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9cce7a43 CM |
1 | /* |
2 | * Based on arch/arm/mm/proc.S | |
3 | * | |
4 | * Copyright (C) 2001 Deep Blue Solutions Ltd. | |
5 | * Copyright (C) 2012 ARM Ltd. | |
6 | * Author: Catalin Marinas <catalin.marinas@arm.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
19 | */ | |
20 | ||
21 | #include <linux/init.h> | |
22 | #include <linux/linkage.h> | |
23 | #include <asm/assembler.h> | |
24 | #include <asm/asm-offsets.h> | |
25 | #include <asm/hwcap.h> | |
26 | #include <asm/pgtable-hwdef.h> | |
27 | #include <asm/pgtable.h> | |
28 | ||
29 | #include "proc-macros.S" | |
30 | ||
35a86976 CM |
31 | #ifdef CONFIG_ARM64_64K_PAGES |
32 | #define TCR_TG_FLAGS TCR_TG0_64K | TCR_TG1_64K | |
33 | #else | |
34 | #define TCR_TG_FLAGS TCR_TG0_4K | TCR_TG1_4K | |
35 | #endif | |
36 | ||
37 | #ifdef CONFIG_SMP | |
38 | #define TCR_SMP_FLAGS TCR_SHARED | |
9cce7a43 | 39 | #else |
35a86976 | 40 | #define TCR_SMP_FLAGS 0 |
9cce7a43 CM |
41 | #endif |
42 | ||
35a86976 CM |
43 | /* PTWs cacheable, inner/outer WBWA */ |
44 | #define TCR_CACHE_FLAGS TCR_IRGN_WBWA | TCR_ORGN_WBWA | |
45 | ||
9cce7a43 CM |
46 | #define MAIR(attr, mt) ((attr) << ((mt) * 8)) |
47 | ||
48 | /* | |
49 | * cpu_cache_off() | |
50 | * | |
51 | * Turn the CPU D-cache off. | |
52 | */ | |
53 | ENTRY(cpu_cache_off) | |
54 | mrs x0, sctlr_el1 | |
55 | bic x0, x0, #1 << 2 // clear SCTLR.C | |
56 | msr sctlr_el1, x0 | |
57 | isb | |
58 | ret | |
59 | ENDPROC(cpu_cache_off) | |
60 | ||
61 | /* | |
62 | * cpu_reset(loc) | |
63 | * | |
64 | * Perform a soft reset of the system. Put the CPU into the same state | |
65 | * as it would be if it had been reset, and branch to what would be the | |
66 | * reset vector. It must be executed with the flat identity mapping. | |
67 | * | |
68 | * - loc - location to jump to for soft reset | |
69 | */ | |
70 | .align 5 | |
71 | ENTRY(cpu_reset) | |
72 | mrs x1, sctlr_el1 | |
73 | bic x1, x1, #1 | |
74 | msr sctlr_el1, x1 // disable the MMU | |
75 | isb | |
76 | ret x0 | |
77 | ENDPROC(cpu_reset) | |
78 | ||
5e051531 AC |
79 | ENTRY(cpu_soft_restart) |
80 | /* Save address of cpu_reset() and reset address */ | |
81 | mov x19, x0 | |
82 | mov x20, x1 | |
83 | ||
84 | /* Turn D-cache off */ | |
85 | bl cpu_cache_off | |
86 | ||
87 | /* Push out all dirty data, and ensure cache is empty */ | |
88 | bl flush_cache_all | |
89 | ||
90 | mov x0, x20 | |
91 | ret x19 | |
92 | ENDPROC(cpu_soft_restart) | |
93 | ||
9cce7a43 CM |
94 | /* |
95 | * cpu_do_idle() | |
96 | * | |
97 | * Idle the processor (wait for interrupt). | |
98 | */ | |
99 | ENTRY(cpu_do_idle) | |
100 | dsb sy // WFI may enter a low-power mode | |
101 | wfi | |
102 | ret | |
103 | ENDPROC(cpu_do_idle) | |
104 | ||
af3cfdbf | 105 | #ifdef CONFIG_CPU_PM |
6732bc65 LP |
106 | /** |
107 | * cpu_do_suspend - save CPU registers context | |
108 | * | |
109 | * x0: virtual address of context pointer | |
110 | */ | |
111 | ENTRY(cpu_do_suspend) | |
112 | mrs x2, tpidr_el0 | |
113 | mrs x3, tpidrro_el0 | |
114 | mrs x4, contextidr_el1 | |
115 | mrs x5, mair_el1 | |
116 | mrs x6, cpacr_el1 | |
117 | mrs x7, ttbr1_el1 | |
118 | mrs x8, tcr_el1 | |
119 | mrs x9, vbar_el1 | |
120 | mrs x10, mdscr_el1 | |
121 | mrs x11, oslsr_el1 | |
122 | mrs x12, sctlr_el1 | |
123 | stp x2, x3, [x0] | |
124 | stp x4, x5, [x0, #16] | |
125 | stp x6, x7, [x0, #32] | |
126 | stp x8, x9, [x0, #48] | |
127 | stp x10, x11, [x0, #64] | |
128 | str x12, [x0, #80] | |
129 | ret | |
130 | ENDPROC(cpu_do_suspend) | |
131 | ||
132 | /** | |
133 | * cpu_do_resume - restore CPU register context | |
134 | * | |
135 | * x0: Physical address of context pointer | |
136 | * x1: ttbr0_el1 to be restored | |
137 | * | |
138 | * Returns: | |
139 | * sctlr_el1 value in x0 | |
140 | */ | |
141 | ENTRY(cpu_do_resume) | |
142 | /* | |
143 | * Invalidate local tlb entries before turning on MMU | |
144 | */ | |
145 | tlbi vmalle1 | |
146 | ldp x2, x3, [x0] | |
147 | ldp x4, x5, [x0, #16] | |
148 | ldp x6, x7, [x0, #32] | |
149 | ldp x8, x9, [x0, #48] | |
150 | ldp x10, x11, [x0, #64] | |
151 | ldr x12, [x0, #80] | |
152 | msr tpidr_el0, x2 | |
153 | msr tpidrro_el0, x3 | |
154 | msr contextidr_el1, x4 | |
155 | msr mair_el1, x5 | |
156 | msr cpacr_el1, x6 | |
157 | msr ttbr0_el1, x1 | |
158 | msr ttbr1_el1, x7 | |
159 | msr tcr_el1, x8 | |
160 | msr vbar_el1, x9 | |
161 | msr mdscr_el1, x10 | |
162 | /* | |
163 | * Restore oslsr_el1 by writing oslar_el1 | |
164 | */ | |
165 | ubfx x11, x11, #1, #1 | |
166 | msr oslar_el1, x11 | |
167 | mov x0, x12 | |
168 | dsb nsh // Make sure local tlb invalidation completed | |
169 | isb | |
170 | ret | |
171 | ENDPROC(cpu_do_resume) | |
172 | #endif | |
173 | ||
9cce7a43 | 174 | /* |
812944e9 | 175 | * cpu_do_switch_mm(pgd_phys, tsk) |
9cce7a43 CM |
176 | * |
177 | * Set the translation table base pointer to be pgd_phys. | |
178 | * | |
179 | * - pgd_phys - physical address of new TTB | |
180 | */ | |
181 | ENTRY(cpu_do_switch_mm) | |
182 | mmid w1, x1 // get mm->context.id | |
183 | bfi x0, x1, #48, #16 // set the ASID | |
184 | msr ttbr0_el1, x0 // set TTBR0 | |
185 | isb | |
186 | ret | |
187 | ENDPROC(cpu_do_switch_mm) | |
188 | ||
9cce7a43 CM |
189 | .section ".text.init", #alloc, #execinstr |
190 | ||
191 | /* | |
192 | * __cpu_setup | |
193 | * | |
194 | * Initialise the processor for turning the MMU on. Return in x0 the | |
195 | * value of the SCTLR_EL1 register. | |
196 | */ | |
197 | ENTRY(__cpu_setup) | |
9cce7a43 | 198 | ic iallu // I+BTB cache invalidate |
3cea71bc | 199 | tlbi vmalle1is // invalidate I + D TLBs |
dc60b777 | 200 | dsb ish |
9cce7a43 CM |
201 | |
202 | mov x0, #3 << 20 | |
203 | msr cpacr_el1, x0 // Enable FP/ASIMD | |
9c413e25 | 204 | msr mdscr_el1, xzr // Reset mdscr_el1 |
9cce7a43 CM |
205 | /* |
206 | * Memory region attributes for LPAE: | |
207 | * | |
208 | * n = AttrIndx[2:0] | |
209 | * n MAIR | |
210 | * DEVICE_nGnRnE 000 00000000 | |
211 | * DEVICE_nGnRE 001 00000100 | |
212 | * DEVICE_GRE 010 00001100 | |
213 | * NORMAL_NC 011 01000100 | |
214 | * NORMAL 100 11111111 | |
215 | */ | |
216 | ldr x5, =MAIR(0x00, MT_DEVICE_nGnRnE) | \ | |
217 | MAIR(0x04, MT_DEVICE_nGnRE) | \ | |
218 | MAIR(0x0c, MT_DEVICE_GRE) | \ | |
219 | MAIR(0x44, MT_NORMAL_NC) | \ | |
220 | MAIR(0xff, MT_NORMAL) | |
221 | msr mair_el1, x5 | |
222 | /* | |
223 | * Prepare SCTLR | |
224 | */ | |
225 | adr x5, crval | |
226 | ldp w5, w6, [x5] | |
227 | mrs x0, sctlr_el1 | |
228 | bic x0, x0, x5 // clear bits | |
229 | orr x0, x0, x6 // set bits | |
230 | /* | |
231 | * Set/prepare TCR and TTBR. We use 512GB (39-bit) address range for | |
232 | * both user and kernel. | |
233 | */ | |
35a86976 CM |
234 | ldr x10, =TCR_TxSZ(VA_BITS) | TCR_CACHE_FLAGS | TCR_SMP_FLAGS | \ |
235 | TCR_TG_FLAGS | TCR_ASID16 | TCR_TBI0 | |
87366d8c RMC |
236 | /* |
237 | * Read the PARange bits from ID_AA64MMFR0_EL1 and set the IPS bits in | |
238 | * TCR_EL1. | |
239 | */ | |
240 | mrs x9, ID_AA64MMFR0_EL1 | |
241 | bfi x10, x9, #32, #3 | |
9cce7a43 CM |
242 | msr tcr_el1, x10 |
243 | ret // return to head.S | |
244 | ENDPROC(__cpu_setup) | |
245 | ||
246 | /* | |
9f71ac96 SP |
247 | * We set the desired value explicitly, including those of the |
248 | * reserved bits. The values of bits EE & E0E were set early in | |
249 | * el2_setup, which are left untouched below. | |
250 | * | |
9cce7a43 CM |
251 | * n n T |
252 | * U E WT T UD US IHBS | |
253 | * CE0 XWHW CZ ME TEEA S | |
254 | * .... .IEE .... NEAI TE.I ..AD DEN0 ACAM | |
9f71ac96 SP |
255 | * 0011 0... 1101 ..0. ..0. 10.. .0.. .... < hardware reserved |
256 | * .... .1.. .... 01.1 11.1 ..01 0.01 1101 < software settings | |
9cce7a43 CM |
257 | */ |
258 | .type crval, #object | |
259 | crval: | |
9f71ac96 SP |
260 | .word 0xfcffffff // clear |
261 | .word 0x34d5d91d // set |