整理文件夹
我们把所有的东西都放到了main.c中，一开始代码量很小其实无所谓，但随着代码量的增加我们有必要分门别类整理一下了
首先将下面代码放到io.h中
//读port端口
#define inb(port) ({ \
unsigned char _v; \
__asm__ volatile ("inb %%dx,%%al":"=a" (_v):"d" (port)); \
_v; \
})
//带延时的向port端口写value，用两条跳转语句做延时
#define outb_p(value,port) \
__asm__ ("outb %%al,%%dx\n" \
"\tjmp 1f\n" \
"1:\tjmp 1f\n" \
"1:"::"a" (value),"d" (port))
//带延时的读port端口
#define inb_p(port) ({ \
unsigned char _v; \
__asm__ volatile ("inb %%dx,%%al\n" \
"\tjmp 1f\n" \
"1:\tjmp 1f\n" \
"1:":"=a" (_v):"d" (port)); \
_v; \
})
将下面的代码放到system.h中
#define set_registers() \
__asm__ ("movl $0x17,%%eax\n\t" \
"movw %%ax,%%ds\n\t" \
"movw %%ax,%%es\n\t" \
"movw %%ax,%%fs\n\t" \
"movw $0x18,%%ax\n\t" \
"movw %%ax,%%gs" \
:::"ax")
#define set_stack_registers() \
__asm__ ("movl $0x10,%%eax\n\t" \
"movw %%ax,%%ds\n\t" \
"movw %%ax,%%es\n\t" \
"movw %%ax,%%ss\n\t" \
"lss stack_start,%%esp"\
:::"ax")
#define move_to_user_mode2() \
__asm__ ("movl %%esp,%%eax\n\t" \
"pushl $0x17\n\t" \
"pushl %%eax\n\t" \
"pushfl\n\t"\
"pushl $0xf\n\t" \
"pushl $testA\n\t" \
"iret\n" \
:::"ax")
#define move_to_user_mode() \
__asm__ ("movl %%esp,%%eax\n\t" \
"pushl $0x17\n\t" \
"pushl %%eax\n\t" \
"pushfl\n\t" \
"pushl $0x0f\n\t" \
"pushl $1f\n\t" \
"iret\n" \
"1:\tmovl $0x17,%%eax\n\t" \
"movw %%ax,%%ds\n\t" \
"movw %%ax,%%es\n\t" \
"movw %%ax,%%fs\n\t" \
"movw $0x18,%%ax\n\t" \
"movw %%ax,%%gs" \
:::"ax")
下面代码放到head.h中
typedef unsigned int u32;
typedef unsigned short u16;
typedef unsigned char u8;
typedef struct Descriptor
{
u16 limit_low; /* Limit */
u16 base_low; /* Base */
u8 base_mid; /* Base */
u8 attr1; /* P(1) DPL(2) DT(1) TYPE(4) */
u8 limit_high_attr2; /* G(1) D(1) 0(1) AVL(1) LimitHigh(4) */
u8 base_high; /* Base */
}DESCRIPTOR;
#define DA_C 0x98
#define DA_32 0x4000
#define DA_DPL3 0x60
#define DA_DPL0 0x00
#define DA_DRWA 0x93
#define DA_DRW 0x92
#define SA_RPL3 3
#define DA_CR 0x9A
#define DA_LIMIT_4K 0x8000
#define DA_386TSS 0x89
#define DA_LDT 0x82
在include\linux下新建一个文件sched.h
#ifndef _SCHED_H
#define _SCHED_H
typedef struct tss_struct {
u32 backlink;
u32 esp0; /* stack pointer to use during interrupt */
u32 ss0; /* " segment " " " " */
u32 esp1;
u32 ss1;
u32 esp2;
u32 ss2;
u32 cr3;
u32 eip;
u32 flags;
u32 eax;
u32 ecx;
u32 edx;
u32 ebx;
u32 esp;
u32 ebp;
u32 esi;
u32 edi;
u32 es;
u32 cs;
u32 ss;
u32 ds;
u32 fs;
u32 gs;
u32 ldt;
u16 trap;
u16 iobase; /* I/O位图基址大于或等于TSS段界限，就表示没有I/O许可位图 */
}TSS;
#define FIRST_TSS_ENTRY 4
#define FIRST_LDT_ENTRY 5
#define _TSS(n) ((((unsigned long) n)<<4)+(FIRST_TSS_ENTRY<<3))
#define switch_to(n) {\
struct {long a,b;} __tmp; \
__asm__("movw %%dx,%1\n\t" \
"ljmp %0\n\t" \
::"m" (*&__tmp.a),"m" (*&__tmp.b), \
"d" (_TSS(n))); \
}
#define PAGE_SIZE 4096
#define NR_TASKS 64
struct task_struct {
long state;
long pid,father;
struct desc_struct ldt[3];
/* tss for this task */
struct tss_struct tss;
};
union task_union {
struct task_struct task;
char stack[PAGE_SIZE];
};
struct stack_struct{
char stack[256];
int top;
};
#define INIT_TASK \
{ 0,0,0,\
{ \
{0,0}, \
/* ldt */ {0x9f,0xc0fa00}, \
{0x9f,0xc0f200}, \
}, \
/*tss*/ {\
}, \
}
#define lldt() \
__asm__ ("movw $0x28,%%ax\n\t" \
"lldt %%ax\n\t" \
:::"ax")
#define ltr() \
__asm__ ("movw $0x20,%%ax\n\t" \
"ltr %%ax\n\t" \
:::"ax")
extern void registe_task(union task_union * task,struct stack_struct *stack,void *test);
extern long volatile jiffies;
typedef struct {
long * a;
short b;
} STACK_START;
extern STACK_START stack_start;
#endif
在kernel中新建chr_drv文件夹，并将keyboard.S移到这里，然后新建console.c、key_board.c、Makefile
chr_drv中的console.c
#include <linux/head.h>
#include <asm/system.h>
#include <asm/io.h>
extern void keyboard_interrupt(void);
void con_init(void)
{
register unsigned char a;
set_trap_gate(0x21,&keyboard_interrupt);
outb_p(inb_p(0x21)&0xfd,0x21);
a=inb_p(0x61);
outb_p(a|0x80,0x61);
outb(a,0x61);
}
chr_drv中的key_board.c
#include <asm/io.h>
void none(void)
{
disp_str("none");
}
void do_self(void)
{
disp_str("do_self");
}
void ctrl(void)
{
disp_str("ctrl");
}
void lshift(void)
{
disp_str("lshift");
}
void rshift(void)
{
disp_str("rshift");
}
void minus(void)
{
disp_str("minus");
}
void alt(void)
{
disp_str("alt");
}
void caps(void)
{
disp_str("caps");
}
void func(void)
{
disp_str("func");
}
void num(void)
{
disp_str("num");
}
void scroll(void)
{
disp_str("scroll");
}
void cursor(void)
{
disp_str("cursor");
}
void unctrl(void)
{
disp_str("unctrl");
}
void unlshift(void)
{
disp_str("unlshift");
}
void unrshift(void)
{
disp_str("unrshift");
}
void unalt(void)
{
disp_str("unalt");
}
void uncaps(void)
{
disp_str("uncaps");
}
typedef void (*function)(void);
#define Function(address) (*(function)address)()
static function key_table[] =
{
none,do_self,do_self,do_self /* 00-03 s0 esc 1 2 */
,do_self,do_self,do_self,do_self /* 04-07 3 4 5 6 */
,do_self,do_self,do_self,do_self /* 08-0B 7 8 9 0 */
,do_self,do_self,do_self,do_self /* 0C-0F + ' bs tab */
,do_self,do_self,do_self,do_self /* 10-13 q w e r */
,do_self,do_self,do_self,do_self /* 14-17 t y u i */
,do_self,do_self,do_self,do_self /* 18-1B o p } ^ */
,do_self,ctrl,do_self,do_self /* 1C-1F enter ctrl a s */
,do_self,do_self,do_self,do_self /* 20-23 d f g h */
,do_self,do_self,do_self,do_self /* 24-27 j k l | */
,do_self,do_self,lshift,do_self /* 28-2B { para lshift , */
,do_self,do_self,do_self,do_self /* 2C-2F z x c v */
,do_self,do_self,do_self,do_self /* 30-33 b n m , */
,do_self,minus,rshift,do_self /* 34-37 . - rshift * */
,alt,do_self,caps,func /* 38-3B alt sp caps f1 */
,func,func,func,func /* 3C-3F f2 f3 f4 f5 */
,func,func,func,func /* 40-43 f6 f7 f8 f9 */
,func,num,scroll,cursor /* 44-47 f10 num scr home */
,cursor,cursor,do_self,cursor /* 48-4B up pgup - left */
,cursor,cursor,do_self,cursor /* 4C-4F n5 right + end */
,cursor,cursor,cursor,cursor /* 50-53 dn pgdn ins del */
,none,none,do_self,func /* 54-57 sysreq ? < f11 */
,func,none,none,none /* 58-5B f12 ? ? ? */
,none,none,none,none /* 5C-5F ? ? ? ? */
,none,none,none,none /* 60-63 ? ? ? ? */
,none,none,none,none /* 64-67 ? ? ? ? */
,none,none,none,none /* 68-6B ? ? ? ? */
,none,none,none,none /* 6C-6F ? ? ? ? */
,none,none,none,none /* 70-73 ? ? ? ? */
,none,none,none,none /* 74-77 ? ? ? ? */
,none,none,none,none /* 78-7B ? ? ? ? */
,none,none,none,none /* 7C-7F ? ? ? ? */
,none,none,none,none /* 80-83 ? br br br */
,none,none,none,none /* 84-87 br br br br */
,none,none,none,none /* 88-8B br br br br */
,none,none,none,none /* 8C-8F br br br br */
,none,none,none,none /* 90-93 br br br br */
,none,none,none,none /* 94-97 br br br br */
,none,none,none,none /* 98-9B br br br br */
,none,unctrl,none,none /* 9C-9F br unctrl br br */
,none,none,none,none /* A0-A3 br br br br */
,none,none,none,none /* A4-A7 br br br br */
,none,none,unlshift,none /* A8-AB br br unlshift br */
,none,none,none,none /* AC-AF br br br br */
,none,none,none,none /* B0-B3 br br br br */
,none,none,unrshift,none /* B4-B7 br br unrshift br */
,unalt,none,uncaps,none /* B8-BB unalt br uncaps br */
,none,none,none,none /* BC-BF br br br br */
,none,none,none,none /* C0-C3 br br br br */
,none,none,none,none /* C4-C7 br br br br */
,none,none,none,none /* C8-CB br br br br */
,none,none,none,none /* CC-CF br br br br */
,none,none,none,none /* D0-D3 br br br br */
,none,none,none,none /* D4-D7 br br br br */
,none,none,none,none /* D8-DB br ? ? ? */
,none,none,none,none /* DC-DF ? ? ? ? */
,none,none,none,none /* E0-E3 e0 e1 ? ? */
,none,none,none,none /* E4-E7 ? ? ? ? */
,none,none,none,none /* E8-EB ? ? ? ? */
,none,none,none,none /* EC-EF ? ? ? ? */
,none,none,none,none /* F0-F3 ? ? ? ? */
,none,none,none,none /* F4-F7 ? ? ? ? */
,none,none,none,none /* F8-FB ? ? ? ? */
,none,none,none,none /* FC-FF ? ? ? ? */
};
void do_keyboard(void)
{
register unsigned char scan_code;
scan_code=inb_p(0x60);
if(scan_code==0xe0)
{
disp_str("0xe0");
}
else if(scan_code==0xe1)
{
disp_str("0xe1");
}
else
{
key_table[scan_code]();
}
}
makefile
# Makefile for the simple example kernel. AS =as LD =ld LDFLAGS = --oformat binary -N -e start -Ttext 0x0 CC =gcc CFLAGS = -I../../include .c.s: $(CC) $(CFLAGS) \ -S -o $*.s $< .s.o: $(AS) -c -o $*.o $< .c.o: $(CC) $(CFLAGS) \ -c -o $*.o $< OBJS = keyboard.o key_board.o console.o chr_drv.o:$(OBJS) $(LD) -r -o chr_drv.o $(OBJS) sync clean: rm -f *.o *.s
kernel目录下新建sched.c
#include <linux/head.h>
#include <linux/sched.h>
int current_task=0;
unsigned int TOTAL_TASK=0;
long volatile jiffies=0;
long user_stack [ PAGE_SIZE>>2 ] ;
STACK_START stack_start = { & user_stack [PAGE_SIZE>>2] , 0x20 };
void do_timer(void)
{
int next_task = current_task+1;
if(next_task>TOTAL_TASK-1)
next_task = 0;
if(next_task!=current_task){
current_task=next_task;
switch_to(next_task);
}
}
void registe_task(union task_union * task,struct stack_struct *stack,void *process)
{
//填充task1的TSS
task->task.tss.backlink = 0;
task->task.tss.esp0=PAGE_SIZE+(long)task;
task->task.tss.ss0=0x10;
task->task.tss.eip=process;
task->task.tss.esp = &stack->top;
task->task.tss.flags=0x200;
task->task.tss.es=0x17;
task->task.tss.cs=0xf;
task->task.tss.ss=0x17;
task->task.tss.ds=0x17;
task->task.tss.fs=0x17;
task->task.tss.gs=0x18;
task->task.tss.ldt=(FIRST_LDT_ENTRY+TOTAL_TASK*2)*8;
task->task.tss.trap=0x8000;
task->task.tss.iobase=0x0;
//init_task的LDT 0x28
_set_gdt_desc(&gdt[FIRST_LDT_ENTRY+TOTAL_TASK*2],&(task->task.ldt[0]),0x40,DA_LDT);
//task1的TSS 0x30
_set_gdt_desc(&gdt[FIRST_TSS_ENTRY+TOTAL_TASK*2],&(task->task.tss),0x68,DA_386TSS+DA_DPL3);
TOTAL_TASK++;
}
kernel目录下新建Makefile
# Makefile for the simple example kernel. AS =as LD =ld LDFLAGS = --oformat binary -N -e start -Ttext 0x0 CC =gcc CFLAGS = -I../include .c.s: $(CC) $(CFLAGS) \ -S -o $*.s $< .s.o: $(AS) -c -o $*.o $< .c.o: $(CC) $(CFLAGS) \ -c -o $*.o $< OBJS = asm.o kliba.o System_call.o chr_drv/chr_drv.o Traps.o sched.o kernel.o:$(OBJS) $(LD) -r -o kernel.o $(OBJS) sync chr_drv/chr_drv.o: (cd chr_drv; make) clean: rm -f *.o *.s (cd chr_drv;make clean)
顶层Makefile修改成这样
# Makefile for the simple example kernel. AS =as LD =ld LDFLAGS = --oformat binary -N -e start -Ttext 0x0 all:Image Image:boot/bootsect boot/setup system cat boot/bootsect boot/setup system >Image boot/bootsect:boot/bootsect.s $(AS) -o boot/bootsect.o -a boot/bootsect.s $(LD) $(LDFLAGS) -o boot/bootsect boot/bootsect.o boot/setup:boot/setup.s $(AS) -o boot/setup.o -a boot/setup.s $(LD) $(LDFLAGS) -o boot/setup boot/setup.o boot/head.o:boot/head.s $(AS) -o boot/head.o -a boot/head.s init/main.o: init/main.c gcc -Iinclude -c -o init/main.o init/main.c kernel/kernel.o: (cd kernel; make) system: boot/head.o init/main.o kernel/kernel.o $(LD) $(LDFLAGS) -o system boot/head.o kernel/kernel.o init/main.o clean: rm -f Image system *.o *.s rm -f boot/head.o boot/setup boot/bootsect rm -f init/*.o (cd kernel; make clean)
整理后的main.c
#include <linux/head.h>
#include <asm/system.h>
#include <asm/io.h>
#include <linux/sched.h>
void disp_str(char *info);
extern void timer_interrupt(void);
static union task_union init_task = {INIT_TASK,};
struct stack_struct stack0;
struct stack_struct stack1;
static union task_union task1 = {INIT_TASK,};
void delay(int time)
{
int i, j, k;
for (k = 0; k < time; k++) {
for (i = 0; i < 10; i++) {
for (j = 0; j < 10000; j++) {}
}
}
}
void testC(void)
{
while(1){
disp_str("C");
delay(2);
}
}
void _set_gdt_desc(struct desc_struct *descriptor_addr,u32 base,u32 limit,u16 attr)
{
DESCRIPTOR *descriptor = (DESCRIPTOR *)descriptor_addr;
descriptor->limit_low = limit & 0x0FFFF;
descriptor->base_low = base & 0x0FFFF;
descriptor->base_mid = (base >> 16) & 0x0FF;
descriptor->attr1 = attr & 0xFF;
descriptor->limit_high_attr2= ((limit>>16) & 0x0F) | (attr>>8) & 0xF0;
descriptor->base_high = (base >> 24) & 0x0FF;
}
void rebuid_gdt(void)
{
_set_gdt_desc(&gdt[1],0x0000,0x7ff,DA_CR+DA_32+DA_LIMIT_4K);
//堆栈段 0x10
_set_gdt_desc(&gdt[2],0x0000,0x7ff,DA_DRW+DA_32+DA_LIMIT_4K);
//视频段 0x18
_set_gdt_desc(&gdt[3],0xb8000,0x2,DA_DRW+DA_32+DA_DPL3+DA_LIMIT_4K);
}
void timer_init(void)
{
set_intr_gate(32,&timer_interrupt);
}
void main(void)
{
disp_str("How old are you?\n");
con_init();
timer_init();
rebuid_gdt();
stack_start.b=0x10;
set_stack_registers();
registe_task(&init_task,&stack0,0);
registe_task(&task1,&stack1,&testC);
ltr();//加载tss
lldt();//加载ldt
sti();//开中断
move_to_user_mode();
while(1){
disp_str("M");
delay(2);
}
}