Find out the presence of MCA bus via bioscall(9).
g/c some unneeded stuff, make comments more accurate.
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jdolecek
parent
8aa43b5a54
commit
0d6051b7f7
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@ -1,4 +1,4 @@
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/* $NetBSD: mca_machdep.c,v 1.6 2001/04/22 11:52:18 jdolecek Exp $ */
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/* $NetBSD: mca_machdep.c,v 1.7 2001/05/02 13:18:34 jdolecek Exp $ */
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/*-
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* Copyright (c) 2000 The NetBSD Foundation, Inc.
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@ -63,6 +63,25 @@
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#include "isa.h"
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#include "opt_mcaverbose.h"
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/* System Configuration Block - this info is returned by the BIOS call */
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struct bios_config {
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u_int16_t count;
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u_int8_t model;
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u_int8_t submodel;
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u_int8_t bios_rev;
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u_int8_t feature1;
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#define FEATURE_MCAISA 0x01 /* Machine contains both MCA and ISA bus */
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#define FEATURE_MCABUS 0x02 /* Machine has MCA bus instead of ISA */
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#define FEATURE_EBDA 0x04 /* Extended BIOS data area allocated */
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#define FEATURE_WAITEV 0x08 /* Wait for external event is supported */
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#define FEATURE_KBDINT 0x10 /* Keyboard intercept called by Int 09h */
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#define FEATURE_RTC 0x20 /* Real-time clock present */
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#define FEATURE_IC2 0x40 /* Second interrupt chip present */
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#define FEATURE_DMA3 0x80 /* DMA channel 3 used by hard disk BIOS */
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u_int8_t pad[10];
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} __attribute__ ((packed));
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struct i386_bus_dma_tag mca_bus_dma_tag = {
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NULL, /* _cookie */
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_bus_dmamap_create,
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@ -81,8 +100,7 @@ struct i386_bus_dma_tag mca_bus_dma_tag = {
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};
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/* setup by mca_busprobe() */
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int MCA_system = 1; /* XXX force MCA for now */
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int bios_features = 1;
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int MCA_system = 0; /* Updated in mca_busprobe() if appropriate. */
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void
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mca_attach_hook(parent, self, mba)
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@ -214,70 +232,58 @@ mca_nmi()
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return(0);
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}
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/*
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* We can obtain the information about MCA bus presence via
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* GET CONFIGURATION BIOS call - int 0x15, function 0xc0.
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* The call returns a pointer to memory place with the configuration block
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* in es:bx (on AT-compatible, e.g. all we care about, computers).
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*
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* Configuration block contains block length (2 bytes), model
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* number (1 byte), submodel number (1 byte), BIOS revision
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* (1 byte) and up to 5 feature bytes. We only care about
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* first feature byte.
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*/
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void
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mca_busprobe()
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{
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/* According to Linux's linux/arch/i386/boot/setup.S,
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* we can get the extra BIOS information via int 0x15,
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* ah == 0xc0. The extra information is stored on
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* es:bx; it contains two bytes of length, then byte
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* of machine id, byte of machine submodel, byte of BIOS
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* revision number and byte of feature info.
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*/
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/*
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* Scott Telford's code used
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* ((inb(MCA_ADAP_SETUP_REG) & (MCA_ADAP_SET | MCA_ADAP_CHR)) == 0)
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* - somewhat dubious, but good enough.
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*/
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#if notyet
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char buf[10];
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/*
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* Following has been taken from FreeBSD, for now just for
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* documentation purposes
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*/
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struct bioscallregs regs;
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struct sys_config *scp;
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struct bios_config *scp;
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paddr_t paddr;
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char buf[50];
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memset(®s, 0, sizeof(regs));
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regs.AX_HI = 0xc0;
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regs.AH = 0xc0;
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bioscall(0x15, ®s);
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if ((regs.EFLAGS & PSL_C)
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|| (regs.AX_HI != 0 && (regs.FLAGS & PSL_AC)))
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{
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#ifdef MCAVERBOSE
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printf("BIOS SDT: Not supported. Not PS/2?\n");
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if ((regs.EFLAGS & PSL_C) || regs.AH != 0) {
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#ifdef DEBUG
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printf("BIOS CFG: Not supported. Not AT-compatible?\n");
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#endif
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return;
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}
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paddr = (regs.ES << 4) + regs.BX;
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scp = (struct sys_config *)ISA_HOLE_VADDR(paddr);
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printf("BIOS SDT: model 0x%x, submodel 0x%x, BIOS rev. 0x%x\n",
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paddr = (regs.ES << 4) + regs.BX;
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scp = (struct bios_config *)ISA_HOLE_VADDR(paddr);
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#if 1 /* MCAVERBOSE */
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printf("BIOS CFG: Model %#x, Submodel %#x, Revision %#x\n",
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scp->model, scp->submodel, scp->bios_rev);
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#ifdef MCAVERBOSE
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bitmask_snprintf(scp->feature,
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bitmask_snprintf(scp->feature1,
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"\20"
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"\01RESV"
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"\01MCABUS+ISABUS"
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"\02MCABUS"
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"\03EBDA"
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"\04WAITEV"
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"\05KBDINT"
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"\06RTC"
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"\07IC2"
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"\010DMA3\n",
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"\010DMA3USED\n",
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buf, sizeof(buf));
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printf("BIOS SDT: features 0x%s\n", buf);
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printf("BIOS CFG: features 0x%s\n", buf);
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#endif
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bios_features = scp->feature;
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MCA_system = (bios_features & FEATURE_MCABUS) ? 1 : 0;
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#endif /* 0 */
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MCA_system = (scp->feature1 & FEATURE_MCABUS) ? 1 : 0;
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}
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#define PORT_DISKLED 0x92
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