1 /* 2 * Copyright (c) 2014-2016, ARM Limited and Contributors. All rights reserved. 3 * 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 <assert.h> 32 #include <cpu_data.h> 33 #include <debug.h> 34 #include <pmf.h> 35 #include <psci.h> 36 #include <runtime_instr.h> 37 #include <runtime_svc.h> 38 #include <smcc_helpers.h> 39 #include <std_svc.h> 40 #include <stdint.h> 41 #include <uuid.h> 42 43 /* Standard Service UUID */ 44 DEFINE_SVC_UUID(arm_svc_uid, 45 0x108d905b, 0xf863, 0x47e8, 0xae, 0x2d, 46 0xc0, 0xfb, 0x56, 0x41, 0xf6, 0xe2); 47 48 /* Setup Standard Services */ 49 static int32_t std_svc_setup(void) 50 { 51 uintptr_t svc_arg; 52 53 svc_arg = get_arm_std_svc_args(PSCI_FID_MASK); 54 assert(svc_arg); 55 56 /* 57 * PSCI is the only specification implemented as a Standard Service. 58 * The `psci_setup()` also does EL3 architectural setup. 59 */ 60 return psci_setup((const psci_lib_args_t *)svc_arg); 61 } 62 63 /* 64 * Top-level Standard Service SMC handler. This handler will in turn dispatch 65 * calls to PSCI SMC handler 66 */ 67 uintptr_t std_svc_smc_handler(uint32_t smc_fid, 68 u_register_t x1, 69 u_register_t x2, 70 u_register_t x3, 71 u_register_t x4, 72 void *cookie, 73 void *handle, 74 u_register_t flags) 75 { 76 /* 77 * Dispatch PSCI calls to PSCI SMC handler and return its return 78 * value 79 */ 80 if (is_psci_fid(smc_fid)) { 81 uint64_t ret; 82 83 #if ENABLE_RUNTIME_INSTRUMENTATION 84 PMF_WRITE_TIMESTAMP(rt_instr_svc, 85 RT_INSTR_ENTER_PSCI, 86 PMF_NO_CACHE_MAINT, 87 get_cpu_data(cpu_data_pmf_ts[CPU_DATA_PMF_TS0_IDX])); 88 #endif 89 90 ret = psci_smc_handler(smc_fid, x1, x2, x3, x4, 91 cookie, handle, flags); 92 93 #if ENABLE_RUNTIME_INSTRUMENTATION 94 PMF_CAPTURE_TIMESTAMP(rt_instr_svc, 95 RT_INSTR_EXIT_PSCI, 96 PMF_NO_CACHE_MAINT); 97 #endif 98 99 SMC_RET1(handle, ret); 100 } 101 102 switch (smc_fid) { 103 case ARM_STD_SVC_CALL_COUNT: 104 /* 105 * Return the number of Standard Service Calls. PSCI is the only 106 * standard service implemented; so return number of PSCI calls 107 */ 108 SMC_RET1(handle, PSCI_NUM_CALLS); 109 110 case ARM_STD_SVC_UID: 111 /* Return UID to the caller */ 112 SMC_UUID_RET(handle, arm_svc_uid); 113 114 case ARM_STD_SVC_VERSION: 115 /* Return the version of current implementation */ 116 SMC_RET2(handle, STD_SVC_VERSION_MAJOR, STD_SVC_VERSION_MINOR); 117 118 default: 119 WARN("Unimplemented Standard Service Call: 0x%x \n", smc_fid); 120 SMC_RET1(handle, SMC_UNK); 121 } 122 } 123 124 /* Register Standard Service Calls as runtime service */ 125 DECLARE_RT_SVC( 126 std_svc, 127 128 OEN_STD_START, 129 OEN_STD_END, 130 SMC_TYPE_FAST, 131 std_svc_setup, 132 std_svc_smc_handler 133 ); 134