1 /* 2 * Copyright (c) 2016-2017, 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 <arm_sip_svc.h> 32 #include <debug.h> 33 #include <plat_arm.h> 34 #include <pmf.h> 35 #include <runtime_svc.h> 36 #include <stdint.h> 37 #include <uuid.h> 38 39 40 /* ARM SiP Service UUID */ 41 DEFINE_SVC_UUID(arm_sip_svc_uid, 42 0xe2756d55, 0x3360, 0x4bb5, 0xbf, 0xf3, 43 0x62, 0x79, 0xfd, 0x11, 0x37, 0xff); 44 45 static int arm_sip_setup(void) 46 { 47 if (pmf_setup() != 0) 48 return 1; 49 return 0; 50 } 51 52 /* 53 * This function handles ARM defined SiP Calls 54 */ 55 static uintptr_t arm_sip_handler(unsigned int smc_fid, 56 u_register_t x1, 57 u_register_t x2, 58 u_register_t x3, 59 u_register_t x4, 60 void *cookie, 61 void *handle, 62 u_register_t flags) 63 { 64 int call_count = 0; 65 66 /* 67 * Dispatch PMF calls to PMF SMC handler and return its return 68 * value 69 */ 70 if (is_pmf_fid(smc_fid)) { 71 return pmf_smc_handler(smc_fid, x1, x2, x3, x4, cookie, 72 handle, flags); 73 } 74 75 switch (smc_fid) { 76 case ARM_SIP_SVC_EXE_STATE_SWITCH: { 77 u_register_t pc; 78 79 /* Allow calls from non-secure only */ 80 if (!is_caller_non_secure(flags)) 81 SMC_RET1(handle, STATE_SW_E_DENIED); 82 83 /* Validate supplied entry point */ 84 pc = (u_register_t) ((x1 << 32) | (uint32_t) x2); 85 if (arm_validate_ns_entrypoint(pc)) 86 SMC_RET1(handle, STATE_SW_E_PARAM); 87 88 /* 89 * Pointers used in execution state switch are all 32 bits wide 90 */ 91 return arm_execution_state_switch(smc_fid, (uint32_t) x1, 92 (uint32_t) x2, (uint32_t) x3, (uint32_t) x4, 93 handle); 94 } 95 96 case ARM_SIP_SVC_CALL_COUNT: 97 /* PMF calls */ 98 call_count += PMF_NUM_SMC_CALLS; 99 100 /* State switch call */ 101 call_count += 1; 102 103 SMC_RET1(handle, call_count); 104 105 case ARM_SIP_SVC_UID: 106 /* Return UID to the caller */ 107 SMC_UUID_RET(handle, arm_sip_svc_uid); 108 109 case ARM_SIP_SVC_VERSION: 110 /* Return the version of current implementation */ 111 SMC_RET2(handle, ARM_SIP_SVC_VERSION_MAJOR, ARM_SIP_SVC_VERSION_MINOR); 112 113 default: 114 WARN("Unimplemented ARM SiP Service Call: 0x%x \n", smc_fid); 115 SMC_RET1(handle, SMC_UNK); 116 } 117 118 } 119 120 121 /* Define a runtime service descriptor for fast SMC calls */ 122 DECLARE_RT_SVC( 123 arm_sip_svc, 124 OEN_SIP_START, 125 OEN_SIP_END, 126 SMC_TYPE_FAST, 127 arm_sip_setup, 128 arm_sip_handler 129 ); 130