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Kernel: Fix issues supporting HPETs with 32-bit-only main counter

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If the HPET main counter does not support full 64 bits, we should
not expect the upper 32 bit to work. This is a problem when writing
to the upper 32 bit of the comparator value, which requires the
TimerConfiguration::ValueSet bit to be set, but if it's not 64 bit
capable then the bit will not be cleared and leave it in a bad state.

Fixes #6990
This commit is contained in:
Tom 2021-05-11 21:20:06 -06:00 • committed by Andreas Kling
parent a6a57830d0
commit 3f9927b0c3
4 changed files with 51 additions and 18 deletions
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7
Kernel/Time/HPETComparator.cpp
View file

@ -11,18 +11,19 @@
namespace Kernel {
UNMAP_AFTER_INIT NonnullRefPtr<HPETComparator> HPETComparator::create(u8 number, u8 irq, bool periodic_capable)
UNMAP_AFTER_INIT NonnullRefPtr<HPETComparator> HPETComparator::create(u8 number, u8 irq, bool periodic_capable, bool is_64bit_capable)
{
auto timer = adopt_ref(*new HPETComparator(number, irq, periodic_capable));
auto timer = adopt_ref(*new HPETComparator(number, irq, periodic_capable, is_64bit_capable));
timer->register_interrupt_handler();
return timer;
}
UNMAP_AFTER_INIT HPETComparator::HPETComparator(u8 number, u8 irq, bool periodic_capable)
UNMAP_AFTER_INIT HPETComparator::HPETComparator(u8 number, u8 irq, bool periodic_capable, bool is_64bit_capable)
: HardwareTimer(irq)
, m_periodic(false)
, m_periodic_capable(periodic_capable)
, m_enabled(false)
, m_is_64bit_capable(is_64bit_capable)
, m_comparator_number(number)
{
}