gh0s7/mckernel
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

freeze: allow interrupts in frozen state

Browse Source 
Change-Id: I1d502f828ab9f9c0e1223d021979ac3dcf4d0c25
This commit is contained in:
TOIDA,Suguru
2019-08-28 12:20:02 +09:00
committed by Masamichi Takagi
parent ff982b8594
commit 8e4073c2ca
4 changed files with 43 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

29
arch/arm64/kernel/cpu.c
View File

@ -796,6 +796,21 @@ unsigned long cpu_disable_interrupt_save(void)
return flags;
}
/* save ICC_PMR_EL1 & enable interrupt (ICC_PMR_EL1 <= ICC_PMR_EL1_UNMASKED) */
unsigned long cpu_enable_interrupt_save(void)
{
unsigned long flags;
unsigned long masked = ICC_PMR_EL1_UNMASKED;
asm volatile(
"mrs_s %0, " __stringify(ICC_PMR_EL1) "\n"
"msr_s " __stringify(ICC_PMR_EL1) ",%1"
: "=&r" (flags)
: "r" (masked)
: "memory");
return flags;
}
#else /* defined(CONFIG_HAS_NMI) */
/* @ref.impl arch/arm64/include/asm/irqflags.h::arch_local_irq_enable */
@ -844,6 +859,20 @@ unsigned long cpu_disable_interrupt_save(void)
: "memory");
return flags;
}
/* save PSTATE.DAIF & enable interrupt (PSTATE.DAIF I bit set) */
unsigned long cpu_enable_interrupt_save(void)
{
unsigned long flags;
asm volatile(
"mrs %0, daif // arch_local_irq_save\n"
"msr daifclr, #2"
: "=r" (flags)
:
: "memory");
return flags;
}
#endif /* defined(CONFIG_HAS_NMI) */
/* we not have "pause" instruction, instead "yield" instruction */