1 /*-
2 * Copyright (c) 1999 Matthew N. Dodd <winter@jurai.net>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD$
27 */
28
29 #include <sys/param.h>
30 #include <sys/systm.h>
31 #include <sys/kernel.h>
32 #include <vm/vm.h>
33 #include <vm/pmap.h>
34 #include <machine/pmap.h>
35 #include <machine/md_var.h>
36 #include <machine/vm86.h>
37 #include <machine/pc/bios.h>
38 #include <machine/cpufunc.h>
39
40 #include <dev/mca/mca_busreg.h>
41 #include <i386/isa/mca_machdep.h>
42
43 /* Global MCA bus flag */
44 int MCA_system = 0;
45
46 /* System Configuration Block */
47 struct sys_config {
48 u_int16_t count;
49 u_int8_t model;
50 u_int8_t submodel;
51 u_int8_t bios_rev;
52 u_int8_t feature;
53 #define FEATURE_RESV 0x01 /* Reserved */
54 #define FEATURE_MCABUS 0x02 /* MicroChannel Architecture */
55 #define FEATURE_EBDA 0x04 /* Extended BIOS data area allocated */
56 #define FEATURE_WAITEV 0x08 /* Wait for external event is supported */
57 #define FEATURE_KBDINT 0x10 /* Keyboard intercept called by Int 09h */
58 #define FEATURE_RTC 0x20 /* Real-time clock present */
59 #define FEATURE_IC2 0x40 /* Second interrupt chip present */
60 #define FEATURE_DMA3 0x80 /* DMA channel 3 used by hard disk BIOS */
61 u_int8_t pad[3];
62 } __attribute__ ((packed));
63
64 /* Function Prototypes */
65 static void bios_mcabus_present (void *);
66 SYSINIT(mca_present, SI_SUB_CPU, SI_ORDER_ANY, bios_mcabus_present, NULL);
67
68 /* Functions */
69 static void
70 bios_mcabus_present(void * dummy)
71 {
72 struct vm86frame vmf;
73 struct sys_config * scp;
74 vm_offset_t paddr;
75
76 bzero(&vmf, sizeof(struct vm86frame));
77
78 vmf.vmf_ah = 0xc0;
79 if (vm86_intcall(0x15, &vmf)) {
80 if (bootverbose) {
81 printf("BIOS SDT: INT call failed.\n");
82 }
83 return;
84 }
85
86 if ((vmf.vmf_ah != 0) && (vmf.vmf_flags & 0x01)) {
87 if (bootverbose) {
88 printf("BIOS SDT: Not supported. Not PS/2?\n");
89 printf("BIOS SDT: AH 0x%02x, Flags 0x%04x\n",
90 vmf.vmf_ah, vmf.vmf_flags);
91 }
92 return;
93 }
94
95 paddr = vmf.vmf_es;
96 paddr = (paddr << 4) + vmf.vmf_bx;
97 scp = (struct sys_config *)BIOS_PADDRTOVADDR(paddr);
98
99 if (bootverbose) {
100 printf("BIOS SDT: model 0x%02x, submodel 0x%02x, bios_rev 0x%02x\n",
101 scp->model, scp->submodel, scp->bios_rev);
102 printf("BIOS SDT: features 0x%b\n", scp->feature,
103 "\2"
104 "\01RESV"
105 "\02MCABUS"
106 "\03EBDA"
107 "\04WAITEV"
108 "\05KBDINT"
109 "\06RTC"
110 "\07IC2"
111 "\08DMA3\n");
112 }
113
114 MCA_system = ((scp->feature & FEATURE_MCABUS) ? 1 : 0);
115
116 if (MCA_system)
117 printf("MicroChannel Architecture System detected.\n");
118
119 return;
120 }
121
122 int
123 mca_bus_nmi (void)
124 {
125 int slot;
126 int retval = 0;
127 int pos5 = 0;
128
129 /* Disable motherboard setup */
130 outb(MCA_MB_SETUP_REG, MCA_MB_SETUP_DIS);
131
132 /* For each slot */
133 for (slot = 0; slot < MCA_MAX_SLOTS; slot++) {
134
135 /* Select the slot */
136 outb(MCA_ADAP_SETUP_REG, slot | MCA_ADAP_SET);
137 pos5 = inb(MCA_POS_REG(MCA_POS5));
138
139 /* If Adapter Check is low */
140 if ((pos5 & MCA_POS5_CHCK) == 0) {
141 retval++;
142
143 /* If Adapter Check Status is available */
144 if ((pos5 & MCA_POS5_CHCK_STAT) == 0) {
145 printf("MCA NMI: slot %d, POS6=0x%02x, POS7=0x%02x\n",
146 slot+1,
147 inb( MCA_POS_REG(MCA_POS6) ),
148 inb( MCA_POS_REG(MCA_POS7) ));
149 } else {
150 printf("MCA NMI: slot %d\n", slot+1);
151 }
152 }
153 /* Disable adapter setup */
154 outb(MCA_ADAP_SETUP_REG, MCA_ADAP_SETUP_DIS);
155 }
156
157 return (retval);
158 }
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