Module Name: src
Committed By: jmcneill
Date: Wed Jun 28 23:48:23 UTC 2017
Modified Files:
src/sys/arch/arm/conf: files.arm
src/sys/arch/arm/fdt: files.fdt
Added Files:
src/sys/arch/arm/arm: psci.c psci.h psci_arm.S
src/sys/arch/arm/fdt: psci_fdt.c psci_fdt.h
Log Message:
Add support for ARM Power State Coordination Interface (PSCI).
To generate a diff of this commit:
cvs rdiff -u -r0 -r1.1 src/sys/arch/arm/arm/psci.c \
src/sys/arch/arm/arm/psci.h src/sys/arch/arm/arm/psci_arm.S
cvs rdiff -u -r1.132 -r1.133 src/sys/arch/arm/conf/files.arm
cvs rdiff -u -r1.11 -r1.12 src/sys/arch/arm/fdt/files.fdt
cvs rdiff -u -r0 -r1.1 src/sys/arch/arm/fdt/psci_fdt.c \
src/sys/arch/arm/fdt/psci_fdt.h
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/arm/conf/files.arm
diff -u src/sys/arch/arm/conf/files.arm:1.132 src/sys/arch/arm/conf/files.arm:1.133
--- src/sys/arch/arm/conf/files.arm:1.132 Fri May 26 21:17:46 2017
+++ src/sys/arch/arm/conf/files.arm Wed Jun 28 23:48:23 2017
@@ -1,4 +1,4 @@
-# $NetBSD: files.arm,v 1.132 2017/05/26 21:17:46 jmcneill Exp $
+# $NetBSD: files.arm,v 1.133 2017/06/28 23:48:23 jmcneill Exp $
# temporary define to allow easy moving to ../arch/arm/arm32
defflag ARM32
@@ -91,6 +91,11 @@ obsolete defflag ARMFPE
file arch/arm/vfp/vfp_init.c arm32
#file arch/arm/vfp/pmap_vfp.S arm32 & fpu_vfp
+# Power State Coordination Interface (PSCI)
+device psci
+file arch/arm/arm/psci.c psci
+file arch/arm/arm/psci_arm.S psci
+
# PMAP_DEBUG (heavily abused option)
defflag PMAP_DEBUG
Index: src/sys/arch/arm/fdt/files.fdt
diff -u src/sys/arch/arm/fdt/files.fdt:1.11 src/sys/arch/arm/fdt/files.fdt:1.12
--- src/sys/arch/arm/fdt/files.fdt:1.11 Thu Jun 8 21:01:06 2017
+++ src/sys/arch/arm/fdt/files.fdt Wed Jun 28 23:48:22 2017
@@ -1,4 +1,4 @@
-# $NetBSD: files.fdt,v 1.11 2017/06/08 21:01:06 jmcneill Exp $
+# $NetBSD: files.fdt,v 1.12 2017/06/28 23:48:22 jmcneill Exp $
include "dev/pckbport/files.pckbport"
@@ -38,5 +38,8 @@ file arch/arm/fdt/aaci_fdt.c aaci_fdt
attach plrtc at fdt with plrtc_fdt
file arch/arm/fdt/plrtc_fdt.c plrtc_fdt
+attach psci at fdt with psci_fdt
+file arch/arm/fdt/psci_fdt.c psci_fdt
+
# Console parameters
defparam opt_fdt_arm.h CONSADDR
Added files:
Index: src/sys/arch/arm/arm/psci.c
diff -u /dev/null src/sys/arch/arm/arm/psci.c:1.1
--- /dev/null Wed Jun 28 23:48:23 2017
+++ src/sys/arch/arm/arm/psci.c Wed Jun 28 23:48:23 2017
@@ -0,0 +1,120 @@
+/* $NetBSD: psci.c,v 1.1 2017/06/28 23:48:23 jmcneill Exp $ */
+
+/*-
+ * Copyright (c) 2017 Jared McNeill <jmcne...@invisible.ca>
+ * 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 "opt_diagnostic.h"
+
+#include <sys/cdefs.h>
+__KERNEL_RCSID(0, "$NetBSD: psci.c,v 1.1 2017/06/28 23:48:23 jmcneill Exp $");
+
+#include <sys/param.h>
+#include <sys/bus.h>
+#include <sys/cpu.h>
+#include <sys/device.h>
+
+#include <arm/arm/psci.h>
+
+/* PSCI methods */
+#define PSCI_VERSION 0x84000000
+#define PSCI_SYSTEM_OFF 0x84000008
+#define PSCI_SYSTEM_RESET 0x84000009
+#if defined(__aarch64__)
+#define PSCI_CPU_ON 0xc4000002
+#else
+#define PSCI_CPU_ON 0x84000002
+#endif
+
+static psci_fn psci_call_fn;
+
+static uint32_t psci_functions[PSCI_FUNC_MAX] = {
+ [PSCI_FUNC_VERSION] = PSCI_VERSION,
+ [PSCI_FUNC_SYSTEM_OFF] = PSCI_SYSTEM_OFF,
+ [PSCI_FUNC_SYSTEM_RESET] = PSCI_SYSTEM_RESET,
+ [PSCI_FUNC_CPU_ON] = PSCI_CPU_ON,
+};
+
+static int
+psci_call(register_t fid, register_t arg1, register_t arg2, register_t arg3)
+{
+ KASSERT(psci_call_fn != NULL);
+
+ if (fid == 0)
+ return PSCI_NOT_SUPPORTED;
+
+ return psci_call_fn(fid, arg1, arg2, arg3);
+}
+
+uint32_t
+psci_version(void)
+{
+ if (psci_functions[PSCI_FUNC_VERSION] == 0) {
+ /* Pre-0.2 implementation */
+ return __SHIFTIN(0, PSCI_VERSION_MAJOR) |
+ __SHIFTIN(1, PSCI_VERSION_MINOR);
+ }
+
+ return psci_call(psci_functions[PSCI_FUNC_VERSION], 0, 0, 0);
+}
+
+int
+psci_cpu_on(register_t target_cpu, register_t entry_point_address,
+ register_t context_id)
+{
+ return psci_call(psci_functions[PSCI_FUNC_CPU_ON], target_cpu,
+ entry_point_address, context_id);
+}
+
+void
+psci_system_off(void)
+{
+ psci_call(psci_functions[PSCI_FUNC_SYSTEM_OFF], 0, 0, 0);
+}
+
+void
+psci_system_reset(void)
+{
+ psci_call(psci_functions[PSCI_FUNC_SYSTEM_RESET], 0, 0, 0);
+}
+
+void
+psci_init(psci_fn fn)
+{
+ psci_call_fn = fn;
+}
+
+void
+psci_clearfunc(void)
+{
+ for (int i = 0; i < PSCI_FUNC_MAX; i++)
+ psci_setfunc(i, 0);
+}
+
+void
+psci_setfunc(enum psci_function func, uint32_t fid)
+{
+ psci_functions[func] = fid;
+}
Index: src/sys/arch/arm/arm/psci.h
diff -u /dev/null src/sys/arch/arm/arm/psci.h:1.1
--- /dev/null Wed Jun 28 23:48:23 2017
+++ src/sys/arch/arm/arm/psci.h Wed Jun 28 23:48:23 2017
@@ -0,0 +1,106 @@
+/* $NetBSD: psci.h,v 1.1 2017/06/28 23:48:23 jmcneill Exp $ */
+
+/*-
+ * Copyright (c) 2017 Jared McNeill <jmcne...@invisible.ca>
+ * 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_PSCI_H
+#define _ARM_PSCI_H
+
+/*
+ * List of supported PSCI functions.
+ */
+enum psci_function {
+ PSCI_FUNC_VERSION,
+ PSCI_FUNC_CPU_ON,
+ PSCI_FUNC_SYSTEM_OFF,
+ PSCI_FUNC_SYSTEM_RESET,
+ PSCI_FUNC_MAX
+};
+
+/*
+ * PSCI error codes
+ */
+#define PSCI_SUCCESS 0
+#define PSCI_NOT_SUPPORTED -1
+#define PSCI_INVALID_PARAMETERS -2
+#define PSCI_DENIED -3
+#define PSCI_ALREADY_ON -4
+#define PSCI_ON_PENDING -5
+#define PSCI_INTERNAL_FAILURE -6
+#define PSCI_NOT_PRESENT -7
+#define PSCI_DISABLED -8
+#define PSCI_INVALID_ADDRESS -9
+
+/*
+ * PSCI call method interface.
+ */
+typedef int (*psci_fn)(register_t, register_t, register_t, register_t);
+
+/*
+ * Set the PSCI call method. Pass either psci_call_smc or psci_call_hvc.
+ */
+void psci_init(psci_fn);
+
+/*
+ * PSCI call methods, implemented in psci.S
+ */
+int psci_call_smc(register_t, register_t, register_t, register_t);
+int psci_call_hvc(register_t, register_t, register_t, register_t);
+
+/*
+ * Clear PSCI function table. The default table includes function IDs for
+ * PSCI 0.2+. A PSCI 0.1 implementation will use its own function ID mappings.
+ */
+void psci_clearfunc(void);
+
+/*
+ * Set PSCI function ID for a given PSCI function.
+ */
+void psci_setfunc(enum psci_function, uint32_t);
+
+/*
+ * Return the version of PSCI implemented.
+ */
+uint32_t psci_version(void);
+#define PSCI_VERSION_MAJOR __BITS(31,16)
+#define PSCI_VERSION_MINOR __BITS(15,0)
+
+/*
+ * Power up a core. Args: target_cpu, entry_point_address, context_id
+ */
+int psci_cpu_on(register_t, register_t, register_t);
+
+/*
+ * Shut down the system.
+ */
+void psci_system_off(void);
+
+/*
+ * Reset the system.
+ */
+void psci_system_reset(void);
+
+#endif /* _ARM_PSCI_H */
Index: src/sys/arch/arm/arm/psci_arm.S
diff -u /dev/null src/sys/arch/arm/arm/psci_arm.S:1.1
--- /dev/null Wed Jun 28 23:48:23 2017
+++ src/sys/arch/arm/arm/psci_arm.S Wed Jun 28 23:48:23 2017
@@ -0,0 +1,47 @@
+/* $NetBSD: psci_arm.S,v 1.1 2017/06/28 23:48:23 jmcneill Exp $ */
+
+/*-
+ * Copyright (c) 2017 Jared McNeill <jmcne...@invisible.ca>
+ * 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 <machine/asm.h>
+
+RCSID("$NetBSD: psci_arm.S,v 1.1 2017/06/28 23:48:23 jmcneill Exp $");
+
+ .arch armv7a
+ .arch_extension sec
+ .arch_extension virt
+
+/* Invoke PSCI function using Secure Monitor Call interface */
+ENTRY(psci_call_smc)
+ smc #0
+ RET
+END(psci_call_smc)
+
+/* Invoke PSCI function using Hypervisor Call interface */
+ENTRY(psci_call_hvc)
+ hvc #0
+ RET
+END(psci_call_hvc)
Index: src/sys/arch/arm/fdt/psci_fdt.c
diff -u /dev/null src/sys/arch/arm/fdt/psci_fdt.c:1.1
--- /dev/null Wed Jun 28 23:48:23 2017
+++ src/sys/arch/arm/fdt/psci_fdt.c Wed Jun 28 23:48:22 2017
@@ -0,0 +1,176 @@
+/* $NetBSD: psci_fdt.c,v 1.1 2017/06/28 23:48:22 jmcneill Exp $ */
+
+/*-
+ * Copyright (c) 2017 Jared McNeill <jmcne...@invisible.ca>
+ * 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: psci_fdt.c,v 1.1 2017/06/28 23:48:22 jmcneill Exp $");
+
+#include <sys/param.h>
+#include <sys/bus.h>
+#include <sys/device.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+
+#include <dev/fdt/fdtvar.h>
+
+#include <arm/locore.h>
+#include <arm/armreg.h>
+
+#include <arm/arm/psci.h>
+#include <arm/fdt/psci_fdt.h>
+
+static int psci_fdt_match(device_t, cfdata_t, void *);
+static void psci_fdt_attach(device_t, device_t, void *);
+
+static int psci_fdt_init(const int);
+
+static const char * const compatible[] = {
+ "arm,psci",
+ "arm,psci-0.2",
+ "arm,psci-1.0",
+ NULL
+};
+
+CFATTACH_DECL_NEW(psci_fdt, 0, psci_fdt_match, psci_fdt_attach, NULL, NULL);
+
+static int
+psci_fdt_match(device_t parent, cfdata_t cf, void *aux)
+{
+ struct fdt_attach_args * const faa = aux;
+
+ return of_match_compatible(faa->faa_phandle, compatible);
+}
+
+static void
+psci_fdt_attach(device_t parent, device_t self, void *aux)
+{
+ struct fdt_attach_args * const faa = aux;
+ const int phandle = faa->faa_phandle;
+
+ psci_fdt_init(phandle);
+
+ const uint32_t ver = psci_version();
+ const u_int ver_maj = __SHIFTOUT(ver, PSCI_VERSION_MAJOR);
+ const u_int ver_min = __SHIFTOUT(ver, PSCI_VERSION_MINOR);
+
+ aprint_naive("\n");
+ aprint_normal(": PSCI %u.%u\n", ver_maj, ver_min);
+}
+
+static int
+psci_fdt_init(const int phandle)
+{
+ char method[4];
+ uint32_t val;
+
+ if (!of_hasprop(phandle, "method")) {
+ aprint_error("PSCI: missing 'method' property\n");
+ return EINVAL;
+ }
+
+ OF_getprop(phandle, "method", method, sizeof(method));
+ if (strcmp(method, "smc") == 0)
+ psci_init(psci_call_smc);
+ else if (strcmp(method, "hvc") == 0)
+ psci_init(psci_call_hvc);
+ else {
+ aprint_error("PSCI: unsupported method '%s'\n", method);
+ return EINVAL;
+ }
+
+ const char * const compat_0_1[] = { "arm,psci", NULL };
+ if (of_match_compatible(phandle, compat_0_1)) {
+ psci_clearfunc();
+ if (of_getprop_uint32(phandle, "cpu_on", &val) == 0)
+ psci_setfunc(PSCI_FUNC_CPU_ON, val);
+ }
+
+ return 0;
+}
+
+void
+psci_fdt_bootstrap(void)
+{
+ extern void cortex_mpstart(void);
+ bus_addr_t mpidr;
+ uint32_t bp_mpidr;
+ int child;
+
+ const int cpus = OF_finddevice("/cpus");
+ if (cpus == -1) {
+ aprint_error("PSCI: no /cpus node found\n");
+ arm_cpu_max = 1;
+ return;
+ }
+
+ /* Count CPUs */
+ arm_cpu_max = 0;
+ for (child = OF_child(cpus); child; child = OF_peer(child))
+ if (fdtbus_status_okay(child))
+ arm_cpu_max++;
+
+ const int phandle = OF_finddevice("/psci");
+ if (phandle == -1) {
+ aprint_error("PSCI: no /psci node found\n");
+ return;
+ }
+
+ if (psci_fdt_init(phandle) != 0)
+ return;
+
+ /* MPIDR affinity levels of boot processor. */
+ bp_mpidr = armreg_mpidr_read() & (MPIDR_AFF2|MPIDR_AFF1|MPIDR_AFF0);
+
+ /* Boot APs */
+ uint32_t started = 0;
+ for (child = OF_child(cpus); child; child = OF_peer(child)) {
+ if (!fdtbus_status_okay(child))
+ continue;
+ if (fdtbus_get_reg(child, 0, &mpidr, NULL) != 0)
+ continue;
+ if (mpidr == bp_mpidr)
+ continue; /* BP already started */
+
+ /* XXX NetBSD requires all CPUs to be in the same cluster */
+ const u_int bp_clid = __SHIFTOUT(bp_mpidr, CORTEXA9_MPIDR_CLID);
+ const u_int clid = __SHIFTOUT(mpidr, CORTEXA9_MPIDR_CLID);
+ if (bp_clid != clid)
+ continue;
+
+ const u_int cpuid = __SHIFTOUT(mpidr, CORTEXA9_MPIDR_CPUID);
+ int ret = psci_cpu_on(cpuid, (register_t)cortex_mpstart, 0);
+ if (ret == PSCI_SUCCESS)
+ started |= __BIT(cpuid);
+ }
+
+ /* Wait for APs to start */
+ for (u_int i = 0x10000000; i > 0; i--) {
+ arm_dmb();
+ if (arm_cpu_hatched == started)
+ break;
+ }
+}
Index: src/sys/arch/arm/fdt/psci_fdt.h
diff -u /dev/null src/sys/arch/arm/fdt/psci_fdt.h:1.1
--- /dev/null Wed Jun 28 23:48:23 2017
+++ src/sys/arch/arm/fdt/psci_fdt.h Wed Jun 28 23:48:22 2017
@@ -0,0 +1,35 @@
+/* $NetBSD: psci_fdt.h,v 1.1 2017/06/28 23:48:22 jmcneill Exp $ */
+
+/*-
+ * Copyright (c) 2017 Jared McNeill <jmcne...@invisible.ca>
+ * 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_PSCI_FDT_H
+#define _ARM_PSCI_FDT_H
+
+/* Initialize PSCI and boot APs */
+void psci_fdt_bootstrap(void);
+
+#endif /* !_ARM_PSCI_FDT_H */
