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aarch64: enable userspace access to timer physical counter

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K. Lange 2022-08-30 17:12:49 +09:00
parent 1960006ec7
commit ce625f2137
1 changed files with 6 additions and 0 deletions
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6
kernel/arch/aarch64/main.c
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@ -457,6 +457,12 @@ void fpu_enable(void) {
asm volatile ("mrs %0, CPACR_EL1" : "=r"(cpacr_el1));
cpacr_el1 |= (3 << 20) | (3 << 16);
asm volatile ("msr CPACR_EL1, %0" :: "r"(cpacr_el1));
/* Enable access to physical timer */
uint64_t clken = 0;
asm volatile ("mrs %0,CNTKCTL_EL1" : "=r"(clken));
clken |= (1 << 0);
asm volatile ("msr CNTKCTL_EL1,%0" :: "r"(clken));
}
/**