armv8: Add Secure Monitor/Hypervisor Call (SMC/HVC) infrastructure

This commit adds functions issuing calls to secure monitor or
hypervisore. This allows using services such as Power State
Coordination Interface (PSCI) provided by firmware, e.g. ARM
Trusted Firmware (ATF)

The SMC call can destroy all registers declared temporary by the
calling conventions. The clobber list is "x0..x17" because of
this

Signed-off-by: Sergey Temerkhanov <s.temerkhanov@gmail.com>
Signed-off-by: Corey Minyard <cminyard@mvista.com>
Signed-off-by: Radha Mohan Chintakuntla <rchintakuntla@cavium.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Mateusz Kulikowski <mateusz.kulikowski@gmail.com>

diff --git a/arch/arm/cpu/armv8/Makefile b/arch/arm/cpu/armv8/Makefile
index 48c041bb9b30d556cda7d766e9e0e841a65c5017..1c85aa924db05108329c4982460cf68e8300523a 100644 (file)
--- a/arch/arm/cpu/armv8/Makefile
+++ b/arch/arm/cpu/armv8/Makefile
@@ -14,6 +14,7 @@ obj-y += exceptions.o
 obj-y  += cache.o
 obj-y  += tlb.o
 obj-y  += transition.o
+obj-y  += fwcall.o
 
 obj-$(CONFIG_FSL_LAYERSCAPE) += fsl-layerscape/
 obj-$(CONFIG_ARCH_ZYNQMP) += zynqmp/

diff --git a/arch/arm/cpu/armv8/fwcall.c b/arch/arm/cpu/armv8/fwcall.c
new file mode 100644 (file)
index 0000000..9efcc5a
--- /dev/null
+++ b/arch/arm/cpu/armv8/fwcall.c
@@ -0,0 +1,75 @@
+/**
+ * (C) Copyright 2014, Cavium Inc.
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+**/
+
+#include <asm-offsets.h>
+#include <config.h>
+#include <version.h>
+#include <asm/macro.h>
+#include <asm/system.h>
+
+/*
+ * Issue the hypervisor call
+ *
+ * x0~x7: input arguments
+ * x0~x3: output arguments
+ */
+void hvc_call(struct pt_regs *args)
+{
+       asm volatile(
+               "ldr x0, %0\n"
+               "ldr x1, %1\n"
+               "ldr x2, %2\n"
+               "ldr x3, %3\n"
+               "ldr x4, %4\n"
+               "ldr x5, %5\n"
+               "ldr x6, %6\n"
+               "ldr x7, %7\n"
+               "hvc    #0\n"
+               "str x0, %0\n"
+               "str x1, %1\n"
+               "str x2, %2\n"
+               "str x3, %3\n"
+               : "+m" (args->regs[0]), "+m" (args->regs[1]),
+                 "+m" (args->regs[2]), "+m" (args->regs[3])
+               : "m" (args->regs[4]), "m" (args->regs[5]),
+                 "m" (args->regs[6]), "m" (args->regs[7])
+               : "x0", "x1", "x2", "x3", "x4", "x5", "x6", "x7",
+                 "x8", "x9", "x10", "x11", "x12", "x13", "x14", "x15",
+                 "x16", "x17");
+}
+
+/*
+ * void smc_call(arg0, arg1...arg7)
+ *
+ * issue the secure monitor call
+ *
+ * x0~x7: input arguments
+ * x0~x3: output arguments
+ */
+
+void smc_call(struct pt_regs *args)
+{
+       asm volatile(
+               "ldr x0, %0\n"
+               "ldr x1, %1\n"
+               "ldr x2, %2\n"
+               "ldr x3, %3\n"
+               "ldr x4, %4\n"
+               "ldr x5, %5\n"
+               "ldr x6, %6\n"
+               "smc    #0\n"
+               "str x0, %0\n"
+               "str x1, %1\n"
+               "str x2, %2\n"
+               "str x3, %3\n"
+               : "+m" (args->regs[0]), "+m" (args->regs[1]),
+                 "+m" (args->regs[2]), "+m" (args->regs[3])
+               : "m" (args->regs[4]), "m" (args->regs[5]),
+                 "m" (args->regs[6])
+               : "x0", "x1", "x2", "x3", "x4", "x5", "x6", "x7",
+                 "x8", "x9", "x10", "x11", "x12", "x13", "x14", "x15",
+                 "x16", "x17");
+}

diff --git a/arch/arm/include/asm/system.h b/arch/arm/include/asm/system.h
index 71b31085b41f192251b6330cdc16dc45cfa57fc7..36fa1091409d884cbbb2a2374ca5c220e1cfdcbd 100644 (file)
--- a/arch/arm/include/asm/system.h
+++ b/arch/arm/include/asm/system.h
@@ -1,6 +1,9 @@
 #ifndef __ASM_ARM_SYSTEM_H
 #define __ASM_ARM_SYSTEM_H
 
+#include <common.h>
+#include <linux/compiler.h>
+
 #ifdef CONFIG_ARM64
 
 /*
@@ -89,6 +92,24 @@ void smp_kick_all_cpus(void);
 
 void flush_l3_cache(void);
 
+/*
+ *Issue a hypervisor call in accordance with ARM "SMC Calling convention",
+ * DEN0028A
+ *
+ * @args: input and output arguments
+ *
+ */
+void hvc_call(struct pt_regs *args);
+
+/*
+ *Issue a secure monitor call in accordance with ARM "SMC Calling convention",
+ * DEN0028A
+ *
+ * @args: input and output arguments
+ *
+ */
+void smc_call(struct pt_regs *args);
+
 #endif /* __ASSEMBLY__ */
 
 #else /* CONFIG_ARM64 */