xref: /rk3399_ARM-atf/bl31/bl31_main.c (revision ee656609c8e9292f65ad82100f4ca190b7882a05)
1 /*
2  * Copyright (c) 2013-2025, Arm Limited and Contributors. All rights reserved.
3  *
4  * SPDX-License-Identifier: BSD-3-Clause
5  */
6 
7 #include <assert.h>
8 #include <string.h>
9 
10 #include <arch.h>
11 #include <arch_features.h>
12 #include <arch_helpers.h>
13 #include <bl31/bl31.h>
14 #include <bl31/ehf.h>
15 #include <common/bl_common.h>
16 #include <common/build_message.h>
17 #include <common/debug.h>
18 #include <common/feat_detect.h>
19 #include <common/runtime_svc.h>
20 #include <drivers/console.h>
21 #include <lib/bootmarker_capture.h>
22 #include <lib/el3_runtime/context_debug.h>
23 #include <lib/el3_runtime/context_mgmt.h>
24 #include <lib/pmf/pmf.h>
25 #include <lib/runtime_instr.h>
26 #include <plat/common/platform.h>
27 #include <services/std_svc.h>
28 
29 #if ENABLE_RUNTIME_INSTRUMENTATION
30 	PMF_REGISTER_SERVICE_SMC(rt_instr_svc, PMF_RT_INSTR_SVC_ID,
31 		RT_INSTR_TOTAL_IDS, PMF_STORE_ENABLE)
32 #endif
33 
34 #if ENABLE_RUNTIME_INSTRUMENTATION
35 	PMF_REGISTER_SERVICE(bl_svc, PMF_RT_INSTR_SVC_ID,
36 		BL_TOTAL_IDS, PMF_DUMP_ENABLE)
37 #endif
38 
39 /*******************************************************************************
40  * This function pointer is used to initialise the BL32 image. It's initialized
41  * by SPD calling bl31_register_bl32_init after setting up all things necessary
42  * for SP execution. In cases where both SPD and SP are absent, or when SPD
43  * finds it impossible to execute SP, this pointer is left as NULL
44  ******************************************************************************/
45 static int32_t (*bl32_init)(void);
46 
47 /*****************************************************************************
48  * Function used to initialise RMM if RME is enabled
49  *****************************************************************************/
50 #if ENABLE_RME
51 static int32_t (*rmm_init)(void);
52 #endif
53 
54 /*******************************************************************************
55  * Variable to indicate whether next image to execute after BL31 is BL33
56  * (non-secure & default) or BL32 (secure).
57  ******************************************************************************/
58 static uint32_t next_image_type = NON_SECURE;
59 
60 #ifdef SUPPORT_UNKNOWN_MPID
61 /*
62  * Flag to know whether an unsupported MPID has been detected. To avoid having it
63  * landing on the .bss section, it is initialized to a non-zero value, this way
64  * we avoid potential WAW hazards during system bring up.
65  * */
66 volatile uint32_t unsupported_mpid_flag = 1;
67 #endif
68 
69 /*
70  * Implement the ARM Standard Service function to get arguments for a
71  * particular service.
72  */
73 uintptr_t get_arm_std_svc_args(unsigned int svc_mask)
74 {
75 	/* Setup the arguments for PSCI Library */
76 	DEFINE_STATIC_PSCI_LIB_ARGS_V1(psci_args, bl31_warm_entrypoint);
77 
78 	/* PSCI is the only ARM Standard Service implemented */
79 	assert(svc_mask == PSCI_FID_MASK);
80 
81 	return (uintptr_t)&psci_args;
82 }
83 
84 /*******************************************************************************
85  * Simple function to initialise all BL31 helper libraries.
86  ******************************************************************************/
87 static void __init bl31_lib_init(void)
88 {
89 	cm_init();
90 }
91 
92 /*******************************************************************************
93  * Setup function for BL31.
94  ******************************************************************************/
95 void bl31_setup(u_register_t arg0, u_register_t arg1, u_register_t arg2,
96 		u_register_t arg3)
97 {
98 	/* Enable early console if EARLY_CONSOLE flag is enabled */
99 	plat_setup_early_console();
100 
101 	/* Perform early platform-specific setup */
102 	bl31_early_platform_setup2(arg0, arg1, arg2, arg3);
103 
104 	/* Perform late platform-specific setup */
105 	bl31_plat_arch_setup();
106 
107 	/* Prints context_memory allocated for all the security states */
108 	report_ctx_memory_usage();
109 }
110 
111 /*******************************************************************************
112  * BL31 is responsible for setting up the runtime services for the primary cpu
113  * before passing control to the bootloader or an Operating System. This
114  * function calls runtime_svc_init() which initializes all registered runtime
115  * services. The run time services would setup enough context for the core to
116  * switch to the next exception level. When this function returns, the core will
117  * switch to the programmed exception level via an ERET.
118  ******************************************************************************/
119 void bl31_main(void)
120 {
121 	/* Init registers that never change for the lifetime of TF-A */
122 	cm_manage_extensions_el3(plat_my_core_pos());
123 
124 	/* Init per-world context registers for non-secure world */
125 	manage_extensions_nonsecure_per_world();
126 
127 	NOTICE("BL31: %s\n", build_version_string);
128 	NOTICE("BL31: %s\n", build_message);
129 
130 #if FEATURE_DETECTION
131 	/* Detect if features enabled during compilation are supported by PE. */
132 	detect_arch_features();
133 #endif /* FEATURE_DETECTION */
134 
135 #if ENABLE_RUNTIME_INSTRUMENTATION
136 	PMF_CAPTURE_TIMESTAMP(bl_svc, BL31_ENTRY, PMF_CACHE_MAINT);
137 #endif
138 
139 #ifdef SUPPORT_UNKNOWN_MPID
140 	if (unsupported_mpid_flag == 0) {
141 		NOTICE("Unsupported MPID detected!\n");
142 	}
143 #endif
144 
145 	/* Perform platform setup in BL31 */
146 	bl31_platform_setup();
147 
148 	/* Initialise helper libraries */
149 	bl31_lib_init();
150 
151 #if EL3_EXCEPTION_HANDLING
152 	INFO("BL31: Initialising Exception Handling Framework\n");
153 	ehf_init();
154 #endif
155 
156 	/* Initialize the runtime services e.g. psci. */
157 	INFO("BL31: Initializing runtime services\n");
158 	runtime_svc_init();
159 
160 	/*
161 	 * All the cold boot actions on the primary cpu are done. We now need to
162 	 * decide which is the next image and how to execute it.
163 	 * If the SPD runtime service is present, it would want to pass control
164 	 * to BL32 first in S-EL1. In that case, SPD would have registered a
165 	 * function to initialize bl32 where it takes responsibility of entering
166 	 * S-EL1 and returning control back to bl31_main. Similarly, if RME is
167 	 * enabled and a function is registered to initialize RMM, control is
168 	 * transferred to RMM in R-EL2. After RMM initialization, control is
169 	 * returned back to bl31_main. Once this is done we can prepare entry
170 	 * into BL33 as normal.
171 	 */
172 
173 	/*
174 	 * If SPD had registered an init hook, invoke it.
175 	 */
176 	if (bl32_init != NULL) {
177 		INFO("BL31: Initializing BL32\n");
178 
179 		console_flush();
180 		int32_t rc = (*bl32_init)();
181 
182 		if (rc == 0) {
183 			WARN("BL31: BL32 initialization failed\n");
184 		}
185 	}
186 
187 	/*
188 	 * If RME is enabled and init hook is registered, initialize RMM
189 	 * in R-EL2.
190 	 */
191 #if ENABLE_RME
192 	if (rmm_init != NULL) {
193 		INFO("BL31: Initializing RMM\n");
194 
195 		console_flush();
196 		int32_t rc = (*rmm_init)();
197 
198 		if (rc == 0) {
199 			WARN("BL31: RMM initialization failed\n");
200 		}
201 	}
202 #endif
203 
204 	/*
205 	 * We are ready to enter the next EL. Prepare entry into the image
206 	 * corresponding to the desired security state after the next ERET.
207 	 */
208 	bl31_prepare_next_image_entry();
209 
210 	/*
211 	 * Perform any platform specific runtime setup prior to cold boot exit
212 	 * from BL31
213 	 */
214 	bl31_plat_runtime_setup();
215 
216 #if ENABLE_RUNTIME_INSTRUMENTATION
217 	console_flush();
218 	PMF_CAPTURE_TIMESTAMP(bl_svc, BL31_EXIT, PMF_CACHE_MAINT);
219 #endif
220 
221 	console_flush();
222 	console_switch_state(CONSOLE_FLAG_RUNTIME);
223 }
224 
225 /*******************************************************************************
226  * Accessor functions to help runtime services decide which image should be
227  * executed after BL31. This is BL33 or the non-secure bootloader image by
228  * default but the Secure payload dispatcher could override this by requesting
229  * an entry into BL32 (Secure payload) first. If it does so then it should use
230  * the same API to program an entry into BL33 once BL32 initialisation is
231  * complete.
232  ******************************************************************************/
233 void bl31_set_next_image_type(uint32_t security_state)
234 {
235 	assert(sec_state_is_valid(security_state));
236 	next_image_type = security_state;
237 }
238 
239 uint32_t bl31_get_next_image_type(void)
240 {
241 	return next_image_type;
242 }
243 
244 /*******************************************************************************
245  * This function programs EL3 registers and performs other setup to enable entry
246  * into the next image after BL31 at the next ERET.
247  ******************************************************************************/
248 void __init bl31_prepare_next_image_entry(void)
249 {
250 	const entry_point_info_t *next_image_info;
251 	uint32_t image_type;
252 
253 #if CTX_INCLUDE_AARCH32_REGS
254 	/*
255 	 * Ensure that the build flag to save AArch32 system registers in CPU
256 	 * context is not set for AArch64-only platforms.
257 	 */
258 	if (el_implemented(1) == EL_IMPL_A64ONLY) {
259 		ERROR("EL1 supports AArch64-only. Please set build flag "
260 				"CTX_INCLUDE_AARCH32_REGS = 0\n");
261 		panic();
262 	}
263 #endif
264 
265 	/* Determine which image to execute next */
266 	image_type = bl31_get_next_image_type();
267 
268 	/* Program EL3 registers to enable entry into the next EL */
269 	next_image_info = bl31_plat_get_next_image_ep_info(image_type);
270 	assert(next_image_info != NULL);
271 	assert(image_type == GET_SECURITY_STATE(next_image_info->h.attr));
272 
273 	INFO("BL31: Preparing for EL3 exit to %s world\n",
274 		(image_type == SECURE) ? "secure" : "normal");
275 	print_entry_point_info(next_image_info);
276 	cm_init_my_context(next_image_info);
277 
278 	/*
279 	* If we are entering the Non-secure world, use
280 	* 'cm_prepare_el3_exit_ns' to exit.
281 	*/
282 	if (image_type == NON_SECURE) {
283 		cm_prepare_el3_exit_ns();
284 	} else {
285 		cm_prepare_el3_exit(image_type);
286 	}
287 }
288 
289 /*******************************************************************************
290  * This function initializes the pointer to BL32 init function. This is expected
291  * to be called by the SPD after it finishes all its initialization
292  ******************************************************************************/
293 void bl31_register_bl32_init(int32_t (*func)(void))
294 {
295 	bl32_init = func;
296 }
297 
298 #if ENABLE_RME
299 /*******************************************************************************
300  * This function initializes the pointer to RMM init function. This is expected
301  * to be called by the RMMD after it finishes all its initialization
302  ******************************************************************************/
303 void bl31_register_rmm_init(int32_t (*func)(void))
304 {
305 	rmm_init = func;
306 }
307 #endif
308