Yatharth Kochar | 7baff11 | 2015-10-09 18:06:13 +0100 | [diff] [blame] | 1 | /* |
Antonio Nino Diaz | a0fee74 | 2018-10-31 15:25:35 +0000 | [diff] [blame] | 2 | * Copyright (c) 2015-2018, ARM Limited and Contributors. All rights reserved. |
Yatharth Kochar | 7baff11 | 2015-10-09 18:06:13 +0100 | [diff] [blame] | 3 | * |
dp-arm | 82cb2c1 | 2017-05-03 09:38:09 +0100 | [diff] [blame] | 4 | * SPDX-License-Identifier: BSD-3-Clause |
Yatharth Kochar | 7baff11 | 2015-10-09 18:06:13 +0100 | [diff] [blame] | 5 | */ |
| 6 | |
Yatharth Kochar | 7baff11 | 2015-10-09 18:06:13 +0100 | [diff] [blame] | 7 | #include <assert.h> |
Antonio Nino Diaz | 09d40e0 | 2018-12-14 00:18:21 +0000 | [diff] [blame] | 8 | |
| 9 | #include <arch_helpers.h> |
Yatharth Kochar | 7baff11 | 2015-10-09 18:06:13 +0100 | [diff] [blame] | 10 | #include <context.h> |
Antonio Nino Diaz | 09d40e0 | 2018-12-14 00:18:21 +0000 | [diff] [blame] | 11 | #include <common/debug.h> |
| 12 | #include <lib/el3_runtime/context_mgmt.h> |
| 13 | #include <plat/common/platform.h> |
| 14 | |
Etienne Carriere | c04d59c | 2017-06-07 16:41:50 +0200 | [diff] [blame] | 15 | #include "../bl1_private.h" |
Yatharth Kochar | 7baff11 | 2015-10-09 18:06:13 +0100 | [diff] [blame] | 16 | |
| 17 | /* |
| 18 | * Following array will be used for context management. |
| 19 | * There are 2 instances, for the Secure and Non-Secure contexts. |
| 20 | */ |
| 21 | static cpu_context_t bl1_cpu_context[2]; |
| 22 | |
| 23 | /* Following contains the cpu context pointers. */ |
| 24 | static void *bl1_cpu_context_ptr[2]; |
| 25 | |
| 26 | |
| 27 | void *cm_get_context(uint32_t security_state) |
| 28 | { |
| 29 | assert(sec_state_is_valid(security_state)); |
| 30 | return bl1_cpu_context_ptr[security_state]; |
| 31 | } |
| 32 | |
| 33 | void cm_set_context(void *context, uint32_t security_state) |
| 34 | { |
| 35 | assert(sec_state_is_valid(security_state)); |
| 36 | bl1_cpu_context_ptr[security_state] = context; |
| 37 | } |
| 38 | |
| 39 | /******************************************************************************* |
| 40 | * This function prepares the context for Secure/Normal world images. |
| 41 | * Normal world images are transitioned to EL2(if supported) else EL1. |
| 42 | ******************************************************************************/ |
| 43 | void bl1_prepare_next_image(unsigned int image_id) |
| 44 | { |
| 45 | unsigned int security_state; |
| 46 | image_desc_t *image_desc; |
| 47 | entry_point_info_t *next_bl_ep; |
| 48 | |
Soby Mathew | 8cd16e6 | 2016-05-17 14:01:32 +0100 | [diff] [blame] | 49 | #if CTX_INCLUDE_AARCH32_REGS |
| 50 | /* |
| 51 | * Ensure that the build flag to save AArch32 system registers in CPU |
| 52 | * context is not set for AArch64-only platforms. |
| 53 | */ |
Antonio Nino Diaz | a0fee74 | 2018-10-31 15:25:35 +0000 | [diff] [blame] | 54 | if (el_implemented(1) == EL_IMPL_A64ONLY) { |
Soby Mathew | 8cd16e6 | 2016-05-17 14:01:32 +0100 | [diff] [blame] | 55 | ERROR("EL1 supports AArch64-only. Please set build flag " |
Antonio Nino Diaz | a0fee74 | 2018-10-31 15:25:35 +0000 | [diff] [blame] | 56 | "CTX_INCLUDE_AARCH32_REGS = 0\n"); |
Soby Mathew | 8cd16e6 | 2016-05-17 14:01:32 +0100 | [diff] [blame] | 57 | panic(); |
| 58 | } |
| 59 | #endif |
| 60 | |
Yatharth Kochar | 7baff11 | 2015-10-09 18:06:13 +0100 | [diff] [blame] | 61 | /* Get the image descriptor. */ |
| 62 | image_desc = bl1_plat_get_image_desc(image_id); |
| 63 | assert(image_desc); |
| 64 | |
| 65 | /* Get the entry point info. */ |
| 66 | next_bl_ep = &image_desc->ep_info; |
| 67 | |
| 68 | /* Get the image security state. */ |
Yatharth Kochar | 843ddee | 2016-02-01 11:04:46 +0000 | [diff] [blame] | 69 | security_state = GET_SECURITY_STATE(next_bl_ep->h.attr); |
Yatharth Kochar | 7baff11 | 2015-10-09 18:06:13 +0100 | [diff] [blame] | 70 | |
| 71 | /* Setup the Secure/Non-Secure context if not done already. */ |
| 72 | if (!cm_get_context(security_state)) |
| 73 | cm_set_context(&bl1_cpu_context[security_state], security_state); |
| 74 | |
| 75 | /* Prepare the SPSR for the next BL image. */ |
| 76 | if (security_state == SECURE) { |
| 77 | next_bl_ep->spsr = SPSR_64(MODE_EL1, MODE_SP_ELX, |
| 78 | DISABLE_ALL_EXCEPTIONS); |
| 79 | } else { |
Jeenu Viswambharan | f4c8aa9 | 2017-02-21 14:40:44 +0000 | [diff] [blame] | 80 | /* Use EL2 if supported; else use EL1. */ |
Antonio Nino Diaz | a0fee74 | 2018-10-31 15:25:35 +0000 | [diff] [blame] | 81 | if (el_implemented(2) != EL_IMPL_NONE) { |
Yatharth Kochar | 7baff11 | 2015-10-09 18:06:13 +0100 | [diff] [blame] | 82 | next_bl_ep->spsr = SPSR_64(MODE_EL2, MODE_SP_ELX, |
| 83 | DISABLE_ALL_EXCEPTIONS); |
| 84 | } else { |
| 85 | next_bl_ep->spsr = SPSR_64(MODE_EL1, MODE_SP_ELX, |
| 86 | DISABLE_ALL_EXCEPTIONS); |
| 87 | } |
| 88 | } |
| 89 | |
| 90 | /* Allow platform to make change */ |
| 91 | bl1_plat_set_ep_info(image_id, next_bl_ep); |
| 92 | |
| 93 | /* Prepare the context for the next BL image. */ |
| 94 | cm_init_my_context(next_bl_ep); |
| 95 | cm_prepare_el3_exit(security_state); |
| 96 | |
| 97 | /* Indicate that image is in execution state. */ |
| 98 | image_desc->state = IMAGE_STATE_EXECUTED; |
| 99 | |
| 100 | print_entry_point_info(next_bl_ep); |
| 101 | } |