include/linux/sched.h - pub/scm/linux/kernel/git/nico/archive - Git at Google

 #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
	#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]; /* 810 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