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      1 /*	$NetBSD: findcpu.c,v 1.20 2017/05/22 16:39:41 ragge Exp $	*/
      2 /*
      3  * Copyright (c) 1994, 1998 Ludd, University of Lule}, Sweden.
      4  * All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     25  */
     26 
     27 #include <sys/cdefs.h>
     28 __KERNEL_RCSID(0, "$NetBSD: findcpu.c,v 1.20 2017/05/22 16:39:41 ragge Exp $");
     29 
     30 #include <sys/param.h>
     31 #ifdef _KERNEL
     32 #include <sys/device.h>
     33 #endif
     34 
     35 #include <machine/sid.h>
     36 #include <machine/nexus.h>
     37 #include <machine/mtpr.h>
     38 #include <machine/cpu.h>
     39 
     40 /*
     41  * We set up some information about the machine we're
     42  * running on and thus initializes/uses vax_cputype and vax_boardtype.
     43  * There should be no need to change/reinitialize these variables
     44  * outside of this routine, they should be read only!
     45  */
     46 int vax_cputype;	/* highest byte of SID register */
     47 int vax_bustype;	/* holds/defines all busses on this machine */
     48 int vax_boardtype;	/* machine dependent, combination of SID and SIE */
     49 
     50 int vax_cpudata;	/* contents of the SID register */
     51 int vax_siedata;	/* contents of the SIE register */
     52 int vax_confdata;	/* machine dependent, configuration/setup data */
     53 
     54 /*
     55  * Try to figure out which type of system this is.
     56  */
     57 void
     58 findcpu(void)
     59 {
     60 	vax_cpudata = mfpr(PR_SID);
     61 	vax_cputype = vax_cpudata >> 24;
     62 	vax_boardtype = vax_cputype << 24;
     63 
     64 	switch (vax_cputype) {
     65 	case VAX_TYP_730:
     66 		vax_bustype = VAX_UNIBUS;
     67 		break;
     68 	case VAX_TYP_780:
     69 		vax_bustype = VAX_SBIBUS;
     70 		break;
     71 	case VAX_TYP_750:
     72 		vax_bustype = VAX_CMIBUS;
     73 		break;
     74 	case VAX_TYP_790:
     75 		vax_bustype = VAX_ABUS;
     76 		break;
     77 
     78 	case VAX_TYP_UV1:
     79 		vax_bustype = VAX_IBUS;
     80 		break;
     81 
     82 	case VAX_TYP_UV2:
     83 	case VAX_TYP_CVAX:
     84 	case VAX_TYP_RIGEL:
     85 	case VAX_TYP_MARIAH:
     86 	case VAX_TYP_NVAX:
     87 	case VAX_TYP_SOC:
     88 		vax_siedata = *(int *)(0x20040004);	/* SIE address */
     89 		vax_boardtype |= vax_siedata >> 24;
     90 
     91 		switch (vax_boardtype) {
     92 		case VAX_BTYP_420: /* They are very similar */
     93 		case VAX_BTYP_410:
     94 		case VAX_BTYP_43:
     95 		case VAX_BTYP_46:
     96 		case VAX_BTYP_48:
     97 		case VAX_BTYP_IS1:
     98 			vax_confdata = *(int *)(0x20020000);
     99 			vax_bustype = VAX_VSBUS;
    100 			break;
    101 		case VAX_BTYP_49:
    102 			vax_confdata = *(int *)(0x25800000);
    103 			vax_bustype = VAX_VSBUS;
    104 			break;
    105 
    106 		case VAX_BTYP_9CC:
    107 		case VAX_BTYP_9RR:
    108 		case VAX_BTYP_1202:
    109 		case VAX_BTYP_1302:
    110 			vax_bustype = VAX_XMIBUS;
    111 			break;
    112 
    113 		case VAX_BTYP_670:
    114 		case VAX_BTYP_660:
    115 		case VAX_BTYP_60:
    116 		case VAX_BTYP_680:
    117 		case VAX_BTYP_681:
    118 		case VAX_BTYP_630:
    119 		case VAX_BTYP_650:
    120 		case VAX_BTYP_53:
    121 			vax_bustype = VAX_IBUS;
    122 			break;
    123 
    124 		}
    125 		break;
    126 
    127 	case VAX_TYP_8SS:
    128 		vax_boardtype = VAX_BTYP_8000;
    129 		vax_bustype = VAX_BIBUS;
    130 		break;
    131 
    132 	case VAX_TYP_8NN:
    133 		vax_boardtype = VAX_BTYP_8800; /* subversion later */
    134 		vax_bustype = VAX_NMIBUS;
    135 		break;
    136 
    137 	case VAX_TYP_8PS:
    138 		vax_boardtype = VAX_BTYP_8PS;
    139 		vax_bustype = VAX_NMIBUS;
    140 		break;
    141 
    142 	default:
    143 		/* CPU not supported, just give up */
    144 		__asm("halt");
    145 	}
    146 }
    147