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ARM: 8480/2: arm64: add implementation for arm-smccc

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Adds implementation for arm-smccc and enables CONFIG_HAVE_SMCCC.

Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Jens Wiklander 2016-01-04 15:44:32 +01:00 committed by Russell King
parent b329f95d70
commit 14457459f9
5 changed files with 53 additions and 1 deletions
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1
arch/arm64/Kconfig
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@ -92,6 +92,7 @@ config ARM64
select SPARSE_IRQ
select SYSCTL_EXCEPTION_TRACE
select HAVE_CONTEXT_TRACKING
select HAVE_ARM_SMCCC
help
ARM 64-bit (AArch64) Linux support.

2
arch/arm64/kernel/Makefile
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@ -17,7 +17,7 @@ arm64-obj-y := debug-monitors.o entry.o irq.o fpsimd.o \
hyp-stub.o psci.o psci-call.o cpu_ops.o insn.o \
return_address.o cpuinfo.o cpu_errata.o \
cpufeature.o alternative.o cacheinfo.o \
smp.o smp_spin_table.o topology.o
smp.o smp_spin_table.o topology.o smccc-call.o
extra-$(CONFIG_EFI) := efi-entry.o

5
arch/arm64/kernel/arm64ksyms.c
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@ -26,6 +26,7 @@
#include <linux/syscalls.h>
#include <linux/uaccess.h>
#include <linux/io.h>
#include <linux/arm-smccc.h>
#include <asm/checksum.h>
@ -68,3 +69,7 @@ EXPORT_SYMBOL(test_and_change_bit);
#ifdef CONFIG_FUNCTION_TRACER
EXPORT_SYMBOL(_mcount);
#endif
/* arm-smccc */
EXPORT_SYMBOL(arm_smccc_smc);
EXPORT_SYMBOL(arm_smccc_hvc);

3
arch/arm64/kernel/asm-offsets.c
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@ -28,6 +28,7 @@
#include <asm/suspend.h>
#include <asm/vdso_datapage.h>
#include <linux/kbuild.h>
#include <linux/arm-smccc.h>
int main(void)
{
@ -161,5 +162,7 @@ int main(void)
DEFINE(SLEEP_SAVE_SP_PHYS, offsetof(struct sleep_save_sp, save_ptr_stash_phys));
DEFINE(SLEEP_SAVE_SP_VIRT, offsetof(struct sleep_save_sp, save_ptr_stash));
#endif
DEFINE(ARM_SMCCC_RES_X0_OFFS, offsetof(struct arm_smccc_res, a0));
DEFINE(ARM_SMCCC_RES_X2_OFFS, offsetof(struct arm_smccc_res, a2));
return 0;
}

43
arch/arm64/kernel/smccc-call.S Normal file
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@ -0,0 +1,43 @@
/*
* Copyright (c) 2015, Linaro Limited
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License Version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <linux/linkage.h>
#include <asm/asm-offsets.h>
.macro SMCCC instr
.cfi_startproc
\instr #0
ldr x4, [sp]
stp x0, x1, [x4, #ARM_SMCCC_RES_X0_OFFS]
stp x2, x3, [x4, #ARM_SMCCC_RES_X2_OFFS]
ret
.cfi_endproc
.endm
/*
* void arm_smccc_smc(unsigned long a0, unsigned long a1, unsigned long a2,
* unsigned long a3, unsigned long a4, unsigned long a5,
* unsigned long a6, unsigned long a7, struct arm_smccc_res *res)
*/
ENTRY(arm_smccc_smc)
SMCCC smc
ENDPROC(arm_smccc_smc)
/*
* void arm_smccc_hvc(unsigned long a0, unsigned long a1, unsigned long a2,
* unsigned long a3, unsigned long a4, unsigned long a5,
* unsigned long a6, unsigned long a7, struct arm_smccc_res *res)
*/
ENTRY(arm_smccc_hvc)
SMCCC hvc
ENDPROC(arm_smccc_hvc)