Achin Gupta | 4f6ad66 | 2013-10-25 09:08:21 +0100 | [diff] [blame] | 1 | /* |
Dan Handley | e83b0ca | 2014-01-14 18:17:09 +0000 | [diff] [blame] | 2 | * Copyright (c) 2013-2014, ARM Limited and Contributors. All rights reserved. |
Achin Gupta | 4f6ad66 | 2013-10-25 09:08:21 +0100 | [diff] [blame] | 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 | |
Dan Handley | 97043ac | 2014-04-09 13:14:54 +0100 | [diff] [blame] | 31 | #include <arch.h> |
Achin Gupta | 4f6ad66 | 2013-10-25 09:08:21 +0100 | [diff] [blame] | 32 | #include <arch_helpers.h> |
Dan Handley | 97043ac | 2014-04-09 13:14:54 +0100 | [diff] [blame] | 33 | #include <assert.h> |
Achin Gupta | 4f6ad66 | 2013-10-25 09:08:21 +0100 | [diff] [blame] | 34 | #include <bl_common.h> |
| 35 | #include <bl31.h> |
Achin Gupta | 7aea908 | 2014-02-01 07:51:28 +0000 | [diff] [blame] | 36 | #include <context_mgmt.h> |
Dan Handley | 97043ac | 2014-04-09 13:14:54 +0100 | [diff] [blame] | 37 | #include <runtime_svc.h> |
| 38 | #include <stdio.h> |
Achin Gupta | 7aea908 | 2014-02-01 07:51:28 +0000 | [diff] [blame] | 39 | |
Jeenu Viswambharan | 7f36660 | 2014-02-20 17:11:00 +0000 | [diff] [blame] | 40 | /******************************************************************************* |
| 41 | * This function pointer is used to initialise the BL32 image. It's initialized |
| 42 | * by SPD calling bl31_register_bl32_init after setting up all things necessary |
| 43 | * for SP execution. In cases where both SPD and SP are absent, or when SPD |
| 44 | * finds it impossible to execute SP, this pointer is left as NULL |
| 45 | ******************************************************************************/ |
Vikram Kanigiri | 6871c5d | 2014-05-16 18:48:12 +0100 | [diff] [blame] | 46 | static int32_t (*bl32_init)(void); |
Jeenu Viswambharan | 7f36660 | 2014-02-20 17:11:00 +0000 | [diff] [blame] | 47 | |
Achin Gupta | 7aea908 | 2014-02-01 07:51:28 +0000 | [diff] [blame] | 48 | /******************************************************************************* |
Achin Gupta | 35ca351 | 2014-02-19 17:58:33 +0000 | [diff] [blame] | 49 | * Variable to indicate whether next image to execute after BL31 is BL33 |
| 50 | * (non-secure & default) or BL32 (secure). |
| 51 | ******************************************************************************/ |
Dan Handley | 625de1d | 2014-04-23 13:47:06 +0100 | [diff] [blame] | 52 | static uint32_t next_image_type; |
Achin Gupta | 35ca351 | 2014-02-19 17:58:33 +0000 | [diff] [blame] | 53 | |
| 54 | /******************************************************************************* |
Achin Gupta | 7aea908 | 2014-02-01 07:51:28 +0000 | [diff] [blame] | 55 | * Simple function to initialise all BL31 helper libraries. |
| 56 | ******************************************************************************/ |
| 57 | void bl31_lib_init() |
| 58 | { |
| 59 | cm_init(); |
| 60 | } |
Achin Gupta | 4f6ad66 | 2013-10-25 09:08:21 +0100 | [diff] [blame] | 61 | |
Achin Gupta | 4f6ad66 | 2013-10-25 09:08:21 +0100 | [diff] [blame] | 62 | /******************************************************************************* |
| 63 | * BL31 is responsible for setting up the runtime services for the primary cpu |
Achin Gupta | 35ca351 | 2014-02-19 17:58:33 +0000 | [diff] [blame] | 64 | * before passing control to the bootloader or an Operating System. This |
| 65 | * function calls runtime_svc_init() which initializes all registered runtime |
| 66 | * services. The run time services would setup enough context for the core to |
| 67 | * swtich to the next exception level. When this function returns, the core will |
| 68 | * switch to the programmed exception level via. an ERET. |
Achin Gupta | 4f6ad66 | 2013-10-25 09:08:21 +0100 | [diff] [blame] | 69 | ******************************************************************************/ |
| 70 | void bl31_main(void) |
| 71 | { |
Achin Gupta | 35ca351 | 2014-02-19 17:58:33 +0000 | [diff] [blame] | 72 | #if DEBUG |
| 73 | unsigned long mpidr = read_mpidr(); |
| 74 | #endif |
Achin Gupta | 4f6ad66 | 2013-10-25 09:08:21 +0100 | [diff] [blame] | 75 | |
| 76 | /* Perform remaining generic architectural setup from EL3 */ |
| 77 | bl31_arch_setup(); |
| 78 | |
| 79 | /* Perform platform setup in BL1 */ |
| 80 | bl31_platform_setup(); |
| 81 | |
Jon Medhurst | fb05246 | 2014-02-17 12:18:24 +0000 | [diff] [blame] | 82 | printf("BL31 %s\n\r", build_message); |
| 83 | |
Achin Gupta | 7aea908 | 2014-02-01 07:51:28 +0000 | [diff] [blame] | 84 | /* Initialise helper libraries */ |
| 85 | bl31_lib_init(); |
Achin Gupta | 4f6ad66 | 2013-10-25 09:08:21 +0100 | [diff] [blame] | 86 | |
| 87 | /* Initialize the runtime services e.g. psci */ |
Achin Gupta | 7421b46 | 2014-02-01 18:53:26 +0000 | [diff] [blame] | 88 | runtime_svc_init(); |
Achin Gupta | 4f6ad66 | 2013-10-25 09:08:21 +0100 | [diff] [blame] | 89 | |
| 90 | /* Clean caches before re-entering normal world */ |
| 91 | dcsw_op_all(DCCSW); |
| 92 | |
Jeenu Viswambharan | caa8493 | 2014-02-06 10:36:15 +0000 | [diff] [blame] | 93 | /* |
Achin Gupta | 35ca351 | 2014-02-19 17:58:33 +0000 | [diff] [blame] | 94 | * Use the more complex exception vectors now that context |
| 95 | * management is setup. SP_EL3 should point to a 'cpu_context' |
| 96 | * structure which has an exception stack allocated. The PSCI |
| 97 | * service should have set the context. |
| 98 | */ |
| 99 | assert(cm_get_context(mpidr, NON_SECURE)); |
| 100 | cm_set_next_eret_context(NON_SECURE); |
Soby Mathew | a43d431 | 2014-04-07 15:28:55 +0100 | [diff] [blame] | 101 | cm_init_pcpu_ptr_cache(); |
Achin Gupta | 35ca351 | 2014-02-19 17:58:33 +0000 | [diff] [blame] | 102 | write_vbar_el3((uint64_t) runtime_exceptions); |
Andrew Thoelke | 8cec598 | 2014-04-28 12:28:39 +0100 | [diff] [blame] | 103 | isb(); |
Dan Handley | 625de1d | 2014-04-23 13:47:06 +0100 | [diff] [blame] | 104 | next_image_type = NON_SECURE; |
Achin Gupta | 35ca351 | 2014-02-19 17:58:33 +0000 | [diff] [blame] | 105 | |
| 106 | /* |
Jeenu Viswambharan | 7f36660 | 2014-02-20 17:11:00 +0000 | [diff] [blame] | 107 | * All the cold boot actions on the primary cpu are done. We now need to |
| 108 | * decide which is the next image (BL32 or BL33) and how to execute it. |
| 109 | * If the SPD runtime service is present, it would want to pass control |
| 110 | * to BL32 first in S-EL1. In that case, SPD would have registered a |
| 111 | * function to intialize bl32 where it takes responsibility of entering |
| 112 | * S-EL1 and returning control back to bl31_main. Once this is done we |
| 113 | * can prepare entry into BL33 as normal. |
Achin Gupta | 35ca351 | 2014-02-19 17:58:33 +0000 | [diff] [blame] | 114 | */ |
| 115 | |
Jeenu Viswambharan | 7f36660 | 2014-02-20 17:11:00 +0000 | [diff] [blame] | 116 | /* |
Vikram Kanigiri | 6871c5d | 2014-05-16 18:48:12 +0100 | [diff] [blame] | 117 | * If SPD had registerd an init hook, invoke it. |
Jeenu Viswambharan | 7f36660 | 2014-02-20 17:11:00 +0000 | [diff] [blame] | 118 | */ |
Achin Gupta | 35ca351 | 2014-02-19 17:58:33 +0000 | [diff] [blame] | 119 | if (bl32_init) |
Vikram Kanigiri | 6871c5d | 2014-05-16 18:48:12 +0100 | [diff] [blame] | 120 | (*bl32_init)(); |
Achin Gupta | 35ca351 | 2014-02-19 17:58:33 +0000 | [diff] [blame] | 121 | |
| 122 | /* |
| 123 | * We are ready to enter the next EL. Prepare entry into the image |
| 124 | * corresponding to the desired security state after the next ERET. |
| 125 | */ |
| 126 | bl31_prepare_next_image_entry(); |
| 127 | } |
| 128 | |
| 129 | /******************************************************************************* |
| 130 | * Accessor functions to help runtime services decide which image should be |
| 131 | * executed after BL31. This is BL33 or the non-secure bootloader image by |
| 132 | * default but the Secure payload dispatcher could override this by requesting |
| 133 | * an entry into BL32 (Secure payload) first. If it does so then it should use |
| 134 | * the same API to program an entry into BL33 once BL32 initialisation is |
| 135 | * complete. |
| 136 | ******************************************************************************/ |
| 137 | void bl31_set_next_image_type(uint32_t security_state) |
| 138 | { |
| 139 | assert(security_state == NON_SECURE || security_state == SECURE); |
| 140 | next_image_type = security_state; |
| 141 | } |
| 142 | |
| 143 | uint32_t bl31_get_next_image_type(void) |
| 144 | { |
| 145 | return next_image_type; |
| 146 | } |
| 147 | |
| 148 | /******************************************************************************* |
| 149 | * This function programs EL3 registers and performs other setup to enable entry |
| 150 | * into the next image after BL31 at the next ERET. |
| 151 | ******************************************************************************/ |
| 152 | void bl31_prepare_next_image_entry() |
| 153 | { |
Vikram Kanigiri | 4112bfa | 2014-04-15 18:08:08 +0100 | [diff] [blame] | 154 | entry_point_info_t *next_image_info; |
Achin Gupta | 35ca351 | 2014-02-19 17:58:33 +0000 | [diff] [blame] | 155 | uint32_t scr, image_type; |
| 156 | |
| 157 | /* Determine which image to execute next */ |
| 158 | image_type = bl31_get_next_image_type(); |
| 159 | |
| 160 | /* |
Jeenu Viswambharan | caa8493 | 2014-02-06 10:36:15 +0000 | [diff] [blame] | 161 | * Setup minimal architectural state of the next highest EL to |
| 162 | * allow execution in it immediately upon entering it. |
| 163 | */ |
Achin Gupta | 35ca351 | 2014-02-19 17:58:33 +0000 | [diff] [blame] | 164 | bl31_next_el_arch_setup(image_type); |
Achin Gupta | 4f6ad66 | 2013-10-25 09:08:21 +0100 | [diff] [blame] | 165 | |
Jeenu Viswambharan | caa8493 | 2014-02-06 10:36:15 +0000 | [diff] [blame] | 166 | /* Program EL3 registers to enable entry into the next EL */ |
Achin Gupta | 35ca351 | 2014-02-19 17:58:33 +0000 | [diff] [blame] | 167 | next_image_info = bl31_get_next_image_info(image_type); |
| 168 | assert(next_image_info); |
| 169 | |
Jeenu Viswambharan | caa8493 | 2014-02-06 10:36:15 +0000 | [diff] [blame] | 170 | scr = read_scr(); |
Andrew Thoelke | bb5ffdb | 2014-05-16 15:38:04 +0100 | [diff] [blame] | 171 | scr &= ~SCR_NS_BIT; |
Achin Gupta | 35ca351 | 2014-02-19 17:58:33 +0000 | [diff] [blame] | 172 | if (image_type == NON_SECURE) |
Jeenu Viswambharan | caa8493 | 2014-02-06 10:36:15 +0000 | [diff] [blame] | 173 | scr |= SCR_NS_BIT; |
| 174 | |
Andrew Thoelke | bb5ffdb | 2014-05-16 15:38:04 +0100 | [diff] [blame] | 175 | scr &= ~SCR_RW_BIT; |
| 176 | if ((next_image_info->spsr & (1 << MODE_RW_SHIFT)) == |
| 177 | (MODE_RW_64 << MODE_RW_SHIFT)) |
| 178 | scr |= SCR_RW_BIT; |
| 179 | |
Jeenu Viswambharan | caa8493 | 2014-02-06 10:36:15 +0000 | [diff] [blame] | 180 | /* |
| 181 | * Tell the context mgmt. library to ensure that SP_EL3 points to |
| 182 | * the right context to exit from EL3 correctly. |
| 183 | */ |
Vikram Kanigiri | 4112bfa | 2014-04-15 18:08:08 +0100 | [diff] [blame] | 184 | cm_set_el3_eret_context(GET_SECURITY_STATE(next_image_info->h.attr), |
| 185 | next_image_info->pc, |
Jeenu Viswambharan | caa8493 | 2014-02-06 10:36:15 +0000 | [diff] [blame] | 186 | next_image_info->spsr, |
| 187 | scr); |
| 188 | |
| 189 | /* Finally set the next context */ |
Vikram Kanigiri | 4112bfa | 2014-04-15 18:08:08 +0100 | [diff] [blame] | 190 | cm_set_next_eret_context(GET_SECURITY_STATE(next_image_info->h.attr)); |
Achin Gupta | 4f6ad66 | 2013-10-25 09:08:21 +0100 | [diff] [blame] | 191 | } |
Jeenu Viswambharan | 7f36660 | 2014-02-20 17:11:00 +0000 | [diff] [blame] | 192 | |
| 193 | /******************************************************************************* |
| 194 | * This function initializes the pointer to BL32 init function. This is expected |
| 195 | * to be called by the SPD after it finishes all its initialization |
| 196 | ******************************************************************************/ |
Vikram Kanigiri | 6871c5d | 2014-05-16 18:48:12 +0100 | [diff] [blame] | 197 | void bl31_register_bl32_init(int32_t (*func)(void)) |
Jeenu Viswambharan | 7f36660 | 2014-02-20 17:11:00 +0000 | [diff] [blame] | 198 | { |
| 199 | bl32_init = func; |
| 200 | } |