Linux0.96c/include/linux/sched.h
#ifndef _SCHED_H
#define _SCHED_H
#define HZ 100
#define NR_TASKS 64
#define TASK_SIZE 0x04000000
#define LIBRARY_SIZE 0x00400000
/*
* Size of io_bitmap in longwords: 32 is ports 0-0x3ff.
*/
#define IO_BITMAP_SIZE 32
#if (TASK_SIZE & 0x3fffff)
#error "TASK_SIZE must be multiple of 4M"
#endif
#if (LIBRARY_SIZE & 0x3fffff)
#error "LIBRARY_SIZE must be a multiple of 4M"
#endif
#if (LIBRARY_SIZE >= (TASK_SIZE/2))
#error "LIBRARY_SIZE too damn big!"
#endif
#if (((TASK_SIZE>>16)*NR_TASKS) != 0x10000)
#error "TASK_SIZE*NR_TASKS must be 4GB"
#endif
#define LIBRARY_OFFSET (TASK_SIZE - LIBRARY_SIZE)
#define CT_TO_SECS(x) ((x) / HZ)
#define CT_TO_USECS(x) (((x) % HZ) * 1000000/HZ)
#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 <sys/param.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <signal.h>
#if (NR_OPEN > 32)
#error "Currently the close-on-exec-flags and select masks are in one long, 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
#define MAX_SHARED_LIBS 6
extern void sched_init(void);
extern void show_state(void);
extern void schedule(void);
extern void trap_init(void);
extern void panic(const char * str);
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 {
unsigned long back_link; /* 16 high bits zero */
unsigned long esp0;
unsigned long ss0; /* 16 high bits zero */
unsigned long esp1;
unsigned long ss1; /* 16 high bits zero */
unsigned long esp2;
unsigned long ss2; /* 16 high bits zero */
unsigned long cr3;
unsigned long eip;
unsigned long eflags;
unsigned long eax,ecx,edx,ebx;
unsigned long esp;
unsigned long ebp;
unsigned long esi;
unsigned long edi;
unsigned long es; /* 16 high bits zero */
unsigned long cs; /* 16 high bits zero */
unsigned long ss; /* 16 high bits zero */
unsigned long ds; /* 16 high bits zero */
unsigned long fs; /* 16 high bits zero */
unsigned long gs; /* 16 high bits zero */
unsigned long ldt; /* 16 high bits zero */
unsigned long trace_bitmap; /* bits: trace 0, bitmap 16-31 */
unsigned long io_bitmap[IO_BITMAP_SIZE];
struct i387_struct i387;
};
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;
int dumpable;
unsigned long start_code,end_code,end_data,brk,start_stack;
long pid,pgrp,session,leader;
int groups[NGROUPS];
/*
* pointers to (original) parent process, youngest child, younger sibling,
* older sibling, respectively. (p->father can be replaced with
* p->p_pptr->pid)
*/
struct task_struct *p_opptr,*p_pptr, *p_cptr, *p_ysptr, *p_osptr;
/*
* sleep makes a singly linked list with this.
*/
struct task_struct *next_wait;
unsigned short uid,euid,suid;
unsigned short gid,egid,sgid;
unsigned long timeout;
unsigned long it_real_value, it_prof_value, it_virt_value;
unsigned long it_real_incr, it_prof_incr, it_virt_incr;
long utime,stime,cutime,cstime,start_time;
unsigned long min_flt, maj_flt;
unsigned long cmin_flt, cmaj_flt;
struct rlimit rlim[RLIM_NLIMITS];
unsigned int flags; /* per process flags, defined below */
unsigned short used_math;
unsigned short rss; /* number of resident pages */
char comm[8];
/* file system info */
int link_count;
int tty; /* -1 if no tty, so it must be signed */
unsigned short umask;
struct inode * pwd;
struct inode * root;
struct inode * executable;
struct {
struct inode * library;
unsigned long start;
unsigned long length;
} libraries[MAX_SHARED_LIBS];
int numlibraries;
struct file * filp[NR_OPEN];
unsigned long close_on_exec;
/* ldt for this task 0 - zero 1 - cs 2 - ds&ss */
struct desc_struct ldt[3];
/* tss for this task */
struct tss_struct tss;
};
/*
* Per process flags
*/
#define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
/* Not implemented yet, only for 486*/
#define PF_PTRACED 0x00000010 /* set if ptrace (0) has been called. */
#define PF_VM86 0x00000020 /* set if process can execute a vm86 */
/* task. */
/* not impelmented. */
/*
* 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... */ 0,0,0,0,0,0,0, \
/* pid etc.. */ 0,0,0,0, \
/* suppl grps*/ {NOGROUP,}, \
/* proc links*/ &init_task.task,&init_task.task,NULL,NULL,NULL,NULL, \
/* uid etc */ 0,0,0,0,0,0, \
/* timeout */ 0,0,0,0,0,0,0,0,0,0,0,0, \
/* min_flt */ 0,0,0,0, \
/* rlimits */ { {0x7fffffff, 0x7fffffff}, {0x7fffffff, 0x7fffffff}, \
{0x7fffffff, 0x7fffffff}, {0x7fffffff, 0x7fffffff}, \
{0x7fffffff, 0x7fffffff}, {0x7fffffff, 0x7fffffff}}, \
/* flags */ 0, \
/* math */ 0, \
/* rss */ 2, \
/* comm */ "swapper", \
/* fs info */ 0,-1,0022,NULL,NULL,NULL, \
/* libraries */ { { NULL, 0, 0}, }, 0, \
/* filp */ {NULL,}, 0, \
{ \
{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,{0xffffffff}, \
{} \
}, \
}
extern struct task_struct *task[NR_TASKS];
extern struct task_struct *last_task_used_math;
extern struct task_struct *current;
extern unsigned long volatile jiffies;
extern unsigned long startup_time;
extern int jiffies_offset;
#define CURRENT_TIME (startup_time+(jiffies+jiffies_offset)/HZ)
extern void add_timer(long jiffies, void (*fn)(void));
extern void sleep_on(struct task_struct ** p);
extern int send_sig(long sig,struct task_struct * p,int priv);
extern void interruptible_sleep_on(struct task_struct ** p);
extern void wake_up(struct task_struct ** p);
extern int in_group_p(gid_t grp);
/*
* 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) \
:"0" (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]) \
:"cx"); \
}
#define PAGE_ALIGN(n) (((n)+0xfff)&0xfffff000)
#define _set_base(addr,base) \
__asm__("movw %%dx,%0\n\t" \
"rorl $16,%%edx\n\t" \
"movb %%dl,%1\n\t" \
"movb %%dh,%2" \
::"m" (*((addr)+2)), \
"m" (*((addr)+4)), \
"m" (*((addr)+7)), \
"d" (base) \
:"dx")
#define _set_limit(addr,limit) \
__asm__("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" \
::"m" (*(addr)), \
"m" (*((addr)+6)), \
"d" (limit) \
:"dx")
#define set_base(ldt,base) _set_base( ((char *)&(ldt)) , base )
#define set_limit(ldt,limit) _set_limit( ((char *)&(ldt)) , (limit-1)>>12 )
static unsigned long inline _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)) )
static unsigned long inline get_limit(unsigned long segment)
{
unsigned long __limit;
__asm__("lsll %1,%0"
:"=r" (__limit):"r" (segment));
return __limit+1;
}
#define REMOVE_LINKS(p) \
if ((p)->p_osptr) \
(p)->p_osptr->p_ysptr = (p)->p_ysptr; \
if ((p)->p_ysptr) \
(p)->p_ysptr->p_osptr = (p)->p_osptr; \
else \
(p)->p_pptr->p_cptr = (p)->p_osptr
#define SET_LINKS(p) \
(p)->p_ysptr = NULL; \
if ((p)->p_osptr = (p)->p_pptr->p_cptr) \
(p)->p_osptr->p_ysptr = p; \
(p)->p_pptr->p_cptr = p
#endif