1 /*
2 * Copyright (c) 2015-2021, Arm Limited and Contributors. All rights reserved.
3 *
4 * SPDX-License-Identifier: BSD-3-Clause
5 */
6
7 #include <assert.h>
8
9 #include <arch_helpers.h>
10 #include <context.h>
11 #include <common/debug.h>
12 #include <lib/el3_runtime/context_mgmt.h>
13 #include <plat/common/platform.h>
14
15 #include "../bl1_private.h"
16
17 /* Following contains the cpu context pointers. */
18 static void *bl1_cpu_context_ptr[2];
19 entry_point_info_t *bl2_ep_info;
20
21
cm_get_context(uint32_t security_state)22 void *cm_get_context(uint32_t security_state)
23 {
24 assert(sec_state_is_valid(security_state));
25 return bl1_cpu_context_ptr[security_state];
26 }
27
cm_set_context(void * context,uint32_t security_state)28 void cm_set_context(void *context, uint32_t security_state)
29 {
30 assert(sec_state_is_valid(security_state));
31 bl1_cpu_context_ptr[security_state] = context;
32 }
33
34 #if ENABLE_RME
35 /*******************************************************************************
36 * This function prepares the entry point information to run BL2 in Root world,
37 * i.e. EL3, for the case when FEAT_RME is enabled.
38 ******************************************************************************/
bl1_prepare_next_image(unsigned int image_id)39 void bl1_prepare_next_image(unsigned int image_id)
40 {
41 image_desc_t *bl2_desc;
42
43 assert(image_id == BL2_IMAGE_ID);
44
45 /* Get the image descriptor. */
46 bl2_desc = bl1_plat_get_image_desc(BL2_IMAGE_ID);
47 assert(bl2_desc != NULL);
48
49 /* Get the entry point info. */
50 bl2_ep_info = &bl2_desc->ep_info;
51
52 bl2_ep_info->spsr = (uint32_t)SPSR_64(MODE_EL3, MODE_SP_ELX,
53 DISABLE_ALL_EXCEPTIONS);
54
55 /*
56 * Flush cache since bl2_ep_info is accessed after MMU is disabled
57 * before jumping to BL2.
58 */
59 flush_dcache_range((uintptr_t)bl2_ep_info, sizeof(entry_point_info_t));
60
61 /* Indicate that image is in execution state. */
62 bl2_desc->state = IMAGE_STATE_EXECUTED;
63
64 /* Print debug info and flush the console before running BL2. */
65 print_entry_point_info(bl2_ep_info);
66 }
67 #else
68 /*******************************************************************************
69 * This function prepares the context for Secure/Normal world images.
70 * Normal world images are transitioned to EL2(if supported) else EL1.
71 ******************************************************************************/
bl1_prepare_next_image(unsigned int image_id)72 void bl1_prepare_next_image(unsigned int image_id)
73 {
74
75 /*
76 * Following array will be used for context management.
77 * There are 2 instances, for the Secure and Non-Secure contexts.
78 */
79 static cpu_context_t bl1_cpu_context[2];
80
81 unsigned int security_state, mode = MODE_EL1;
82 image_desc_t *desc;
83 entry_point_info_t *next_bl_ep;
84
85 #if CTX_INCLUDE_AARCH32_REGS
86 /*
87 * Ensure that the build flag to save AArch32 system registers in CPU
88 * context is not set for AArch64-only platforms.
89 */
90 if (el_implemented(1) == EL_IMPL_A64ONLY) {
91 ERROR("EL1 supports AArch64-only. Please set build flag "
92 "CTX_INCLUDE_AARCH32_REGS = 0\n");
93 panic();
94 }
95 #endif
96
97 /* Get the image descriptor. */
98 desc = bl1_plat_get_image_desc(image_id);
99 assert(desc != NULL);
100
101 /* Get the entry point info. */
102 next_bl_ep = &desc->ep_info;
103
104 /* Get the image security state. */
105 security_state = GET_SECURITY_STATE(next_bl_ep->h.attr);
106
107 /* Setup the Secure/Non-Secure context if not done already. */
108 if (cm_get_context(security_state) == NULL)
109 cm_set_context(&bl1_cpu_context[security_state], security_state);
110
111 /* Prepare the SPSR for the next BL image. */
112 if ((security_state != SECURE) && (el_implemented(2) != EL_IMPL_NONE)) {
113 mode = MODE_EL2;
114 }
115
116 next_bl_ep->spsr = (uint32_t)SPSR_64((uint64_t) mode,
117 (uint64_t)MODE_SP_ELX, DISABLE_ALL_EXCEPTIONS);
118
119 /* Allow platform to make change */
120 bl1_plat_set_ep_info(image_id, next_bl_ep);
121
122 /* Prepare the context for the next BL image. */
123 cm_init_my_context(next_bl_ep);
124 cm_prepare_el3_exit(security_state);
125
126 /* Indicate that image is in execution state. */
127 desc->state = IMAGE_STATE_EXECUTED;
128
129 print_entry_point_info(next_bl_ep);
130 }
131 #endif /* ENABLE_RME */
132