293 lines
7.5 KiB
C
293 lines
7.5 KiB
C
/*-
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* Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* PnP BIOS enumerator.
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*/
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#include <stand.h>
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#include <machine/stdarg.h>
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#include <bootstrap.h>
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#include <isapnp.h>
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#include <btxv86.h>
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static int biospnp_init(void);
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static void biospnp_enumerate(void);
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struct pnphandler biospnphandler =
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{
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"PnP BIOS",
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biospnp_enumerate
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};
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struct pnp_ICstructure
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{
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u_int8_t pnp_signature[4];
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u_int8_t pnp_version;
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u_int8_t pnp_length;
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u_int16_t pnp_BIOScontrol;
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u_int8_t pnp_checksum;
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u_int32_t pnp_eventflag;
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u_int16_t pnp_rmip;
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u_int16_t pnp_rmcs;
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u_int16_t pnp_pmip;
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u_int32_t pnp_pmcs;
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u_int8_t pnp_OEMdev[4];
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u_int16_t pnp_rmds;
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u_int32_t pnp_pmds;
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} __packed;
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struct pnp_devNode
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{
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u_int16_t dn_size;
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u_int8_t dn_handle;
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u_int8_t dn_id[4];
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u_int8_t dn_type[3];
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u_int16_t dn_attrib;
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u_int8_t dn_data[1];
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} __packed;
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struct pnp_isaConfiguration
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{
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u_int8_t ic_revision;
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u_int8_t ic_nCSN;
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u_int16_t ic_rdport;
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u_int16_t ic_reserved;
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} __packed;
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static struct pnp_ICstructure *pnp_Icheck = NULL;
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static u_int16_t pnp_NumNodes;
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static u_int16_t pnp_NodeSize;
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static void biospnp_scanresdata(struct pnpinfo *pi, struct pnp_devNode *dn);
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static int biospnp_call(int func, const char *fmt, ...);
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#define vsegofs(vptr) (((u_int32_t)VTOPSEG(vptr) << 16) + VTOPOFF(vptr))
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typedef void v86bios_t(u_int32_t, u_int32_t, u_int32_t, u_int32_t);
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v86bios_t *v86bios = (v86bios_t *)v86int;
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#define biospnp_f00(NumNodes, NodeSize) biospnp_call(0x00, "ll", NumNodes, NodeSize)
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#define biospnp_f01(Node, devNodeBuffer, Control) biospnp_call(0x01, "llw", Node, devNodeBuffer, Control)
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#define biospnp_f40(Configuration) biospnp_call(0x40, "l", Configuration)
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/* PnP BIOS return codes */
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#define PNP_SUCCESS 0x00
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#define PNP_FUNCTION_NOT_SUPPORTED 0x80
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/*
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* Initialisation: locate the PnP BIOS, test that we can call it.
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* Returns nonzero if the PnP BIOS is not usable on this system.
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*/
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static int
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biospnp_init(void)
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{
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struct pnp_isaConfiguration icfg;
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char *sigptr;
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int result;
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/* Search for the $PnP signature */
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pnp_Icheck = NULL;
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for (sigptr = PTOV(0xf0000); sigptr < PTOV(0xfffff); sigptr += 16)
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if (!bcmp(sigptr, "$PnP", 4)) {
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pnp_Icheck = (struct pnp_ICstructure *)sigptr;
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break;
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}
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/* No signature, no BIOS */
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if (pnp_Icheck == NULL)
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return(1);
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/*
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* Fetch the system table parameters as a test of the BIOS
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*/
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result = biospnp_f00(vsegofs(&pnp_NumNodes), vsegofs(&pnp_NodeSize));
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if (result != PNP_SUCCESS) {
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return(1);
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}
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/*
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* Look for the PnP ISA configuration table
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*/
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result = biospnp_f40(vsegofs(&icfg));
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switch (result) {
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case PNP_SUCCESS:
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/* If the BIOS found some PnP devices, take its hint for the read port */
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if ((icfg.ic_revision == 1) && (icfg.ic_nCSN > 0))
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isapnp_readport = icfg.ic_rdport;
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break;
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case PNP_FUNCTION_NOT_SUPPORTED:
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/* The BIOS says there is no ISA bus (should we trust that this works?) */
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printf("PnP BIOS claims no ISA bus\n");
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isapnp_readport = -1;
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break;
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}
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return(0);
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}
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static void
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biospnp_enumerate(void)
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{
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u_int8_t Node;
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struct pnp_devNode *devNodeBuffer;
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int result;
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struct pnpinfo *pi;
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int count;
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/* Init/check state */
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if (biospnp_init())
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return;
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devNodeBuffer = (struct pnp_devNode *)alloca(pnp_NodeSize);
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Node = 0;
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count = 1000;
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while((Node != 0xff) && (count-- > 0)) {
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result = biospnp_f01(vsegofs(&Node), vsegofs(devNodeBuffer), 0x1);
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if (result != PNP_SUCCESS) {
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printf("PnP BIOS node %d: error 0x%x\n", Node, result);
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} else {
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pi = pnp_allocinfo();
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pnp_addident(pi, pnp_eisaformat(devNodeBuffer->dn_id));
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biospnp_scanresdata(pi, devNodeBuffer);
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pnp_addinfo(pi);
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}
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}
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}
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/*
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* Scan the resource data in the node's data area for compatible device IDs
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* and descriptions.
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*/
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static void
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biospnp_scanresdata(struct pnpinfo *pi, struct pnp_devNode *dn)
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{
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u_int tag, i, rlen, dlen;
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u_int8_t *p;
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char *str;
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p = dn->dn_data; /* point to resource data */
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dlen = dn->dn_size - (p - (u_int8_t *)dn); /* length of resource data */
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for (i = 0; i < dlen; i+= rlen) {
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tag = p[i];
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i++;
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if (PNP_RES_TYPE(tag) == 0) {
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rlen = PNP_SRES_LEN(tag);
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/* small resource */
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switch (PNP_SRES_NUM(tag)) {
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case COMP_DEVICE_ID:
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/* got a compatible device ID */
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pnp_addident(pi, pnp_eisaformat(p + i));
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break;
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case END_TAG:
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return;
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}
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} else {
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/* large resource */
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rlen = *(u_int16_t *)(p + i);
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i += sizeof(u_int16_t);
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switch(PNP_LRES_NUM(tag)) {
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case ID_STRING_ANSI:
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str = malloc(rlen + 1);
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bcopy(p + i, str, rlen);
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str[rlen] = 0;
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if (pi->pi_desc == NULL) {
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pi->pi_desc = str;
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} else {
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free(str);
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}
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break;
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}
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}
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}
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}
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/*
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* Make a 16-bit realmode PnP BIOS call.
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*
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* The first argument passed is the function number, the last is the
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* BIOS data segment selector. Intermediate arguments may be 16 or
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* 32 bytes in length, and are described by the format string.
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*
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* Arguments to the BIOS functions must be packed on the stack, hence
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* this evil.
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*/
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static int
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biospnp_call(int func, const char *fmt, ...)
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{
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va_list ap;
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const char *p;
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u_int8_t *argp;
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u_int32_t args[4];
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u_int32_t i;
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/* function number first */
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argp = (u_int8_t *)args;
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*(u_int16_t *)argp = func;
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argp += sizeof(u_int16_t);
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/* take args according to format */
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va_start(ap, fmt);
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for (p = fmt; *p != 0; p++) {
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switch(*p) {
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case 'w':
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i = va_arg(ap, u_int);
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*(u_int16_t *)argp = i;
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argp += sizeof(u_int16_t);
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break;
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case 'l':
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i = va_arg(ap, u_int32_t);
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*(u_int32_t *)argp = i;
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argp += sizeof(u_int32_t);
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break;
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}
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}
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va_end(ap);
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/* BIOS segment last */
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*(u_int16_t *)argp = pnp_Icheck->pnp_rmds;
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argp += sizeof(u_int16_t);
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/* prepare for call */
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v86.ctl = V86_ADDR | V86_CALLF;
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v86.addr = ((u_int32_t)pnp_Icheck->pnp_rmcs << 16) + pnp_Icheck->pnp_rmip;
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/* call with packed stack and return */
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v86bios(args[0], args[1], args[2], args[3]);
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return(v86.eax & 0xffff);
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}
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