1 /*
2 * Copyright (c) 2016-2017, ARM Limited and Contributors. All rights reserved.
3 *
4 * SPDX-License-Identifier: BSD-3-Clause
5 */
6
7 #include <arm_sip_svc.h>
8 #include <debug.h>
9 #include <plat_arm.h>
10 #include <pmf.h>
11 #include <runtime_svc.h>
12 #include <stdint.h>
13 #include <uuid.h>
14
15
16 /* ARM SiP Service UUID */
17 DEFINE_SVC_UUID(arm_sip_svc_uid,
18 0xe2756d55, 0x3360, 0x4bb5, 0xbf, 0xf3,
19 0x62, 0x79, 0xfd, 0x11, 0x37, 0xff);
20
arm_sip_setup(void)21 static int arm_sip_setup(void)
22 {
23 if (pmf_setup() != 0)
24 return 1;
25 return 0;
26 }
27
28 /*
29 * This function handles ARM defined SiP Calls
30 */
arm_sip_handler(unsigned int 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)31 static uintptr_t arm_sip_handler(unsigned int smc_fid,
32 u_register_t x1,
33 u_register_t x2,
34 u_register_t x3,
35 u_register_t x4,
36 void *cookie,
37 void *handle,
38 u_register_t flags)
39 {
40 int call_count = 0;
41
42 /*
43 * Dispatch PMF calls to PMF SMC handler and return its return
44 * value
45 */
46 if (is_pmf_fid(smc_fid)) {
47 return pmf_smc_handler(smc_fid, x1, x2, x3, x4, cookie,
48 handle, flags);
49 }
50
51 switch (smc_fid) {
52 case ARM_SIP_SVC_EXE_STATE_SWITCH: {
53 u_register_t pc;
54
55 /* Allow calls from non-secure only */
56 if (!is_caller_non_secure(flags))
57 SMC_RET1(handle, STATE_SW_E_DENIED);
58
59 /* Validate supplied entry point */
60 pc = (u_register_t) ((x1 << 32) | (uint32_t) x2);
61 if (arm_validate_ns_entrypoint(pc))
62 SMC_RET1(handle, STATE_SW_E_PARAM);
63
64 /*
65 * Pointers used in execution state switch are all 32 bits wide
66 */
67 return arm_execution_state_switch(smc_fid, (uint32_t) x1,
68 (uint32_t) x2, (uint32_t) x3, (uint32_t) x4,
69 handle);
70 }
71
72 case ARM_SIP_SVC_CALL_COUNT:
73 /* PMF calls */
74 call_count += PMF_NUM_SMC_CALLS;
75
76 /* State switch call */
77 call_count += 1;
78
79 SMC_RET1(handle, call_count);
80
81 case ARM_SIP_SVC_UID:
82 /* Return UID to the caller */
83 SMC_UUID_RET(handle, arm_sip_svc_uid);
84
85 case ARM_SIP_SVC_VERSION:
86 /* Return the version of current implementation */
87 SMC_RET2(handle, ARM_SIP_SVC_VERSION_MAJOR, ARM_SIP_SVC_VERSION_MINOR);
88
89 default:
90 WARN("Unimplemented ARM SiP Service Call: 0x%x \n", smc_fid);
91 SMC_RET1(handle, SMC_UNK);
92 }
93
94 }
95
96
97 /* Define a runtime service descriptor for fast SMC calls */
98 DECLARE_RT_SVC(
99 arm_sip_svc,
100 OEN_SIP_START,
101 OEN_SIP_END,
102 SMC_TYPE_FAST,
103 arm_sip_setup,
104 arm_sip_handler
105 );
106