spd: trusty: allow clients to retrieve service UUID
This patch implements support for the 64-bit and 32-bit versions of
0xBF00FF01 SMC function ID, as documented by the SMCCC, to allow
non-secure world clients to query SPD's UUID.
In order to service this FID, the Trusty SPD now increases the range
of SMCs that it services. To restrict Trusty from receiving the extra
SMC FIDs, this patch drops any unsupported FID.
Verified with TFTF tests for UID query and internal gtest for Trusty.
Change-Id: If96fe4993f7e641595cfe67cc6b4210a0d52403f
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>
diff --git a/services/spd/trusty/smcall.h b/services/spd/trusty/smcall.h
index 9c1c38c..c66f7db 100644
--- a/services/spd/trusty/smcall.h
+++ b/services/spd/trusty/smcall.h
@@ -1,5 +1,6 @@
/*
* Copyright (c) 2016-2017, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2020, NVIDIA Corporation. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@@ -71,4 +72,11 @@
#define SMC_YC_VDEV_KICK_VQ SMC_YIELDCALL_NR(SMC_ENTITY_TRUSTED_OS, 24U)
#define SMC_YC_SET_ROT_PARAMS SMC_YIELDCALL_NR(SMC_ENTITY_TRUSTED_OS, 65535U)
+/*
+ * Standard Trusted OS Function IDs that fall under Trusted OS call range
+ * according to SMC calling convention
+ */
+#define SMC_FC64_GET_UUID SMC_FASTCALL64_NR(63U, 0xFF01U) /* Implementation UID */
+#define SMC_FC_GET_UUID SMC_FASTCALL_NR(63U, 0xFF01U) /* Implementation.UID */
+
#endif /* SMCALL_H */
diff --git a/services/spd/trusty/trusty.c b/services/spd/trusty/trusty.c
index b10da76..e102b82 100644
--- a/services/spd/trusty/trusty.c
+++ b/services/spd/trusty/trusty.c
@@ -1,5 +1,6 @@
/*
* Copyright (c) 2016-2019, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2020, NVIDIA Corporation. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@@ -16,11 +17,18 @@
#include <common/debug.h>
#include <common/runtime_svc.h>
#include <lib/el3_runtime/context_mgmt.h>
+#include <lib/smccc.h>
#include <plat/common/platform.h>
+#include <tools_share/uuid.h>
#include "sm_err.h"
#include "smcall.h"
+/* Trusty UID: RFC-4122 compliant UUID version 4 */
+DEFINE_SVC_UUID2(trusty_uuid,
+ 0x40ee25f0, 0xa2bc, 0x304c, 0x8c, 0x4c,
+ 0xa1, 0x73, 0xc5, 0x7d, 0x8a, 0xf1);
+
/* macro to check if Hypervisor is enabled in the HCR_EL2 register */
#define HYP_ENABLE_FLAG 0x286001U
@@ -256,6 +264,11 @@
SMC_RET1(handle, SMC_UNK);
} else {
switch (smc_fid) {
+ case SMC_FC64_GET_UUID:
+ case SMC_FC_GET_UUID:
+ /* provide the UUID for the service to the client */
+ SMC_UUID_RET(handle, trusty_uuid);
+ break;
case SMC_FC64_SET_FIQ_HANDLER:
return trusty_set_fiq_handler(handle, x1, x2, x3);
case SMC_FC64_GET_FIQ_REGS:
@@ -263,6 +276,12 @@
case SMC_FC_FIQ_EXIT:
return trusty_fiq_exit(handle, x1, x2, x3);
default:
+ /* Not all OENs greater than SMC_ENTITY_SECURE_MONITOR are supported */
+ if (SMC_ENTITY(smc_fid) > SMC_ENTITY_SECURE_MONITOR) {
+ VERBOSE("%s: unsupported SMC FID (0x%x)\n", __func__, smc_fid);
+ SMC_RET1(handle, SMC_UNK);
+ }
+
if (is_hypervisor_mode())
vmid = SMC_GET_GP(handle, CTX_GPREG_X7);
@@ -502,7 +521,7 @@
trusty_fast,
OEN_TOS_START,
- SMC_ENTITY_SECURE_MONITOR,
+ OEN_TOS_END,
SMC_TYPE_FAST,
trusty_setup,
trusty_smc_handler