#ifndef _LINUX_SCHED_H
#define _LINUX_SCHED_H

/*
 * define DEBUG if you want the wait-queues to have some extra
 * debugging code. It's not normally used, but might catch some
 * wait-queue coding errors.
 *
 *  #define DEBUG
 */

#include <asm/param.h>  /* for HZ */

extern unsigned long intr_count;
extern unsigned long event;

#include <linux/binfmts.h>
#include <linux/personality.h>
#include <linux/tasks.h>
#include <linux/kernel.h>
#include <asm/system.h>

/*
 * These are the constant used to fake the fixed-point load-average
 * counting. Some notes:
 *  - 11 bit fractions expand to 22 bits by the multiplies: this gives
 *    a load-average precision of 10 bits integer + 11 bits fractional
 *  - if you want to count load-averages more often, you need more
 *    precision, or rounding will get you. With 2-second counting freq,
 *    the EXP_n values would be 1981, 2034 and 2043 if still using only
 *    11 bit fractions.
 */
extern unsigned long avenrun[];         /* Load averages */

#define FSHIFT          11              /* nr of bits of precision */
#define FIXED_1         (1<<FSHIFT)     /* 1.0 as fixed-point */
#define LOAD_FREQ       (5*HZ)          /* 5 sec intervals */
#define EXP_1           1884            /* 1/exp(5sec/1min) as fixed-point */
#define EXP_5           2014            /* 1/exp(5sec/5min) */
#define EXP_15          2037            /* 1/exp(5sec/15min) */

#define CALC_LOAD(load,exp,n) \
        load *= exp; \
        load += n*(FIXED_1-exp); \
        load >>= FSHIFT;

#define CT_TO_SECS(x)   ((x) / HZ)
#define CT_TO_USECS(x)  (((x) % HZ) * 1000000/HZ)

extern int nr_running, nr_tasks;

#define FIRST_TASK task[0]
#define LAST_TASK task[NR_TASKS-1]

#include <linux/head.h>
#include <linux/fs.h>
#include <linux/signal.h>
#include <linux/time.h>
#include <linux/param.h>
#include <linux/resource.h>
#include <linux/vm86.h>
#include <linux/math_emu.h>
#include <linux/ptrace.h>

#include <asm/processor.h>

#define TASK_RUNNING            0
#define TASK_INTERRUPTIBLE      1
#define TASK_UNINTERRUPTIBLE    2
#define TASK_ZOMBIE             3
#define TASK_STOPPED            4
#define TASK_SWAPPING           5

#ifndef NULL
#define NULL ((void *) 0)
#endif

#ifdef __KERNEL__

#define barrier() __asm__("": : :"memory")

extern void sched_init(void);
extern void show_state(void);
extern void trap_init(void);

asmlinkage void schedule(void);

#endif /* __KERNEL__ */

struct files_struct {
        int count;
        fd_set close_on_exec;
        struct file * fd[NR_OPEN];
};

#define INIT_FILES { \
        0, \
        { { 0, } }, \
        { NULL, } \
}

struct fs_struct {
        int count;
        unsigned short umask;
        struct inode * root, * pwd;
};

#define INIT_FS { \
        0, \
        0022, \
        NULL, NULL \
}

struct mm_struct {
        int count;
        unsigned long start_code, end_code, end_data;
        unsigned long start_brk, brk, start_stack, start_mmap;
        unsigned long arg_start, arg_end, env_start, env_end;
        unsigned long rss;
        unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
        int swappable:1;
        unsigned long swap_address;
        unsigned long old_maj_flt;      /* old value of maj_flt */
        unsigned long dec_flt;          /* page fault count of the last time */
        unsigned long swap_cnt;         /* number of pages to swap on next pass */
        struct vm_area_struct * mmap;
        struct vm_area_struct * mmap_avl;
};

#define INIT_MM { \
                0, \
                0, 0, 0, \
                0, 0, 0, 0, \
                0, 0, 0, 0, \
                0, \
/* ?_flt */     0, 0, 0, 0, \
                0, \
/* swap */      0, 0, 0, 0, \
                &init_mmap, &init_mmap }

struct task_struct {
/* these are hardcoded - don't touch */
        volatile long state;    /* -1 unrunnable, 0 runnable, >0 stopped */
        long counter;
        long priority;
        unsigned long signal;
        unsigned long blocked;  /* bitmap of masked signals */
        unsigned long flags;    /* per process flags, defined below */
        int errno;
        int debugreg[8];  /* Hardware debugging registers */
        struct exec_domain *exec_domain;
/* various fields */
        struct linux_binfmt *binfmt;
        struct task_struct *next_task, *prev_task;
        struct sigaction sigaction[32];
        unsigned long saved_kernel_stack;
        unsigned long kernel_stack_page;
        int exit_code, exit_signal;
        unsigned long personality;
        int dumpable:1;
        int did_exec:1;
        int pid,pgrp,tty_old_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;
        struct wait_queue *wait_chldexit;       /* for wait4() */
        unsigned short uid,euid,suid,fsuid;
        unsigned short gid,egid,sgid,fsgid;
        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;
        struct rlimit rlim[RLIM_NLIMITS]; 
        unsigned short used_math;
        char comm[16];
/* file system info */
        int link_count;
        struct tty_struct *tty; /* NULL if no tty */
/* ipc stuff */
        struct sem_undo *semundo;
        struct sem_queue *semsleeping;
/* ldt for this task - used by Wine.  If NULL, default_ldt is used */
        struct desc_struct *ldt;
/* tss for this task */
        struct thread_struct tss;
/* filesystem information */
        struct fs_struct fs[1];
/* open file information */
        struct files_struct files[1];
/* memory management info */
        struct mm_struct mm[1];
};

/*
 * 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_TRACESYS     0x00000020      /* tracing system calls */

#define PF_STARTING     0x00000100      /* being created */
#define PF_EXITING      0x00000200      /* getting shut down */

/*
 * cloning flags:
 */
#define CSIGNAL         0x000000ff      /* signal mask to be sent at exit */
#define COPYVM          0x00000100      /* set if VM copy desired (like normal fork()) */
#define COPYFD          0x00000200      /* set if fd's should be copied, not shared (NI) */

/*
 *  INIT_TASK is used to set up the first task table, touch at
 * your own risk!. Base=0, limit=0x1fffff (=2MB)
 */
#define INIT_TASK \
/* state etc */ { 0,15,15,0,0,0,0, \
/* debugregs */ { 0, },            \
/* exec domain */&default_exec_domain, \
/* binfmt */    NULL, \
/* schedlink */ &init_task,&init_task, \
/* signals */   {{ 0, },}, \
/* stack */     0,(unsigned long) &init_kernel_stack, \
/* ec,brk... */ 0,0,0,0,0, \
/* pid etc.. */ 0,0,0,0,0, \
/* suppl grps*/ {NOGROUP,}, \
/* proc links*/ &init_task,&init_task,NULL,NULL,NULL,NULL, \
/* uid etc */   0,0,0,0,0,0,0,0, \
/* timeout */   0,0,0,0,0,0,0,0,0,0,0,0, \
/* rlimits */   { {LONG_MAX, LONG_MAX}, {LONG_MAX, LONG_MAX},  \
                  {LONG_MAX, LONG_MAX}, {LONG_MAX, LONG_MAX},  \
                  {       0, LONG_MAX}, {LONG_MAX, LONG_MAX}, \
                  {MAX_TASKS_PER_USER, MAX_TASKS_PER_USER}, {NR_OPEN, NR_OPEN}}, \
/* math */      0, \
/* comm */      "swapper", \
/* fs info */   0,NULL, \
/* ipc */       NULL, NULL, \
/* ldt */       NULL, \
/* tss */       INIT_TSS, \
/* fs */        { INIT_FS }, \
/* files */     { INIT_FILES }, \
/* mm */        { INIT_MM } \
}

#ifdef __KERNEL__

extern struct task_struct init_task;
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 itimer_ticks;
extern unsigned long itimer_next;
extern struct timeval xtime;
extern int need_resched;

#define CURRENT_TIME (xtime.tv_sec)

extern void sleep_on(struct wait_queue ** p);
extern void interruptible_sleep_on(struct wait_queue ** p);
extern void wake_up(struct wait_queue ** p);
extern void wake_up_interruptible(struct wait_queue ** p);

extern void notify_parent(struct task_struct * tsk);
extern int send_sig(unsigned long sig,struct task_struct * p,int priv);
extern int in_group_p(gid_t grp);

extern int request_irq(unsigned int irq,void (*handler)(int, struct pt_regs *),
        unsigned long flags, const char *device);
extern void free_irq(unsigned int irq);

extern void copy_thread(int, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
extern void flush_thread(void);
extern void exit_thread(void);

extern int do_execve(char *, char **, char **, struct pt_regs *);
extern int do_fork(unsigned long, unsigned long, struct pt_regs *);
asmlinkage int do_signal(unsigned long, struct pt_regs *);

/*
 * The wait-queues are circular lists, and you have to be *very* sure
 * to keep them correct. Use only these two functions to add/remove
 * entries in the queues.
 */
extern inline void add_wait_queue(struct wait_queue ** p, struct wait_queue * wait)
{
        unsigned long flags;

#ifdef DEBUG
        if (wait->next) {
                unsigned long pc;
                __asm__ __volatile__("call 1f\n"
                        "1:\tpopl %0":"=r" (pc));
                printk("add_wait_queue (%08x): wait->next = %08x\n",pc,(unsigned long) wait->next);
        }
#endif
        save_flags(flags);
        cli();
        if (!*p) {
                wait->next = wait;
                *p = wait;
        } else {
                wait->next = (*p)->next;
                (*p)->next = wait;
        }
        restore_flags(flags);
}

extern inline void remove_wait_queue(struct wait_queue ** p, struct wait_queue * wait)
{
        unsigned long flags;
        struct wait_queue * tmp;
#ifdef DEBUG
        unsigned long ok = 0;
#endif

        save_flags(flags);
        cli();
        if ((*p == wait) &&
#ifdef DEBUG
            (ok = 1) &&
#endif
            ((*p = wait->next) == wait)) {
                *p = NULL;
        } else {
                tmp = wait;
                while (tmp->next != wait) {
                        tmp = tmp->next;
#ifdef DEBUG
                        if (tmp == *p)
                                ok = 1;
#endif
                }
                tmp->next = wait->next;
        }
        wait->next = NULL;
        restore_flags(flags);
#ifdef DEBUG
        if (!ok) {
                printk("removed wait_queue not on list.\n");
                printk("list = %08x, queue = %08x\n",(unsigned long) p, (unsigned long) wait);
                __asm__("call 1f\n1:\tpopl %0":"=r" (ok));
                printk("eip = %08x\n",ok);
        }
#endif
}

extern inline void select_wait(struct wait_queue ** wait_address, select_table * p)
{
        struct select_table_entry * entry;

        if (!p || !wait_address)
                return;
        if (p->nr >= __MAX_SELECT_TABLE_ENTRIES)
                return;
        entry = p->entry + p->nr;
        entry->wait_address = wait_address;
        entry->wait.task = current;
        entry->wait.next = NULL;
        add_wait_queue(wait_address,&entry->wait);
        p->nr++;
}

extern void __down(struct semaphore * sem);

/*
 * These are not yet interrupt-safe
 */
extern inline void down(struct semaphore * sem)
{
        if (sem->count <= 0)
                __down(sem);
        sem->count--;
}

extern inline void up(struct semaphore * sem)
{
        sem->count++;
        wake_up(&sem->wait);
}       

#define REMOVE_LINKS(p) do { unsigned long flags; \
        save_flags(flags) ; cli(); \
        (p)->next_task->prev_task = (p)->prev_task; \
        (p)->prev_task->next_task = (p)->next_task; \
        restore_flags(flags); \
        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; \
        } while (0)

#define SET_LINKS(p) do { unsigned long flags; \
        save_flags(flags); cli(); \
        (p)->next_task = &init_task; \
        (p)->prev_task = init_task.prev_task; \
        init_task.prev_task->next_task = (p); \
        init_task.prev_task = (p); \
        restore_flags(flags); \
        (p)->p_ysptr = NULL; \
        if (((p)->p_osptr = (p)->p_pptr->p_cptr) != NULL) \
                (p)->p_osptr->p_ysptr = p; \
        (p)->p_pptr->p_cptr = p; \
        } while (0)

#define for_each_task(p) \
        for (p = &init_task ; (p = p->next_task) != &init_task ; )

#endif /* __KERNEL__ */

#endif