 0)
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 
147 /*
148  * AttrIndx[2:0] encoding (mapping attributes defined in the MAIR* registers).
149  */
150 #define PMD_ATTRINDX(t)		(_AT(pmdval_t, (t)) << 2)
151 #define PMD_ATTRINDX_MASK	(_AT(pmdval_t, 7) << 2)
152 
153 /*
154  * Level 3 descriptor (PTE).
155  */
156 #define PTE_TYPE_MASK		(_AT(pteval_t, 3) << 0)
157 #define PTE_TYPE_FAULT		(_AT(pteval_t, 0) << 0)
158 #define PTE_TYPE_PAGE		(_AT(pteval_t, 3) << 0)
159 #define PTE_TABLE_BIT		(_AT(pteval_t, 1) << 1)
160 #define PTE_USER		(_AT(pteval_t, 1) << 6)		/* AP[1] */
161 #define PTE_RDONLY		(_AT(pteval_t, 1) << 7)		/* AP[2] */
162 #define PTE_SHARED		(_AT(pteval_t, 3) << 8)		/* SH[1:0], inner shareable */
163 #define PTE_AF			(_AT(pteval_t, 1) << 10)	/* Access Flag */
164 #define PTE_NG			(_AT(pteval_t, 1) << 11)	/* nG */
165 #define PTE_DBM			(_AT(pteval_t, 1) << 51)	/* Dirty Bit Management */
166 #define PTE_CONT		(_AT(pteval_t, 1) << 52)	/* Contiguous range */
167 #define PTE_PXN			(_AT(pteval_t, 1) << 53)	/* Privileged XN */
168 #define PTE_UXN			(_AT(pteval_t, 1) << 54)	/* User XN */
169 #define PTE_HYP_XN		(_AT(pteval_t, 1) << 54)	/* HYP XN */
170 
171 #define PTE_ADDR_LOW		(((_AT(pteval_t, 1) << (48 - PAGE_SHIFT)) - 1) << PAGE_SHIFT)
172 #ifdef CONFIG_ARM64_PA_BITS_52
173 #define PTE_ADDR_HIGH		(_AT(pteval_t, 0xf) << 12)
174 #define PTE_ADDR_MASK		(PTE_ADDR_LOW | PTE_ADDR_HIGH)
175 #else
176 #define PTE_ADDR_MASK		PTE_ADDR_LOW
177 #endif
178 
179 /*
180  * AttrIndx[2:0] encoding (mapping attributes defined in the MAIR* registers).
181  */
182 #define PTE_ATTRINDX(t)		(_AT(pteval_t, (t)) << 2)
183 #define PTE_ATTRINDX_MASK	(_AT(pteval_t, 7) << 2)
184 
185 /*
186  * 2nd stage PTE definitions
187  */
188 #define PTE_S2_RDONLY		(_AT(pteval_t, 1) << 6)   /* HAP[2:1] */
189 #define PTE_S2_RDWR		(_AT(pteval_t, 3) << 6)   /* HAP[2:1] */
190 #define PTE_S2_XN		(_AT(pteval_t, 2) << 53)  /* XN[1:0] */
191 
192 #define PMD_S2_RDONLY		(_AT(pmdval_t, 1) << 6)   /* HAP[2:1] */
193 #define PMD_S2_RDWR		(_AT(pmdval_t, 3) << 6)   /* HAP[2:1] */
194 #define PMD_S2_XN		(_AT(pmdval_t, 2) << 53)  /* XN[1:0] */
195 
196 #define PUD_S2_RDONLY		(_AT(pudval_t, 1) << 6)   /* HAP[2:1] */
197 #define PUD_S2_RDWR		(_AT(pudval_t, 3) << 6)   /* HAP[2:1] */
198 #define PUD_S2_XN		(_AT(pudval_t, 2) << 53)  /* XN[1:0] */
199 
200 /*
201  * Memory Attribute override for Stage-2 (MemAttr[3:0])
202  */
203 #define PTE_S2_MEMATTR(t)	(_AT(pteval_t, (t)) << 2)
204 #define PTE_S2_MEMATTR_MASK	(_AT(pteval_t, 0xf) << 2)
205 
206 /*
207  * EL2/HYP PTE/PMD definitions
208  */
209 #define PMD_HYP			PMD_SECT_USER
210 #define PTE_HYP			PTE_USER
211 
212 /*
213  * Highest possible physical address supported.
214  */
215 #define PHYS_MASK_SHIFT		(CONFIG_ARM64_PA_BITS)
216 #define PHYS_MASK		((UL(1) << PHYS_MASK_SHIFT) - 1)
217 
218 #define TTBR_CNP_BIT		(UL(1) << 0)
219 
220 /*
221  * TCR flags.
222  */
223 #define TCR_T0SZ_OFFSET		0
224 #define TCR_T1SZ_OFFSET		16
225 #define TCR_T0SZ(x)		((UL(64) - (x)) << TCR_T0SZ_OFFSET)
226 #define TCR_T1SZ(x)		((UL(64) - (x)) << TCR_T1SZ_OFFSET)
227 #define TCR_TxSZ(x)		(TCR_T0SZ(x) | TCR_T1SZ(x))
228 #define TCR_TxSZ_WIDTH		6
229 #define TCR_T0SZ_MASK		(((UL(1) << TCR_TxSZ_WIDTH) - 1) << TCR_T0SZ_OFFSET)
230 
231 #define TCR_EPD0_SHIFT		7
232 #define TCR_EPD0_MASK		(UL(1) << TCR_EPD0_SHIFT)
233 #define TCR_IRGN0_SHIFT		8
234 #define TCR_IRGN0_MASK		(UL(3) << TCR_IRGN0_SHIFT)
235 #define TCR_IRGN0_NC		(UL(0) << TCR_IRGN0_SHIFT)
236 #define TCR_IRGN0_WBWA		(UL(1) << TCR_IRGN0_SHIFT)
237 #define TCR_IRGN0_WT		(UL(2) << TCR_IRGN0_SHIFT)
238 #define TCR_IRGN0_WBnWA		(UL(3) << TCR_IRGN0_SHIFT)
239 
240 #define TCR_EPD1_SHIFT		23
241 #define TCR_EPD1_MASK		(UL(1) << TCR_EPD1_SHIFT)
242 #define TCR_IRGN1_SHIFT		24
243 #define TCR_IRGN1_MASK		(UL(3) << TCR_IRGN1_SHIFT)
244 #define TCR_IRGN1_NC		(UL(0) << TCR_IRGN1_SHIFT)
245 #define TCR_IRGN1_WBWA		(UL(1) << TCR_IRGN1_SHIFT)
246 #define TCR_IRGN1_WT		(UL(2) << TCR_IRGN1_SHIFT)
247 #define TCR_IRGN1_WBnWA		(UL(3) << TCR_IRGN1_SHIFT)
248 
249 #define TCR_IRGN_NC		(TCR_IRGN0_NC | TCR_IRGN1_NC)
250 #define TCR_IRGN_WBWA		(TCR_IRGN0_WBWA | TCR_IRGN1_WBWA)
251 #define TCR_IRGN_WT		(TCR_IRGN0_WT | TCR_IRGN1_WT)
252 #define TCR_IRGN_WBnWA		(TCR_IRGN0_WBnWA | TCR_IRGN1_WBnWA)
253 #define TCR_IRGN_MASK		(TCR_IRGN0_MASK | TCR_IRGN1_MASK)
254 
255 
256 #define TCR_ORGN0_SHIFT		10
257 #define TCR_ORGN0_MASK		(UL(3) << TCR_ORGN0_SHIFT)
258 #define TCR_ORGN0_NC		(UL(0) << TCR_ORGN0_SHIFT)
259 #define TCR_ORGN0_WBWA		(UL(1) << TCR_ORGN0_SHIFT)
260 #define TCR_ORGN0_WT		(UL(2) << TCR_ORGN0_SHIFT)
261 #define TCR_ORGN0_WBnWA		(UL(3) << TCR_ORGN0_SHIFT)
262 
263 #define TCR_ORGN1_SHIFT		26
264 #define TCR_ORGN1_MASK		(UL(3) << TCR_ORGN1_SHIFT)
265 #define TCR_ORGN1_NC		(UL(0) << TCR_ORGN1_SHIFT)
266 #define TCR_ORGN1_WBWA		(UL(1) << TCR_ORGN1_SHIFT)
267 #define TCR_ORGN1_WT		(UL(2) << TCR_ORGN1_SHIFT)
268 #define TCR_ORGN1_WBnWA		(UL(3) << TCR_ORGN1_SHIFT)
269 
270 #define TCR_ORGN_NC		(TCR_ORGN0_NC | TCR_ORGN1_NC)
271 #define TCR_ORGN_WBWA		(TCR_ORGN0_WBWA | TCR_ORGN1_WBWA)
272 #define TCR_ORGN_WT		(TCR_ORGN0_WT | TCR_ORGN1_WT)
273 #define TCR_ORGN_WBnWA		(TCR_ORGN0_WBnWA | TCR_ORGN1_WBnWA)
274 #define TCR_ORGN_MASK		(TCR_ORGN0_MASK | TCR_ORGN1_MASK)
275 
276 #define TCR_SH0_SHIFT		12
277 #define TCR_SH0_MASK		(UL(3) << TCR_SH0_SHIFT)
278 #define TCR_SH0_INNER		(UL(3) << TCR_SH0_SHIFT)
279 
280 #define TCR_SH1_SHIFT		28
281 #define TCR_SH1_MASK		(UL(3) << TCR_SH1_SHIFT)
282 #define TCR_SH1_INNER		(UL(3) << TCR_SH1_SHIFT)
283 #define TCR_SHARED		(TCR_SH0_INNER | TCR_SH1_INNER)
284 
285 #define TCR_TG0_SHIFT		14
286 #define TCR_TG0_MASK		(UL(3) << TCR_TG0_SHIFT)
287 #define TCR_TG0_4K		(UL(0) << TCR_TG0_SHIFT)
288 #define TCR_TG0_64K		(UL(1) << TCR_TG0_SHIFT)
289 #define TCR_TG0_16K		(UL(2) << TCR_TG0_SHIFT)
290 
291 #define TCR_TG1_SHIFT		30
292 #define TCR_TG1_MASK		(UL(3) << TCR_TG1_SHIFT)
293 #define TCR_TG1_16K		(UL(1) << TCR_TG1_SHIFT)
294 #define TCR_TG1_4K		(UL(2) << TCR_TG1_SHIFT)
295 #define TCR_TG1_64K		(UL(3) << TCR_TG1_SHIFT)
296 
297 #define TCR_IPS_SHIFT		32
298 #define TCR_IPS_MASK		(UL(7) << TCR_IPS_SHIFT)
299 #define TCR_A1			(UL(1) << 22)
300 #define TCR_ASID16		(UL(1) << 36)
301 #define TCR_TBI0		(UL(1) << 37)
302 #define TCR_TBI1		(UL(1) << 38)
303 #define TCR_HA			(UL(1) << 39)
304 #define TCR_HD			(UL(1) << 40)
305 #define TCR_NFD0		(UL(1) << 53)
306 #define TCR_NFD1		(UL(1) << 54)
307 
308 /*
309  * TTBR.
310  */
311 #ifdef CONFIG_ARM64_PA_BITS_52
312 /*
313  * This should be GENMASK_ULL(47, 2).
314  * TTBR_ELx[1] is RES0 in this configuration.
315  */
316 #define TTBR_BADDR_MASK_52	(((UL(1) << 46) - 1) << 2)
317 #endif
318 
319 #ifdef CONFIG_ARM64_USER_VA_BITS_52
320 /* Must be at least 64-byte aligned to prevent corruption of the TTBR */
321 #define TTBR1_BADDR_4852_OFFSET	(((UL(1) << (52 - PGDIR_SHIFT)) - \
322 				 (UL(1) << (48 - PGDIR_SHIFT))) * 8)
323 #endif
324 
325 #endif
326