1 /*
2 * Copyright (c) 2014-2019, ARM Limited and Contributors. All rights reserved.
3 *
4 * SPDX-License-Identifier: BSD-3-Clause
5 */
6
7 #include <assert.h>
8 #include <stdint.h>
9
10 #include <common/debug.h>
11 #include <common/runtime_svc.h>
12 #include <lib/el3_runtime/cpu_data.h>
13 #include <lib/pmf/pmf.h>
14 #include <lib/psci/psci.h>
15 #include <lib/runtime_instr.h>
16 #include <services/sdei.h>
17 #include <services/spm_mm_svc.h>
18 #include <services/std_svc.h>
19 #include <smccc_helpers.h>
20 #include <tools_share/uuid.h>
21
22 /* Standard Service UUID */
23 static uuid_t arm_svc_uid = {
24 {0x5b, 0x90, 0x8d, 0x10},
25 {0x63, 0xf8},
26 {0xe8, 0x47},
27 0xae, 0x2d,
28 {0xc0, 0xfb, 0x56, 0x41, 0xf6, 0xe2}
29 };
30
31 /* Setup Standard Services */
std_svc_setup(void)32 static int32_t std_svc_setup(void)
33 {
34 uintptr_t svc_arg;
35 int ret = 0;
36
37 svc_arg = get_arm_std_svc_args(PSCI_FID_MASK);
38 assert(svc_arg);
39
40 /*
41 * PSCI is one of the specifications implemented as a Standard Service.
42 * The `psci_setup()` also does EL3 architectural setup.
43 */
44 if (psci_setup((const psci_lib_args_t *)svc_arg) != PSCI_E_SUCCESS) {
45 ret = 1;
46 }
47
48 #if SPM_MM
49 if (spm_mm_setup() != 0) {
50 ret = 1;
51 }
52 #endif
53
54 #if SDEI_SUPPORT
55 /* SDEI initialisation */
56 sdei_init();
57 #endif
58
59 return ret;
60 }
61
62 /*
63 * Top-level Standard Service SMC handler. This handler will in turn dispatch
64 * calls to PSCI SMC handler
65 */
std_svc_smc_handler(uint32_t smc_fid,u_register_t x1,u_register_t x2,u_register_t x3,u_register_t x4,void * cookie,void * handle,u_register_t flags)66 static uintptr_t std_svc_smc_handler(uint32_t smc_fid,
67 u_register_t x1,
68 u_register_t x2,
69 u_register_t x3,
70 u_register_t x4,
71 void *cookie,
72 void *handle,
73 u_register_t flags)
74 {
75 /*
76 * Dispatch PSCI calls to PSCI SMC handler and return its return
77 * value
78 */
79 if (is_psci_fid(smc_fid)) {
80 uint64_t ret;
81
82 #if ENABLE_RUNTIME_INSTRUMENTATION
83
84 /*
85 * Flush cache line so that even if CPU power down happens
86 * the timestamp update is reflected in memory.
87 */
88 PMF_WRITE_TIMESTAMP(rt_instr_svc,
89 RT_INSTR_ENTER_PSCI,
90 PMF_CACHE_MAINT,
91 get_cpu_data(cpu_data_pmf_ts[CPU_DATA_PMF_TS0_IDX]));
92 #endif
93
94 ret = psci_smc_handler(smc_fid, x1, x2, x3, x4,
95 cookie, handle, flags);
96
97 #if ENABLE_RUNTIME_INSTRUMENTATION
98 PMF_CAPTURE_TIMESTAMP(rt_instr_svc,
99 RT_INSTR_EXIT_PSCI,
100 PMF_NO_CACHE_MAINT);
101 #endif
102
103 SMC_RET1(handle, ret);
104 }
105
106 #if SPM_MM
107 /*
108 * Dispatch SPM calls to SPM SMC handler and return its return
109 * value
110 */
111 if (is_spm_mm_fid(smc_fid)) {
112 return spm_mm_smc_handler(smc_fid, x1, x2, x3, x4, cookie,
113 handle, flags);
114 }
115 #endif
116
117 #if SDEI_SUPPORT
118 if (is_sdei_fid(smc_fid)) {
119 return sdei_smc_handler(smc_fid, x1, x2, x3, x4, cookie, handle,
120 flags);
121 }
122 #endif
123
124 switch (smc_fid) {
125 case ARM_STD_SVC_CALL_COUNT:
126 /*
127 * Return the number of Standard Service Calls. PSCI is the only
128 * standard service implemented; so return number of PSCI calls
129 */
130 SMC_RET1(handle, PSCI_NUM_CALLS);
131
132 case ARM_STD_SVC_UID:
133 /* Return UID to the caller */
134 SMC_UUID_RET(handle, arm_svc_uid);
135
136 case ARM_STD_SVC_VERSION:
137 /* Return the version of current implementation */
138 SMC_RET2(handle, STD_SVC_VERSION_MAJOR, STD_SVC_VERSION_MINOR);
139
140 default:
141 WARN("Unimplemented Standard Service Call: 0x%x \n", smc_fid);
142 SMC_RET1(handle, SMC_UNK);
143 }
144 }
145
146 /* Register Standard Service Calls as runtime service */
147 DECLARE_RT_SVC(
148 std_svc,
149
150 OEN_STD_START,
151 OEN_STD_END,
152 SMC_TYPE_FAST,
153 std_svc_setup,
154 std_svc_smc_handler
155 );
156