From 45c334e6b22bae75ada8662b88000c4347b1361b Mon Sep 17 00:00:00 2001 From: Chen-Yu Tsai Date: Tue, 5 Jul 2016 21:45:07 +0800 Subject: [PATCH] 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 Signed-off-by: Hans de Goede --- arch/arm/cpu/armv7/Makefile | 2 +- arch/arm/cpu/armv7/psci-common.c | 39 ++++++++++++++++++++++++++++++++ arch/arm/include/asm/psci.h | 4 ++++ 3 files changed, 44 insertions(+), 1 deletion(-) create mode 100644 arch/arm/cpu/armv7/psci-common.c diff --git a/arch/arm/cpu/armv7/Makefile b/arch/arm/cpu/armv7/Makefile index ddd8d12d51..0d4bfbc55b 100644 --- a/arch/arm/cpu/armv7/Makefile +++ b/arch/arm/cpu/armv7/Makefile @@ -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/ diff --git a/arch/arm/cpu/armv7/psci-common.c b/arch/arm/cpu/armv7/psci-common.c new file mode 100644 index 0000000000..d14b693747 --- /dev/null +++ b/arch/arm/cpu/armv7/psci-common.c @@ -0,0 +1,39 @@ +/* + * Common PSCI functions + * + * Copyright (C) 2016 Chen-Yu Tsai + * Author: Chen-Yu Tsai + * + * 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 . + */ + +#include +#include +#include +#include +#include +#include + +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]; +} + diff --git a/arch/arm/include/asm/psci.h b/arch/arm/include/asm/psci.h index dab5769976..a0da023007 100644 --- a/arch/arm/include/asm/psci.h +++ b/arch/arm/include/asm/psci.h @@ -54,6 +54,10 @@ #ifndef __ASSEMBLY__ #include +/* 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); -- 2.39.5