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Yatharth Kochara65be2f2015-10-09 18:06:13 +01001/*
Yatharth Kocharf11b29a2016-02-01 11:04:46 +00002 * Copyright (c) 2015-2016, ARM Limited and Contributors. All rights reserved.
Yatharth Kochara65be2f2015-10-09 18:06:13 +01003 *
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
31#include <arch_helpers.h>
32#include <assert.h>
33#include <context.h>
34#include <context_mgmt.h>
Yatharth Kochara65be2f2015-10-09 18:06:13 +010035#include <platform.h>
36
37/*
38 * Following array will be used for context management.
39 * There are 2 instances, for the Secure and Non-Secure contexts.
40 */
41static cpu_context_t bl1_cpu_context[2];
42
43/* Following contains the cpu context pointers. */
44static void *bl1_cpu_context_ptr[2];
45
46
47void *cm_get_context(uint32_t security_state)
48{
49 assert(sec_state_is_valid(security_state));
50 return bl1_cpu_context_ptr[security_state];
51}
52
53void cm_set_context(void *context, uint32_t security_state)
54{
55 assert(sec_state_is_valid(security_state));
56 bl1_cpu_context_ptr[security_state] = context;
57}
58
59/*******************************************************************************
60 * This function prepares the context for Secure/Normal world images.
61 * Normal world images are transitioned to EL2(if supported) else EL1.
62 ******************************************************************************/
63void bl1_prepare_next_image(unsigned int image_id)
64{
65 unsigned int security_state;
66 image_desc_t *image_desc;
67 entry_point_info_t *next_bl_ep;
68
69 /* Get the image descriptor. */
70 image_desc = bl1_plat_get_image_desc(image_id);
71 assert(image_desc);
72
73 /* Get the entry point info. */
74 next_bl_ep = &image_desc->ep_info;
75
76 /* Get the image security state. */
Yatharth Kocharf11b29a2016-02-01 11:04:46 +000077 security_state = GET_SECURITY_STATE(next_bl_ep->h.attr);
Yatharth Kochara65be2f2015-10-09 18:06:13 +010078
79 /* Setup the Secure/Non-Secure context if not done already. */
80 if (!cm_get_context(security_state))
81 cm_set_context(&bl1_cpu_context[security_state], security_state);
82
83 /* Prepare the SPSR for the next BL image. */
84 if (security_state == SECURE) {
85 next_bl_ep->spsr = SPSR_64(MODE_EL1, MODE_SP_ELX,
86 DISABLE_ALL_EXCEPTIONS);
87 } else {
88 /* Use EL2 if supported else use EL1. */
89 if (read_id_aa64pfr0_el1() &
90 (ID_AA64PFR0_ELX_MASK << ID_AA64PFR0_EL2_SHIFT)) {
91 next_bl_ep->spsr = SPSR_64(MODE_EL2, MODE_SP_ELX,
92 DISABLE_ALL_EXCEPTIONS);
93 } else {
94 next_bl_ep->spsr = SPSR_64(MODE_EL1, MODE_SP_ELX,
95 DISABLE_ALL_EXCEPTIONS);
96 }
97 }
98
99 /* Allow platform to make change */
100 bl1_plat_set_ep_info(image_id, next_bl_ep);
101
102 /* Prepare the context for the next BL image. */
103 cm_init_my_context(next_bl_ep);
104 cm_prepare_el3_exit(security_state);
105
106 /* Indicate that image is in execution state. */
107 image_desc->state = IMAGE_STATE_EXECUTED;
108
109 print_entry_point_info(next_bl_ep);
110}