VAX/vax610_sysdev.c - emulators/simh - Rivoreo Source Code Repositories

 /* vax610_sysdev.c: MicroVAX I system-specific logic

    Copyright (c) 2011-2012, Matt Burke
    This module incorporates code from SimH, Copyright (c) 1998-2008, 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
    THE AUTHOR(S) 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(s) of the author(s) shall not be
    used in advertising or otherwise to promote the sale, use or other dealings
    in this Software without prior written authorization from the author(s).

    This module contains the MicroVAX I system-specific registers and devices.

    sysd         system devices

    15-Feb-2012  MB      First Version
 */

 #include "vax_defs.h"
 #include <time.h>

 #ifdef DONT_USE_INTERNAL_ROM
 #define BOOT_CODE_FILENAME "ka610.bin"
 #else /* !DONT_USE_INTERNAL_ROM */
 #include "vax_ka610_bin.h" /* Defines BOOT_CODE_FILENAME and BOOT_CODE_ARRAY, etc */
 #endif /* DONT_USE_INTERNAL_ROM */

 /* MicroVAX I boot device definitions */

 struct boot_dev {
     const char          *devname;
     const char          *devalias;
     int32               code;
     };

 extern DEVICE vc_dev, lk_dev, vs_dev;

 int32 conisp, conpc, conpsl;                            /* console reg */
 int32 sys_model = 0;                                    /* MicroVAX or VAXstation */
 char cpu_boot_cmd[CBUFSIZE]  = { 0 };                   /* boot command */

 static struct boot_dev boot_tab[] = {
     { "RQ",  "DUA", 0x00415544 },                       /* DUAn */
     { "RQ",  "DU",  0x00415544 },                       /* DUAn */
     { "XQ",  "XQA", 0x00415158 },                       /* XQAn */
     { NULL }
     };

 t_stat sysd_reset (DEVICE *dptr);
 const char *sysd_description (DEVICE *dptr);
 t_stat vax610_boot (int32 flag, CONST char *ptr);
 t_stat vax610_boot_parse (int32 flag, const char *ptr);

 extern int32 vc_mem_rd (int32 pa);
 extern void vc_mem_wr (int32 pa, int32 val, int32 lnt);
 extern int32 iccs_rd (void);
 extern int32 todr_rd (void);
 extern int32 rxcs_rd (void);
 extern int32 rxdb_rd (void);
 extern int32 txcs_rd (void);
 extern void iccs_wr (int32 dat);
 extern void todr_wr (int32 dat);
 extern void rxcs_wr (int32 dat);
 extern void txcs_wr (int32 dat);
 extern void txdb_wr (int32 dat);
 extern void ioreset_wr (int32 dat);

 /* SYSD data structures

    sysd_dev     SYSD device descriptor
    sysd_unit    SYSD units
    sysd_reg     SYSD register list
 */

 UNIT sysd_unit = { UDATA (NULL, 0, 0) };

 REG sysd_reg[] = {
     { HRDATAD (CONISP, conisp, 32, "console ISP") },
     { HRDATAD (CONPC,   conpc, 32, "console PD") },
     { HRDATAD (CONPSL, conpsl, 32, "console PSL") },
     { BRDATA (BOOTCMD, cpu_boot_cmd, 16, 8, CBUFSIZE), REG_HRO },
     { NULL }
     };

 DEVICE sysd_dev = {
     "SYSD", &sysd_unit, sysd_reg, NULL,
     1, 16, 16, 1, 16, 8,
     NULL, NULL, &sysd_reset,
     NULL, NULL, NULL,
     NULL, 0, 0, NULL, NULL, NULL, NULL, NULL, NULL,
     &sysd_description
     };

 /* Special boot command, overrides regular boot */

 CTAB vax610_cmd[] = {
     { "BOOT", &vax610_boot, RU_BOOT,
       "bo{ot} <device>{/R5:flg} boot device\n"
       "                         type HELP CPU to see bootable devices\n", NULL, &run_cmd_message },
     { NULL }
     };

 /* Read KA610 specific IPR's */

 int32 ReadIPR (int32 rg)
 {
 int32 val;

 switch (rg) {

     case MT_ICCS:                                       /* ICCS */
         val = iccs_rd ();
         break;

     case MT_RXCS:                                       /* RXCS */
         val = rxcs_rd ();
         break;

     case MT_RXDB:                                       /* RXDB */
         val = rxdb_rd ();
         break;

     case MT_TXCS:                                       /* TXCS */
         val = txcs_rd ();
         break;

     case MT_TXDB:                                       /* TXDB */
         val = 0;
         break;

     case MT_CONISP:                                     /* console ISP */
         val = conisp;
         break;

     case MT_CONPC:                                      /* console PC */
         val = conpc;
         break;

     case MT_CONPSL:                                     /* console PSL */
         val = conpsl;
         break;

     case MT_SID:                                        /* SID */
         val = (VAX610_SID | VAX610_FLOAT | VAX610_MREV | VAX610_HWREV);
         break;

     case MT_NICR:                                       /* NICR */
     case MT_ICR:                                        /* ICR */
     case MT_TODR:                                       /* TODR */
     case MT_CSRS:                                       /* CSRS */
     case MT_CSRD:                                       /* CSRD */
     case MT_CSTS:                                       /* CSTS */
     case MT_CSTD:                                       /* CSTD */
     case MT_TBDR:                                       /* TBDR */
     case MT_CADR:                                       /* CADR */
     case MT_MCESR:                                      /* MCESR */
     case MT_CAER:                                       /* CAER */
     case MT_SBIFS:                                      /* SBIFS */
     case MT_SBIS:                                       /* SBIS */
     case MT_SBISC:                                      /* SBISC */
     case MT_SBIMT:                                      /* SBIMT */
     case MT_SBIER:                                      /* SBIER */
     case MT_SBITA:                                      /* SBITA */
     case MT_SBIQC:                                      /* SBIQC */
     case MT_TBDATA:                                     /* TBDATA */
     case MT_MBRK:                                       /* MBRK */
     case MT_PME:                                        /* PME */
         val = 0;
         break;

     default:
         RSVD_OPND_FAULT;
         }

 return val;
 }

 /* Write KA610 specific IPR's */

 void WriteIPR (int32 rg, int32 val)
 {
 switch (rg) {

     case MT_ICCS:                                       /* ICCS */
         iccs_wr (val);
         break;

     case MT_RXCS:                                       /* RXCS */
         rxcs_wr (val);
         break;

     case MT_RXDB:                                       /* RXDB */
         break;

     case MT_TXCS:                                       /* TXCS */
         txcs_wr (val);
         break;

     case MT_TXDB:                                       /* TXDB */
         txdb_wr (val);
         break;

     case MT_IORESET:                                    /* IORESET */
         ioreset_wr (val);
         break;

     case MT_SID:
     case MT_CONISP:
     case MT_CONPC:
     case MT_CONPSL:                                     /* halt reg */
         RSVD_OPND_FAULT;

     case MT_NICR:                                       /* NICR */
     case MT_ICR:                                        /* ICR */
     case MT_TODR:                                       /* TODR */
     case MT_CSRS:                                       /* CSRS */
     case MT_CSRD:                                       /* CSRD */
     case MT_CSTS:                                       /* CSTS */
     case MT_CSTD:                                       /* CSTD */
     case MT_TBDR:                                       /* TBDR */
     case MT_CADR:                                       /* CADR */
     case MT_MCESR:                                      /* MCESR */
     case MT_CAER:                                       /* CAER */
     case MT_SBIFS:                                      /* SBIFS */
     case MT_SBIS:                                       /* SBIS */
     case MT_SBISC:                                      /* SBISC */
     case MT_SBIMT:                                      /* SBIMT */
     case MT_SBIER:                                      /* SBIER */
     case MT_SBITA:                                      /* SBITA */
     case MT_SBIQC:                                      /* SBIQC */
     case MT_TBDATA:                                     /* TBDATA */
     case MT_MBRK:                                       /* MBRK */
     case MT_PME:                                        /* PME */
         break;

     default:
         RSVD_OPND_FAULT;
         }

 return;
 }

 /* Read/write I/O register space

    These routines are the 'catch all' for address space map.  Any
    address that doesn't explicitly belong to memory or I/O
    is given to these routines for processing.
 */

 struct reglink {                                        /* register linkage */
     uint32      low;                                    /* low addr */
     uint32      high;                                   /* high addr */
     int32       (*read)(int32 pa);                      /* read routine */
     void        (*write)(int32 pa, int32 val, int32 lnt); /* write routine */
     };

 struct reglink regtable[] = {
     { QVMBASE, QVMBASE+QVMSIZE, &vc_mem_rd, &vc_mem_wr },
     { 0, 0, NULL, NULL }
     };

 /* ReadReg - read register space

    Inputs:
         pa      =       physical address
         lnt     =       length (BWLQ) - ignored
    Output:
         longword of data
 */

 int32 ReadReg (uint32 pa, int32 lnt)
 {
 struct reglink *p;

 for (p = &regtable[0]; p->low != 0; p++) {
     if ((pa >= p->low) && (pa < p->high) && p->read)
         return p->read (pa);
     }
 MACH_CHECK (MCHK_READ);
 }

 /* ReadRegU - read register space, unaligned

    Inputs:
         pa      =       physical address
         lnt     =       length in bytes (1, 2, or 3)
    Output:
         returned data, not shifted
 */

 int32 ReadRegU (uint32 pa, int32 lnt)
 {
 return ReadReg (pa & ~03, L_LONG);
 }

 /* WriteReg - write register space

    Inputs:
         pa      =       physical address
         val     =       data to write, right justified in 32b longword
         lnt     =       length (BWLQ)
    Outputs:
         none
 */

 void WriteReg (uint32 pa, int32 val, int32 lnt)
 {
 struct reglink *p;

 for (p = &regtable[0]; p->low != 0; p++) {
     if ((pa >= p->low) && (pa < p->high) && p->write) {
         p->write (pa, val, lnt);
         return;
         }
     }
 mem_err = 1;
 SET_IRQL;
 }

 /* WriteRegU - write register space, unaligned

    Inputs:
         pa      =       physical address
         val     =       data to write, right justified in 32b longword
         lnt     =       length (1, 2, or 3)
    Outputs:
         none
 */

 void WriteRegU (uint32 pa, int32 val, int32 lnt)
 {
 int32 sc = (pa & 03) << 3;
 int32 dat = ReadReg (pa & ~03, L_LONG);

 dat = (dat & ~(insert[lnt] << sc)) | ((val & insert[lnt]) << sc);
 WriteReg (pa & ~03, dat, L_LONG);
 return;
 }

 /* Special boot command - linked into SCP by initial reset

    Syntax: BOOT <device>{/R5:val}

    Sets up R0-R5, calls SCP boot processor with effective BOOT CPU
 */

 t_stat vax610_boot (int32 flag, CONST char *ptr)
 {
 t_stat r;

 r = vax610_boot_parse (flag, ptr);                      /* parse the boot cmd */
 if (r != SCPE_OK) {                                     /* error? */
     if (r >= SCPE_BASE) {                               /* message available? */
         sim_printf ("%s\n", sim_error_text (r));
         r |= SCPE_NOMESSAGE;
         }
     return r;
     }
 strncpy (cpu_boot_cmd, ptr, CBUFSIZE-1);                /* save for reboot */
 return run_cmd (flag, "CPU");
 }

 /* Parse boot command, set up registers - also used on reset */

 t_stat vax610_boot_parse (int32 flag, const char *ptr)
 {
 char gbuf[CBUFSIZE], dbuf[CBUFSIZE], rbuf[CBUFSIZE];
 char *slptr;
 const char *regptr;
 int32 i, r5v, unitno;
 DEVICE *dptr;
 UNIT *uptr;
 t_stat r;

 if (ptr == NULL)
     return SCPE_ARG;
 if (*ptr == '/') {                                      /* handle "BOOT /R5:n DEV" format */
     ptr = get_glyph (ptr, rbuf, 0);                     /* get glyph */
     regptr = rbuf;
     ptr = get_glyph (ptr, gbuf, 0);                     /* get glyph */
     }
 else {                                                  /* handle "BOOT DEV /R5:n" format */
     regptr = get_glyph (ptr, gbuf, 0);                  /* get glyph */
     if ((slptr = strchr (gbuf, '/'))) {                 /* found slash? */
         regptr = strchr (ptr, '/');                     /* locate orig */
         *slptr = 0;                                     /* zero in string */
         }
     }
 /* parse R5 parameter value */
 r5v = 0;
 /* coverity[NULL_RETURNS] */
 if ((strncmp (regptr, "/R5:", 4) == 0) ||
     (strncmp (regptr, "/R5=", 4) == 0) ||
     (strncmp (regptr, "/r5:", 4) == 0) ||
     (strncmp (regptr, "/r5=", 4) == 0)) {
     r5v = (int32) get_uint (regptr + 4, 16, LMASK, &r);
     if (r != SCPE_OK)
         return r;
     }
 else if (*regptr == '/') {
     r5v = (int32) get_uint (regptr + 1, 16, LMASK, &r);
     if (r != SCPE_OK)
         return r;
     }
 else if (*regptr != 0)
     return SCPE_ARG;
 if (gbuf[0]) {
     unitno = -1;
     for (i = 0; boot_tab[i].devname != NULL; i++) {
         if (memcmp (gbuf, boot_tab[i].devalias, strlen(boot_tab[i].devalias)) == 0) {
             sprintf(dbuf, "%s%s", boot_tab[i].devname, gbuf + strlen(boot_tab[i].devalias));
             dptr = find_unit (dbuf, &uptr);
             if ((dptr == NULL) || (uptr == NULL))
                 return SCPE_ARG;
             unitno = (int32) (uptr - dptr->units);
             }
         if ((unitno == -1) &&
             (memcmp (gbuf, boot_tab[i].devname, strlen(boot_tab[i].devname)) == 0)) {
             sprintf(dbuf, "%s%s", boot_tab[i].devname, gbuf + strlen(boot_tab[i].devname));
             dptr = find_unit (dbuf, &uptr);
             if ((dptr == NULL) || (uptr == NULL))
                 return SCPE_ARG;
             unitno = (int32) (uptr - dptr->units);
             }
         if (unitno == -1)
             continue;
         R[0] = boot_tab[i].code | (('0' + unitno) << 24);
         R[1] = (sys_model ? 0x80 : 0xC0);
         R[2] = 0;
         R[3] = 0;
         R[4] = 0;
         R[5] = r5v;
         return SCPE_OK;
         }
     }
 else {
     R[0] = 0;
     R[1] = (sys_model ? 0x80 : 0xC0);
     R[2] = 0;
     R[3] = 0;
     R[4] = 0;
     R[5] = r5v;
     return SCPE_OK;
     }
 return SCPE_NOFNC;
 }

 int32 sysd_hlt_enb (void)
 {
 return 1;
 }

 /* Machine check */

 int32 machine_check (int32 p1, int32 opc, int32 cc, int32 delta)
 {
 int32 p2, acc;

 if (in_ie)                                              /* in exc? panic */
     ABORT (STOP_INIE);
 p2 = mchk_va + 4;                                       /* save vap */
 cc = intexc (SCB_MCHK, cc, 0, IE_EXC);                  /* take exception */
 acc = ACC_MASK (KERN);                                  /* in kernel mode */
 in_ie = 1;
 SP = SP - 16;                                           /* push 4 words */
 Write (SP, 12, L_LONG, WA);                             /* # bytes */
 Write (SP + 4, p1, L_LONG, WA);                         /* mcheck type */
 Write (SP + 8, p2, L_LONG, WA);                         /* parameter 1 */
 Write (SP + 12, p2, L_LONG, WA);                        /* parameter 2 */
 in_ie = 0;
 return cc;
 }

 /* Console entry */

 int32 con_halt (int32 code, int32 cc)
 {
 if ((vax610_boot_parse (0, cpu_boot_cmd) != SCPE_OK) || /* reparse the boot cmd */
     (reset_all (0) != SCPE_OK) ||                       /* reset the world */
     (cpu_boot (0, NULL) != SCPE_OK))                    /* set up boot code */
     ABORT (STOP_BOOT);                                  /* any error? */
 sim_printf ("Rebooting...\n");
 return cc;
 }

 /* Bootstrap */

 t_stat cpu_boot (int32 unitno, DEVICE *dptr)
 {
 t_stat r;

 r = cpu_load_bootcode (BOOT_CODE_FILENAME, BOOT_CODE_ARRAY, BOOT_CODE_SIZE, FALSE, 0x200);
 if (r != SCPE_OK)
     return r;
 SP = PC = 512;
 AP = 1;
 return SCPE_OK;
 }

 /* SYSD reset */

 t_stat sysd_reset (DEVICE *dptr)
 {
 sim_vm_cmd = vax610_cmd;
 return SCPE_OK;
 }

 const char *sysd_description (DEVICE *dptr)
 {
 return "system devices";
 }

 t_stat cpu_set_model (UNIT *uptr, int32 val, CONST char *cptr, void *desc)
 {
 char gbuf[CBUFSIZE];

 if ((cptr == NULL) || (!*cptr))
     return SCPE_ARG;
 cptr = get_glyph (cptr, gbuf, 0);
 if (MATCH_CMD(gbuf, "MICROVAX") == 0) {
     sys_model = 0;
 #if defined(USE_SIM_VIDEO) && defined(HAVE_LIBSDL)
     vc_dev.flags = vc_dev.flags | DEV_DIS;               /* disable QVSS */
     lk_dev.flags = lk_dev.flags | DEV_DIS;               /* disable keyboard */
     vs_dev.flags = vs_dev.flags | DEV_DIS;               /* disable mouse */
 #endif
     strcpy (sim_name, "MicroVAX I (KA610)");
     reset_all (0);                                       /* reset everything */
     }
 else if (MATCH_CMD(gbuf, "VAXSTATION") == 0) {
 #if defined(USE_SIM_VIDEO) && defined(HAVE_LIBSDL)
     sys_model = 1;
     vc_dev.flags = vc_dev.flags & ~DEV_DIS;              /* enable QVSS */
     lk_dev.flags = lk_dev.flags & ~DEV_DIS;              /* enable keyboard */
     vs_dev.flags = vs_dev.flags & ~DEV_DIS;              /* enable mouse */
     strcpy (sim_name, "VAXStation I (KA610)");
     reset_all (0);                                       /* reset everything */
 #else
     return sim_messagef(SCPE_ARG, "Simulator built without Graphic Device Support");
 #endif
     }
 else
     return SCPE_ARG;
 return SCPE_OK;
 }

 t_stat cpu_print_model (FILE *st)
 {
 fprintf (st, (sys_model ? "VAXstation I" : "MicroVAX I"));
 return SCPE_OK;
 }

 t_stat cpu_model_help (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, const char *cptr)
 {
 fprintf (st, "Initial memory size is 4MB.\n\n");
 fprintf (st, "The simulator is booted with the BOOT command:\n\n");
 fprintf (st, "   sim> BO{OT} <device>{/R5:flags}\n\n");
 fprintf (st, "where <device> is one of:\n\n");
 fprintf (st, "   RQn        to boot from rqn\n");
 fprintf (st, "   DUn        to boot from rqn\n");
 fprintf (st, "   DUAn       to boot from rqn\n");
 fprintf (st, "   XQ         to boot from xq\n");
 fprintf (st, "   XQA        to boot from xq\n\n");
 return SCPE_OK;
 }
	/* vax610_sysdev.c: MicroVAX I system-specific logic

	Copyright (c) 2011-2012, Matt Burke
	This module incorporates code from SimH, Copyright (c) 1998-2008, 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
	THE AUTHOR(S) 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(s) of the author(s) shall not be
	used in advertising or otherwise to promote the sale, use or other dealings
	in this Software without prior written authorization from the author(s).

	This module contains the MicroVAX I system-specific registers and devices.

	sysd system devices

	15-Feb-2012 MB First Version
	*/

	#include "vax_defs.h"
	#include <time.h>

	#ifdef DONT_USE_INTERNAL_ROM
	#define BOOT_CODE_FILENAME "ka610.bin"
	#else /* !DONT_USE_INTERNAL_ROM */
	#include "vax_ka610_bin.h" /* Defines BOOT_CODE_FILENAME and BOOT_CODE_ARRAY, etc */
	#endif /* DONT_USE_INTERNAL_ROM */

	/* MicroVAX I boot device definitions */

	struct boot_dev {
	const char *devname;
	const char *devalias;
	int32 code;
	};

	extern DEVICE vc_dev, lk_dev, vs_dev;

	int32 conisp, conpc, conpsl; /* console reg */
	int32 sys_model = 0; /* MicroVAX or VAXstation */
	char cpu_boot_cmd[CBUFSIZE] = { 0 }; /* boot command */

	static struct boot_dev boot_tab[] = {
	{ "RQ", "DUA", 0x00415544 }, /* DUAn */
	{ "RQ", "DU", 0x00415544 }, /* DUAn */
	{ "XQ", "XQA", 0x00415158 }, /* XQAn */
	{ NULL }
	};

	t_stat sysd_reset (DEVICE *dptr);
	const char sysd_description (DEVICE dptr);
	t_stat vax610_boot (int32 flag, CONST char *ptr);
	t_stat vax610_boot_parse (int32 flag, const char *ptr);

	extern int32 vc_mem_rd (int32 pa);
	extern void vc_mem_wr (int32 pa, int32 val, int32 lnt);
	extern int32 iccs_rd (void);
	extern int32 todr_rd (void);
	extern int32 rxcs_rd (void);
	extern int32 rxdb_rd (void);
	extern int32 txcs_rd (void);
	extern void iccs_wr (int32 dat);
	extern void todr_wr (int32 dat);
	extern void rxcs_wr (int32 dat);
	extern void txcs_wr (int32 dat);
	extern void txdb_wr (int32 dat);
	extern void ioreset_wr (int32 dat);

	/* SYSD data structures

	sysd_dev SYSD device descriptor
	sysd_unit SYSD units
	sysd_reg SYSD register list
	*/

	UNIT sysd_unit = { UDATA (NULL, 0, 0) };

	REG sysd_reg[] = {
	{ HRDATAD (CONISP, conisp, 32, "console ISP") },
	{ HRDATAD (CONPC, conpc, 32, "console PD") },
	{ HRDATAD (CONPSL, conpsl, 32, "console PSL") },
	{ BRDATA (BOOTCMD, cpu_boot_cmd, 16, 8, CBUFSIZE), REG_HRO },
	{ NULL }
	};

	DEVICE sysd_dev = {
	"SYSD", &sysd_unit, sysd_reg, NULL,
	1, 16, 16, 1, 16, 8,
	NULL, NULL, &sysd_reset,
	NULL, NULL, NULL,
	NULL, 0, 0, NULL, NULL, NULL, NULL, NULL, NULL,
	&sysd_description
	};

	/* Special boot command, overrides regular boot */

	CTAB vax610_cmd[] = {
	{ "BOOT", &vax610_boot, RU_BOOT,
	"bo{ot} <device>{/R5:flg} boot device\n"
	" type HELP CPU to see bootable devices\n", NULL, &run_cmd_message },
	{ NULL }
	};

	/* Read KA610 specific IPR's */

	int32 ReadIPR (int32 rg)
	{
	int32 val;

	switch (rg) {

	case MT_ICCS: /* ICCS */
	val = iccs_rd ();
	break;

	case MT_RXCS: /* RXCS */
	val = rxcs_rd ();
	break;

	case MT_RXDB: /* RXDB */
	val = rxdb_rd ();
	break;

	case MT_TXCS: /* TXCS */
	val = txcs_rd ();
	break;

	case MT_TXDB: /* TXDB */
	val = 0;
	break;

	case MT_CONISP: /* console ISP */
	val = conisp;
	break;

	case MT_CONPC: /* console PC */
	val = conpc;
	break;

	case MT_CONPSL: /* console PSL */
	val = conpsl;
	break;

	case MT_SID: /* SID */
	val = (VAX610_SID \| VAX610_FLOAT \| VAX610_MREV \| VAX610_HWREV);
	break;

	case MT_NICR: /* NICR */
	case MT_ICR: /* ICR */
	case MT_TODR: /* TODR */
	case MT_CSRS: /* CSRS */
	case MT_CSRD: /* CSRD */
	case MT_CSTS: /* CSTS */
	case MT_CSTD: /* CSTD */
	case MT_TBDR: /* TBDR */
	case MT_CADR: /* CADR */
	case MT_MCESR: /* MCESR */
	case MT_CAER: /* CAER */
	case MT_SBIFS: /* SBIFS */
	case MT_SBIS: /* SBIS */
	case MT_SBISC: /* SBISC */
	case MT_SBIMT: /* SBIMT */
	case MT_SBIER: /* SBIER */
	case MT_SBITA: /* SBITA */
	case MT_SBIQC: /* SBIQC */
	case MT_TBDATA: /* TBDATA */
	case MT_MBRK: /* MBRK */
	case MT_PME: /* PME */
	val = 0;
	break;

	default:
	RSVD_OPND_FAULT;
	}

	return val;
	}

	/* Write KA610 specific IPR's */

	void WriteIPR (int32 rg, int32 val)
	{
	switch (rg) {

	case MT_ICCS: /* ICCS */
	iccs_wr (val);
	break;

	case MT_RXCS: /* RXCS */
	rxcs_wr (val);
	break;

	case MT_RXDB: /* RXDB */
	break;

	case MT_TXCS: /* TXCS */
	txcs_wr (val);
	break;

	case MT_TXDB: /* TXDB */
	txdb_wr (val);
	break;

	case MT_IORESET: /* IORESET */
	ioreset_wr (val);
	break;

	case MT_SID:
	case MT_CONISP:
	case MT_CONPC:
	case MT_CONPSL: /* halt reg */
	RSVD_OPND_FAULT;

	case MT_NICR: /* NICR */
	case MT_ICR: /* ICR */
	case MT_TODR: /* TODR */
	case MT_CSRS: /* CSRS */
	case MT_CSRD: /* CSRD */
	case MT_CSTS: /* CSTS */
	case MT_CSTD: /* CSTD */
	case MT_TBDR: /* TBDR */
	case MT_CADR: /* CADR */
	case MT_MCESR: /* MCESR */
	case MT_CAER: /* CAER */
	case MT_SBIFS: /* SBIFS */
	case MT_SBIS: /* SBIS */
	case MT_SBISC: /* SBISC */
	case MT_SBIMT: /* SBIMT */
	case MT_SBIER: /* SBIER */
	case MT_SBITA: /* SBITA */
	case MT_SBIQC: /* SBIQC */
	case MT_TBDATA: /* TBDATA */
	case MT_MBRK: /* MBRK */
	case MT_PME: /* PME */
	break;

	default:
	RSVD_OPND_FAULT;
	}

	return;
	}

	/* Read/write I/O register space

	These routines are the 'catch all' for address space map. Any
	address that doesn't explicitly belong to memory or I/O
	is given to these routines for processing.
	*/

	struct reglink { /* register linkage */
	uint32 low; /* low addr */
	uint32 high; /* high addr */
	int32 (read)(int32 pa); / read routine */
	void (write)(int32 pa, int32 val, int32 lnt); / write routine */
	};

	struct reglink regtable[] = {
	{ QVMBASE, QVMBASE+QVMSIZE, &vc_mem_rd, &vc_mem_wr },
	{ 0, 0, NULL, NULL }
	};

	/* ReadReg - read register space

	Inputs:
	pa = physical address
	lnt = length (BWLQ) - ignored
	Output:
	longword of data
	*/

	int32 ReadReg (uint32 pa, int32 lnt)
	{
	struct reglink *p;

	for (p = &regtable[0]; p->low != 0; p++) {
	if ((pa >= p->low) && (pa < p->high) && p->read)
	return p->read (pa);
	}
	MACH_CHECK (MCHK_READ);
	}

	/* ReadRegU - read register space, unaligned

	Inputs:
	pa = physical address
	lnt = length in bytes (1, 2, or 3)
	Output:
	returned data, not shifted
	*/

	int32 ReadRegU (uint32 pa, int32 lnt)
	{
	return ReadReg (pa & ~03, L_LONG);
	}

	/* WriteReg - write register space

	Inputs:
	pa = physical address
	val = data to write, right justified in 32b longword
	lnt = length (BWLQ)
	Outputs:
	none
	*/

	void WriteReg (uint32 pa, int32 val, int32 lnt)
	{
	struct reglink *p;

	for (p = &regtable[0]; p->low != 0; p++) {
	if ((pa >= p->low) && (pa < p->high) && p->write) {
	p->write (pa, val, lnt);
	return;
	}
	}
	mem_err = 1;
	SET_IRQL;
	}

	/* WriteRegU - write register space, unaligned

	Inputs:
	pa = physical address
	val = data to write, right justified in 32b longword
	lnt = length (1, 2, or 3)
	Outputs:
	none
	*/

	void WriteRegU (uint32 pa, int32 val, int32 lnt)
	{
	int32 sc = (pa & 03) << 3;
	int32 dat = ReadReg (pa & ~03, L_LONG);

	dat = (dat & ~(insert[lnt] << sc)) \| ((val & insert[lnt]) << sc);
	WriteReg (pa & ~03, dat, L_LONG);
	return;
	}

	/* Special boot command - linked into SCP by initial reset

	Syntax: BOOT <device>{/R5:val}

	Sets up R0-R5, calls SCP boot processor with effective BOOT CPU
	*/

	t_stat vax610_boot (int32 flag, CONST char *ptr)
	{
	t_stat r;

	r = vax610_boot_parse (flag, ptr); /* parse the boot cmd */
	if (r != SCPE_OK) { /* error? */
	if (r >= SCPE_BASE) { /* message available? */
	sim_printf ("%s\n", sim_error_text (r));
	r \|= SCPE_NOMESSAGE;
	}
	return r;
	}
	strncpy (cpu_boot_cmd, ptr, CBUFSIZE-1); /* save for reboot */
	return run_cmd (flag, "CPU");
	}

	/* Parse boot command, set up registers - also used on reset */

	t_stat vax610_boot_parse (int32 flag, const char *ptr)
	{
	char gbuf[CBUFSIZE], dbuf[CBUFSIZE], rbuf[CBUFSIZE];
	char *slptr;
	const char *regptr;
	int32 i, r5v, unitno;
	DEVICE *dptr;
	UNIT *uptr;
	t_stat r;

	if (ptr == NULL)
	return SCPE_ARG;
	if (ptr == '/') { / handle "BOOT /R5:n DEV" format */
	ptr = get_glyph (ptr, rbuf, 0); /* get glyph */
	regptr = rbuf;
	ptr = get_glyph (ptr, gbuf, 0); /* get glyph */
	}
	else { /* handle "BOOT DEV /R5:n" format */
	regptr = get_glyph (ptr, gbuf, 0); /* get glyph */
	if ((slptr = strchr (gbuf, '/'))) { /* found slash? */
	regptr = strchr (ptr, '/'); /* locate orig */
	slptr = 0; / zero in string */
	}
	}
	/* parse R5 parameter value */
	r5v = 0;
	/* coverity[NULL_RETURNS] */
	if ((strncmp (regptr, "/R5:", 4) == 0) \|\|
	(strncmp (regptr, "/R5=", 4) == 0) \|\|
	(strncmp (regptr, "/r5:", 4) == 0) \|\|
	(strncmp (regptr, "/r5=", 4) == 0)) {
	r5v = (int32) get_uint (regptr + 4, 16, LMASK, &r);
	if (r != SCPE_OK)
	return r;
	}
	else if (*regptr == '/') {
	r5v = (int32) get_uint (regptr + 1, 16, LMASK, &r);
	if (r != SCPE_OK)
	return r;
	}
	else if (*regptr != 0)
	return SCPE_ARG;
	if (gbuf[0]) {
	unitno = -1;
	for (i = 0; boot_tab[i].devname != NULL; i++) {
	if (memcmp (gbuf, boot_tab[i].devalias, strlen(boot_tab[i].devalias)) == 0) {
	sprintf(dbuf, "%s%s", boot_tab[i].devname, gbuf + strlen(boot_tab[i].devalias));
	dptr = find_unit (dbuf, &uptr);
	if ((dptr == NULL) \|\| (uptr == NULL))
	return SCPE_ARG;
	unitno = (int32) (uptr - dptr->units);
	}
	if ((unitno == -1) &&
	(memcmp (gbuf, boot_tab[i].devname, strlen(boot_tab[i].devname)) == 0)) {
	sprintf(dbuf, "%s%s", boot_tab[i].devname, gbuf + strlen(boot_tab[i].devname));
	dptr = find_unit (dbuf, &uptr);
	if ((dptr == NULL) \|\| (uptr == NULL))
	return SCPE_ARG;
	unitno = (int32) (uptr - dptr->units);
	}
	if (unitno == -1)
	continue;
	R[0] = boot_tab[i].code \| (('0' + unitno) << 24);
	R[1] = (sys_model ? 0x80 : 0xC0);
	R[2] = 0;
	R[3] = 0;
	R[4] = 0;
	R[5] = r5v;
	return SCPE_OK;
	}
	}
	else {
	R[0] = 0;
	R[1] = (sys_model ? 0x80 : 0xC0);
	R[2] = 0;
	R[3] = 0;
	R[4] = 0;
	R[5] = r5v;
	return SCPE_OK;
	}
	return SCPE_NOFNC;
	}

	int32 sysd_hlt_enb (void)
	{
	return 1;
	}

	/* Machine check */

	int32 machine_check (int32 p1, int32 opc, int32 cc, int32 delta)
	{
	int32 p2, acc;

	if (in_ie) /* in exc? panic */
	ABORT (STOP_INIE);
	p2 = mchk_va + 4; /* save vap */
	cc = intexc (SCB_MCHK, cc, 0, IE_EXC); /* take exception */
	acc = ACC_MASK (KERN); /* in kernel mode */
	in_ie = 1;
	SP = SP - 16; /* push 4 words */
	Write (SP, 12, L_LONG, WA); /* # bytes */
	Write (SP + 4, p1, L_LONG, WA); /* mcheck type */
	Write (SP + 8, p2, L_LONG, WA); /* parameter 1 */
	Write (SP + 12, p2, L_LONG, WA); /* parameter 2 */
	in_ie = 0;
	return cc;
	}

	/* Console entry */

	int32 con_halt (int32 code, int32 cc)
	{
	if ((vax610_boot_parse (0, cpu_boot_cmd) != SCPE_OK) \|\| /* reparse the boot cmd */
	(reset_all (0) != SCPE_OK) \|\| /* reset the world */
	(cpu_boot (0, NULL) != SCPE_OK)) /* set up boot code */
	ABORT (STOP_BOOT); /* any error? */
	sim_printf ("Rebooting...\n");
	return cc;
	}

	/* Bootstrap */

	t_stat cpu_boot (int32 unitno, DEVICE *dptr)
	{
	t_stat r;

	r = cpu_load_bootcode (BOOT_CODE_FILENAME, BOOT_CODE_ARRAY, BOOT_CODE_SIZE, FALSE, 0x200);
	if (r != SCPE_OK)
	return r;
	SP = PC = 512;
	AP = 1;
	return SCPE_OK;
	}

	/* SYSD reset */

	t_stat sysd_reset (DEVICE *dptr)
	{
	sim_vm_cmd = vax610_cmd;
	return SCPE_OK;
	}

	const char sysd_description (DEVICE dptr)
	{
	return "system devices";
	}

	t_stat cpu_set_model (UNIT uptr, int32 val, CONST char cptr, void *desc)
	{
	char gbuf[CBUFSIZE];

	if ((cptr == NULL) \|\| (!*cptr))
	return SCPE_ARG;
	cptr = get_glyph (cptr, gbuf, 0);
	if (MATCH_CMD(gbuf, "MICROVAX") == 0) {
	sys_model = 0;
	#if defined(USE_SIM_VIDEO) && defined(HAVE_LIBSDL)
	vc_dev.flags = vc_dev.flags \| DEV_DIS; /* disable QVSS */
	lk_dev.flags = lk_dev.flags \| DEV_DIS; /* disable keyboard */
	vs_dev.flags = vs_dev.flags \| DEV_DIS; /* disable mouse */
	#endif
	strcpy (sim_name, "MicroVAX I (KA610)");
	reset_all (0); /* reset everything */
	}
	else if (MATCH_CMD(gbuf, "VAXSTATION") == 0) {
	#if defined(USE_SIM_VIDEO) && defined(HAVE_LIBSDL)
	sys_model = 1;
	vc_dev.flags = vc_dev.flags & ~DEV_DIS; /* enable QVSS */
	lk_dev.flags = lk_dev.flags & ~DEV_DIS; /* enable keyboard */
	vs_dev.flags = vs_dev.flags & ~DEV_DIS; /* enable mouse */
	strcpy (sim_name, "VAXStation I (KA610)");
	reset_all (0); /* reset everything */
	#else
	return sim_messagef(SCPE_ARG, "Simulator built without Graphic Device Support");
	#endif
	}
	else
	return SCPE_ARG;
	return SCPE_OK;
	}

	t_stat cpu_print_model (FILE *st)
	{
	fprintf (st, (sys_model ? "VAXstation I" : "MicroVAX I"));
	return SCPE_OK;
	}

	t_stat cpu_model_help (FILE st, DEVICE dptr, UNIT uptr, int32 flag, const char cptr)
	{
	fprintf (st, "Initial memory size is 4MB.\n\n");
	fprintf (st, "The simulator is booted with the BOOT command:\n\n");
	fprintf (st, " sim> BO{OT} <device>{/R5:flags}\n\n");
	fprintf (st, "where <device> is one of:\n\n");
	fprintf (st, " RQn to boot from rqn\n");
	fprintf (st, " DUn to boot from rqn\n");
	fprintf (st, " DUAn to boot from rqn\n");
	fprintf (st, " XQ to boot from xq\n");
	fprintf (st, " XQA to boot from xq\n\n");
	return SCPE_OK;
	}