timer.cpp

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#include <cpu_io.h>
 
#include "arch.h"
#include "basic_info.hpp"
#include "interrupt.h"
#include "kernel.h"
#include "kernel_fdt.hpp"
#include "task_manager.hpp"
 
using InterruptDelegate = InterruptBase::InterruptDelegate;
namespace {
uint64_t interval{0};
uint64_t timer_intid{0};
 
auto TimerHandler(uint64_t /*cause*/, cpu_io::TrapContext* /*context*/)
    -> uint64_t {
  cpu_io::CNTV_TVAL_EL0::Write(interval);
  TaskManagerSingleton::instance().TickUpdate();
  return 0;
}
}  // namespace
 
auto TimerInitSMP() -> void {
  InterruptSingleton::instance().Ppi(timer_intid, cpu_io::GetCurrentCoreId());
 
  cpu_io::CNTV_CTL_EL0::ENABLE::Clear();
  cpu_io::CNTV_CTL_EL0::IMASK::Set();
 
  cpu_io::CNTV_TVAL_EL0::Write(interval);
 
  cpu_io::CNTV_CTL_EL0::ENABLE::Set();
  cpu_io::CNTV_CTL_EL0::IMASK::Clear();
}
 
auto TimerInit() -> void {
  // 计算 interval
  interval = BasicInfoSingleton::instance().interval / SIMPLEKERNEL_TICK;
 
  // 获取定时器中断号
  timer_intid = KernelFdtSingleton::instance()
                    .GetAarch64Intid("arm,armv8-timer")
                    .value() +
                Gic::kPpiBase;
 
  InterruptSingleton::instance().RegisterInterruptFunc(
      timer_intid, InterruptDelegate::create<TimerHandler>());
 
  InterruptSingleton::instance().Ppi(timer_intid, cpu_io::GetCurrentCoreId());
 
  cpu_io::CNTV_CTL_EL0::ENABLE::Clear();
  cpu_io::CNTV_CTL_EL0::IMASK::Set();
 
  cpu_io::CNTV_TVAL_EL0::Write(interval);
 
  cpu_io::CNTV_CTL_EL0::ENABLE::Set();
  cpu_io::CNTV_CTL_EL0::IMASK::Clear();
}