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Kernel: Add DAIF system register to aarch64 registers

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This register can be used to check whether the 4 different types of
interrupts are masked. A different variant can be used to set/clear
specific interrupt bits.
This commit is contained in:
Timon Kruiper 2022-05-16 13:23:55 +02:00 • committed by Linus Groh
parent 2fd5e9f729
commit 80be5f8044
1 changed files with 35 additions and 0 deletions
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35
Kernel/Arch/aarch64/Registers.h
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@ -487,4 +487,39 @@ struct ESR_EL1 {
};
static_assert(sizeof(ESR_EL1) == 8);
// https://developer.arm.com/documentation/ddi0601/2020-12/AArch64-Registers/DAIF--Interrupt-Mask-Bits?lang=en
// DAIF, Interrupt Mask Bits
struct DAIF {
u64 : 6;
u64 F : 1;
u64 I : 1;
u64 A : 1;
u64 D : 1;
u64 : 54;
static inline DAIF read()
{
DAIF daif;
asm("mrs %[value], daif"
: [value] "=r"(daif));
return daif;
}
// Clearing the I bit, causes interrupts to be enabled.
static inline void clear_I()
{
asm volatile("msr daifclr, #2" ::
:);
}
// Setting the I bit, causes interrupts to be disabled.
static inline void set_I()
{
asm volatile("msr daifset, #2" ::
:);
}
};
static_assert(sizeof(DAIF) == 8);
}