Using PSCI you can not only reset the system, you can also shut it down! This patch exposes a function to do exactly that to whatever code wants to make use of it.
Signed-off-by: Alexander Graf agraf@suse.de --- arch/arm/cpu/armv8/fwcall.c | 15 +++++++++++++++ arch/arm/include/asm/system.h | 1 + 2 files changed, 16 insertions(+)
diff --git a/arch/arm/cpu/armv8/fwcall.c b/arch/arm/cpu/armv8/fwcall.c index 6bb68f2..b3ef7c0 100644 --- a/arch/arm/cpu/armv8/fwcall.c +++ b/arch/arm/cpu/armv8/fwcall.c @@ -97,3 +97,18 @@ void __noreturn psci_system_reset(void) while (1) ; } + +void __noreturn psci_system_off(void) +{ + struct pt_regs regs; + + regs.regs[0] = ARM_PSCI_0_2_FN_SYSTEM_OFF; + + if (use_smc_for_psci) + smc_call(®s); + else + hvc_call(®s); + + while (1) + ; +} diff --git a/arch/arm/include/asm/system.h b/arch/arm/include/asm/system.h index 96f3912..211b1e7 100644 --- a/arch/arm/include/asm/system.h +++ b/arch/arm/include/asm/system.h @@ -116,6 +116,7 @@ void flush_l3_cache(void); void smc_call(struct pt_regs *args);
void __noreturn psci_system_reset(void); +void __noreturn psci_system_off(void);
#endif /* __ASSEMBLY__ */