1 /*
2 * Copyright (c) 2014-2016, ARM Limited and Contributors. All rights reserved.
3 *
4 * SPDX-License-Identifier: BSD-3-Clause
5 */
6
7 #include <assert.h>
8 #include <cpu_data.h>
9 #include <debug.h>
10 #include <pmf.h>
11 #include <psci.h>
12 #include <runtime_instr.h>
13 #include <runtime_svc.h>
14 #include <smcc_helpers.h>
15 #include <std_svc.h>
16 #include <stdint.h>
17 #include <uuid.h>
18
19 /* Standard Service UUID */
20 DEFINE_SVC_UUID(arm_svc_uid,
21 0x108d905b, 0xf863, 0x47e8, 0xae, 0x2d,
22 0xc0, 0xfb, 0x56, 0x41, 0xf6, 0xe2);
23
24 /* Setup Standard Services */
std_svc_setup(void)25 static int32_t std_svc_setup(void)
26 {
27 uintptr_t svc_arg;
28
29 svc_arg = get_arm_std_svc_args(PSCI_FID_MASK);
30 assert(svc_arg);
31
32 /*
33 * PSCI is the only specification implemented as a Standard Service.
34 * The `psci_setup()` also does EL3 architectural setup.
35 */
36 return psci_setup((const psci_lib_args_t *)svc_arg);
37 }
38
39 /*
40 * Top-level Standard Service SMC handler. This handler will in turn dispatch
41 * calls to PSCI SMC handler
42 */
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)43 uintptr_t std_svc_smc_handler(uint32_t smc_fid,
44 u_register_t x1,
45 u_register_t x2,
46 u_register_t x3,
47 u_register_t x4,
48 void *cookie,
49 void *handle,
50 u_register_t flags)
51 {
52 /*
53 * Dispatch PSCI calls to PSCI SMC handler and return its return
54 * value
55 */
56 if (is_psci_fid(smc_fid)) {
57 uint64_t ret;
58
59 #if ENABLE_RUNTIME_INSTRUMENTATION
60
61 /*
62 * Flush cache line so that even if CPU power down happens
63 * the timestamp update is reflected in memory.
64 */
65 PMF_WRITE_TIMESTAMP(rt_instr_svc,
66 RT_INSTR_ENTER_PSCI,
67 PMF_CACHE_MAINT,
68 get_cpu_data(cpu_data_pmf_ts[CPU_DATA_PMF_TS0_IDX]));
69 #endif
70
71 ret = psci_smc_handler(smc_fid, x1, x2, x3, x4,
72 cookie, handle, flags);
73
74 #if ENABLE_RUNTIME_INSTRUMENTATION
75 PMF_CAPTURE_TIMESTAMP(rt_instr_svc,
76 RT_INSTR_EXIT_PSCI,
77 PMF_NO_CACHE_MAINT);
78 #endif
79
80 SMC_RET1(handle, ret);
81 }
82
83 switch (smc_fid) {
84 case ARM_STD_SVC_CALL_COUNT:
85 /*
86 * Return the number of Standard Service Calls. PSCI is the only
87 * standard service implemented; so return number of PSCI calls
88 */
89 SMC_RET1(handle, PSCI_NUM_CALLS);
90
91 case ARM_STD_SVC_UID:
92 /* Return UID to the caller */
93 SMC_UUID_RET(handle, arm_svc_uid);
94
95 case ARM_STD_SVC_VERSION:
96 /* Return the version of current implementation */
97 SMC_RET2(handle, STD_SVC_VERSION_MAJOR, STD_SVC_VERSION_MINOR);
98
99 default:
100 WARN("Unimplemented Standard Service Call: 0x%x \n", smc_fid);
101 SMC_RET1(handle, SMC_UNK);
102 }
103 }
104
105 /* Register Standard Service Calls as runtime service */
106 DECLARE_RT_SVC(
107 std_svc,
108
109 OEN_STD_START,
110 OEN_STD_END,
111 SMC_TYPE_FAST,
112 std_svc_setup,
113 std_svc_smc_handler
114 );
115