/***********************************************************************
 * file:    h/sys/Pspace.h
 * part#:
 * internal sequence#:
 *
 *	**************************************************************
 *	*     " c Copyright Hewlett-Packard Company, 1984.*  All     *
 *	*    rights are reserved.  Copying or other reproduction     *
 *	*    of this program except for archival purposes is         *
 *	*    prohibited without the prior written consent of         *
 *	*    Hewlett-Packard Company."				     *
 *	**************************************************************
 *
 *	This header file defines the Pisces specific memory map
 *	The map is as follows:
 *	
 *	RAMTOP
 *	INFINITY	RAMTOP_P	+---------------------------+
 *					| pseudo-vectors & MACSbug  |
 *	  		P0SSTKT_P	+---------------------------+
 *					| proc[0] sys stack         |
 *	MAXSTACK	P0SSTKB_P	|     /... proc[0] u area   |
 *	SSTKT_P		P0UAREA_P	+---------------------------+
 *					| active system stack       |
 *					|     /... active u area    |
 *	SSTKB_P		&u		+---------------------------+
 *	URAMTOP ---->
 *					|			    |
 *
 * above are kernel PHYSICAL ADDRESSES
 * --------------------------
 * below are user LOGICAL ADDRESSES
 *					|			    |
 *					+---------------------------+
 *	USRST_P		INITST		|   User text, data, & bss  |
 *	USRST		USRSTART	+---------------------------+
 *			USSTKT_P	| user sys stack            |
 *	UUAREA_P			|    /... user u_area	    |
 *	USTKT_P		USSTKB_P	+---------------------------+
 *					| user stack                |
 *	USTKB_P		UIMST_P		+---------------------------+
 *					|
 *
 *		Pisces Q-DOS project
 *		Andy Rood  Kernel project lead
 *		-----------------------------------------------------
 *		initial					3/4/83	alr
 *		change to 840000 - 880000 user area     3/8/83  alr
 *		move sys per proc stack back into
 *			u_area ==> new picture		8/22/83 alr
 *		new map for mlp machines		9/26/83 alr
 *		change to 0x2000 based user		1/5/84  alr
 *		add ifdef ROM to URAMTOP for
 *		  differentiating btwn ROM based and
 *		  ram based OS's			4/11/84 jra
 *		reserved space for jump table, 
 *		  coalesced stack space			6/17/84 jra
 */

#if ROM || RAMROM
/*
 * rom based system, set the top of memory to just
 * below the data segment of the kernel
 */
#define URAMTOP		0xf08000	/* top of user physical RAM */
#else
/*
 * ram based system, the top of user memory is set to 
 * below the kernel text segment
 */
#define URAMTOP		0xed4000	/* top of user physical RAM */
#endif
#define RAMTOP_P	0xF20000	/* top of physical RAM      */
					/*   see also: mch.s        */
#define RAMTOP		RAMTOP_P	/*	-old alias-	    */
#define P0SSTKT_P	0xf1df00	/* top of proc[0] sys stack */
					/*   see also: end.s        */
					/*   see also: mch.s        */
#define P0SSTKB_P	0xf1d700	/* bottom of proc[0] sysstk */
					/*   see also: mch.s        */
#define P0UAREA_P	0xf1d700	/* proc[0] u_area           */
#define SSTKT_P		0xf1d700	/* top of system stack      */
					/*   see also: mch.s        */
#define SSTKB_P		0xf1cf00	/* bottom of system stack   */

/* above are kernel PHYSICAL ADDRESSES                      */
/************************************************************/
/* below are user LOGICAL ADDRESSES			    */

#define USRST_P		0x2000  	/* start of user text image */
					/*  see also: mch.s         */
#define UUAREA_P	0x1800  	/* start of user u_area     */
#define USSTKT_P	0x2000  	/* top of user sys stack    */
					/*  see also: icode.s       */
#define USSTKB_P	0x1800  	/* bottom os user sys stack */
#define USTKT_P		0x1800  	/* top of user stack        */
/*
 * #define USTKB_P		0x1000  	/* bottom of user stack    
 *
 * #define UIMST_P		0x1000  	/* start of user proc image
 */
#define USTKB_P		u.u_procp->p_t1
#define UIMST_P		u.u_procp->p_t1

/*
 * define the PISCES mlp memory mapper registers
 * (i.e. root them in memory)
 *
 * these are 12 bit registers which should be written to as shorts
 * (16 bits)
 */
#define P_UDADD	0x600000
#define P_UIADD	0x600002

/*
 * per process fized overhead for u_area and user and sys stacks
 */
#define EXOVHD 4