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 <debug.h> 32 #include <psci.h> 33 #include <runtime_svc.h> 34 #include <smcc_helpers.h> 35 #include <std_svc.h> 36 #include <stdint.h> 37 #include <uuid.h> 38 39 /* Standard Service UUID */ 40 DEFINE_SVC_UUID(arm_svc_uid, 41 0x108d905b, 0xf863, 0x47e8, 0xae, 0x2d, 42 0xc0, 0xfb, 0x56, 0x41, 0xf6, 0xe2); 43 44 /* 45 * Top-level Standard Service SMC handler. This handler will in turn dispatch 46 * calls to PSCI SMC handler 47 */ 48 uintptr_t std_svc_smc_handler(uint32_t smc_fid, 49 u_register_t x1, 50 u_register_t x2, 51 u_register_t x3, 52 u_register_t x4, 53 void *cookie, 54 void *handle, 55 u_register_t flags) 56 { 57 /* 58 * Dispatch PSCI calls to PSCI SMC handler and return its return 59 * value 60 */ 61 if (is_psci_fid(smc_fid)) { 62 SMC_RET1(handle, 63 psci_smc_handler(smc_fid, x1, x2, x3, x4, 64 cookie, handle, flags)); 65 } 66 67 switch (smc_fid) { 68 case ARM_STD_SVC_CALL_COUNT: 69 /* 70 * Return the number of Standard Service Calls. PSCI is the only 71 * standard service implemented; so return number of PSCI calls 72 */ 73 SMC_RET1(handle, PSCI_NUM_CALLS); 74 75 case ARM_STD_SVC_UID: 76 /* Return UID to the caller */ 77 SMC_UUID_RET(handle, arm_svc_uid); 78 79 case ARM_STD_SVC_VERSION: 80 /* Return the version of current implementation */ 81 SMC_RET2(handle, STD_SVC_VERSION_MAJOR, STD_SVC_VERSION_MINOR); 82 83 default: 84 WARN("Unimplemented Standard Service Call: 0x%x \n", smc_fid); 85 SMC_RET1(handle, SMC_UNK); 86 } 87 } 88 89 /* Register Standard Service Calls as runtime service */ 90 DECLARE_RT_SVC( 91 std_svc, 92 93 OEN_STD_START, 94 OEN_STD_END, 95 SMC_TYPE_FAST, 96 NULL, 97 std_svc_smc_handler 98 ); 99