Module Name: src
Committed By: jmcneill
Date: Fri Aug 6 19:38:54 UTC 2021
Modified Files:
src/sys/arch/aarch64/conf: files.aarch64
src/sys/arch/arm/acpi: acpi_platform.c
src/sys/arch/arm/arm: psci.c psci.h
src/sys/arch/arm/conf: files.arm
src/sys/arch/arm/fdt: psci_fdt.c
Added Files:
src/sys/arch/arm/arm: smccc.c smccc.h
Log Message:
Arm: Add support for SMC Calling Convention
Arm DEN0028 defines a calling mechanism used with Secure Monitor Call (SMC)
and Hypervisor Call (HVC) instructions. To discover SMCCC, we must:
1) Find the PSCI conduit (either via ACPI FADT, or Device Tree)
2) Use PSCI_VERSION to determine whether PSCI_FEATURES is supported
3) Call PSCI_FEATURES with SMCCC_VERSION to determine the implementation
version.
To generate a diff of this commit:
cvs rdiff -u -r1.31 -r1.32 src/sys/arch/aarch64/conf/files.aarch64
cvs rdiff -u -r1.26 -r1.27 src/sys/arch/arm/acpi/acpi_platform.c
cvs rdiff -u -r1.5 -r1.6 src/sys/arch/arm/arm/psci.c
cvs rdiff -u -r1.2 -r1.3 src/sys/arch/arm/arm/psci.h
cvs rdiff -u -r0 -r1.1 src/sys/arch/arm/arm/smccc.c \
src/sys/arch/arm/arm/smccc.h
cvs rdiff -u -r1.164 -r1.165 src/sys/arch/arm/conf/files.arm
cvs rdiff -u -r1.20 -r1.21 src/sys/arch/arm/fdt/psci_fdt.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/arch/aarch64/conf/files.aarch64
diff -u src/sys/arch/aarch64/conf/files.aarch64:1.31 src/sys/arch/aarch64/conf/files.aarch64:1.32
--- src/sys/arch/aarch64/conf/files.aarch64:1.31 Sat Jul 24 23:38:41 2021
+++ src/sys/arch/aarch64/conf/files.aarch64 Fri Aug 6 19:38:53 2021
@@ -1,4 +1,4 @@
-# $NetBSD: files.aarch64,v 1.31 2021/07/24 23:38:41 jmcneill Exp $
+# $NetBSD: files.aarch64,v 1.32 2021/08/06 19:38:53 jmcneill Exp $
defflag opt_cpuoptions.h AARCH64_ALIGNMENT_CHECK
defflag opt_cpuoptions.h AARCH64_EL0_STACK_ALIGNMENT_CHECK
@@ -33,11 +33,15 @@ defparam opt_console.h CONSPEED
defparam opt_console.h CONMODE
defparam opt_console.h CONADDR
-# Power State Coordination Interface (PSCI)
# FP support
file arch/aarch64/aarch64/fpu.c
-device psci
+# SMC Calling Convention
+define smccc
+file arch/arm/arm/smccc.c smccc
+
+# Power State Coordination Interface (PSCI)
+device psci: smccc
file arch/arm/arm/psci.c psci
file arch/arm/arm/psci_arm.S psci
Index: src/sys/arch/arm/acpi/acpi_platform.c
diff -u src/sys/arch/arm/acpi/acpi_platform.c:1.26 src/sys/arch/arm/acpi/acpi_platform.c:1.27
--- src/sys/arch/arm/acpi/acpi_platform.c:1.26 Wed May 12 23:22:32 2021
+++ src/sys/arch/arm/acpi/acpi_platform.c Fri Aug 6 19:38:53 2021
@@ -1,4 +1,4 @@
-/* $NetBSD: acpi_platform.c,v 1.26 2021/05/12 23:22:32 thorpej Exp $ */
+/* $NetBSD: acpi_platform.c,v 1.27 2021/08/06 19:38:53 jmcneill Exp $ */
/*-
* Copyright (c) 2018 The NetBSD Foundation, Inc.
@@ -35,7 +35,7 @@
#include "opt_multiprocessor.h"
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: acpi_platform.c,v 1.26 2021/05/12 23:22:32 thorpej Exp $");
+__KERNEL_RCSID(0, "$NetBSD: acpi_platform.c,v 1.27 2021/08/06 19:38:53 jmcneill Exp $");
#include <sys/param.h>
#include <sys/bus.h>
@@ -55,6 +55,7 @@ __KERNEL_RCSID(0, "$NetBSD: acpi_platfor
#include <arm/cortex/gtmr_var.h>
+#include <arm/arm/smccc.h>
#include <arm/arm/psci.h>
#include <arm/fdt/psci_fdtvar.h>
Index: src/sys/arch/arm/arm/psci.c
diff -u src/sys/arch/arm/arm/psci.c:1.5 src/sys/arch/arm/arm/psci.c:1.6
--- src/sys/arch/arm/arm/psci.c:1.5 Sat Jan 16 23:51:50 2021
+++ src/sys/arch/arm/arm/psci.c Fri Aug 6 19:38:53 2021
@@ -1,4 +1,4 @@
-/* $NetBSD: psci.c,v 1.5 2021/01/16 23:51:50 chs Exp $ */
+/* $NetBSD: psci.c,v 1.6 2021/08/06 19:38:53 jmcneill Exp $ */
/*-
* Copyright (c) 2017 Jared McNeill <[email protected]>
@@ -27,7 +27,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: psci.c,v 1.5 2021/01/16 23:51:50 chs Exp $");
+__KERNEL_RCSID(0, "$NetBSD: psci.c,v 1.6 2021/08/06 19:38:53 jmcneill Exp $");
#include <sys/param.h>
#include <sys/bus.h>
@@ -45,6 +45,7 @@ __KERNEL_RCSID(0, "$NetBSD: psci.c,v 1.5
#else
#define PSCI_CPU_ON 0x84000003
#endif
+#define PSCI_FEATURES 0x8400000a
static psci_fn psci_call_fn;
@@ -53,9 +54,10 @@ static uint32_t psci_functions[PSCI_FUNC
[PSCI_FUNC_SYSTEM_OFF] = PSCI_SYSTEM_OFF,
[PSCI_FUNC_SYSTEM_RESET] = PSCI_SYSTEM_RESET,
[PSCI_FUNC_CPU_ON] = PSCI_CPU_ON,
+ [PSCI_FUNC_FEATURES] = PSCI_FEATURES,
};
-static int
+int
psci_call(register_t fid, register_t arg1, register_t arg2, register_t arg3)
{
KASSERT(psci_call_fn != NULL);
@@ -98,6 +100,15 @@ psci_system_reset(void)
psci_call(psci_functions[PSCI_FUNC_SYSTEM_RESET], 0, 0, 0);
}
+int
+psci_features(uint32_t fid)
+{
+ if (psci_functions[PSCI_FUNC_FEATURES] == 0) {
+ return PSCI_NOT_SUPPORTED;
+ }
+ return psci_call(psci_functions[PSCI_FUNC_FEATURES], fid, 0, 0);
+}
+
void
psci_init(psci_fn fn)
{
Index: src/sys/arch/arm/arm/psci.h
diff -u src/sys/arch/arm/arm/psci.h:1.2 src/sys/arch/arm/arm/psci.h:1.3
--- src/sys/arch/arm/arm/psci.h:1.2 Sat Oct 13 00:07:55 2018
+++ src/sys/arch/arm/arm/psci.h Fri Aug 6 19:38:53 2021
@@ -1,4 +1,4 @@
-/* $NetBSD: psci.h,v 1.2 2018/10/13 00:07:55 jmcneill Exp $ */
+/* $NetBSD: psci.h,v 1.3 2021/08/06 19:38:53 jmcneill Exp $ */
/*-
* Copyright (c) 2017 Jared McNeill <[email protected]>
@@ -37,6 +37,7 @@ enum psci_function {
PSCI_FUNC_CPU_ON,
PSCI_FUNC_SYSTEM_OFF,
PSCI_FUNC_SYSTEM_RESET,
+ PSCI_FUNC_FEATURES,
PSCI_FUNC_MAX
};
@@ -108,4 +109,13 @@ void psci_system_off(void);
*/
void psci_system_reset(void);
+/*
+ * Discover supported features.
+ */
+int psci_features(uint32_t);
+
+/*
+ * Generic PSCI call.
+ */
+int psci_call(register_t, register_t, register_t, register_t);
#endif /* _ARM_PSCI_H */
Index: src/sys/arch/arm/conf/files.arm
diff -u src/sys/arch/arm/conf/files.arm:1.164 src/sys/arch/arm/conf/files.arm:1.165
--- src/sys/arch/arm/conf/files.arm:1.164 Wed Oct 21 13:31:51 2020
+++ src/sys/arch/arm/conf/files.arm Fri Aug 6 19:38:53 2021
@@ -1,4 +1,4 @@
-# $NetBSD: files.arm,v 1.164 2020/10/21 13:31:51 christos Exp $
+# $NetBSD: files.arm,v 1.165 2021/08/06 19:38:53 jmcneill Exp $
# temporary define to allow easy moving to ../arch/arm/arm32
defflag ARM32
@@ -99,8 +99,12 @@ obsolete defflag ARMFPE
file arch/arm/vfp/vfp_init.c arm32
#file arch/arm/vfp/pmap_vfp.S arm32 & fpu_vfp
+# SMC Calling Convention
+define smccc
+file arch/arm/arm/smccc.c smccc
+
# Power State Coordination Interface (PSCI)
-device psci
+device psci: smccc
file arch/arm/arm/psci.c psci
file arch/arm/arm/psci_arm.S psci
Index: src/sys/arch/arm/fdt/psci_fdt.c
diff -u src/sys/arch/arm/fdt/psci_fdt.c:1.20 src/sys/arch/arm/fdt/psci_fdt.c:1.21
--- src/sys/arch/arm/fdt/psci_fdt.c:1.20 Wed Jan 27 03:10:19 2021
+++ src/sys/arch/arm/fdt/psci_fdt.c Fri Aug 6 19:38:53 2021
@@ -1,4 +1,4 @@
-/* $NetBSD: psci_fdt.c,v 1.20 2021/01/27 03:10:19 thorpej Exp $ */
+/* $NetBSD: psci_fdt.c,v 1.21 2021/08/06 19:38:53 jmcneill Exp $ */
/*-
* Copyright (c) 2017 Jared McNeill <[email protected]>
@@ -29,7 +29,7 @@
#include "opt_multiprocessor.h"
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: psci_fdt.c,v 1.20 2021/01/27 03:10:19 thorpej Exp $");
+__KERNEL_RCSID(0, "$NetBSD: psci_fdt.c,v 1.21 2021/08/06 19:38:53 jmcneill Exp $");
#include <sys/param.h>
#include <sys/atomic.h>
@@ -40,6 +40,7 @@ __KERNEL_RCSID(0, "$NetBSD: psci_fdt.c,v
#include <dev/fdt/fdtvar.h>
+#include <arm/arm/smccc.h>
#include <arm/arm/psci.h>
#include <arm/fdt/psci_fdtvar.h>
@@ -135,6 +136,8 @@ psci_fdt_init(const int phandle)
psci_setfunc(PSCI_FUNC_CPU_ON, val);
}
+ smccc_probe();
+
return 0;
}
Added files:
Index: src/sys/arch/arm/arm/smccc.c
diff -u /dev/null src/sys/arch/arm/arm/smccc.c:1.1
--- /dev/null Fri Aug 6 19:38:54 2021
+++ src/sys/arch/arm/arm/smccc.c Fri Aug 6 19:38:53 2021
@@ -0,0 +1,89 @@
+/* $NetBSD: smccc.c,v 1.1 2021/08/06 19:38:53 jmcneill Exp $ */
+
+/*-
+ * Copyright (c) 2021 Jared McNeill <[email protected]>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__KERNEL_RCSID(0, "$NetBSD: smccc.c,v 1.1 2021/08/06 19:38:53 jmcneill Exp $");
+
+#include <sys/param.h>
+#include <sys/kernel.h>
+
+#include <arm/arm/psci.h>
+#include <arm/arm/smccc.h>
+
+/* Minimum supported PSCI version for SMCCC discovery */
+#define PSCI_VERSION_1_0 0x10000
+
+/* Retrieve the implemented version of the SMC Calling Convention. */
+#define SMCCC_VERSION 0x80000000
+
+/* True if SMCCC is detected. */
+static bool smccc_present;
+
+/*
+ * smccc_probe --
+ *
+ * Returns true if SMCCC is supported by platform firmware.
+ */
+bool
+smccc_probe(void)
+{
+ if (cold && !smccc_present) {
+ if (!psci_available() || psci_version() < PSCI_VERSION_1_0) {
+ return false;
+ }
+
+ smccc_present = psci_features(SMCCC_VERSION) == PSCI_SUCCESS;
+ }
+ return smccc_present;
+}
+
+/*
+ * smccc_version --
+ *
+ * Return the implemented SMCCC version, or a negative error code on failure.
+ */
+int
+smccc_version(void)
+{
+ return smccc_call(SMCCC_VERSION, 0, 0, 0);
+}
+
+/*
+ * smccc_call --
+ *
+ * Generic call interface for SMC/HVC calls.
+ */
+int
+smccc_call(register_t fid, register_t arg1, register_t arg2, register_t arg3)
+{
+ if (!smccc_present) {
+ return SMCCC_NOT_SUPPORTED;
+ }
+
+ return psci_call(fid, arg1, arg2, arg3);
+}
Index: src/sys/arch/arm/arm/smccc.h
diff -u /dev/null src/sys/arch/arm/arm/smccc.h:1.1
--- /dev/null Fri Aug 6 19:38:54 2021
+++ src/sys/arch/arm/arm/smccc.h Fri Aug 6 19:38:53 2021
@@ -0,0 +1,55 @@
+/* $NetBSD: smccc.h,v 1.1 2021/08/06 19:38:53 jmcneill Exp $ */
+
+/*-
+ * Copyright (c) 2021 Jared McNeill <[email protected]>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef _ARM_SMCCC_H
+#define _ARM_SMCCC_H
+
+/*
+ * SMCCC return codes
+ */
+#define SMCCC_SUCCESS 0
+#define SMCCC_NOT_SUPPORTED -1
+#define SMCCC_NOT_REQUIRED -2
+#define SMCCC_INVALID_PARAMETER -3
+
+/*
+ * Returns true if SMCCC is supported.
+ */
+bool smccc_probe(void);
+
+/*
+ * Get SMCCC version.
+ */
+int smccc_version(void);
+
+/*
+ * Call an SMC/HVC service.
+ */
+int smccc_call(register_t, register_t, register_t, register_t);
+
+#endif /* _ARM_SMCCC_H */
