1 /* 2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org> 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 29 /* 30 * PnP BIOS enumerator. 31 */ 32 33 #include <stand.h> 34 #include <machine/stdarg.h> 35 #include <bootstrap.h> 36 #include <isapnp.h> 37 #include <btxv86.h> 38 39 40 static int biospnp_init(void); 41 static void biospnp_enumerate(void); 42 43 struct pnphandler biospnphandler = 44 { 45 "PnP BIOS", 46 biospnp_enumerate 47 }; 48 49 struct pnp_ICstructure 50 { 51 u_int8_t pnp_signature[4]; 52 u_int8_t pnp_version; 53 u_int8_t pnp_length; 54 u_int16_t pnp_BIOScontrol; 55 u_int8_t pnp_checksum; 56 u_int32_t pnp_eventflag; 57 u_int16_t pnp_rmip; 58 u_int16_t pnp_rmcs; 59 u_int16_t pnp_pmip; 60 u_int32_t pnp_pmcs; 61 u_int8_t pnp_OEMdev[4]; 62 u_int16_t pnp_rmds; 63 u_int32_t pnp_pmds; 64 } __packed; 65 66 struct pnp_devNode 67 { 68 u_int16_t dn_size; 69 u_int8_t dn_handle; 70 u_int8_t dn_id[4]; 71 u_int8_t dn_type[3]; 72 u_int16_t dn_attrib; 73 u_int8_t dn_data[1]; 74 } __packed; 75 76 struct pnp_isaConfiguration 77 { 78 u_int8_t ic_revision; 79 u_int8_t ic_nCSN; 80 u_int16_t ic_rdport; 81 u_int16_t ic_reserved; 82 } __packed; 83 84 static struct pnp_ICstructure *pnp_Icheck = NULL; 85 static u_int16_t pnp_NumNodes; 86 static u_int16_t pnp_NodeSize; 87 88 static void biospnp_scanresdata(struct pnpinfo *pi, struct pnp_devNode *dn); 89 static int biospnp_call(int func, const char *fmt, ...); 90 91 #define vsegofs(vptr) (((u_int32_t)VTOPSEG(vptr) << 16) + VTOPOFF(vptr)) 92 93 typedef void v86bios_t(u_int32_t, u_int32_t, u_int32_t, u_int32_t); 94 v86bios_t *v86bios = (v86bios_t *)v86int; 95 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) 99 100 /* PnP BIOS return codes */ 101 #define PNP_SUCCESS 0x00 102 #define PNP_FUNCTION_NOT_SUPPORTED 0x80 103 104 /* 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. 107 */ 108 static int 109 biospnp_init(void) 110 { 111 struct pnp_isaConfiguration icfg; 112 char *sigptr; 113 int result; 114 115 /* Search for the $PnP signature */ 116 pnp_Icheck = NULL; 117 for (sigptr = PTOV(0xf0000); sigptr < PTOV(0xfffff); sigptr += 16) 118 if (!bcmp(sigptr, "$PnP", 4)) { 119 pnp_Icheck = (struct pnp_ICstructure *)sigptr; 120 break; 121 } 122 123 /* No signature, no BIOS */ 124 if (pnp_Icheck == NULL) 125 return(1); 126 127 /* 128 * Fetch the system table parameters as a test of the BIOS 129 */ 130 result = biospnp_f00(vsegofs(&pnp_NumNodes), vsegofs(&pnp_NodeSize)); 131 if (result != PNP_SUCCESS) { 132 return(1); 133 } 134 135 /* 136 * Look for the PnP ISA configuration table 137 */ 138 result = biospnp_f40(vsegofs(&icfg)); 139 switch (result) { 140 case PNP_SUCCESS: 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; 144 break; 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; 149 break; 150 } 151 return(0); 152 } 153 154 static void 155 biospnp_enumerate(void) 156 { 157 u_int8_t Node; 158 struct pnp_devNode *devNodeBuffer; 159 int result; 160 struct pnpinfo *pi; 161 int count; 162 163 /* Init/check state */ 164 if (biospnp_init()) 165 return; 166 167 devNodeBuffer = (struct pnp_devNode *)alloca(pnp_NodeSize); 168 Node = 0; 169 count = 1000; 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); 174 } else { 175 pi = pnp_allocinfo(); 176 pnp_addident(pi, pnp_eisaformat(devNodeBuffer->dn_id)); 177 biospnp_scanresdata(pi, devNodeBuffer); 178 pnp_addinfo(pi); 179 } 180 } 181 } 182 183 /* 184 * Scan the resource data in the node's data area for compatible device IDs 185 * and descriptions. 186 */ 187 static void 188 biospnp_scanresdata(struct pnpinfo *pi, struct pnp_devNode *dn) 189 { 190 u_int tag, i, rlen, dlen; 191 u_int8_t *p; 192 char *str; 193 194 p = dn->dn_data; /* point to resource data */ 195 dlen = dn->dn_size - (p - (u_int8_t *)dn); /* length of resource data */ 196 197 for (i = 0; i < dlen; i+= rlen) { 198 tag = p[i]; 199 i++; 200 if (PNP_RES_TYPE(tag) == 0) { 201 rlen = PNP_SRES_LEN(tag); 202 /* small resource */ 203 switch (PNP_SRES_NUM(tag)) { 204 205 case COMP_DEVICE_ID: 206 /* got a compatible device ID */ 207 pnp_addident(pi, pnp_eisaformat(p + i)); 208 break; 209 210 case END_TAG: 211 return; 212 } 213 } else { 214 /* large resource */ 215 rlen = *(u_int16_t *)(p + i); 216 i += sizeof(u_int16_t); 217 218 switch(PNP_LRES_NUM(tag)) { 219 220 case ID_STRING_ANSI: 221 str = malloc(rlen + 1); 222 bcopy(p + i, str, rlen); 223 str[rlen] = 0; 224 if (pi->pi_desc == NULL) { 225 pi->pi_desc = str; 226 } else { 227 free(str); 228 } 229 break; 230 } 231 } 232 } 233 } 234 235 236 /* 237 * Make a 16-bit realmode PnP BIOS call. 238 * 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. 242 * 243 * Arguments to the BIOS functions must be packed on the stack, hence 244 * this evil. 245 */ 246 static int 247 biospnp_call(int func, const char *fmt, ...) 248 { 249 va_list ap; 250 const char *p; 251 uint8_t *argp; 252 uint16_t int16; 253 uint32_t args[4]; 254 uint32_t i; 255 256 /* function number first */ 257 argp = (uint8_t *)args; 258 int16 = func; 259 bcopy(&int16, argp, sizeof (int16)); 260 argp += sizeof(uint16_t); 261 262 /* take args according to format */ 263 va_start(ap, fmt); 264 for (p = fmt; *p != 0; p++) { 265 switch(*p) { 266 case 'w': 267 i = va_arg(ap, uint32_t); 268 int16 = i; 269 bcopy(&int16, argp, sizeof (int16)); 270 argp += sizeof (uint16_t); 271 break; 272 273 case 'l': 274 i = va_arg(ap, uint32_t); 275 bcopy(&i, argp, sizeof (i)); 276 argp += sizeof (uint32_t); 277 break; 278 } 279 } 280 va_end(ap); 281 282 /* BIOS segment last */ 283 int16 = pnp_Icheck->pnp_rmds; 284 bcopy(&int16, argp, sizeof (int16)); 285 argp += sizeof(uint16_t); 286 287 /* prepare for call */ 288 v86.ctl = V86_ADDR | V86_CALLF; 289 v86.addr = ((uint32_t)pnp_Icheck->pnp_rmcs << 16) + pnp_Icheck->pnp_rmip; 290 291 /* call with packed stack and return */ 292 v86bios(args[0], args[1], args[2], args[3]); 293 return (v86.eax & 0xffff); 294 } 295