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