1 /*-
2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
3 * All rights reserved.
4 *
5 * Copyright (c) 2016 Netflix, Inc.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD: stable/12/stand/i386/libi386/biospci.c 351913 2019-09-05 23:27:59Z imp $");
31
32 /*
33 * PnP enumerator using the PCI BIOS.
34 */
35
36 #include <stand.h>
37 #include <machine/stdarg.h>
38 #include <bootstrap.h>
39 #include <isapnp.h>
40 #include <btxv86.h>
41 #include "libi386.h"
42
43 /*
44 * Stupid PCI BIOS interface doesn't let you simply enumerate everything
45 * that's there, instead you have to ask it if it has something.
46 *
47 * So we have to scan by class code, subclass code and sometimes programming
48 * interface.
49 */
50
51 struct pci_progif
52 {
53 int pi_code;
54 const char *pi_name;
55 };
56
57 static struct pci_progif progif_null[] = {
58 {0x0, NULL},
59 {-1, NULL}
60 };
61
62 static struct pci_progif progif_display[] = {
63 {0x0, "VGA"},
64 {0x1, "8514"},
65 {-1, NULL}
66 };
67
68 static struct pci_progif progif_ide[] = {
69 {0x00, NULL},
70 {0x01, NULL},
71 {0x02, NULL},
72 {0x03, NULL},
73 {0x04, NULL},
74 {0x05, NULL},
75 {0x06, NULL},
76 {0x07, NULL},
77 {0x08, NULL},
78 {0x09, NULL},
79 {0x0a, NULL},
80 {0x0b, NULL},
81 {0x0c, NULL},
82 {0x0d, NULL},
83 {0x0e, NULL},
84 {0x0f, NULL},
85 {0x80, NULL},
86 {0x81, NULL},
87 {0x82, NULL},
88 {0x83, NULL},
89 {0x84, NULL},
90 {0x85, NULL},
91 {0x86, NULL},
92 {0x87, NULL},
93 {0x88, NULL},
94 {0x89, NULL},
95 {0x8a, NULL},
96 {0x8b, NULL},
97 {0x8c, NULL},
98 {0x8d, NULL},
99 {0x8e, NULL},
100 {0x8f, NULL},
101 {-1, NULL}
102 };
103
104 static struct pci_progif progif_serial[] = {
105 {0x0, "8250"},
106 {0x1, "16450"},
107 {0x2, "16550"},
108 {-1, NULL}
109 };
110
111 static struct pci_progif progif_parallel[] = {
112 {0x0, "Standard"},
113 {0x1, "Bidirectional"},
114 {0x2, "ECP"},
115 {-1, NULL}
116 };
117
118 static struct pci_progif progif_firewire[] = {
119 {0x10, "OHCI"},
120 {-1, NULL}
121 };
122
123 struct pci_subclass
124 {
125 int ps_subclass;
126 const char *ps_name;
127 struct pci_progif *ps_progif; /* if set, use for programming interface value(s) */
128 };
129
130 static struct pci_subclass subclass_old[] = {
131 {0x0, "Old non-VGA", progif_null},
132 {0x1, "Old VGA", progif_null},
133 {-1, NULL, NULL}
134 };
135
136 static struct pci_subclass subclass_mass[] = {
137 {0x0, "SCSI", progif_null},
138 {0x1, "IDE", progif_ide},
139 {0x2, "Floppy disk", progif_null},
140 {0x3, "IPI", progif_null},
141 {0x4, "RAID", progif_null},
142 {0x80, "mass storage", progif_null},
143 {-1, NULL, NULL}
144 };
145
146 static struct pci_subclass subclass_net[] = {
147 {0x0, "Ethernet", progif_null},
148 {0x1, "Token ring", progif_null},
149 {0x2, "FDDI", progif_null},
150 {0x3, "ATM", progif_null},
151 {0x80, "network", progif_null},
152 {-1, NULL, NULL}
153 };
154
155 static struct pci_subclass subclass_display[] = {
156 {0x0, NULL, progif_display},
157 {0x1, "XGA", progif_null},
158 {0x80, "other", progif_null},
159 {-1, NULL, NULL}
160 };
161
162 static struct pci_subclass subclass_comms[] = {
163 {0x0, "serial", progif_serial},
164 {0x1, "parallel", progif_parallel},
165 {0x80, "communications", progif_null},
166 {-1, NULL, NULL}
167 };
168
169 static struct pci_subclass subclass_serial[] = {
170 {0x0, "FireWire", progif_firewire},
171 {0x1, "ACCESS.bus", progif_null},
172 {0x2, "SSA", progif_null},
173 {0x3, "USB", progif_null},
174 {0x4, "Fibrechannel", progif_null},
175 {-1, NULL, NULL}
176 };
177
178 static struct pci_class
179 {
180 int pc_class;
181 const char *pc_name;
182 struct pci_subclass *pc_subclass;
183 } pci_classes[] = {
184 {0x0, "device", subclass_old},
185 {0x1, "controller", subclass_mass},
186 {0x2, "controller", subclass_net},
187 {0x3, "display", subclass_display},
188 {0x7, "controller", subclass_comms},
189 {0xc, "controller", subclass_serial},
190 {-1, NULL, NULL}
191 };
192
193 static void biospci_enumerate(void);
194 static void biospci_addinfo(int devid, struct pci_class *pc, struct pci_subclass *psc, struct pci_progif *ppi);
195
196 struct pnphandler biospcihandler =
197 {
198 "PCI BIOS",
199 biospci_enumerate
200 };
201 static int biospci_version;
202
203 #define PCI_BIOS_PRESENT 0xb101
204 #define FIND_PCI_DEVICE 0xb102
205 #define FIND_PCI_CLASS_CODE 0xb103
206 #define GENERATE_SPECIAL_CYCLE 0xb106
207 #define READ_CONFIG_BYTE 0xb108
208 #define READ_CONFIG_WORD 0xb109
209 #define READ_CONFIG_DWORD 0xb10a
210 #define WRITE_CONFIG_BYTE 0xb10b
211 #define WRITE_CONFIG_WORD 0xb10c
212 #define WRITE_CONFIG_DWORD 0xb10d
213 #define GET_IRQ_ROUTING_OPTIONS 0xb10e
214 #define SET_PCI_IRQ 0xb10f
215
216 #define PCI_INT 0x1a
217
218 #define PCI_SIGNATURE 0x20494350 /* AKA "PCI " */
219
220 void
biospci_detect(void)221 biospci_detect(void)
222 {
223 uint16_t version, hwcap, maxbus;
224 char buf[24];
225
226 /* Find the PCI BIOS */
227 v86.ctl = V86_FLAGS;
228 v86.addr = PCI_INT;
229 v86.eax = PCI_BIOS_PRESENT;
230 v86.edi = 0x0;
231 v86int();
232
233 /* Check for OK response */
234 if (V86_CY(v86.efl) || ((v86.eax & 0xff00) != 0) ||
235 (v86.edx != PCI_SIGNATURE))
236 return;
237
238 version = v86.ebx & 0xffff;
239 hwcap = v86.eax & 0xff;
240 maxbus = v86.ecx & 0xff;
241 #if 0
242 printf("PCI BIOS %d.%d%s%s maxbus %d\n",
243 bcd2bin((version >> 8) & 0xf), bcd2bin(version & 0xf),
244 (hwcap & 1) ? " config1" : "", (hwcap & 2) ? " config2" : "",
245 maxbus);
246 #endif
247 sprintf(buf, "%d", bcd2bin((version >> 8) & 0xf));
248 setenv("pcibios.major", buf, 1);
249 sprintf(buf, "%d", bcd2bin(version & 0xf));
250 setenv("pcibios.minor", buf, 1);
251 sprintf(buf, "%d", !!(hwcap & 1));
252 setenv("pcibios.config1", buf, 1);
253 sprintf(buf, "%d", !!(hwcap & 2));
254 setenv("pcibios.config2", buf, 1);
255 sprintf(buf, "%d", maxbus);
256 setenv("pcibios.maxbus", buf, 1);
257 biospci_version = bcd2bin((version >> 8) & 0xf) * 10 + bcd2bin(version & 0xf);
258 }
259
260 static void
biospci_enumerate(void)261 biospci_enumerate(void)
262 {
263 int device_index, err;
264 uint32_t locator, devid;
265 struct pci_class *pc;
266 struct pci_subclass *psc;
267 struct pci_progif *ppi;
268
269 /* Iterate over known classes */
270 for (pc = pci_classes; pc->pc_class >= 0; pc++) {
271 /* Iterate over subclasses */
272 for (psc = pc->pc_subclass; psc->ps_subclass >= 0; psc++) {
273 /* Iterate over programming interfaces */
274 for (ppi = psc->ps_progif; ppi->pi_code >= 0; ppi++) {
275
276 /* Scan for matches */
277 for (device_index = 0; ; device_index++) {
278 /* Look for a match */
279 err = biospci_find_devclass((pc->pc_class << 16)
280 + (psc->ps_subclass << 8) + ppi->pi_code,
281 device_index, &locator);
282 if (err != 0)
283 break;
284
285 /* Read the device identifier from the nominated device */
286 err = biospci_read_config(locator, 0, BIOSPCI_32BITS, &devid);
287 if (err != 0)
288 break;
289
290 /* We have the device ID, create a PnP object and save everything */
291 biospci_addinfo(devid, pc, psc, ppi);
292 }
293 }
294 }
295 }
296 }
297
298 static void
biospci_addinfo(int devid,struct pci_class * pc,struct pci_subclass * psc,struct pci_progif * ppi)299 biospci_addinfo(int devid, struct pci_class *pc, struct pci_subclass *psc, struct pci_progif *ppi)
300 {
301 struct pnpinfo *pi;
302 char desc[80];
303
304
305 /* build the description */
306 desc[0] = 0;
307 if (ppi->pi_name != NULL) {
308 strcat(desc, ppi->pi_name);
309 strcat(desc, " ");
310 }
311 if (psc->ps_name != NULL) {
312 strcat(desc, psc->ps_name);
313 strcat(desc, " ");
314 }
315 if (pc->pc_name != NULL)
316 strcat(desc, pc->pc_name);
317
318 pi = pnp_allocinfo();
319 pi->pi_desc = strdup(desc);
320 sprintf(desc,"0x%08x", devid);
321 pnp_addident(pi, desc);
322 pnp_addinfo(pi);
323 }
324
325 int
biospci_find_devclass(uint32_t class,int index,uint32_t * locator)326 biospci_find_devclass(uint32_t class, int index, uint32_t *locator)
327 {
328 v86.ctl = V86_FLAGS;
329 v86.addr = PCI_INT;
330 v86.eax = FIND_PCI_CLASS_CODE;
331 v86.ecx = class;
332 v86.esi = index;
333 v86int();
334
335 /* error */
336 if (V86_CY(v86.efl) || (v86.eax & 0xff00))
337 return (-1);
338
339 *locator = v86.ebx;
340 return (0);
341 }
342
343 static int
biospci_find_device(uint32_t devid,int index,uint32_t * locator)344 biospci_find_device(uint32_t devid, int index, uint32_t *locator)
345 {
346 v86.ctl = V86_FLAGS;
347 v86.addr = PCI_INT;
348 v86.eax = FIND_PCI_DEVICE;
349 v86.edx = devid & 0xffff; /* EDX - Vendor ID */
350 v86.ecx = (devid >> 16) & 0xffff; /* ECX - Device ID */
351 v86.esi = index;
352 v86int();
353
354 /* error */
355 if (V86_CY(v86.efl) || (v86.eax & 0xff00))
356 return (-1);
357
358 *locator = v86.ebx;
359 return (0);
360 }
361 /*
362 * Configuration space access methods.
363 * width = 0(byte), 1(word) or 2(dword).
364 */
365 int
biospci_write_config(uint32_t locator,int offset,int width,uint32_t val)366 biospci_write_config(uint32_t locator, int offset, int width, uint32_t val)
367 {
368 v86.ctl = V86_FLAGS;
369 v86.addr = PCI_INT;
370 v86.eax = WRITE_CONFIG_BYTE + width;
371 v86.ebx = locator;
372 v86.edi = offset;
373 v86.ecx = val;
374 v86int();
375
376 /* error */
377 if (V86_CY(v86.efl) || (v86.eax & 0xff00))
378 return (-1);
379
380 return(0);
381 }
382
383 int
biospci_read_config(uint32_t locator,int offset,int width,uint32_t * val)384 biospci_read_config(uint32_t locator, int offset, int width, uint32_t *val)
385 {
386 v86.ctl = V86_FLAGS;
387 v86.addr = PCI_INT;
388 v86.eax = READ_CONFIG_BYTE + width;
389 v86.ebx = locator;
390 v86.edi = offset;
391 v86int();
392
393 /* error */
394 if (V86_CY(v86.efl) || (v86.eax & 0xff00))
395 return (-1);
396
397 *val = v86.ecx;
398 return (0);
399 }
400
401 uint32_t
biospci_locator(int8_t bus,uint8_t device,uint8_t function)402 biospci_locator(int8_t bus, uint8_t device, uint8_t function)
403 {
404
405 return ((bus << 8) | ((device & 0x1f) << 3) | (function & 0x7));
406 }
407