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      1 /*	$NetBSD: pcb.h,v 1.61 2025/04/24 09:29:09 kre Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1998, 2009 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Charles M. Hannum, and by Andrew Doran.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 /*
     33  * Copyright (c) 1990 The Regents of the University of California.
     34  * All rights reserved.
     35  *
     36  * This code is derived from software contributed to Berkeley by
     37  * William Jolitz.
     38  *
     39  * Redistribution and use in source and binary forms, with or without
     40  * modification, are permitted provided that the following conditions
     41  * are met:
     42  * 1. Redistributions of source code must retain the above copyright
     43  *    notice, this list of conditions and the following disclaimer.
     44  * 2. Redistributions in binary form must reproduce the above copyright
     45  *    notice, this list of conditions and the following disclaimer in the
     46  *    documentation and/or other materials provided with the distribution.
     47  * 3. Neither the name of the University nor the names of its contributors
     48  *    may be used to endorse or promote products derived from this software
     49  *    without specific prior written permission.
     50  *
     51  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     52  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     53  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     54  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     55  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     56  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     57  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     58  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     59  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     60  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     61  * SUCH DAMAGE.
     62  *
     63  *	@(#)pcb.h	5.10 (Berkeley) 5/12/91
     64  */
     65 
     66 /*
     67  * Intel 386 process control block
     68  */
     69 
     70 #ifndef _I386_PCB_H_
     71 #define _I386_PCB_H_
     72 
     73 #if defined(_KERNEL_OPT)
     74 #include "opt_multiprocessor.h"
     75 #endif
     76 
     77 #include <machine/segments.h>
     78 #include <x86/cpu_extended_state.h>
     79 
     80 struct pcb {
     81 	int	pcb_esp0;		/* ring0 esp */
     82 	int	pcb_esp;		/* kernel esp */
     83 	int	pcb_ebp;		/* kernel ebp */
     84 	int	pcb_cr0;		/* saved image of CR0 */
     85 	int	pcb_cr2;		/* page fault address (CR2) */
     86 	int	pcb_cr3;		/* page directory pointer */
     87 	int	pcb_iopl;		/* i/o privilege level */
     88 
     89 	struct segment_descriptor pcb_fsd;	/* %fs descriptor */
     90 	struct segment_descriptor pcb_gsd; 	/* %gs descriptor */
     91 	void 	*pcb_onfault;		/* copyin/out fault recovery */
     92 	char	*pcb_iomap;		/* I/O permission bitmap */
     93 	struct dbreg	*pcb_dbregs;	/* CPU Debug Registers */
     94 	uint16_t pcb_fpu_dflt_cw;
     95 
     96 #define	PCB_DBREGS	0x01
     97 	int	pcb_flags;
     98 
     99 	int	not_used[15];
    100 
    101 	/* floating point state */
    102 	union savefpu	pcb_savefpu[1] __aligned(64);
    103 #define	pcb_savefpusmall	pcb_savefpu
    104 	/* **** DO NOT ADD ANYTHING HERE **** */
    105 
    106 };
    107 #ifndef __lint__
    108 #include <sys/stddef.h>		/* for offsetof() */
    109 
    110 /* This doesn't really matter, but there is a lot of implied padding */
    111 __CTASSERT(offsetof(struct pcb, pcb_savefpu) == 128);
    112 __CTASSERT(sizeof(struct pcb) - sizeof (union savefpu) == 128);
    113 #endif
    114 
    115 #endif /* _I386_PCB_H_ */
    116