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Kernel/riscv64: Read the timebase-frequency from the device tree

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Hendiadyoin1 2024-02-11 16:00:17 +01:00 committed by Andrew Kaster
parent 3941277940
commit 53dd04e219
Notes: sideshowbarker 2024-07-17 20:58:35 +09:00 
Author: https://github.com/Hendiadyoin1
Commit: https://github.com/SerenityOS/serenity/commit/53dd04e219
Pull-request: https://github.com/SerenityOS/serenity/pull/22948
Reviewed-by: https://github.com/ADKaster
Reviewed-by: https://github.com/kleinesfilmroellchen
Reviewed-by: https://github.com/spholz
1 changed files with 2 additions and 4 deletions
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6
Kernel/Arch/riscv64/Timer.cpp
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@ -6,6 +6,7 @@
#include <AK/Format.h>
#include <AK/NeverDestroyed.h>
#include <Kernel/Arch/riscv64/CPU.h>
#include <Kernel/Arch/riscv64/SBI.h>
#include <Kernel/Arch/riscv64/Timer.h>
@ -14,10 +15,7 @@ namespace Kernel::RISCV64 {
Timer::Timer()
: HardwareTimer(to_underlying(CSR::SCAUSE::SupervisorTimerInterrupt) & ~CSR::SCAUSE_INTERRUPT_MASK)
{
// FIXME: Actually query the frequency of the timer from the device tree.
// Based on the "/cpus/timebase-frequency" device tree node for the QEMU virt machine
m_frequency = 10'000'000; // in Hz
m_frequency = DeviceTree::get().resolve_property("/cpus/timebase-frequency"sv).value().as<u32>();
m_interrupt_interval = m_frequency / OPTIMAL_TICKS_PER_SECOND_RATE;