parent
4fa568e527
commit
797d485b32
@ -0,0 +1,260 @@
|
||||
#ifndef _SCHED_H
|
||||
#define _SCHED_H
|
||||
|
||||
#define NR_TASKS 64
|
||||
#define HZ 100
|
||||
|
||||
#define FIRST_TASK task[0]
|
||||
#define LAST_TASK task[NR_TASKS-1]
|
||||
|
||||
#include <linux/head.h>
|
||||
#include <linux/fs.h>
|
||||
#include <linux/mm.h>
|
||||
#include <signal.h>
|
||||
|
||||
#if (NR_OPEN > 32)
|
||||
#error "Currently the close-on-exec-flags are in one word, max 32 files/proc"
|
||||
#endif
|
||||
|
||||
#define TASK_RUNNING 0
|
||||
#define TASK_INTERRUPTIBLE 1
|
||||
#define TASK_UNINTERRUPTIBLE 2
|
||||
#define TASK_ZOMBIE 3
|
||||
#define TASK_STOPPED 4
|
||||
|
||||
#ifndef NULL
|
||||
#define NULL ((void *) 0)
|
||||
#endif
|
||||
|
||||
extern int copy_page_tables(unsigned long from, unsigned long to, long size);
|
||||
extern int free_page_tables(unsigned long from, unsigned long size);
|
||||
|
||||
extern void sched_init(void);
|
||||
extern void schedule(void);
|
||||
extern void trap_init(void);
|
||||
extern void panic(const char * str);
|
||||
extern int tty_write(unsigned minor,char * buf,int count);
|
||||
|
||||
typedef int (*fn_ptr)();
|
||||
|
||||
struct i387_struct {
|
||||
long cwd;
|
||||
long swd;
|
||||
long twd;
|
||||
long fip;
|
||||
long fcs;
|
||||
long foo;
|
||||
long fos;
|
||||
long st_space[20]; /* 8*10 bytes for each FP-reg = 80 bytes */
|
||||
};
|
||||
|
||||
struct tss_struct {
|
||||
long back_link; /* 16 high bits zero */
|
||||
long esp0;
|
||||
long ss0; /* 16 high bits zero */
|
||||
long esp1;
|
||||
long ss1; /* 16 high bits zero */
|
||||
long esp2;
|
||||
long ss2; /* 16 high bits zero */
|
||||
long cr3;
|
||||
long eip;
|
||||
long eflags;
|
||||
long eax,ecx,edx,ebx;
|
||||
long esp;
|
||||
long ebp;
|
||||
long esi;
|
||||
long edi;
|
||||
long es; /* 16 high bits zero */
|
||||
long cs; /* 16 high bits zero */
|
||||
long ss; /* 16 high bits zero */
|
||||
long ds; /* 16 high bits zero */
|
||||
long fs; /* 16 high bits zero */
|
||||
long gs; /* 16 high bits zero */
|
||||
long ldt; /* 16 high bits zero */
|
||||
long trace_bitmap; /* bits: trace 0, bitmap 16-31 */
|
||||
struct i387_struct i387;
|
||||
};
|
||||
#define PROT_READ 0x1 /* page can be read */
|
||||
#define PROT_WRITE 0x2 /* page can be written */
|
||||
#define PROT_EXEC 0x4 /* page can be executed */
|
||||
#define PROT_SEM 0x8
|
||||
#define PROT_NONE 0x0 /* page can not be accessed */
|
||||
#define MAP_FILE 0
|
||||
#define MAP_SHARED 1 /* Share changes */
|
||||
#define MAP_PRIVATE 2 /* Changes are private */
|
||||
struct vmarea_struct{
|
||||
unsigned long vm_start;//虚拟地址开始的地址
|
||||
unsigned long vm_end;//虚拟地址结束的地址
|
||||
int mode;//页面权限
|
||||
int flag;//页面是否共享
|
||||
int size;//大小 需要与PAGE_SIZE对齐
|
||||
off_t off;//映射文件的偏移量
|
||||
struct vmarea_struct *next;//下一个vmarea_struct,链表结构比较简便,会牺牲一些速度
|
||||
//struct file *dir;//要映射文件的结构
|
||||
int fd;
|
||||
|
||||
};
|
||||
struct task_struct {
|
||||
/* these are hardcoded - don't touch */
|
||||
long state; /* -1 unrunnable, 0 runnable, >0 stopped */
|
||||
long counter;
|
||||
long priority;
|
||||
long signal;
|
||||
struct sigaction sigaction[32];
|
||||
long blocked; /* bitmap of masked signals */
|
||||
/* various fields */
|
||||
int exit_code;
|
||||
unsigned long start_code,end_code,end_data,brk,start_stack;
|
||||
long pid,father,pgrp,session,leader;
|
||||
unsigned short uid,euid,suid;
|
||||
unsigned short gid,egid,sgid;
|
||||
long alarm;
|
||||
long utime,stime,cutime,cstime,start_time;
|
||||
unsigned short used_math;
|
||||
/* file system info */
|
||||
int tty; /* -1 if no tty, so it must be signed */
|
||||
unsigned short umask;
|
||||
struct m_inode * pwd;
|
||||
struct m_inode * root;
|
||||
struct m_inode * executable;
|
||||
unsigned long close_on_exec;
|
||||
struct file * filp[NR_OPEN];
|
||||
/* ldt for this task 0 - zero 1 - cs 2 - ds&ss */
|
||||
struct desc_struct ldt[3];
|
||||
/* tss for this task */
|
||||
struct tss_struct tss;
|
||||
struct vmarea_struct *mmap;
|
||||
};
|
||||
|
||||
/*
|
||||
* INIT_TASK is used to set up the first task table, touch at
|
||||
* your own risk!. Base=0, limit=0x9ffff (=640kB)
|
||||
*/
|
||||
#define INIT_TASK \
|
||||
/* state etc */ { 0,15,15, \
|
||||
/* signals */ 0,{{},},0, \
|
||||
/* ec,brk... */ 0,0,0,0,0,0, \
|
||||
/* pid etc.. */ 0,-1,0,0,0, \
|
||||
/* uid etc */ 0,0,0,0,0,0, \
|
||||
/* alarm */ 0,0,0,0,0,0, \
|
||||
/* math */ 0, \
|
||||
/* fs info */ -1,0022,NULL,NULL,NULL,0, \
|
||||
/* filp */ {NULL,}, \
|
||||
{ \
|
||||
{0,0}, \
|
||||
/* ldt */ {0x9f,0xc0fa00}, \
|
||||
{0x9f,0xc0f200}, \
|
||||
}, \
|
||||
/*tss*/ {0,PAGE_SIZE+(long)&init_task,0x10,0,0,0,0,(long)&pg_dir,\
|
||||
0,0,0,0,0,0,0,0, \
|
||||
0,0,0x17,0x17,0x17,0x17,0x17,0x17, \
|
||||
_LDT(0),0x80000000, \
|
||||
{} \
|
||||
}, \
|
||||
/*mmap*/ NULL,\
|
||||
}
|
||||
|
||||
extern struct task_struct *task[NR_TASKS];
|
||||
extern struct task_struct *last_task_used_math;
|
||||
extern struct task_struct *current;
|
||||
extern long volatile jiffies;
|
||||
extern long startup_time;
|
||||
|
||||
#define CURRENT_TIME (startup_time+jiffies/HZ)
|
||||
|
||||
extern void add_timer(long jiffies, void (*fn)(void));
|
||||
extern void sleep_on(struct task_struct ** p);
|
||||
extern void interruptible_sleep_on(struct task_struct ** p);
|
||||
extern void wake_up(struct task_struct ** p);
|
||||
|
||||
/*
|
||||
* Entry into gdt where to find first TSS. 0-nul, 1-cs, 2-ds, 3-syscall
|
||||
* 4-TSS0, 5-LDT0, 6-TSS1 etc ...
|
||||
*/
|
||||
#define FIRST_TSS_ENTRY 4
|
||||
#define FIRST_LDT_ENTRY (FIRST_TSS_ENTRY+1)
|
||||
#define _TSS(n) ((((unsigned long) n)<<4)+(FIRST_TSS_ENTRY<<3))
|
||||
#define _LDT(n) ((((unsigned long) n)<<4)+(FIRST_LDT_ENTRY<<3))
|
||||
#define ltr(n) __asm__("ltr %%ax"::"a" (_TSS(n)))
|
||||
#define lldt(n) __asm__("lldt %%ax"::"a" (_LDT(n)))
|
||||
#define str(n) \
|
||||
__asm__("str %%ax\n\t" \
|
||||
"subl %2,%%eax\n\t" \
|
||||
"shrl $4,%%eax" \
|
||||
:"=a" (n) \
|
||||
:"a" (0),"i" (FIRST_TSS_ENTRY<<3))
|
||||
/*
|
||||
* switch_to(n) should switch tasks to task nr n, first
|
||||
* checking that n isn't the current task, in which case it does nothing.
|
||||
* This also clears the TS-flag if the task we switched to has used
|
||||
* tha math co-processor latest.
|
||||
*/
|
||||
#define switch_to(n) {\
|
||||
struct {long a,b;} __tmp; \
|
||||
__asm__("cmpl %%ecx,current\n\t" \
|
||||
"je 1f\n\t" \
|
||||
"movw %%dx,%1\n\t" \
|
||||
"xchgl %%ecx,current\n\t" \
|
||||
"ljmp *%0\n\t" \
|
||||
"cmpl %%ecx,last_task_used_math\n\t" \
|
||||
"jne 1f\n\t" \
|
||||
"clts\n" \
|
||||
"1:" \
|
||||
::"m" (*&__tmp.a),"m" (*&__tmp.b), \
|
||||
"d" (_TSS(n)),"c" ((long) task[n])); \
|
||||
}
|
||||
|
||||
#define PAGE_ALIGN(n) (((n)+0xfff)&0xfffff000)
|
||||
|
||||
#define _set_base(addr,base) \
|
||||
__asm__ ("push %%edx\n\t" \
|
||||
"movw %%dx,%0\n\t" \
|
||||
"rorl $16,%%edx\n\t" \
|
||||
"movb %%dl,%1\n\t" \
|
||||
"movb %%dh,%2\n\t" \
|
||||
"pop %%edx" \
|
||||
::"m" (*((addr)+2)), \
|
||||
"m" (*((addr)+4)), \
|
||||
"m" (*((addr)+7)), \
|
||||
"d" (base) \
|
||||
)
|
||||
|
||||
#define _set_limit(addr,limit) \
|
||||
__asm__ ("push %%edx\n\t" \
|
||||
"movw %%dx,%0\n\t" \
|
||||
"rorl $16,%%edx\n\t" \
|
||||
"movb %1,%%dh\n\t" \
|
||||
"andb $0xf0,%%dh\n\t" \
|
||||
"orb %%dh,%%dl\n\t" \
|
||||
"movb %%dl,%1\n\t" \
|
||||
"pop %%edx" \
|
||||
::"m" (*(addr)), \
|
||||
"m" (*((addr)+6)), \
|
||||
"d" (limit) \
|
||||
)
|
||||
|
||||
#define set_base(ldt,base) _set_base( ((char *)&(ldt)) , (base) )
|
||||
#define set_limit(ldt,limit) _set_limit( ((char *)&(ldt)) , (limit-1)>>12 )
|
||||
|
||||
static inline unsigned long _get_base(char * addr)
|
||||
{
|
||||
unsigned long __base;
|
||||
__asm__("movb %3,%%dh\n\t"
|
||||
"movb %2,%%dl\n\t"
|
||||
"shll $16,%%edx\n\t"
|
||||
"movw %1,%%dx"
|
||||
:"=&d" (__base)
|
||||
:"m" (*((addr)+2)),
|
||||
"m" (*((addr)+4)),
|
||||
"m" (*((addr)+7)));
|
||||
return __base;
|
||||
}
|
||||
|
||||
#define get_base(ldt) _get_base( ((char *)&(ldt)) )
|
||||
|
||||
#define get_limit(segment) ({ \
|
||||
unsigned long __limit; \
|
||||
__asm__("lsll %1,%0\n\tincl %0":"=r" (__limit):"r" (segment)); \
|
||||
__limit;})
|
||||
|
||||
#endif
|
||||
Loading…
Reference in new issue