pdp10_defs.h

/* pdp10_defs.h: PDP-10 simulator definitions

   Copyright (c) 1993-2001, Robert M Supnik

   Permission is hereby granted, free of charge, to any person obtaining a
   copy of this software and associated documentation files (the "Software"),
   to deal in the Software without restriction, including without limitation
   the rights to use, copy, modify, merge, publish, distribute, sublicense,
   and/or sell copies of the Software, and to permit persons to whom the
   Software is furnished to do so, subject to the following conditions:

   The above copyright notice and this permission notice shall be included in
   all copies or substantial portions of the Software.

   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
   ROBERT M SUPNIK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
   IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

   Except as contained in this notice, the name of Robert M Supnik shall not
   be used in advertising or otherwise to promote the sale, use or other dealings
   in this Software without prior written authorization from Robert M Supnik.

   23-Oct-01	RMS	New IO page address constants
   19-Oct-01	RMS	Added DZ definitions
   07-Sep-01	RMS	Revised for PDP-11 multi-level interrupts
   31-Aug-01	RMS	Changed int64 to t_int64 for Windoze
   29-Aug-01	RMS	Corrected models and dates (found by Lars Brinkhoff)
   01-Jun-01	RMS	Updated DZ11 vector definitions
   19-May-01	RMS	Added workaround for TOPS-20 V4.1 boot bug
*/

#include "sim_defs.h"					/* simulator defns */

/* Digital Equipment Corporation's 36b family had six implementations:

   name		mips	comments

   PDP-6	0.25	Original 36b implementation, 1964
   KA10		0.38	First PDP-10, flip chips, 1967
   KI10		0.72	First paging system, flip chip + MSI, 1972
   KL10		1.8	First ECL system, ECL 10K, 1975
   KL10B	1.8	Expanded addressing, ECL 10K, 1978
   KS10		0.3	Last 36b system, 2901 based, 1979

   In addition, it ran four major (incompatible) operating systems:

   name		company	comments

   TOPS-10	DEC	Original timesharing system
   ITS		MIT	"Incompatible Timesharing System"
   TENEX	BBN	ARPA-sponsored, became
   TOPS-20	DEC	Commercial version of TENEX

   All of the implementations differ from one another, in instruction set,
   I/O structure, and memory management.  Further, each of the operating
   systems customized the microcode of the paging systems (KI10, KL10, KS10)
   for additional instructions and specialized memory management.  As a
   result, there is no "reference implementation" for the 36b family that
   will run all programs and all operating systems.  The conditionalization
   and generality needed to support the full matrix of models and operating
   systems, and to support 36b hardware on 32b data types, is beyond the
   scope of this project.

   Instead, this simulator emulates one model -- the KS10.  It has the best
   documentation and allows reuse of some of the Unibus peripheral emulators
   written for the PDP-11 simulator.  Further, the simulator requires that
   the underlying compiler support 64b integer data types, allowing 36b data
   to be maintained in a single data item.  Lastly, the simulator implements
   the maximum memory size, so that NXM's never happen.
*/

/* Data types */

typedef int32		a10;				/* PDP-10 addr (30b) */
typedef t_int64		d10;				/* PDP-10 data (36b) */

/* Abort codes, used to sort out longjmp's back to the main loop
   Codes > 0 are simulator stop codes
   Codes < 0 are internal aborts
   Code  = 0 stops execution for an interrupt check
*/

#define STOP_HALT	1				/* halted */
#define STOP_IBKPT	2				/* breakpoint */
#define STOP_ILLEG	3				/* illegal instr */
#define STOP_ILLINT	4				/* illegal intr inst */
#define STOP_PAGINT	5				/* page fail in intr */
#define STOP_ZERINT	6				/* zero vec in intr */
#define STOP_NXMPHY	7				/* nxm on phys ref */
#define STOP_IND	8				/* indirection loop */
#define STOP_XCT	9				/* XCT loop */
#define STOP_ILLIOC	10				/* invalid UBA num */
#define STOP_MTRLNT	11				/* invalid mt rec lnt */
#define STOP_ASTOP	12				/* address stop */
#define STOP_UNKNOWN	13				/* unknown stop  */
#define PAGE_FAIL	-1				/* page fail */
#define INTERRUPT	-2				/* interrupt */
#define ABORT(x)	longjmp (save_env, (x))		/* abort */
#define IORETURN(f,v)	((f)? (v): SCPE_OK)		/* cond error return */

/* Return codes from eXTEND */

#define XT_MUUO		0				/* invalid operation */
#define XT_SKIP		1				/* skip return */
#define XT_NOSK		2				/* no skip return */

/* Operating system flags, kept in cpu_unit.flags */

#define UNIT_V_ITS	(UNIT_V_UF)			/* ITS */
#define UNIT_ITS	(1 << UNIT_V_ITS)
#define UNIT_V_T20V41	(UNIT_V_UF + 1)			/* TOPS-20 V4.1 */
#define UNIT_T20V41	(1 << UNIT_V_T20V41)
#define ITS		(cpu_unit.flags & UNIT_ITS)

/* Architectural constants */

#define PASIZE		20				/* phys addr width */
#define MAXMEMSIZE	(1 << PASIZE)			/* maximum memory */
#define PAMASK		((1 << PASIZE) - 1)
#define MEMSIZE		MAXMEMSIZE			/* fixed, KISS */
#define MEM_ADDR_NXM(x)	((x) >= MEMSIZE)
#define VASIZE		18				/* virtual addr width */
#define AMASK		((1 << VASIZE) - 1)		/* virtual addr mask */
#define LMASK		0777777000000			/* left mask */
#define LSIGN		0400000000000			/* left sign */
#define RMASK		0000000777777			/* right mask */
#define RSIGN		0000000400000			/* right sign */
#define DMASK		0777777777777			/* data mask */
#define SIGN		0400000000000			/* sign */
#define MMASK		0377777777777			/* magnitude mask */
#define ONES		0777777777777
#define MAXPOS		0377777777777
#define MAXNEG		0400000000000

/* Instruction format */

#define INST_V_OP	27				/* opcode */
#define INST_M_OP	0777
#define INST_V_DEV	26
#define INST_M_DEV	0177				/* device */
#define INST_V_AC	23				/* AC */
#define INST_M_AC	017
#define INST_V_IND	22				/* indirect */
#define INST_IND	(1 << INST_V_IND)
#define INST_V_XR	18				/* index */
#define INST_M_XR	017
#define OP_JRST		0254				/* JRST */
#define AC_XPCW		07				/* XPCW */
#define OP_JSR		0264				/* JSR */
#define GET_OP(x)	((int32) (((x) >> INST_V_OP) & INST_M_OP))
#define GET_DEV(x)	((int32) (((x) >> INST_V_DEV) & INST_M_DEV))
#define GET_AC(x)	((int32) (((x) >> INST_V_AC) & INST_M_AC))
#define TST_IND(x)	((x) & INST_IND)
#define GET_XR(x)	((int32) (((x) >> INST_V_XR) & INST_M_XR))
#define GET_ADDR(x)	((a10) ((x) & AMASK))

/* Byte pointer format */

#define BP_V_P		30				/* position */
#define BP_M_P		077
#define BP_P		0770000000000
#define BP_V_S		24				/* size */
#define BP_M_S		077
#define BP_S		0007700000000
#define GET_P(x)	((int32) (((x) >> BP_V_P) & BP_M_P))
#define GET_S(x)	((int32) (((x) >> BP_V_S) & BP_M_S))
#define PUT_P(b,x)	(((b) & ~BP_P) | ((((t_int64) (x)) & BP_M_P) << BP_V_P))

/* Flags (stored in their own halfword) */

#define F_V_AOV		17				/* arithmetic ovflo */
#define F_V_C0		16				/* carry 0 */
#define F_V_C1		15				/* carry 1 */
#define F_V_FOV		14				/* floating ovflo */
#define F_V_FPD		13				/* first part done */
#define F_V_USR		12				/* user mode */
#define F_V_UIO		11				/* user I/O mode */
#define F_V_PUB		10				/* public mode */
#define F_V_AFI		9				/* addr fail inhibit */
#define F_V_T2		8				/* trap 2 */
#define F_V_T1		7				/* trap 1 */
#define F_V_FXU		6				/* floating exp unflo */
#define F_V_DCK		5				/* divide check */
#define F_AOV		(1 << F_V_AOV)
#define F_C0		(1 << F_V_C0)
#define F_C1		(1 << F_V_C1)
#define F_FOV		(1 << F_V_FOV)
#define F_FPD		(1 << F_V_FPD)
#define F_USR		(1 << F_V_USR)
#define F_UIO		(1 << F_V_UIO)
#define F_PUB		(1 << F_V_PUB)
#define F_AFI		(1 << F_V_AFI)
#define F_T2		(1 << F_V_T2)
#define F_T1		(1 << F_V_T1)
#define F_TR		(F_T1 | F_T2)
#define F_FXU		(1 << F_V_FXU)
#define F_DCK		(1 << F_V_DCK)
#define F_1PR		(F_AFI)				/* ITS: 1-proceed */
#define F_MASK		0777740				/* all flags */
#define SETF(x)		flags = flags | (x)
#define CLRF(x)		flags = flags & ~(x)
#define TSTF(x)		(flags & (x))
#define GET_TRAPS(x)	(((x) & (F_T2 | F_T1)) >> F_V_T1)

/* Priority interrupt system */

#define PI_CPRQ		020000				/* drop prog req */
#define PI_INIT		010000				/* clear pi system */
#define PI_SPRQ		004000				/* set prog req */
#define PI_SENB		002000				/* set enables */
#define PI_CENB		001000				/* clear enables */
#define PI_CON		000400				/* turn off pi system */
#define PI_SON		000200				/* turn on pi system */
#define PI_M_LVL	000177				/* level mask */
#define PI_V_PRQ	18				/* in CONI */
#define PI_V_ACT	8
#define PI_V_ON		7
#define PI_V_ENB	0

/* Arithmetic processor flags */

#define APR_SENB	0100000				/* set enable */
#define APR_CENB	0040000				/* clear enable */
#define APR_CFLG	0020000				/* clear flag */
#define APR_SFLG	0010000				/* set flag */
#define APR_IRQ		0000010				/* int request */
#define APR_M_LVL	0000007				/* pi level */
#define APR_V_FLG	4				/* system flags */
#define APR_M_FLG	0377
#define APRF_ITC	(002000 >> APR_V_FLG)		/* int console flag */
#define APRF_NXM	(000400 >> APR_V_FLG)		/* nxm flag */
#define APRF_TIM	(000040 >> APR_V_FLG)		/* timer request */
#define APRF_CON	(000020 >> APR_V_FLG)		/* console int */
#define APR_GETF(x)	(((x) >> APR_V_FLG) & APR_M_FLG)

/* Virtual address, DEC paging */

#define PAG_V_OFF	0				/* offset - must be 0 */
#define PAG_N_OFF	9				/* page offset width  */
#define PAG_SIZE	01000				/* page offset size */
#define PAG_M_OFF	0777				/* mask for offset */
#define PAG_V_PN	PAG_N_OFF			/* page number */
#define PAG_N_PPN	(PASIZE - PAG_N_OFF)		/* phys pageno width */
#define PAG_M_PPN	03777				/* phys pageno mask */
#define PAG_PPN		03777000
#define PAG_N_VPN	(VASIZE - PAG_N_OFF)		/* virt pageno width */
#define PAG_M_VPN	0777				/* virt pageno mask */
#define PAG_VPN		0777000
#define PAG_GETOFF(x)	((x) & PAG_M_OFF)
#define PAG_GETVPN(x)	(((x) >> PAG_V_PN) & PAG_M_VPN)
#define PAG_XPTEPA(p,x)	(((p) + PAG_GETOFF (x)) & PAMASK)
#define PAG_PTEPA(p,x)	(((((int32) (p)) & PTE_PPMASK) << PAG_V_PN) + PAG_GETOFF (x))

/* Page table entry, TOPS-10 paging */

#define PTE_T10_A	0400000				/* T10: access */
#define PTE_T10_P	0200000				/* T10: public */
#define PTE_T10_W	0100000				/* T10: writeable */
#define PTE_T10_S	0040000				/* T10: software */
#define PTE_T10_C	0020000				/* T10: cacheable */
#define PTE_PPMASK	PAG_M_PPN

/* Page table entry, TOPS-20 paging */

#define PTE_T20_V_TYP	33				/* T20: pointer type */
#define PTE_T20_M_TYP	07
#define  T20_NOA	 0				/* no access */
#define  T20_IMM	 1				/* immediate */
#define  T20_SHR	 2				/* shared */
#define  T20_IND	 3				/* indirect */
#define PTE_T20_W	0020000000000			/* T20: writeable */
#define PTE_T20_C	0004000000000			/* T20: cacheable */
#define PTE_T20_STM	0000077000000			/* T20: storage medium */
#define PTE_T20_V_PMI	18				/* page map index */
#define PTE_T20_M_PMI	0777
#define T20_GETTYP(x)	((int32) (((x) >> PTE_T20_V_TYP) & PTE_T20_M_TYP))
#define T20_GETPMI(x)	((int32) (((x) >> PTE_T20_V_PMI) & PTE_T20_M_PMI))

/* CST entry, TOPS-20 paging */

#define CST_AGE		0770000000000			/* age field */
#define CST_M		0000000000001			/* modified */

/* Page fail word, DEC paging */

#define PF_USER		0400000000000			/* user mode */
#define PF_HARD		0200000000000			/* nx I/O reg */
#define PF_NXM		0370000000000			/* nx memory */
#define PF_T10_A	0100000000000			/* T10: pte A bit */
#define PF_T10_W	0040000000000			/* T10: pte W bit */
#define PF_T10_S	0020000000000			/* T10: pte S bit */
#define PF_T20_DN	0100000000000			/* T20: eval done */
#define PF_T20_M	0040000000000			/* T20: modified */
#define PF_T20_W	0020000000000			/* T20: writeable */
#define PF_WRITE	0010000000000			/* write reference */
#define PF_PUB		0004000000000			/* pte public bit */
#define PF_C		0002000000000			/* pte C bit */
#define PF_VIRT		0001000000000			/* pfl: virt ref */
#define PF_NXMP		0001000000000			/* nxm: phys ref */
#define PF_IO		0000200000000			/* I/O reference */
#define PF_BYTE		0000020000000			/* I/O byte ref */

/* Virtual address, ITS paging */

#define ITS_V_OFF	0				/* offset - must be 0 */
#define ITS_N_OFF	10				/* page offset width */
#define ITS_SIZE	02000				/* page offset size */
#define ITS_M_OFF	01777				/* mask for offset */
#define ITS_V_PN	ITS_N_OFF			/* page number */
#define ITS_N_PPN	(PASIZE- ITS_N_OFF)		/* phys pageno width */
#define ITS_M_PPN	01777				/* phys pageno mask */
#define ITS_PPN		03776000
#define ITS_N_VPN	(VASIZE - ITS_N_OFF)		/* virt pageno width */
#define ITS_M_VPN	0377				/* virt pageno mask */
#define ITS_VPN		0776000
#define ITS_GETVPN(x)	(((x) >> ITS_V_PN) & ITS_M_VPN)

/* Page table entry, ITS paging */

#define PTE_ITS_V_ACC	16				/* access field */
#define PTE_ITS_M_ACC	03
#define  ITS_ACC_NO	 0				/* no access */
#define  ITS_ACC_RO	 1				/* read only */
#define  ITS_ACC_RWF	 2				/* read-write first */
#define  ITS_ACC_RW	 3				/* read write */
#define PTE_ITS_AGE	0020000				/* age */
#define PTE_ITS_C	0010000				/* cacheable */
#define PTE_ITS_PPMASK	ITS_M_PPN
#define ITS_GETACC(x)	(((x) >> PTE_ITS_V_ACC) & PTE_ITS_M_ACC)

/* Page fail word, ITS paging */

#define PF_ITS_WRITE	0010000000000			/* write reference */
#define PF_ITS_V_ACC	28				/* access from PTE */

/* Page table fill operations */

#define PTF_RD		0				/* read check */
#define PTF_WR		1				/* write check */
#define PTF_MAP		2				/* map instruction */
#define PTF_CON		4				/* console access */

/* User base register */

#define UBR_SETACB	0400000000000			/* set AC blocks */
#define UBR_SETUBR	0100000000000			/* set UBR */
#define UBR_V_CURAC	27				/* current AC block */
#define UBR_V_PRVAC	24				/* previous AC block */
#define UBR_M_AC	07
#define UBR_ACBMASK	0007700000000
#define UBR_V_UBR	0				/* user base register */
#define UBR_N_UBR	11
#define UBR_M_UBR	03777
#define UBR_UBRMASK	0000000003777
#define UBR_GETCURAC(x)	((int32) (((x) >> UBR_V_CURAC) & UBR_M_AC))
#define UBR_GETPRVAC(x)	((int32) (((x) >> UBR_V_PRVAC) & UBR_M_AC))
#define UBR_GETUBR(x)	((int32) (((x) >> UBR_V_UBR) & PAG_M_PPN))
#define UBRWORD		(ubr | UBR_SETACB | UBR_SETUBR)

/* Executive base register */

#define EBR_V_T20P	14				/* TOPS20 paging */
#define EBR_T20P	(1u << EBR_V_T20P)
#define EBR_V_PGON	13				/* enable paging */
#define EBR_PGON	(1u << EBR_V_PGON)
#define EBR_V_EBR	0				/* exec base register */
#define EBR_N_EBR	11
#define EBR_M_EBR	03777
#define EBR_MASK	(EBR_T20P | EBR_PGON | (EBR_M_EBR << EBR_V_EBR))
#define EBR_GETEBR(x)	((int32) (((x) >> EBR_V_EBR) & PAG_M_PPN))
#define PAGING		(ebr & EBR_PGON)
#define T20		(ebr & EBR_T20P)

/* AC and mapping contexts

   There are only two real contexts for selecting the AC block and
   the memory map: current and previous.  However, PXCT allows the
   choice of current versus previous to be made selectively for
   various parts of an instruction.  The PXCT flags (and the trap
   in progress flag) are kept in a dynamic CPU variable.
*/

#define TRAP_CYCLE	040				/* trap in progress */
#define EA_PXCT		010				/* eff addr calc */
#define OPND_PXCT	004				/* operand, bdst */
#define EABP_PXCT	002				/* bp eff addr calc */
#define BSTK_PXCT	001				/* stk, bp op, bsrc */
#define XSRC_PXCT	002				/* extend source */
#define XDST_PXCT	001				/* extend destination */
#define MM_CUR		000				/* current context */
#define MM_EA		(pflgs & EA_PXCT)
#define MM_OPND		(pflgs & OPND_PXCT)
#define MM_EABP		(pflgs & EABP_PXCT)
#define MM_BSTK		(pflgs & BSTK_PXCT)

/* Accumulator access.  The AC blocks are kept in array acs[AC_NBLK * AC_NUM].
   Two pointers are provided to the bases of the current and previous blocks.
   Macro AC selects the current AC block; macro XR selects current or previous,
   depending on whether the selected bit in the "pxct in progress" flag is set.
*/

#define AC_NUM		16				/* # AC's/block */
#define AC_NBLK		8				/* # AC blocks */
#define AC(r)		(ac_cur[r])			/* AC select current */
#define XR(r,prv)	((prv)? ac_prv[r]: ac_cur[r])	/* AC select context */
#define ADDAC(x,i)	(((x) + (i)) & INST_M_AC)
#define P1		ADDAC (ac, 1)

/* User process table entries */

#define UPT_T10_UMAP	0000				/* T10: user map */
#define UPT_T10_X340	0400				/* T10: exec 340-377 */
#define UPT_TRBASE	0420				/* trap base */
#define UPT_MUUO	0424				/* MUUO block */
#define UPT_MUPC	0425				/* caller's PC */
#define UPT_T10_CTX	0426				/* T10: context */
#define UPT_T20_UEA	0426				/* T20: address */
#define UPT_T20_CTX	0427				/* T20: context */
#define UPT_ENPC	0430				/* MUUO new PC, exec */
#define UPT_UNPC	0434				/* MUUO new PC, user */
#define UPT_NPCT	1				/* PC offset if trap */
#define UPT_T10_PAG	0500				/* T10: page fail blk */
#define UPT_T20_PFL	0500				/* T20: page fail wd */
#define UPT_T20_OFL	0501				/* T20: flags */
#define UPT_T20_OPC	0502				/* T20: old PC */
#define UPT_T20_NPC	0503				/* T20: new PC */
#define UPT_T20_SCTN	0540				/* T20: section 0 ptr */

/* Exec process table entries */

#define EPT_PIIT	0040				/* PI interrupt table */
#define EPT_UBIT	0100				/* Unibus intr table */
#define EPT_T10_X400	0200				/* T10: exec 400-777 */
#define EPT_TRBASE	0420				/* trap base */
#define EPT_ITS_PAG	0440				/* ITS: page fail blk */
#define EPT_T20_SCTN	0540				/* T20: section 0 ptr */
#define EPT_T10_X000	0600				/* T10: exec 0 - 337 */

/* Microcode constants */

#define UC_INHCST	0400000000000			/* inhibit CST update */
#define UC_UBABLT	0040000000000			/* BLTBU and BLTUB */
#define UC_KIPAGE	0020000000000			/* "KI" paging */
#define UC_KLPAGE	0010000000000			/* "KL" paging */
#define UC_VERDEC	(0130 << 18)			/* ucode version */
#define UC_VERITS	(262u << 18)
#define UC_SERDEC	4097				/* serial number */
#define UC_SERITS	1729
#define UC_AIDDEC	(UC_INHCST | UC_UBABLT | UC_KIPAGE | UC_KLPAGE | \
				UC_VERDEC | UC_SERDEC)
#define UC_AIDITS	(UC_KIPAGE | UC_VERITS | UC_SERITS)
#define UC_HSBDEC	0376000				/* DEC initial HSB */
#define UC_HSBITS	0000500				/* ITS initial HSB */

/* Front end communications region */

#define FE_SWITCH	030				/* halt switch */
#define FE_KEEPA	031				/* keep alive */
#define FE_CTYIN	032				/* console in */
#define FE_CTYOUT	033				/* console out */
#define FE_KLININ	034				/* KLINIK in */
#define FE_KLINOUT	035				/* KLINIK out */
#define FE_RHBASE	036				/* boot: RH11 addr */
#define FE_UNIT		037				/* boot: unit num */
#define FE_MTFMT	040				/* boot: magtape params */
#define FE_CVALID	0400				/* char valid flag */

/* Halfword operations */

#define ADDL(x,y)	(((x) + ((y) << 18)) & LMASK)
#define ADDR(x,y)	(((x) + (y)) & RMASK)
#define INCL(x)		ADDL (x, 1)
#define INCR(x)		ADDR (x, 1)
#define AOB(x)		(INCL (x) | INCR(x))
#define SUBL(x,y)	(((x) - ((y) << 18)) & LMASK)
#define SUBR(x,y)	(((x) - (y)) & RMASK)
#define DECL(x)		SUBL (x, 1)
#define DECR(x)		SUBR (x, 1)
#define SOB(x)		(DECL (x) | DECR(x))
#define LLZ(x)		((x) & LMASK)
#define RLZ(x)		(((x) << 18) & LMASK)
#define RRZ(x)		((x) & RMASK)
#define LRZ(x)		(((x) >> 18) & RMASK)
#define LIT8(x)		(((x) & RSIGN)? \
			 (((x) & 0377)? (-(x) & 0377): 0400): ((x) & 0377))

/* Fullword operations */

#define INC(x)		(((x) + 1) & DMASK)
#define DEC(x)		(((x) - 1) & DMASK)
#define SWP(x)		((((x) << 18) & LMASK) | (((x) >> 18) & RMASK))
#define XWD(x,y)	(((((d10) (x)) << 18) & LMASK) | (((d10) (y)) & RMASK))
#define SETS(x)		((x) | SIGN)
#define CLRS(x)		((x) & ~SIGN)
#define TSTS(x)		((x) & SIGN)
#define NEG(x)		(-(x) & DMASK)
#define ABS(x)		(TSTS (x)? NEG(x): (x))
#define SXT(x)		(TSTS (x)? (x) | ~DMASK: (x))

/* Doubleword operations (on 2-word arrays) */

#define DMOVN(rs)	rs[1] = (-rs[1]) & MMASK; \
			rs[0] = (~rs[0] + (rs[1] == 0)) & DMASK
#define MKDNEG(rs)	rs[1] = SETS (-rs[1]) & DMASK; \
			rs[0] = (~rs[0] + (rs[1] == MAXNEG)) & DMASK
#define DCMPGE(a,b)	((a[0] > b[0]) || ((a[0] == b[0]) && (a[1] >= b[1])))

/* Address operations */

#define ADDA(x,i)	(((x) + (i)) & AMASK)
#define INCA(x)		ADDA (x, 1)

/* Unibus adapter control/status register */

#define UBCS_TMO	0400000				/* timeout */
#define UBCS_BMD	0200000				/* bad mem data NI */
#define UBCS_PAR	0100000				/* parity error NI */
#define UBCS_NXD	0040000				/* nx device */
#define UBCS_HI		0004000				/* irq on BR7 or BR6 */
#define UBCS_LO		0002000				/* irq on BR5 or BR4 */
#define UBCS_PWR	0001000				/* power low NI */
#define UBCS_DXF	0000200				/* disable xfer NI*/
#define UBCS_INI	0000100				/* Unibus init */
#define UBCS_RDZ	0030500				/* read as zero */
#define UBCS_RDW	0000277				/* read/write bits */
#define UBCS_V_LHI	3				/* hi pri irq level */
#define UBCS_V_LLO	0				/* lo pri irq level */
#define UBCS_M_PRI	07
#define UBCS_GET_HI(x)	(((x) >> UBCS_V_LHI) & UBCS_M_PRI)
#define UBCS_GET_LO(x)	(((x) >> UBCS_V_LLO) & UBCS_M_PRI)

/* Unibus adapter page map */

#define UBANUM		2				/* # of Unibus adapters */
#define UMAP_ASIZE	6				/* address size */
#define UMAP_MEMSIZE	(1 << UMAP_ASIZE)		/* length */
#define UMAP_AMASK	(UMAP_MEMSIZE - 1)
#define UMAP_V_RRV	30				/* read reverse  */
#define UMAP_V_DSB	29				/* 16b on NPR read */
#define UMAP_V_FST	28				/* fast transfer */
#define UMAP_V_VLD	27				/* valid flag  */
#define UMAP_RRV	(1 << UMAP_V_RRV)
#define UMAP_DSB	(1 << UMAP_V_DSB)
#define UMAP_FST	(1 << UMAP_V_FST)
#define UMAP_VLD	(1 << UMAP_V_VLD)
#define UMAP_V_FLWR	14				/* flags as written */
#define UMAP_V_FLRD	27				/* flags as stored */
#define UMAP_M_FL	017
#define UMAP_V_PNWR	0				/* page num, write */
#define UMAP_V_PNRD	9				/* page num, read */
#define UMAP_M_PN	03777
#define UMAP_MASK	((UMAP_M_FL << UMAP_V_FLRD) | (UMAP_M_PN << UMAP_V_PNRD))
#define UMAP_POSFL(x)	(((x) & (UMAP_M_FL << UMAP_V_FLWR)) \
			 << (UMAP_V_FLRD - UMAP_V_FLWR))
#define UMAP_POSPN(x)	(((x) & (UMAP_M_PN << UMAP_V_PNWR)) \
			 << (UMAP_V_PNRD - UMAP_V_PNWR))

/* Unibus I/O constants */

#define READ		0				/* PDP11 compatible */
/* #define READC	1				/* console read */
#define WRITE		2
/* #define WRITEC	3				/* console write */
#define WRITEB		4
#define IO_V_UBA	18				/* UBA in I/O addr */
#define IO_N_UBA	16				/* max num of UBA's */
#define IO_M_UBA	(IO_N_UBA - 1)
#define IO_UBA1		(1 << IO_V_UBA)
#define IO_UBA3		(3 << IO_V_UBA)
#define GET_IOUBA(x)	(((x) >> IO_V_UBA) & IO_M_UBA)

/* DZ11 parameters */

#define DZ_MUXES	1				/* # of muxes */
#define DZ_LINES	8				/* lines per mux */

/* I/O page layout */

#define IOBA_DZ		0760010				/* DZ11 */
#define IOLN_DZ		(010 * DZ_MUXES)
#define IOBA_TCU	0760770				/* TCU150 */
#define IOLN_TCU	006
#define IOBA_UBMAP	0763000				/* Unibus map */
#define IOLN_UBMAP	0100
#define IOBA_UBCS	0763100				/* Unibus c/s reg */
#define IOLN_UBCS	001
#define IOBA_UBMNT	0763101				/* Unibus maint reg */
#define IOLN_UBMNT	001
#define IOBA_TU		0772440				/* RH11/tape */
#define IOLN_TU		034
#define IOBA_RP		0776700				/* RH11/disk */
#define IOLN_RP		050
#define IOBA_LP20	0775400				/* LP20 */
#define IOLN_LP20	020
#define IOBA_PT		0777550				/* PC11 */
#define IOLN_PT		010

/* Common Unibus CSR flags */

#define CSR_V_GO	0				/* go */
#define CSR_V_IE	6				/* interrupt enable */
#define CSR_V_DONE	7				/* done */
#define CSR_V_BUSY	11				/* busy */
#define CSR_V_ERR	15				/* error */
#define CSR_GO		(1u << CSR_V_GO)
#define CSR_IE		(1u << CSR_V_IE)
#define CSR_DONE	(1u << CSR_V_DONE)
#define CSR_BUSY	(1u << CSR_V_BUSY)
#define CSR_ERR		(1u << CSR_V_ERR)

/* I/O system definitions, lifted from the PDP-11 simulator
   Interrupt assignments, priority is right to left

   <3:0> =	BR7
   <7:4> =	BR6
   <19:8> =	BR5
   <30:20> =	BR4
*/

#define INT_V_RP	6				/* RH11/RP,RM drives */
#define INT_V_TU	7				/* RH11/TM03/TU45 */
#define INT_V_DZRX	16				/* DZ11 */
#define INT_V_DZTX	17
#define INT_V_PTR	24				/* PC11 */
#define INT_V_PTP	25
#define INT_V_LP20	26				/* LPT20 */

#define INT_RP		(1u << INT_V_RP)
#define INT_TU		(1u << INT_V_TU)
#define INT_DZRX	(1u << INT_V_DZRX)
#define INT_DZTX	(1u << INT_V_DZTX)
#define INT_PTR		(1u << INT_V_PTR)
#define INT_PTP		(1u << INT_V_PTP)
#define INT_LP20	(1u << INT_V_LP20)

#define IPL_RP		6				/* int levels */
#define IPL_TU		6
#define IPL_DZRX	5
#define IPL_DZTX	5
#define IPL_PTR		4
#define IPL_PTP		4
#define IPL_LP20	4

#define INT_UB1		INT_RP				/* on Unibus 1 */
#define INT_UB3		(0xFFFFFFFFu & ~INT_UB1)	/* on Unibus 3 */

#define INT_IPL7	0x0000000F			/* int level masks */
#define INT_IPL6	0x000000F0
#define INT_IPL5	0x000FFF00
#define INT_IPL4	0x3FF00000

#define VEC_PTR		0070				/* interrupt vectors */
#define VEC_PTP		0074
#define VEC_TU		0224
#define VEC_RP		0254
#define VEC_DZRX	0340
#define VEC_DZTX	0344
#define VEC_LP20	0754

#define IREQ(dv)	int_req
#define SET_INT(dv)	IREQ(dv) = IREQ(dv) | (INT_##dv)
#define CLR_INT(dv)	IREQ(dv) = IREQ(dv) & ~(INT_##dv)