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🆕 syscall模块，实现了第一个系统调用函数sys_printf

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fslongjin
2022-02-16 14:07:53 +08:00
parent 7238e3c13a
commit d3a5048f66
11 changed files with 219 additions and 8 deletions
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16
kernel/process/process.c
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@ -3,6 +3,8 @@
#include "../exception/gate.h"
#include "../common/printk.h"
#include "../common/kprint.h"
#include "../syscall/syscall.h"
#include "../syscall/syscall_num.h"
/**
* @brief 切换进程
@ -28,6 +30,7 @@ void __switch_to(struct process_control_block *prev, struct process_control_bloc
__asm__ __volatile__("movq %0, %%gs \n\t" ::"a"(next->thread->gs));
}
/**
* @brief 这是一个用户态的程序
*
@ -35,7 +38,13 @@ void __switch_to(struct process_control_block *prev, struct process_control_bloc
void user_level_function()
{
kinfo("Program (user_level_function) is runing...");
kinfo("Try to enter syscall id 15...");
enter_syscall(15,0,0,0,0,0,0,0,0);
enter_syscall(SYS_PRINTF, (ul)"test_sys_printf\n", 0,0,0,0,0,0,0);
kinfo("Return from syscall id 15...");
while(1);
}
/**
@ -169,6 +178,10 @@ int kernel_thread(unsigned long (*fn)(unsigned long), unsigned long arg, unsigne
return do_fork(&regs, flags, 0, 0);
}
/**
* @brief 初始化进程模块
* ☆前置条件：已完成系统调用模块的初始化
*/
void process_init()
{
@ -188,8 +201,7 @@ void process_init()
initial_mm.stack_start = _stack_start;
// 向MSR寄存器组中的 IA32_SYSENTER_CS寄存器写入内核的代码段的地址
wrmsr(0x174, KERNEL_CS);
// 初始化进程和tss
set_TSS64(initial_thread.rbp, initial_tss[0].rsp1, initial_tss[0].rsp2, initial_tss[0].ist1, initial_tss[0].ist2, initial_tss[0].ist3, initial_tss[0].ist4, initial_tss[0].ist5, initial_tss[0].ist6, initial_tss[0].ist7);

3
kernel/process/process.h
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@ -13,11 +13,12 @@
#include "../common/cpu.h"
#include "../common/glib.h"
#include "../mm/mm.h"
#include "../syscall/syscall.h"
#include "ptrace.h"
extern unsigned long _stack_start; // 导出内核层栈基地址（定义在head.S）
extern void ret_from_intr(void); // 导出从中断返回的函数（定义在entry.S）
extern void ret_from_system_call(void); // 导出从中断返回的函数（定义在entry.S）
// 进程的内核栈大小 32K
#define STACK_SIZE 32768