1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
/*
* Copyright (c) 2013-2014, ARM Limited and Contributors. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of ARM nor the names of its contributors may be used
* to endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <debug.h>
#include <errno.h>
#include <runtime_svc.h>
#include <string.h>
/*******************************************************************************
* The 'rt_svc_descs' array holds the runtime service descriptors exported by
* services by placing them in the 'rt_svc_descs' linker section.
* The 'rt_svc_descs_indices' array holds the index of a descriptor in the
* 'rt_svc_descs' array. When an SMC arrives, the OEN[29:24] bits and the call
* type[31] bit in the function id are combined to get an index into the
* 'rt_svc_descs_indices' array. This gives the index of the descriptor in the
* 'rt_svc_descs' array which contains the SMC handler.
******************************************************************************/
#define RT_SVC_DESCS_START ((uint64_t) (&__RT_SVC_DESCS_START__))
#define RT_SVC_DESCS_END ((uint64_t) (&__RT_SVC_DESCS_END__))
uint8_t rt_svc_descs_indices[MAX_RT_SVCS];
static rt_svc_desc_t *rt_svc_descs;
/*******************************************************************************
* Simple routine to sanity check a runtime service descriptor before using it
******************************************************************************/
static int32_t validate_rt_svc_desc(rt_svc_desc_t *desc)
{
if (desc == NULL)
return -EINVAL;
if (desc->start_oen > desc->end_oen)
return -EINVAL;
if (desc->end_oen >= OEN_LIMIT)
return -EINVAL;
if (desc->call_type != SMC_TYPE_FAST && desc->call_type != SMC_TYPE_STD)
return -EINVAL;
/* A runtime service having no init or handle function doesn't make sense */
if (desc->init == NULL && desc->handle == NULL)
return -EINVAL;
return 0;
}
/*******************************************************************************
* This function calls the initialisation routine in the descriptor exported by
* a runtime service. Once a descriptor has been validated, its start & end
* owning entity numbers and the call type are combined to form a unique oen.
* The unique oen is used as an index into the 'rt_svc_descs_indices' array.
* The index of the runtime service descriptor is stored at this index.
******************************************************************************/
void runtime_svc_init()
{
int32_t rc = 0;
uint32_t index, start_idx, end_idx;
uint64_t rt_svc_descs_num;
/* If no runtime services are implemented then simply bail out */
rt_svc_descs_num = RT_SVC_DESCS_END - RT_SVC_DESCS_START;
rt_svc_descs_num /= sizeof(rt_svc_desc_t);
if (rt_svc_descs_num == 0)
return;
/* Initialise internal variables to invalid state */
memset(rt_svc_descs_indices, -1, sizeof(rt_svc_descs_indices));
rt_svc_descs = (rt_svc_desc_t *) RT_SVC_DESCS_START;
for (index = 0; index < rt_svc_descs_num; index++) {
/*
* An invalid descriptor is an error condition since it is
* difficult to predict the system behaviour in the absence
* of this service.
*/
rc = validate_rt_svc_desc(&rt_svc_descs[index]);
if (rc) {
ERROR("Invalid runtime service descriptor 0x%x (%s)\n",
&rt_svc_descs[index],
rt_svc_descs[index].name);
goto error;
}
/*
* The runtime service may have seperate rt_svc_desc_t
* for its fast smc and standard smc. Since the service itself
* need to be initialized only once, only one of them will have
* an initialisation routine defined. Call the initialisation
* routine for this runtime service, if it is defined.
*/
if (rt_svc_descs[index].init) {
rc = rt_svc_descs[index].init();
if (rc) {
ERROR("Error initializing runtime service %s\n",
rt_svc_descs[index].name);
continue;
}
}
/*
* Fill the indices corresponding to the start and end
* owning entity numbers with the index of the
* descriptor which will handle the SMCs for this owning
* entity range.
*/
start_idx = get_unique_oen(rt_svc_descs[index].start_oen,
rt_svc_descs[index].call_type);
end_idx = get_unique_oen(rt_svc_descs[index].end_oen,
rt_svc_descs[index].call_type);
for (; start_idx <= end_idx; start_idx++)
rt_svc_descs_indices[start_idx] = index;
}
return;
error:
panic();
}