mca_machdep.c revision 130312
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 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: head/sys/i386/bios/mca_machdep.c 130312 2004-06-10 20:31:00Z jhb $"); 29 30#include <sys/param.h> 31#include <sys/systm.h> 32#include <sys/kernel.h> 33#include <vm/vm.h> 34#include <vm/vm_param.h> 35#include <vm/pmap.h> 36#include <machine/pmap.h> 37#include <machine/md_var.h> 38#include <machine/vm86.h> 39#include <machine/pc/bios.h> 40#include <machine/cpufunc.h> 41 42#include <dev/mca/mca_busreg.h> 43#include <i386/bios/mca_machdep.h> 44 45/* Global MCA bus flag */ 46int MCA_system = 0; 47 48/* System Configuration Block */ 49struct sys_config { 50 u_int16_t count; 51 u_int8_t model; 52 u_int8_t submodel; 53 u_int8_t bios_rev; 54 u_int8_t feature; 55#define FEATURE_RESV 0x01 /* Reserved */ 56#define FEATURE_MCABUS 0x02 /* MicroChannel Architecture */ 57#define FEATURE_EBDA 0x04 /* Extended BIOS data area allocated */ 58#define FEATURE_WAITEV 0x08 /* Wait for external event is supported */ 59#define FEATURE_KBDINT 0x10 /* Keyboard intercept called by Int 09h */ 60#define FEATURE_RTC 0x20 /* Real-time clock present */ 61#define FEATURE_IC2 0x40 /* Second interrupt chip present */ 62#define FEATURE_DMA3 0x80 /* DMA channel 3 used by hard disk BIOS */ 63 u_int8_t pad[3]; 64} __packed; 65 66/* Function Prototypes */ 67static void bios_mcabus_present (void *); 68SYSINIT(mca_present, SI_SUB_CPU, SI_ORDER_ANY, bios_mcabus_present, NULL); 69 70/* Functions */ 71static void 72bios_mcabus_present(void * dummy) 73{ 74 struct vm86frame vmf; 75 struct sys_config * scp; 76 vm_offset_t paddr; 77 78 bzero(&vmf, sizeof(struct vm86frame)); 79 80 vmf.vmf_ah = 0xc0; 81 if (vm86_intcall(0x15, &vmf)) { 82 if (bootverbose) { 83 printf("BIOS SDT: INT call failed.\n"); 84 } 85 return; 86 } 87 88 if ((vmf.vmf_ah != 0) && (vmf.vmf_flags & 0x01)) { 89 if (bootverbose) { 90 printf("BIOS SDT: Not supported. Not PS/2?\n"); 91 printf("BIOS SDT: AH 0x%02x, Flags 0x%04x\n", 92 vmf.vmf_ah, vmf.vmf_flags); 93 } 94 return; 95 } 96 97 paddr = vmf.vmf_es; 98 paddr = (paddr << 4) + vmf.vmf_bx; 99 scp = (struct sys_config *)BIOS_PADDRTOVADDR(paddr); 100 101 if (bootverbose) { 102 printf("BIOS SDT: model 0x%02x, submodel 0x%02x, bios_rev 0x%02x\n", 103 scp->model, scp->submodel, scp->bios_rev); 104 printf("BIOS SDT: features 0x%b\n", scp->feature, 105 "\20" 106 "\01RESV" 107 "\02MCABUS" 108 "\03EBDA" 109 "\04WAITEV" 110 "\05KBDINT" 111 "\06RTC" 112 "\07IC2" 113 "\08DMA3\n"); 114 } 115 116 MCA_system = ((scp->feature & FEATURE_MCABUS) ? 1 : 0); 117 118 if (MCA_system) 119 printf("MicroChannel Architecture System detected.\n"); 120 121 return; 122} 123 124int 125mca_bus_nmi (void) 126{ 127 int slot; 128 int retval = 0; 129 int pos5 = 0; 130 131 /* Disable motherboard setup */ 132 outb(MCA_MB_SETUP_REG, MCA_MB_SETUP_DIS); 133 134 /* For each slot */ 135 for (slot = 0; slot < MCA_MAX_SLOTS; slot++) { 136 137 /* Select the slot */ 138 outb(MCA_ADAP_SETUP_REG, slot | MCA_ADAP_SET); 139 pos5 = inb(MCA_POS_REG(MCA_POS5)); 140 141 /* If Adapter Check is low */ 142 if ((pos5 & MCA_POS5_CHCK) == 0) { 143 retval++; 144 145 /* If Adapter Check Status is available */ 146 if ((pos5 & MCA_POS5_CHCK_STAT) == 0) { 147 printf("MCA NMI: slot %d, POS6=0x%02x, POS7=0x%02x\n", 148 slot+1, 149 inb( MCA_POS_REG(MCA_POS6) ), 150 inb( MCA_POS_REG(MCA_POS7) )); 151 } else { 152 printf("MCA NMI: slot %d\n", slot+1); 153 } 154 } 155 /* Disable adapter setup */ 156 outb(MCA_ADAP_SETUP_REG, MCA_ADAP_SETUP_DIS); 157 } 158 159 return (retval); 160} 161