arch.cpp File Reference

#include <cassert>
#include <cstring>
#include "cpu_io.h"
#include "per_cpu.hpp"
#include "task_manager.hpp"
#include "test_environment_state.hpp"
#include <stdio.h>

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Functions
void	switch_to (cpu_io::CalleeSavedContext *prev_ctx, cpu_io::CalleeSavedContext *next_ctx)
void	kernel_thread_entry ()
void	trap_return (void *)
void	trap_entry ()
void	InitTaskContext (cpu_io::CalleeSavedContext *task_context, void(*entry)(void *), void *arg, uint64_t stack_top)
	初始化内核线程的任务上下文（重载1）
void	InitTaskContext (cpu_io::CalleeSavedContext *task_context, cpu_io::TrapContext *trap_context_ptr, uint64_t stack_top)
	初始化用户线程的任务上下文（重载2）
void	etl_putchar (int c)
	早期控制台字符输出

Function Documentation

etl_putchar()

void etl_putchar

(

int

c

)

早期控制台字符输出

Copyright

Copyright The SimpleKernel Contributors

Parameters

c

要输出的字符

早期控制台字符输出

Copyright

Copyright The SimpleKernel Contributors

Definition at line 77 of file arch.cpp.

{ putchar(c); }

InitTaskContext() [1/2]

void InitTaskContext	(	cpu_io::CalleeSavedContext *	task_context,
		cpu_io::TrapContext *	trap_context_ptr,
		uint64_t	stack_top
	)		-> void

初始化用户线程的任务上下文（重载2）

Parameters

task_context	指向任务上下文的指针
trap_context_ptr	指向 Trap 上下文的指针
stack_top	内核栈顶地址

Precondition

task_context 不为 nullptr，trap_context_ptr 已填充用户态寄存器

Postcondition

task_context 已设置为经由 trap_return 返回用户态的状态

Todo:

x86_64 实现待补充

Definition at line 62 of file arch.cpp.

                                         {
  // 清零上下文
  std::memset(task_context, 0, sizeof(cpu_io::CalleeSavedContext));
 
  task_context->ReturnAddress() =
      reinterpret_cast<uint64_t>(kernel_thread_entry);
  task_context->EntryFunction() = reinterpret_cast<uint64_t>(trap_return);
  task_context->EntryArgument() = reinterpret_cast<uint64_t>(trap_context_ptr);
  task_context->StackPointer() = stack_top;
}

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InitTaskContext() [2/2]

void InitTaskContext	(	cpu_io::CalleeSavedContext *	task_context,
		void(*)(void *)	entry,
		void *	arg,
		uint64_t	stack_top
	)		-> void

初始化内核线程的任务上下文（重载1）

Parameters

task_context	指向任务上下文的指针
entry	线程入口函数
arg	传递给线程的参数
stack_top	内核栈顶地址

Precondition

task_context 不为 nullptr，stack_top 已按架构要求对齐

Postcondition

task_context 已设置为可被 switch_to 恢复的状态

Todo:

x86_64 实现待补充

Definition at line 50 of file arch.cpp.

                                                                          {
  // 清零上下文
  std::memset(task_context, 0, sizeof(cpu_io::CalleeSavedContext));
 
  task_context->ReturnAddress() =
      reinterpret_cast<uint64_t>(kernel_thread_entry);
  task_context->EntryFunction() = reinterpret_cast<uint64_t>(entry);
  task_context->EntryArgument() = reinterpret_cast<uint64_t>(arg);
  task_context->StackPointer() = stack_top;
}

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kernel_thread_entry()

void kernel_thread_entry

(

)

Definition at line 44 of file arch.cpp.

{}

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switch_to()

void switch_to	(	cpu_io::CalleeSavedContext *	prev_ctx,
		cpu_io::CalleeSavedContext *	next_ctx
	)

Copyright

Copyright The SimpleKernel Contributors

Definition at line 15 of file arch.cpp.

                                                   {
  auto* env_state =
      test_env::TestEnvironmentState::GetCurrentThreadEnvironment();
  assert(env_state &&
         "TestEnvironmentState not set for current thread. "
         "Did you forget to call SetCurrentThreadEnvironment()?");
 
  auto& core_env = env_state->GetCurrentCoreEnv();
 
  // 从上下文指针查找对应的任务
  auto* prev_task = env_state->FindTaskByContext(prev_ctx);
  auto* next_task = env_state->FindTaskByContext(next_ctx);
 
  // 获取 PerCpu 数据
  auto& per_cpu = per_cpu::GetCurrentCore();
 
  // 记录切换事件到环境层
  test_env::CoreEnvironment::SwitchEvent event;
  event.timestamp = (per_cpu.sched_data ? per_cpu.sched_data->local_tick : 0);
  event.from = prev_task;
  event.to = next_task;
  event.core_id = core_env.core_id;
  core_env.switch_history.push_back(event);
 
  // 更新 PerCpu 的当前线程
  per_cpu.running_task = next_task;
}

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trap_entry()

void trap_entry

(

)

Definition at line 46 of file arch.cpp.

{}

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trap_return()

void trap_return

(

void *

)

Definition at line 45 of file arch.cpp.

{}

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