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git01.mediatek.com / filogic / atf / 74c1a2a479663240f579212537c978b6ac40553b / . / bl32 / tsp / aarch64 / tsp_entrypoint.S
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Achin Gupta7c88f3f2014-02-18 18:09:12 +0000[diff] [blame]1/*
2 * Copyright (c) 2013-2014, ARM Limited and Contributors. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are met:
6 *
7 * Redistributions of source code must retain the above copyright notice, this
8 * list of conditions and the following disclaimer.
9 *
10 * Redistributions in binary form must reproduce the above copyright notice,
11 * this list of conditions and the following disclaimer in the documentation
12 * and/or other materials provided with the distribution.
13 *
14 * Neither the name of ARM nor the names of its contributors may be used
15 * to endorse or promote products derived from this software without specific
16 * prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#include <bl_common.h>
32#include <arch.h>
33#include <tsp.h>
34
35
36 .globl tsp_entrypoint
37 .globl tsp_cpu_on_entry
38 .globl tsp_cpu_off_entry
39 .globl tsp_cpu_suspend_entry
40 .globl tsp_cpu_resume_entry
41 .globl tsp_fast_smc_entry
42
43 /* ---------------------------------------------
44 * Populate the params in x0-x7 from the pointer
45 * to the smc args structure in x0.
46 * ---------------------------------------------
47 */
48 .macro restore_args_call_smc
49 ldp x6, x7, [x0, #TSP_ARG6]
50 ldp x4, x5, [x0, #TSP_ARG4]
51 ldp x2, x3, [x0, #TSP_ARG2]
52 ldp x0, x1, [x0, #TSP_ARG0]
53 smc #0
54 .endm
55
56 .section .text, "ax"; .align 3
57
58
59tsp_entrypoint: ; .type tsp_entrypoint, %function
60 /*---------------------------------------------
61 * Store the extents of the tzram available to
62 * BL32 for future use.
63 * TODO: We are assuming that x9-x10 will not be
64 * corrupted by any function before platform
65 * setup.
66 * ---------------------------------------------
67 */
68 mov x9, x0
69 mov x10, x1
70
71 /* ---------------------------------------------
72 * The entrypoint is expected to be executed
73 * only by the primary cpu (at least for now).
74 * So, make sure no secondary has lost its way.
75 * ---------------------------------------------
76 */
77 mrs x0, mpidr_el1
78 bl platform_is_primary_cpu
79 cbz x0, tsp_entrypoint_panic
80
81 /* ---------------------------------------------
82 * Set the exception vector to something sane.
83 * ---------------------------------------------
84 */
85 adr x0, early_exceptions
86 msr vbar_el1, x0
87
88 /* ---------------------------------------------
89 * Enable the instruction cache.
90 * ---------------------------------------------
91 */
92 mrs x0, sctlr_el1
93 orr x0, x0, #SCTLR_I_BIT
94 msr sctlr_el1, x0
95 isb
96
97 /* ---------------------------------------------
98 * Zero out NOBITS sections. There are 2 of them:
99 * - the .bss section;
100 * - the coherent memory section.
101 * ---------------------------------------------
102 */
103 ldr x0, =__BSS_START__
104 ldr x1, =__BSS_SIZE__
105 bl zeromem16
106
107 ldr x0, =__COHERENT_RAM_START__
108 ldr x1, =__COHERENT_RAM_UNALIGNED_SIZE__
109 bl zeromem16
110
111 /* --------------------------------------------
112 * Give ourselves a small coherent stack to
113 * ease the pain of initializing the MMU
114 * --------------------------------------------
115 */
116 mrs x0, mpidr_el1
117 bl platform_set_coherent_stack
118
119 /* ---------------------------------------------
120 * Perform early platform setup & platform
121 * specific early arch. setup e.g. mmu setup
122 * ---------------------------------------------
123 */
124 mov x0, x9
125 mov x1, x10
126 bl bl32_early_platform_setup
127 bl bl32_plat_arch_setup
128
129 /* ---------------------------------------------
130 * Give ourselves a stack allocated in Normal
131 * -IS-WBWA memory
132 * ---------------------------------------------
133 */
134 mrs x0, mpidr_el1
135 bl platform_set_stack
136
137 /* ---------------------------------------------
138 * Jump to main function.
139 * ---------------------------------------------
140 */
141 bl tsp_main
142
143 /* ---------------------------------------------
144 * Tell TSPD that we are done initialising
145 * ---------------------------------------------
146 */
147 mov x1, x0
148 mov x0, #TSP_ENTRY_DONE
149 smc #0
150
151tsp_entrypoint_panic:
152 b tsp_entrypoint_panic
153
154 /*---------------------------------------------
155 * This entrypoint is used by the TSPD when this
156 * cpu is to be turned off through a CPU_OFF
157 * psci call to ask the TSP to perform any
158 * bookeeping necessary. In the current
159 * implementation, the TSPD expects the TSP to
160 * re-initialise its state so nothing is done
161 * here except for acknowledging the request.
162 * ---------------------------------------------
163 */
164tsp_cpu_off_entry: ; .type tsp_cpu_off_entry, %function
165 bl tsp_cpu_off_main
166 restore_args_call_smc
167
168 /*---------------------------------------------
169 * This entrypoint is used by the TSPD when this
170 * cpu is turned on using a CPU_ON psci call to
171 * ask the TSP to initialise itself i.e. setup
172 * the mmu, stacks etc. Minimal architectural
173 * state will be initialised by the TSPD when
174 * this function is entered i.e. Caches and MMU
175 * will be turned off, the execution state
176 * will be aarch64 and exceptions masked.
177 * ---------------------------------------------
178 */
179tsp_cpu_on_entry: ; .type tsp_cpu_on_entry, %function
180 /* ---------------------------------------------
181 * Set the exception vector to something sane.
182 * ---------------------------------------------
183 */
184 adr x0, early_exceptions
185 msr vbar_el1, x0
186
187 /* ---------------------------------------------
188 * Enable the instruction cache.
189 * ---------------------------------------------
190 */
191 mrs x0, sctlr_el1
192 orr x0, x0, #SCTLR_I_BIT
193 msr sctlr_el1, x0
194 isb
195
196 /* --------------------------------------------
197 * Give ourselves a small coherent stack to
198 * ease the pain of initializing the MMU
199 * --------------------------------------------
200 */
201 mrs x0, mpidr_el1
202 bl platform_set_coherent_stack
203
204 /* ---------------------------------------------
205 * Initialise the MMU
206 * ---------------------------------------------
207 */
208 bl enable_mmu
209
210 /* ---------------------------------------------
211 * Give ourselves a stack allocated in Normal
212 * -IS-WBWA memory
213 * ---------------------------------------------
214 */
215 mrs x0, mpidr_el1
216 bl platform_set_stack
217
218 /* ---------------------------------------------
219 * Enter C runtime to perform any remaining
220 * book keeping
221 * ---------------------------------------------
222 */
223 bl tsp_cpu_on_main
224 restore_args_call_smc
225
226 /* Should never reach here */
227tsp_cpu_on_entry_panic:
228 b tsp_cpu_on_entry_panic
229
230 /*---------------------------------------------
231 * This entrypoint is used by the TSPD when this
232 * cpu is to be suspended through a CPU_SUSPEND
233 * psci call to ask the TSP to perform any
234 * bookeeping necessary. In the current
235 * implementation, the TSPD saves and restores
236 * the EL1 state.
237 * ---------------------------------------------
238 */
239tsp_cpu_suspend_entry: ; .type tsp_cpu_suspend_entry, %function
240 bl tsp_cpu_suspend_main
241 restore_args_call_smc
242
243 /*---------------------------------------------
244 * This entrypoint is used by the TSPD when this
245 * cpu resumes execution after an earlier
246 * CPU_SUSPEND psci call to ask the TSP to
247 * restore its saved context. In the current
248 * implementation, the TSPD saves and restores
249 * EL1 state so nothing is done here apart from
250 * acknowledging the request.
251 * ---------------------------------------------
252 */
253tsp_cpu_resume_entry: ; .type tsp_cpu_resume_entry, %function
254 bl tsp_cpu_resume_main
255 restore_args_call_smc
256tsp_cpu_resume_panic:
257 b tsp_cpu_resume_panic
258
259 /*---------------------------------------------
260 * This entrypoint is used by the TSPD to ask
261 * the TSP to service a fast smc request.
262 * ---------------------------------------------
263 */
264tsp_fast_smc_entry: ; .type tsp_fast_smc_entry, %function
265 bl tsp_fast_smc_handler
266 restore_args_call_smc
267tsp_fast_smc_entry_panic:
268 b tsp_fast_smc_entry_panic
269