timer.cpp

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#include <cpu_io.h>
#include <opensbi_interface.h>
 
#include "arch.h"
#include "basic_info.hpp"
#include "interrupt.h"
#include "kernel.h"
#include "task_manager.hpp"
 
using InterruptDelegate = InterruptBase::InterruptDelegate;
namespace {
uint64_t interval{0};
 
auto TimerHandler(uint64_t /*cause*/, cpu_io::TrapContext* /*context*/)
    -> uint64_t {
  sbi_set_timer(cpu_io::Time::Read() + interval);
  TaskManagerSingleton::instance().TickUpdate();
  return 0;
}
}  // namespace
 
auto TimerInitSMP() -> void {
  // 开启时钟中断
  cpu_io::Sie::Stie::Set();
 
  // 设置初次时钟中断时间
  sbi_set_timer(cpu_io::Time::Read() + interval);
}
 
auto TimerInit() -> void {
  // 计算 interval
  interval = BasicInfoSingleton::instance().interval / SIMPLEKERNEL_TICK;
 
  // 注册时钟中断
  InterruptSingleton::instance().RegisterInterruptFunc(
      cpu_io::ScauseInfo::kSupervisorTimerInterrupt,
      InterruptDelegate::create<TimerHandler>());
 
  // 开启时钟中断
  cpu_io::Sie::Stie::Set();
 
  // 设置初次时钟中断时间
  sbi_set_timer(cpu_io::Time::Read() + interval);
}