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