[PATCH v2 3/4] arm64: add implementation for arm-smccc
Will Deacon
will.deacon at arm.com
Mon Nov 23 05:28:56 PST 2015
On Wed, Nov 11, 2015 at 11:04:25AM +0100, Jens Wiklander wrote:
> Adds implementation for arm-smccc and enables CONFIG_HAVE_SMCCC.
>
> Signed-off-by: Jens Wiklander <jens.wiklander at linaro.org>
> ---
> arch/arm64/Kconfig | 1 +
> arch/arm64/kernel/Makefile | 1 +
> arch/arm64/kernel/asm-offsets.c | 3 +++
> arch/arm64/kernel/smccc-call.S | 43 +++++++++++++++++++++++++++++++++++++++++
> arch/arm64/kernel/smccc.c | 18 +++++++++++++++++
> 5 files changed, 66 insertions(+)
> create mode 100644 arch/arm64/kernel/smccc-call.S
> create mode 100644 arch/arm64/kernel/smccc.c
>
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index 07d1811..a7332ca 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -89,6 +89,7 @@ config ARM64
> select SPARSE_IRQ
> select SYSCTL_EXCEPTION_TRACE
> select HAVE_CONTEXT_TRACKING
> + select HAVE_ARM_SMCCC
> help
> ARM 64-bit (AArch64) Linux support.
>
> diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile
> index 22dc9bc..c61d758 100644
> --- a/arch/arm64/kernel/Makefile
> +++ b/arch/arm64/kernel/Makefile
> @@ -36,6 +36,7 @@ arm64-obj-$(CONFIG_EFI) += efi.o efi-stub.o efi-entry.o
> arm64-obj-$(CONFIG_PCI) += pci.o
> arm64-obj-$(CONFIG_ARMV8_DEPRECATED) += armv8_deprecated.o
> arm64-obj-$(CONFIG_ACPI) += acpi.o
> +arm64-obj-$(CONFIG_HAVE_ARM_SMCCC) += smccc-call.o smccc.o
I think you can just stick these in arm64-obj-y, since that option will
never be turned off.
> obj-y += $(arm64-obj-y) vdso/
> obj-m += $(arm64-obj-m)
> diff --git a/arch/arm64/kernel/asm-offsets.c b/arch/arm64/kernel/asm-offsets.c
> index 8d89cf8..cfa0885 100644
> --- a/arch/arm64/kernel/asm-offsets.c
> +++ b/arch/arm64/kernel/asm-offsets.c
> @@ -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;
> }
> diff --git a/arch/arm64/kernel/smccc-call.S b/arch/arm64/kernel/smccc-call.S
> new file mode 100644
> index 0000000..ae0496f
> --- /dev/null
> +++ b/arch/arm64/kernel/smccc-call.S
> @@ -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)
> diff --git a/arch/arm64/kernel/smccc.c b/arch/arm64/kernel/smccc.c
> new file mode 100644
> index 0000000..7941210
> --- /dev/null
> +++ b/arch/arm64/kernel/smccc.c
> @@ -0,0 +1,18 @@
> +/*
> + * Copyright (c) 2015, Linaro Limited
> + *
> + * This software is licensed under the terms of the GNU General Public
> + * License version 2, as published by the Free Software Foundation, and
> + * may be copied, distributed, and modified under those terms.
> + *
> + * 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/export.h>
> +#include <linux/arm-smccc.h>
> +
> +EXPORT_SYMBOL_GPL(arm_smccc_smc);
> +EXPORT_SYMBOL_GPL(arm_smccc_hvc);
You can just put these in arch/arm64/kernel/arm64ksyms.c, which is where
the rest of the EXPORTs for asm symbols live.
With those changes:
Acked-by: Will Deacon <will.deacon at arm.com>
Will
More information about the linux-arm-kernel
mailing list