/*	$OpenBSD: pcb.h,v 1.4 1999/02/09 06:36:27 smurph Exp $ */
/*
 * Copyright (c) 1996 Nivas Madhur
 * Mach Operating System
 * Copyright (c) 1993-1992 Carnegie Mellon University
 * All Rights Reserved.
 *
 * Permission to use, copy, modify and distribute this software and its
 * documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 *
 * CARNEGIE MELLON AND OMRON ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS IS"
 * CONDITION.  CARNEGIE MELLON AND OMRON DISCLAIM ANY LIABILITY OF ANY KIND
 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 *
 * Carnegie Mellon requests users of this software to return to
 *
 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 *
 * any improvements or extensions that they make and grant Carnegie Mellon
 * the rights to redistribute these changes.
 */
/* 
 * Motorola 88100 pcb definitions 
 *
 */
/*
 */
#ifndef _PCB_H_
#define _PCB_H_

/* 
 * Our PCB is the regular PCB+Save area for kernel frame.
 * Upon entering kernel mode from user land, save the user context
 * in the saved_state area - this is passed as the exception frame.
 * On a context switch, only registers that need to be saved by the
 * C calling convention and few other regs (pc, psr etc) are saved
 * in the kernel_state part of the PCB. Typically, trap fames are
 * save on the stack (by low level handlers or by hardware) but,
 * we just decided to do it in the PCB.
 */

/*
 * This must always be an even number of words long so that our stack
 * will always be properly aligned (88k need 8 byte alignmet). Also,
 * place r14 on double word boundary so that we can use st.d while
 * saving the regs.
 */

struct m88100_pcb {
    unsigned pcb_pc;	/* address to return */
    unsigned pcb_ipl;
    unsigned pcb_r14;
    unsigned pcb_r15;
    unsigned pcb_r16;
    unsigned pcb_r17;
    unsigned pcb_r18;
    unsigned pcb_r19;
    unsigned pcb_r20;
    unsigned pcb_r21;
    unsigned pcb_r22;
    unsigned pcb_r23;
    unsigned pcb_r24;
    unsigned pcb_r25;
    unsigned pcb_r26;
    unsigned pcb_r27;
    unsigned pcb_r28;
    unsigned pcb_r29;
    unsigned pcb_r30;
    unsigned pcb_sp; 	/* kernel stack pointer */
};


/*
 *	m88100_saved_state	this structure corresponds to the state
 *				of the user registers as saved on the
 *				stack upon kernel entry.  This structure
 *				is used internally only.  Since this
 *				structure may change from version to
 *				version, it is hidden from the user.
 */

/* This must always be an even number of words long */

struct m88100_saved_state {
    unsigned r[32];
    unsigned fpsr;
    unsigned fpcr;
    unsigned epsr;
    unsigned sxip;
    unsigned snip;
    unsigned sfip;
    unsigned ssbr;
    unsigned dmt0;
    unsigned dmd0;
    unsigned dma0;
    unsigned dmt1;
    unsigned dmd1;
    unsigned dma1;
    unsigned dmt2;
    unsigned dmd2;
    unsigned dma2;
    unsigned fpecr;
    unsigned fphs1;
    unsigned fpls1;
    unsigned fphs2;
    unsigned fpls2;
    unsigned fppt;
    unsigned fprh;
    unsigned fprl;
    unsigned fpit;
    unsigned vector;	/* exception vector number */
    unsigned mask;	/* interrupt mask level */
    unsigned mode;	/* interrupt mode */
    unsigned scratch1;	/* used by locore trap handling code */
    unsigned ipfsr;      /* P BUS status - used in inst fault handling */
    unsigned dpfsr;      /* P BUS status - used in data fault handling */
    unsigned pad;	/* alignment */
};

#define trapframe m88100_saved_state

struct pcb
{
  struct m88100_pcb            kernel_state;
  struct m88100_saved_state    user_state;
  int	 		       pcb_onfault;	/* for copyin/copyout faults */
  int	 		       pcb_pad;		/* pad it XXX */
};

typedef	struct pcb	*pcb_t;		/* exported */

/*
 *	Location of saved user registers for the proc.
 */
#define	USER_REGS(p) \
	(((struct m88100_saved_state *)  (&((p)->p_addr->u_pcb.user_state))))
/*
 * The pcb is augmented with machine-dependent additional data for
 * core dumps.  Note that the trapframe here is a copy of the one
 * from the top of the kernel stack (included here so that the kernel
 * stack itself need not be dumped).
 */
struct md_coredump {
	struct	trapframe md_tf;
};

#endif  _PCB_H_