diff options
Diffstat (limited to 'arch/arm64/kernel')
| -rw-r--r-- | arch/arm64/kernel/traps.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c index 1d6e418c4..107b25502 100644 --- a/arch/arm64/kernel/traps.c +++ b/arch/arm64/kernel/traps.c @@ -404,11 +404,23 @@ static void cntvct_read_handler(unsigned int esr, struct pt_regs *regs) regs->pc += 4; } +static void cntfrq_read_handler(unsigned int esr, struct pt_regs *regs) +{ + int rt = (esr & ESR_ELx_SYS64_ISS_RT_MASK) >> ESR_ELx_SYS64_ISS_RT_SHIFT; + + if (rt != 31) + asm volatile("mrs %0, cntfrq_el0" : "=r" (regs->regs[rt])); + regs->pc += 4; +} + asmlinkage void __exception do_sysinstr(unsigned int esr, struct pt_regs *regs) { if ((esr & ESR_ELx_SYS64_ISS_SYS_OP_MASK) == ESR_ELx_SYS64_ISS_SYS_CNTVCT) { cntvct_read_handler(esr, regs); return; + } else if ((esr & ESR_ELx_SYS64_ISS_SYS_OP_MASK) == ESR_ELx_SYS64_ISS_SYS_CNTFRQ) { + cntfrq_read_handler(esr, regs); + return; } do_undefinstr(regs); |