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Achin Gupta4f6ad662013-10-25 09:08:21 +01001/*
Dan Handleye83b0ca2014-01-14 18:17:09 +00002 * Copyright (c) 2013-2014, ARM Limited and Contributors. All rights reserved.
Achin Gupta4f6ad662013-10-25 09:08:21 +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 <stdio.h>
32#include <string.h>
33#include <errno.h>
34#include <assert.h>
35#include <arch_helpers.h>
36#include <console.h>
37#include <platform.h>
38#include <semihosting.h>
39#include <bl_common.h>
40#include <psci.h>
Achin Guptac8afc782013-11-25 18:45:02 +000041#include <runtime_svc.h>
Achin Gupta07f4e072014-02-02 12:02:23 +000042#include <context.h>
Achin Gupta7421b462014-02-01 18:53:26 +000043#include <debug.h>
Jeenu Viswambharancaa84932014-02-06 10:36:15 +000044#include <context_mgmt.h>
Achin Gupta4f6ad662013-10-25 09:08:21 +010045
46/*******************************************************************************
Achin Gupta7421b462014-02-01 18:53:26 +000047 * The 'rt_svc_descs' array holds the runtime service descriptors exported by
48 * services by placing them in the 'rt_svc_descs' linker section.
49 * The 'rt_svc_descs_indices' array holds the index of a descriptor in the
50 * 'rt_svc_descs' array. When an SMC arrives, the OEN[29:24] bits and the call
51 * type[31] bit in the function id are combined to get an index into the
52 * 'rt_svc_descs_indices' array. This gives the index of the descriptor in the
53 * 'rt_svc_descs' array which contains the SMC handler.
Achin Gupta4f6ad662013-10-25 09:08:21 +010054 ******************************************************************************/
Achin Gupta7421b462014-02-01 18:53:26 +000055#define RT_SVC_DESCS_START ((uint64_t) (&__RT_SVC_DESCS_START__))
56#define RT_SVC_DESCS_END ((uint64_t) (&__RT_SVC_DESCS_END__))
57uint8_t rt_svc_descs_indices[MAX_RT_SVCS];
58static rt_svc_desc *rt_svc_descs;
59
60/*******************************************************************************
61 * Simple routine to sanity check a runtime service descriptor before using it
62 ******************************************************************************/
63static int32_t validate_rt_svc_desc(rt_svc_desc *desc)
Achin Gupta4f6ad662013-10-25 09:08:21 +010064{
Achin Gupta7421b462014-02-01 18:53:26 +000065 if (desc == NULL)
66 return -EINVAL;
67
68 if (desc->start_oen > desc->end_oen)
69 return -EINVAL;
70
71 if (desc->end_oen >= OEN_LIMIT)
72 return -EINVAL;
73
74 if (desc->call_type != SMC_TYPE_FAST && desc->call_type != SMC_TYPE_STD)
75 return -EINVAL;
76
77 /* A runtime service having no init or handle function doesn't make sense */
78 if (desc->init == NULL && desc->handle == NULL)
79 return -EINVAL;
80
81 return 0;
82}
83
84/*******************************************************************************
85 * This function calls the initialisation routine in the descriptor exported by
86 * a runtime service. Once a descriptor has been validated, its start & end
87 * owning entity numbers and the call type are combined to form a unique oen.
88 * The unique oen is used as an index into the 'rt_svc_descs_indices' array.
89 * The index of the runtime service descriptor is stored at this index.
90 ******************************************************************************/
91void runtime_svc_init()
92{
93 int32_t rc = 0;
94 uint32_t index, start_idx, end_idx;
95 uint64_t rt_svc_descs_num;
96
97 /* If no runtime services are implemented then simply bail out */
98 rt_svc_descs_num = RT_SVC_DESCS_END - RT_SVC_DESCS_START;
99 rt_svc_descs_num /= sizeof(rt_svc_desc);
100 if (rt_svc_descs_num == 0)
101 return;
102
103 /* Initialise internal variables to invalid state */
104 memset(rt_svc_descs_indices, -1, sizeof(rt_svc_descs_indices));
105
106 rt_svc_descs = (rt_svc_desc *) RT_SVC_DESCS_START;
107 for (index = 0; index < rt_svc_descs_num; index++) {
108
109 /*
110 * An invalid descriptor is an error condition since it is
111 * difficult to predict the system behaviour in the absence
112 * of this service.
113 */
114 rc = validate_rt_svc_desc(&rt_svc_descs[index]);
115 if (rc) {
116 ERROR("Invalid runtime service descriptor 0x%x (%s)\n",
117 &rt_svc_descs[index],
118 rt_svc_descs[index].name);
119 goto error;
120 }
121
122 /*
123 * Fill the indices corresponding to the start and end owning
124 * entity numbers with the index of the descriptor which will
125 * handle the SMCs for this owning entity range.
126 */
127 start_idx = get_unique_oen(rt_svc_descs[index].start_oen,
128 rt_svc_descs[index].call_type);
129 end_idx = get_unique_oen(rt_svc_descs[index].end_oen,
130 rt_svc_descs[index].call_type);
131 for (; start_idx <= end_idx; start_idx++)
132 rt_svc_descs_indices[start_idx] = index;
133
134 /* Call the initialisation routine for this runtime service */
135 rc = rt_svc_descs[index].init();
136 if (rc) {
137 ERROR("Error initializing runtime service %s\n",
138 rt_svc_descs[index].name);
139 goto error;
140 }
141 }
142
Achin Gupta4f6ad662013-10-25 09:08:21 +0100143 return;
Achin Gupta7421b462014-02-01 18:53:26 +0000144error:
145 panic();
Achin Gupta4f6ad662013-10-25 09:08:21 +0100146}
Achin Gupta07f4e072014-02-02 12:02:23 +0000147
148void fault_handler(void *handle)
149{
Jeenu Viswambharancaa84932014-02-06 10:36:15 +0000150 gp_regs *gpregs_ctx = get_gpregs_ctx(handle);
Achin Gupta07f4e072014-02-02 12:02:23 +0000151 ERROR("Unhandled synchronous fault. Register dump @ 0x%x \n",
152 gpregs_ctx);
153 panic();
154}