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 */ 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 */ 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