2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
26 * $FreeBSD: src/sys/boot/i386/libi386/biospnp.c,v 1.9 2003/08/25 23:28:31 obrien Exp $
27 * $DragonFly: src/sys/boot/pc32/libi386/biospnp.c,v 1.5 2008/10/03 19:56:10 swildner Exp $
31 * PnP BIOS enumerator.
35 #include <machine/stdarg.h>
36 #include <bootstrap.h>
40 static int biospnp_init(void);
41 static void biospnp_enumerate(void);
43 struct pnphandler biospnphandler =
49 struct pnp_ICstructure
51 u_int8_t pnp_signature[4];
54 u_int16_t pnp_BIOScontrol;
55 u_int8_t pnp_checksum;
56 u_int32_t pnp_eventflag;
61 u_int8_t pnp_OEMdev[4];
76 struct pnp_isaConfiguration
81 u_int16_t ic_reserved;
84 static struct pnp_ICstructure *pnp_Icheck = NULL;
85 static u_int16_t pnp_NumNodes;
86 static u_int16_t pnp_NodeSize;
88 static void biospnp_scanresdata(struct pnpinfo *pi, struct pnp_devNode *dn);
89 static int biospnp_call(int func, const char *fmt, ...);
91 #define vsegofs(vptr) (((u_int32_t)VTOPSEG(vptr) << 16) + VTOPOFF(vptr))
93 typedef void v86bios_t(u_int32_t, u_int32_t, u_int32_t, u_int32_t);
94 v86bios_t *v86bios = (v86bios_t *)v86int;
96 #define biospnp_f00(NumNodes, NodeSize) biospnp_call(0x00, "ll", NumNodes, NodeSize)
97 #define biospnp_f01(Node, devNodeBuffer, Control) biospnp_call(0x01, "llw", Node, devNodeBuffer, Control)
98 #define biospnp_f40(Configuration) biospnp_call(0x40, "l", Configuration)
100 /* PnP BIOS return codes */
101 #define PNP_SUCCESS 0x00
102 #define PNP_FUNCTION_NOT_SUPPORTED 0x80
105 * Initialisation: locate the PnP BIOS, test that we can call it.
106 * Returns nonzero if the PnP BIOS is not usable on this system.
111 struct pnp_isaConfiguration icfg;
115 /* Search for the $PnP signature */
117 for (sigptr = PTOV(0xf0000); sigptr < PTOV(0xfffff); sigptr += 16)
118 if (!bcmp(sigptr, "$PnP", 4)) {
119 pnp_Icheck = (struct pnp_ICstructure *)sigptr;
123 /* No signature, no BIOS */
124 if (pnp_Icheck == NULL)
128 * Fetch the system table parameters as a test of the BIOS
130 result = biospnp_f00(vsegofs(&pnp_NumNodes), vsegofs(&pnp_NodeSize));
131 if (result != PNP_SUCCESS) {
136 * Look for the PnP ISA configuration table
138 result = biospnp_f40(vsegofs(&icfg));
141 /* If the BIOS found some PnP devices, take its hint for the read port */
142 if ((icfg.ic_revision == 1) && (icfg.ic_nCSN > 0))
143 isapnp_readport = icfg.ic_rdport;
145 case PNP_FUNCTION_NOT_SUPPORTED:
146 /* The BIOS says there is no ISA bus (should we trust that this works?) */
147 printf("PnP BIOS claims no ISA bus\n");
148 isapnp_readport = -1;
155 biospnp_enumerate(void)
158 struct pnp_devNode *devNodeBuffer;
163 /* Init/check state */
167 devNodeBuffer = (struct pnp_devNode *)malloc(pnp_NodeSize);
170 while((Node != 0xff) && (count-- > 0)) {
171 result = biospnp_f01(vsegofs(&Node), vsegofs(devNodeBuffer), 0x1);
172 if (result != PNP_SUCCESS) {
173 printf("PnP BIOS node %d: error 0x%x\n", Node, result);
175 pi = pnp_allocinfo();
176 pnp_addident(pi, pnp_eisaformat(devNodeBuffer->dn_id));
177 biospnp_scanresdata(pi, devNodeBuffer);
184 * Scan the resource data in the node's data area for compatible device IDs
188 biospnp_scanresdata(struct pnpinfo *pi, struct pnp_devNode *dn)
190 u_int tag, i, rlen, dlen;
194 p = dn->dn_data; /* point to resource data */
195 dlen = dn->dn_size - (p - (u_int8_t *)dn); /* length of resource data */
197 for (i = 0; i < dlen; i+= rlen) {
200 if (PNP_RES_TYPE(tag) == 0) {
201 rlen = PNP_SRES_LEN(tag);
203 switch (PNP_SRES_NUM(tag)) {
206 /* got a compatible device ID */
207 pnp_addident(pi, pnp_eisaformat(p + i));
215 rlen = *(u_int16_t *)(p + i);
216 i += sizeof(u_int16_t);
218 switch(PNP_LRES_NUM(tag)) {
221 str = malloc(rlen + 1);
222 bcopy(p + i, str, rlen);
224 if (pi->pi_desc == NULL) {
237 * Make a 16-bit realmode PnP BIOS call.
239 * The first argument passed is the function number, the last is the
240 * BIOS data segment selector. Intermediate arguments may be 16 or
241 * 32 bytes in length, and are described by the format string.
243 * Arguments to the BIOS functions must be packed on the stack, hence
247 biospnp_call(int func, const char *fmt, ...)
255 /* function number first */
256 argp = (u_int8_t *)args;
257 *(u_int16_t *)argp = func;
258 argp += sizeof(u_int16_t);
260 /* take args according to format */
262 for (p = fmt; *p != 0; p++) {
266 i = __va_arg(ap, u_int);
267 *(u_int16_t *)argp = i;
268 argp += sizeof(u_int16_t);
272 i = __va_arg(ap, u_int32_t);
273 *(u_int32_t *)argp = i;
274 argp += sizeof(u_int32_t);
279 /* BIOS segment last */
280 *(u_int16_t *)argp = pnp_Icheck->pnp_rmds;
281 argp += sizeof(u_int16_t);
283 /* prepare for call */
284 v86.ctl = V86_ADDR | V86_CALLF;
285 v86.addr = ((u_int32_t)pnp_Icheck->pnp_rmcs << 16) + pnp_Icheck->pnp_rmip;
287 /* call with packed stack and return */
288 v86bios(args[0], args[1], args[2], args[3]);
289 return(v86.eax & 0xffff);