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 ( 0 <= 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 4. Hence, starting at 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		PTRS_PER_PTE
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		PTRS_PER_PTE
63 #endif
64 
65 /*
66  * PGDIR_SHIFT determines the size a top-level page table entry can map
67  * (depending on the configuration, this level can be 0, 1 or 2).
68  */
69 #define PGDIR_SHIFT		ARM64_HW_PGTABLE_LEVEL_SHIFT(4 - CONFIG_PGTABLE_LEVELS)
70 #define PGDIR_SIZE		(_AC(1, UL) << PGDIR_SHIFT)
71 #define PGDIR_MASK		(~(PGDIR_SIZE-1))
72 #define PTRS_PER_PGD		(1 << (VA_BITS - PGDIR_SHIFT))
73 
74 /*
75  * Section address mask and size definitions.
76  */
77 #define SECTION_SHIFT		PMD_SHIFT
78 #define SECTION_SIZE		(_AC(1, UL) << SECTION_SHIFT)
79 #define SECTION_MASK		(~(SECTION_SIZE-1))
80 
81 /*
82  * Contiguous page definitions.
83  */
84 #ifdef CONFIG_ARM64_64K_PAGES
85 #define CONT_PTE_SHIFT		5
86 #define CONT_PMD_SHIFT		5
87 #elif defined(CONFIG_ARM64_16K_PAGES)
88 #define CONT_PTE_SHIFT		7
89 #define CONT_PMD_SHIFT		5
90 #else
91 #define CONT_PTE_SHIFT		4
92 #define CONT_PMD_SHIFT		4
93 #endif
94 
95 #define CONT_PTES		(1 << CONT_PTE_SHIFT)
96 #define CONT_PTE_SIZE		(CONT_PTES * PAGE_SIZE)
97 #define CONT_PTE_MASK		(~(CONT_PTE_SIZE - 1))
98 #define CONT_PMDS		(1 << CONT_PMD_SHIFT)
99 #define CONT_PMD_SIZE		(CONT_PMDS * PMD_SIZE)
100 #define CONT_PMD_MASK		(~(CONT_PMD_SIZE - 1))
101 /* the the numerical offset of the PTE within a range of CONT_PTES */
102 #define CONT_RANGE_OFFSET(addr) (((addr)>>PAGE_SHIFT)&(CONT_PTES-1))
103 
104 /*
105  * Hardware page table definitions.
106  *
107  * Level 1 descriptor (PUD).
108  */
109 #define PUD_TYPE_TABLE		(_AT(pudval_t, 3) << 0)
110 #define PUD_TABLE_BIT		(_AT(pudval_t, 1) << 1)
111 #define PUD_TYPE_MASK		(_AT(pudval_t, 3) << 0)
112 #define PUD_TYPE_SECT		(_AT(pudval_t, 1) << 0)
113 #define PUD_SECT_RDONLY		(_AT(pudval_t, 1) << 7)		/* AP[2] */
114 
115 /*
116  * Level 2 descriptor (PMD).
117  */
118 #define PMD_TYPE_MASK		(_AT(pmdval_t, 3) << 0)
119 #define PMD_TYPE_TABLE		(_AT(pmdval_t, 3) << 0)
120 #define PMD_TYPE_SECT		(_AT(pmdval_t, 1) << 0)
121 #define PMD_TABLE_BIT		(_AT(pmdval_t, 1) << 1)
122 
123 /*
124  * Section
125  */
126 #define PMD_SECT_VALID		(_AT(pmdval_t, 1) << 0)
127 #define PMD_SECT_USER		(_AT(pmdval_t, 1) << 6)		/* AP[1] */
128 #define PMD_SECT_RDONLY		(_AT(pmdval_t, 1) << 7)		/* AP[2] */
129 #define PMD_SECT_S		(_AT(pmdval_t, 3) << 8)
130 #define PMD_SECT_AF		(_AT(pmdval_t, 1) << 10)
131 #define PMD_SECT_NG		(_AT(pmdval_t, 1) << 11)
132 #define PMD_SECT_CONT		(_AT(pmdval_t, 1) << 52)
133 #define PMD_SECT_PXN		(_AT(pmdval_t, 1) << 53)
134 #define PMD_SECT_UXN		(_AT(pmdval_t, 1) << 54)
135 
136 /*
137  * AttrIndx[2:0] encoding (mapping attributes defined in the MAIR* registers).
138  */
139 #define PMD_ATTRINDX(t)		(_AT(pmdval_t, (t)) << 2)
140 #define PMD_ATTRINDX_MASK	(_AT(pmdval_t, 7) << 2)
141 
142 /*
143  * Level 3 descriptor (PTE).
144  */
145 #define PTE_VALID		(_AT(pteval_t, 1) << 0)
146 #define PTE_TYPE_MASK		(_AT(pteval_t, 3) << 0)
147 #define PTE_TYPE_PAGE		(_AT(pteval_t, 3) << 0)
148 #define PTE_TABLE_BIT		(_AT(pteval_t, 1) << 1)
149 #define PTE_USER		(_AT(pteval_t, 1) << 6)		/* AP[1] */
150 #define PTE_RDONLY		(_AT(pteval_t, 1) << 7)		/* AP[2] */
151 #define PTE_SHARED		(_AT(pteval_t, 3) << 8)		/* SH[1:0], inner shareable */
152 #define PTE_AF			(_AT(pteval_t, 1) << 10)	/* Access Flag */
153 #define PTE_NG			(_AT(pteval_t, 1) << 11)	/* nG */
154 #define PTE_GP			(_AT(pteval_t, 1) << 50)	/* BTI guarded */
155 #define PTE_DBM			(_AT(pteval_t, 1) << 51)	/* Dirty Bit Management */
156 #define PTE_CONT		(_AT(pteval_t, 1) << 52)	/* Contiguous range */
157 #define PTE_PXN			(_AT(pteval_t, 1) << 53)	/* Privileged XN */
158 #define PTE_UXN			(_AT(pteval_t, 1) << 54)	/* User XN */
159 #define PTE_HYP_XN		(_AT(pteval_t, 1) << 54)	/* HYP XN */
160 
161 #define PTE_ADDR_LOW		(((_AT(pteval_t, 1) << (48 - PAGE_SHIFT)) - 1) << PAGE_SHIFT)
162 #ifdef CONFIG_ARM64_PA_BITS_52
163 #define PTE_ADDR_HIGH		(_AT(pteval_t, 0xf) << 12)
164 #define PTE_ADDR_MASK		(PTE_ADDR_LOW | PTE_ADDR_HIGH)
165 #else
166 #define PTE_ADDR_MASK		PTE_ADDR_LOW
167 #endif
168 
169 /*
170  * AttrIndx[2:0] encoding (mapping attributes defined in the MAIR* registers).
171  */
172 #define PTE_ATTRINDX(t)		(_AT(pteval_t, (t)) << 2)
173 #define PTE_ATTRINDX_MASK	(_AT(pteval_t, 7) << 2)
174 
175 /*
176  * 2nd stage PTE definitions
177  */
178 #define PTE_S2_RDONLY		(_AT(pteval_t, 1) << 6)   /* HAP[2:1] */
179 #define PTE_S2_RDWR		(_AT(pteval_t, 3) << 6)   /* HAP[2:1] */
180 #define PTE_S2_XN		(_AT(pteval_t, 2) << 53)  /* XN[1:0] */
181 
182 #define PMD_S2_RDONLY		(_AT(pmdval_t, 1) << 6)   /* HAP[2:1] */
183 #define PMD_S2_RDWR		(_AT(pmdval_t, 3) << 6)   /* HAP[2:1] */
184 #define PMD_S2_XN		(_AT(pmdval_t, 2) << 53)  /* XN[1:0] */
185 
186 #define PUD_S2_RDONLY		(_AT(pudval_t, 1) << 6)   /* HAP[2:1] */
187 #define PUD_S2_RDWR		(_AT(pudval_t, 3) << 6)   /* HAP[2:1] */
188 #define PUD_S2_XN		(_AT(pudval_t, 2) << 53)  /* XN[1:0] */
189 
190 /*
191  * Memory Attribute override for Stage-2 (MemAttr[3:0])
192  */
193 #define PTE_S2_MEMATTR(t)	(_AT(pteval_t, (t)) << 2)
194 
195 /*
196  * EL2/HYP PTE/PMD definitions
197  */
198 #define PMD_HYP			PMD_SECT_USER
199 #define PTE_HYP			PTE_USER
200 
201 /*
202  * Highest possible physical address supported.
203  */
204 #define PHYS_MASK_SHIFT		(CONFIG_ARM64_PA_BITS)
205 #define PHYS_MASK		((UL(1) << PHYS_MASK_SHIFT) - 1)
206 
207 #define TTBR_CNP_BIT		(UL(1) << 0)
208 
209 /*
210  * TCR flags.
211  */
212 #define TCR_T0SZ_OFFSET		0
213 #define TCR_T1SZ_OFFSET		16
214 #define TCR_T0SZ(x)		((UL(64) - (x)) << TCR_T0SZ_OFFSET)
215 #define TCR_T1SZ(x)		((UL(64) - (x)) << TCR_T1SZ_OFFSET)
216 #define TCR_TxSZ(x)		(TCR_T0SZ(x) | TCR_T1SZ(x))
217 #define TCR_TxSZ_WIDTH		6
218 #define TCR_T0SZ_MASK		(((UL(1) << TCR_TxSZ_WIDTH) - 1) << TCR_T0SZ_OFFSET)
219 
220 #define TCR_EPD0_SHIFT		7
221 #define TCR_EPD0_MASK		(UL(1) << TCR_EPD0_SHIFT)
222 #define TCR_IRGN0_SHIFT		8
223 #define TCR_IRGN0_MASK		(UL(3) << TCR_IRGN0_SHIFT)
224 #define TCR_IRGN0_NC		(UL(0) << TCR_IRGN0_SHIFT)
225 #define TCR_IRGN0_WBWA		(UL(1) << TCR_IRGN0_SHIFT)
226 #define TCR_IRGN0_WT		(UL(2) << TCR_IRGN0_SHIFT)
227 #define TCR_IRGN0_WBnWA		(UL(3) << TCR_IRGN0_SHIFT)
228 
229 #define TCR_EPD1_SHIFT		23
230 #define TCR_EPD1_MASK		(UL(1) << TCR_EPD1_SHIFT)
231 #define TCR_IRGN1_SHIFT		24
232 #define TCR_IRGN1_MASK		(UL(3) << TCR_IRGN1_SHIFT)
233 #define TCR_IRGN1_NC		(UL(0) << TCR_IRGN1_SHIFT)
234 #define TCR_IRGN1_WBWA		(UL(1) << TCR_IRGN1_SHIFT)
235 #define TCR_IRGN1_WT		(UL(2) << TCR_IRGN1_SHIFT)
236 #define TCR_IRGN1_WBnWA		(UL(3) << TCR_IRGN1_SHIFT)
237 
238 #define TCR_IRGN_NC		(TCR_IRGN0_NC | TCR_IRGN1_NC)
239 #define TCR_IRGN_WBWA		(TCR_IRGN0_WBWA | TCR_IRGN1_WBWA)
240 #define TCR_IRGN_WT		(TCR_IRGN0_WT | TCR_IRGN1_WT)
241 #define TCR_IRGN_WBnWA		(TCR_IRGN0_WBnWA | TCR_IRGN1_WBnWA)
242 #define TCR_IRGN_MASK		(TCR_IRGN0_MASK | TCR_IRGN1_MASK)
243 
244 
245 #define TCR_ORGN0_SHIFT		10
246 #define TCR_ORGN0_MASK		(UL(3) << TCR_ORGN0_SHIFT)
247 #define TCR_ORGN0_NC		(UL(0) << TCR_ORGN0_SHIFT)
248 #define TCR_ORGN0_WBWA		(UL(1) << TCR_ORGN0_SHIFT)
249 #define TCR_ORGN0_WT		(UL(2) << TCR_ORGN0_SHIFT)
250 #define TCR_ORGN0_WBnWA		(UL(3) << TCR_ORGN0_SHIFT)
251 
252 #define TCR_ORGN1_SHIFT		26
253 #define TCR_ORGN1_MASK		(UL(3) << TCR_ORGN1_SHIFT)
254 #define TCR_ORGN1_NC		(UL(0) << TCR_ORGN1_SHIFT)
255 #define TCR_ORGN1_WBWA		(UL(1) << TCR_ORGN1_SHIFT)
256 #define TCR_ORGN1_WT		(UL(2) << TCR_ORGN1_SHIFT)
257 #define TCR_ORGN1_WBnWA		(UL(3) << TCR_ORGN1_SHIFT)
258 
259 #define TCR_ORGN_NC		(TCR_ORGN0_NC | TCR_ORGN1_NC)
260 #define TCR_ORGN_WBWA		(TCR_ORGN0_WBWA | TCR_ORGN1_WBWA)
261 #define TCR_ORGN_WT		(TCR_ORGN0_WT | TCR_ORGN1_WT)
262 #define TCR_ORGN_WBnWA		(TCR_ORGN0_WBnWA | TCR_ORGN1_WBnWA)
263 #define TCR_ORGN_MASK		(TCR_ORGN0_MASK | TCR_ORGN1_MASK)
264 
265 #define TCR_SH0_SHIFT		12
266 #define TCR_SH0_MASK		(UL(3) << TCR_SH0_SHIFT)
267 #define TCR_SH0_INNER		(UL(3) << TCR_SH0_SHIFT)
268 
269 #define TCR_SH1_SHIFT		28
270 #define TCR_SH1_MASK		(UL(3) << TCR_SH1_SHIFT)
271 #define TCR_SH1_INNER		(UL(3) << TCR_SH1_SHIFT)
272 #define TCR_SHARED		(TCR_SH0_INNER | TCR_SH1_INNER)
273 
274 #define TCR_TG0_SHIFT		14
275 #define TCR_TG0_MASK		(UL(3) << TCR_TG0_SHIFT)
276 #define TCR_TG0_4K		(UL(0) << TCR_TG0_SHIFT)
277 #define TCR_TG0_64K		(UL(1) << TCR_TG0_SHIFT)
278 #define TCR_TG0_16K		(UL(2) << TCR_TG0_SHIFT)
279 
280 #define TCR_TG1_SHIFT		30
281 #define TCR_TG1_MASK		(UL(3) << TCR_TG1_SHIFT)
282 #define TCR_TG1_16K		(UL(1) << TCR_TG1_SHIFT)
283 #define TCR_TG1_4K		(UL(2) << TCR_TG1_SHIFT)
284 #define TCR_TG1_64K		(UL(3) << TCR_TG1_SHIFT)
285 
286 #define TCR_IPS_SHIFT		32
287 #define TCR_IPS_MASK		(UL(7) << TCR_IPS_SHIFT)
288 #define TCR_A1			(UL(1) << 22)
289 #define TCR_ASID16		(UL(1) << 36)
290 #define TCR_TBI0		(UL(1) << 37)
291 #define TCR_TBI1		(UL(1) << 38)
292 #define TCR_HA			(UL(1) << 39)
293 #define TCR_HD			(UL(1) << 40)
294 #define TCR_NFD0		(UL(1) << 53)
295 #define TCR_NFD1		(UL(1) << 54)
296 #define TCR_E0PD0		(UL(1) << 55)
297 #define TCR_E0PD1		(UL(1) << 56)
298 
299 /*
300  * TTBR.
301  */
302 #ifdef CONFIG_ARM64_PA_BITS_52
303 /*
304  * This should be GENMASK_ULL(47, 2).
305  * TTBR_ELx[1] is RES0 in this configuration.
306  */
307 #define TTBR_BADDR_MASK_52	(((UL(1) << 46) - 1) << 2)
308 #endif
309 
310 #ifdef CONFIG_ARM64_VA_BITS_52
311 /* Must be at least 64-byte aligned to prevent corruption of the TTBR */
312 #define TTBR1_BADDR_4852_OFFSET	(((UL(1) << (52 - PGDIR_SHIFT)) - \
313 				 (UL(1) << (48 - PGDIR_SHIFT))) * 8)
314 #endif
315 
316 #endif
317