1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25
26 #include <sys/types.h>
27 #include <sys/param.h>
28 #include <sys/controlregs.h>
29 #include <sys/bootconf.h>
30 #include <sys/bootvfs.h>
31 #include <sys/bootregs.h>
32 #include <sys/bootconf.h>
33 #include <sys/conf.h>
34 #include <sys/promif.h>
35 #include <sys/ddi.h>
36 #include <sys/sunddi.h>
37 #include <sys/sunndi.h>
38 #include <sys/biosdisk.h>
39 #include <sys/psw.h>
40 #if defined(__xpv)
41 #include <sys/hypervisor.h>
42 #endif
43
44 extern int prom_debug;
45
46 /* hard code realmode memory address for now */
47 #define BIOS_RES_BUFFER_ADDR 0x7000
48
49 #define BIOSDEV_NUM 8
50 #define STARTING_DRVNUM 0x80
51 #define FP_OFF(fp) (((uintptr_t)(fp)) & 0xFFFF)
52 #define FP_SEG(fp) ((((uintptr_t)(fp)) >> 16) & 0xFFFF)
53
54 #ifdef DEBUG
55 int biosdebug = 0;
56 #define dprintf(fmt) \
57 if (biosdebug) \
58 prom_printf fmt
59 #else
60 #define dprintf(fmt)
61 #endif
62
63 biosdev_data_t biosdev_info[BIOSDEV_NUM]; /* from 0x80 to 0x87 */
64 int dobiosdev = 1;
65
66
67 static int bios_check_extension_present(uchar_t);
68 static int get_dev_params(uchar_t);
69 static int read_firstblock(uchar_t drivenum);
70 static int drive_present(uchar_t drivenum);
71 static void reset_disk(uchar_t drivenum);
72 static int is_eltorito(uchar_t drivenum);
73
74 #if !defined(__xpv)
75 void
76 startup_bios_disk()
77 {
78 uchar_t drivenum;
79 int got_devparams = 0;
80 int got_first_block = 0;
81 uchar_t name[20];
82 dev_info_t *devi;
83 int extensions;
84
85 if (dobiosdev == 0)
86 return;
87
88 for (drivenum = 0x80; drivenum < (0x80 + BIOSDEV_NUM); drivenum++) {
89
90 if (!drive_present(drivenum))
91 continue;
92
93 extensions = bios_check_extension_present(drivenum);
94
95 /*
96 * If we're booting from an Eltorito CD/DVD image, there's
97 * no need to get the device parameters or read the first block
98 * because we'll never install onto this device.
99 */
100 if (extensions && is_eltorito(drivenum))
101 continue;
102
103 if (extensions && get_dev_params(drivenum))
104 got_devparams = 1;
105 else
106 got_devparams = 0;
107
108 if ((got_first_block = read_firstblock(drivenum)) == 0) {
109 /* retry */
110 got_first_block = read_firstblock(drivenum);
111 }
112
113 if (got_devparams || got_first_block) {
114 (void) sprintf((char *)name, "biosdev-0x%x", drivenum);
115 devi = ddi_root_node();
116 (void) e_ddi_prop_update_byte_array(DDI_DEV_T_NONE,
117 devi, (char *)name,
118 (uchar_t *)&biosdev_info[drivenum - 0x80],
119 sizeof (biosdev_data_t));
120 }
121 }
122 }
123 #endif
124
125 static int
126 bios_check_extension_present(uchar_t drivenum)
127 {
128 struct bop_regs rp = {0};
129 extern struct bootops *bootops;
130
131 rp.eax.word.ax = 0x4100;
132 rp.ebx.word.bx = 0x55AA;
133 rp.edx.word.dx = drivenum;
134
135 /* make sure we have extension support */
136 BOP_DOINT(bootops, 0x13, &rp);
137
138 if (((rp.eflags & PS_C) != 0) || (rp.ebx.word.bx != 0xAA55)) {
139 dprintf(("bios_check_extension_present int13 fn 41 "
140 "failed %d bx = %x\n", rp.eflags, rp.ebx.word.bx));
141 return (0);
142 }
143
144 if ((rp.ecx.word.cx & 0x7) == 0) {
145 dprintf(("bios_check_extension_present get device parameters "
146 "not supported cx = %x\n", rp.ecx.word.cx));
147 return (0);
148 }
149
150 return (1);
151 }
152
153 static int
154 get_dev_params(uchar_t drivenum)
155 {
156 struct bop_regs rp = {0};
157 fn48_t *bufp;
158 extern struct bootops *bootops;
159 int i;
160 int index;
161 uchar_t *tmp;
162
163 dprintf(("In get_dev_params\n"));
164
165 bufp = (fn48_t *)BIOS_RES_BUFFER_ADDR;
166
167 /*
168 * We cannot use bzero here as we're initializing data
169 * at an address below kernel base.
170 */
171 for (i = 0; i < sizeof (*bufp); i++)
172 ((uchar_t *)bufp)[i] = 0;
173
174 bufp->buflen = sizeof (*bufp);
175 rp.eax.word.ax = 0x4800;
176 rp.edx.byte.dl = drivenum;
177
178 rp.esi.word.si = (uint16_t)FP_OFF((uint_t)(uintptr_t)bufp);
179 rp.ds = FP_SEG((uint_t)(uintptr_t)bufp);
180
181 BOP_DOINT(bootops, 0x13, &rp);
182
183 if ((rp.eflags & PS_C) != 0) {
184 dprintf(("EDD FAILED on drive eflag = %x ah= %x\n",
185 rp.eflags, rp.eax.byte.ah));
186 return (0);
187 }
188
189 index = drivenum - 0x80;
190 biosdev_info[index].edd_valid = 1;
191
192 /*
193 * Some compilers turn a structure copy into a call
194 * to memcpy. Since we are copying data below kernel
195 * base intentionally, and memcpy asserts that's not
196 * the case, we do the copy manually here.
197 */
198 tmp = (uchar_t *)&biosdev_info[index].fn48_dev_params;
199 for (i = 0; i < sizeof (*bufp); i++)
200 tmp[i] = ((uchar_t *)bufp)[i];
201
202 return (1);
203 }
204
205 static int
206 drive_present(uchar_t drivenum)
207 {
208 struct bop_regs rp = {0};
209
210 rp.eax.byte.ah = 0x8; /* get params */
211 rp.edx.byte.dl = drivenum;
212
213 BOP_DOINT(bootops, 0x13, &rp);
214
215 if (((rp.eflags & PS_C) != 0) || rp.eax.byte.ah != 0) {
216 dprintf(("drive not present drivenum %x eflag %x ah %x\n",
217 drivenum, rp.eflags, rp.eax.byte.ah));
218 return (0);
219 }
220
221 dprintf(("drive-present %x\n", drivenum));
222 return (1);
223 }
224
225 static void
226 reset_disk(uchar_t drivenum)
227 {
228 struct bop_regs rp = {0};
229 int status;
230
231 rp.eax.byte.ah = 0x0; /* reset disk */
232 rp.edx.byte.dl = drivenum;
233
234 BOP_DOINT(bootops, 0x13, &rp);
235
236 status = rp.eax.byte.ah;
237
238 if (((rp.eflags & PS_C) != 0) || status != 0)
239 dprintf(("Bad disk reset driv %x, status %x\n", drivenum,
240 status));
241 }
242
243 /* Get first block */
244 static int
245 read_firstblock(uchar_t drivenum)
246 {
247
248 struct bop_regs rp = {0};
249 caddr_t bufp;
250 uchar_t status;
251 int i, index;
252
253
254 reset_disk(drivenum);
255 bufp = (caddr_t)BIOS_RES_BUFFER_ADDR;
256
257
258 rp.eax.byte.ah = 0x2; /* Read disk */
259 rp.eax.byte.al = 1; /* nsect */
260 rp.ecx.byte.ch = 0; /* cyl & 0xff */
261 rp.ecx.byte.cl = 1; /* cyl >> 2 & 0xc0 (sector number) */
262 rp.edx.byte.dh = 0; /* head */
263 rp.edx.byte.dl = drivenum; /* drivenum */
264
265 /* es:bx is buf address */
266 rp.ebx.word.bx = (uint16_t)FP_OFF((uint_t)(uintptr_t)bufp);
267 rp.es = FP_SEG((uint_t)(uintptr_t)bufp);
268
269 BOP_DOINT(bootops, 0x13, &rp);
270
271 status = rp.eax.byte.ah;
272 if (((rp.eflags & PS_C) != 0) || status != 0) {
273 dprintf(("read_firstblock AH not clear %x \n", status));
274 return (0);
275 }
276
277 dprintf(("drivenum %x uid at 0x1b8 is %x\n", drivenum,
278 *(uint32_t *)(bufp +0x1b8)));
279
280 index = drivenum - 0x80;
281
282 biosdev_info[index].first_block_valid = 1;
283 for (i = 0; i < 512; i++)
284 biosdev_info[index].first_block[i] = *((uchar_t *)bufp + i);
285
286 return (1);
287 }
288
289 static int
290 is_eltorito(uchar_t drivenum)
291 {
292 struct bop_regs rp = {0};
293 fn4b_t *bufp;
294 extern struct bootops *bootops;
295 int i;
296
297 dprintf(("In is_eltorito\n"));
298
299 bufp = (fn4b_t *)BIOS_RES_BUFFER_ADDR;
300
301 /*
302 * We cannot use bzero here as we're initializing data
303 * at an address below kernel base.
304 */
305 for (i = 0; i < sizeof (*bufp); i++)
306 ((uchar_t *)bufp)[i] = 0;
307
308 bufp->pkt_size = sizeof (*bufp);
309 rp.eax.word.ax = 0x4b01;
310 rp.edx.byte.dl = drivenum;
311
312 rp.esi.word.si = (uint16_t)FP_OFF((uint_t)(uintptr_t)bufp);
313 rp.ds = FP_SEG((uint_t)(uintptr_t)bufp);
314
315 BOP_DOINT(bootops, 0x13, &rp);
316
317 if ((rp.eflags & PS_C) != 0 || bufp->drivenum != drivenum) {
318 dprintf(("fn 0x4b01 FAILED on drive "
319 "eflags=%x ah=%x drivenum=%x\n",
320 rp.eflags, rp.eax.byte.ah, bufp->drivenum));
321 return (0);
322 }
323
324 if (prom_debug)
325 prom_printf("INT13 FN4B01 mtype => %x", bufp->boot_mtype);
326
327 return (1);
328 }