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ARM: PSCI: Add helper functions to access per-CPU target PC storage 

Now that we have a data section, add helper functions to save and fetch
per-CPU target PC.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Chen-Yu Tsai 2016-07-05 21:45:07 +08:00 committed by Hans de Goede
parent a5aa7ff33a
commit 45c334e6b2
3 changed files with 44 additions and 1 deletions
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2
arch/arm/cpu/armv7/Makefile
View File

@ -19,7 +19,7 @@ endif
endif
obj-$(CONFIG_ARMV7_NONSEC) += nonsec_virt.o virt-v7.o virt-dt.o
obj-$(CONFIG_ARMV7_PSCI) += psci.o
obj-$(CONFIG_ARMV7_PSCI) += psci.o psci-common.o
obj-$(CONFIG_IPROC) += iproc-common/
obj-$(CONFIG_KONA) += kona-common/

39
arch/arm/cpu/armv7/psci-common.c Normal file
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@ -0,0 +1,39 @@
/*
* Common PSCI functions
*
* Copyright (C) 2016 Chen-Yu Tsai
* Author: Chen-Yu Tsai <wens@csie.org>
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <asm/armv7.h>
#include <asm/macro.h>
#include <asm/psci.h>
#include <asm/secure.h>
#include <linux/linkage.h>
static u32 psci_target_pc[CONFIG_ARMV7_PSCI_NR_CPUS] __secure_data = { 0 };
void __secure psci_save_target_pc(int cpu, u32 pc)
{
psci_target_pc[cpu] = pc;
DSB;
}
u32 __secure psci_get_target_pc(int cpu)
{
return psci_target_pc[cpu];
}

4
arch/arm/include/asm/psci.h
View File

@ -54,6 +54,10 @@
#ifndef __ASSEMBLY__
#include <asm/types.h>
/* These 2 helper functions assume cpu < CONFIG_ARMV7_PSCI_NR_CPUS */
u32 psci_get_target_pc(int cpu);
void psci_save_target_pc(int cpu, u32 pc);
void psci_cpu_entry(void);
u32 psci_get_cpu_id(void);
u32 psci_get_cpu_stack_top(int cpu);