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Up to [Qemu by Fabrice Bellard] / qemu / roms / seabios / src|
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1.1 root 1: // Code to load disk image and start system boot.
2: //
3: // Copyright (C) 2008 Kevin O'Connor <[email protected]>
4: // Copyright (C) 2002 MandrakeSoft S.A.
5: //
6: // This file may be distributed under the terms of the GNU LGPLv3 license.
7:
8: #include "util.h" // dprintf
9: #include "biosvar.h" // GET_EBDA
10: #include "config.h" // CONFIG_*
11: #include "disk.h" // cdrom_boot
12: #include "bregs.h" // struct bregs
13: #include "boot.h" // struct ipl_s
14: #include "cmos.h" // inb_cmos
15: #include "paravirt.h"
16:
17: struct ipl_s IPL;
18:
19:
20: /****************************************************************
21: * IPL and BCV handlers
22: ****************************************************************/
23:
24: void
1.1.1.2 root 25: boot_setup(void)
1.1 root 26: {
27: if (! CONFIG_BOOT)
28: return;
29: dprintf(3, "init boot device ordering\n");
30:
31: memset(&IPL, 0, sizeof(IPL));
1.1.1.3 ! root 32: struct ipl_entry_s *ie = &IPL.bev[0];
1.1 root 33:
34: // Floppy drive
35: ie->type = IPL_TYPE_FLOPPY;
36: ie->description = "Floppy";
37: ie++;
38:
39: // First HDD
40: ie->type = IPL_TYPE_HARDDISK;
41: ie->description = "Hard Disk";
42: ie++;
43:
44: // CDROM
45: if (CONFIG_CDROM_BOOT) {
46: ie->type = IPL_TYPE_CDROM;
1.1.1.3 ! root 47: ie->description = "DVD/CD";
1.1 root 48: ie++;
49: }
50:
1.1.1.3 ! root 51: if (CONFIG_COREBOOT && CONFIG_COREBOOT_FLASH) {
1.1 root 52: ie->type = IPL_TYPE_CBFS;
53: ie->description = "CBFS";
54: ie++;
55: }
56:
57: IPL.bevcount = ie - IPL.bev;
58: SET_EBDA(boot_sequence, 0xffff);
59: if (CONFIG_COREBOOT) {
60: // XXX - hardcode defaults for coreboot.
61: IPL.bootorder = 0x87654231;
62: IPL.checkfloppysig = 1;
63: } else {
64: // On emulators, get boot order from nvram.
65: IPL.bootorder = (inb_cmos(CMOS_BIOS_BOOTFLAG2)
66: | ((inb_cmos(CMOS_BIOS_BOOTFLAG1) & 0xf0) << 4));
67: if (!(inb_cmos(CMOS_BIOS_BOOTFLAG1) & 1))
68: IPL.checkfloppysig = 1;
69: }
70: }
71:
72: // Add a BEV vector for a given pnp compatible option rom.
73: void
74: add_bev(u16 seg, u16 bev, u16 desc)
75: {
76: if (! CONFIG_BOOT)
77: return;
78: if (IPL.bevcount >= ARRAY_SIZE(IPL.bev))
79: return;
80:
81: struct ipl_entry_s *ie = &IPL.bev[IPL.bevcount++];
82: ie->type = IPL_TYPE_BEV;
83: ie->vector = (seg << 16) | bev;
84: const char *d = "Unknown";
85: if (desc)
86: d = MAKE_FLATPTR(seg, desc);
87: ie->description = d;
88: }
89:
90: // Add a bcv entry for an expansion card harddrive or legacy option rom
91: void
92: add_bcv(u16 seg, u16 ip, u16 desc)
93: {
94: if (! CONFIG_BOOT)
95: return;
96: if (IPL.bcvcount >= ARRAY_SIZE(IPL.bcv))
97: return;
98:
99: struct ipl_entry_s *ie = &IPL.bcv[IPL.bcvcount++];
100: ie->type = BCV_TYPE_EXTERNAL;
101: ie->vector = (seg << 16) | ip;
102: const char *d = "Legacy option rom";
103: if (desc)
104: d = MAKE_FLATPTR(seg, desc);
105: ie->description = d;
106: }
107:
108: // Add a bcv entry for an internal harddrive
109: void
110: add_bcv_internal(struct drive_s *drive_g)
111: {
112: if (! CONFIG_BOOT)
113: return;
114: if (IPL.bcvcount >= ARRAY_SIZE(IPL.bcv))
115: return;
116:
117: struct ipl_entry_s *ie = &IPL.bcv[IPL.bcvcount++];
118: if (CONFIG_THREADS) {
119: // Add to bcv list with assured drive order.
120: struct ipl_entry_s *end = ie;
121: for (;;) {
122: struct ipl_entry_s *prev = ie - 1;
123: if (prev < IPL.bcv || prev->type != BCV_TYPE_INTERNAL)
124: break;
125: struct drive_s *prevdrive = (void*)prev->vector;
126: if (prevdrive->type < drive_g->type
127: || (prevdrive->type == drive_g->type
128: && prevdrive->cntl_id < drive_g->cntl_id))
129: break;
130: ie--;
131: }
132: if (ie != end)
133: memmove(ie+1, ie, (void*)end-(void*)ie);
134: }
135: ie->type = BCV_TYPE_INTERNAL;
136: ie->vector = (u32)drive_g;
137: ie->description = "";
138: }
139:
140:
141: /****************************************************************
142: * Boot menu and BCV execution
143: ****************************************************************/
144:
145: // Show a generic menu item
146: static int
147: menu_show_default(struct ipl_entry_s *ie, int menupos)
148: {
149: char desc[33];
150: printf("%d. %s\n", menupos
151: , strtcpy(desc, ie->description, ARRAY_SIZE(desc)));
152: return 1;
153: }
154:
155: // Show floppy menu item - but only if there exists a floppy drive.
156: static int
157: menu_show_floppy(struct ipl_entry_s *ie, int menupos)
158: {
159: int i;
160: for (i = 0; i < Drives.floppycount; i++) {
161: struct drive_s *drive_g = getDrive(EXTTYPE_FLOPPY, i);
1.1.1.3 ! root 162: printf("%d. Floppy [%s]\n", menupos + i, drive_g->desc);
1.1 root 163: }
164: return Drives.floppycount;
165: }
166:
167: // Show menu items from BCV list.
168: static int
169: menu_show_harddisk(struct ipl_entry_s *ie, int menupos)
170: {
171: int i;
172: for (i = 0; i < IPL.bcvcount; i++) {
173: struct ipl_entry_s *ie = &IPL.bcv[i];
1.1.1.3 ! root 174: struct drive_s *drive_g = (void*)ie->vector;
1.1 root 175: switch (ie->type) {
176: case BCV_TYPE_INTERNAL:
1.1.1.3 ! root 177: printf("%d. %s\n", menupos + i, drive_g->desc);
1.1 root 178: break;
179: default:
180: menu_show_default(ie, menupos+i);
181: break;
182: }
183: }
184: return IPL.bcvcount;
185: }
186:
187: // Show cdrom menu item - but only if there exists a cdrom drive.
188: static int
189: menu_show_cdrom(struct ipl_entry_s *ie, int menupos)
190: {
191: int i;
192: for (i = 0; i < Drives.cdcount; i++) {
193: struct drive_s *drive_g = getDrive(EXTTYPE_CD, i);
1.1.1.3 ! root 194: printf("%d. DVD/CD [%s]\n", menupos + i, drive_g->desc);
1.1 root 195: }
196: return Drives.cdcount;
197: }
198:
199: // Show coreboot-fs menu item.
200: static int
201: menu_show_cbfs(struct ipl_entry_s *ie, int menupos)
202: {
203: int count = 0;
204: struct cbfs_file *file = NULL;
205: for (;;) {
206: file = cbfs_findprefix("img/", file);
207: if (!file)
208: break;
209: const char *filename = cbfs_filename(file);
210: printf("%d. Payload [%s]\n", menupos + count, &filename[4]);
211: count++;
212: if (count > 8)
213: break;
214: }
215: return count;
216: }
217:
218: // Show IPL option menu.
219: static void
1.1.1.2 root 220: interactive_bootmenu(void)
1.1 root 221: {
222: if (! CONFIG_BOOTMENU || ! qemu_cfg_show_boot_menu())
223: return;
224:
225: while (get_keystroke(0) >= 0)
226: ;
227:
228: printf("Press F12 for boot menu.\n\n");
229:
230: int scan_code = get_keystroke(CONFIG_BOOTMENU_WAIT);
231: if (scan_code != 0x86)
232: /* not F12 */
233: return;
234:
235: while (get_keystroke(0) >= 0)
236: ;
237:
238: printf("Select boot device:\n\n");
1.1.1.3 ! root 239: wait_threads();
1.1 root 240:
241: int subcount[ARRAY_SIZE(IPL.bev)];
242: int menupos = 1;
243: int i;
244: for (i = 0; i < IPL.bevcount; i++) {
245: struct ipl_entry_s *ie = &IPL.bev[i];
246: int sc;
247: switch (ie->type) {
248: case IPL_TYPE_FLOPPY:
249: sc = menu_show_floppy(ie, menupos);
250: break;
251: case IPL_TYPE_HARDDISK:
252: sc = menu_show_harddisk(ie, menupos);
253: break;
254: case IPL_TYPE_CDROM:
255: sc = menu_show_cdrom(ie, menupos);
256: break;
257: case IPL_TYPE_CBFS:
258: sc = menu_show_cbfs(ie, menupos);
259: break;
260: default:
261: sc = menu_show_default(ie, menupos);
262: break;
263: }
264: subcount[i] = sc;
265: menupos += sc;
266: }
267:
268: for (;;) {
269: scan_code = get_keystroke(1000);
270: if (scan_code == 0x01)
271: // ESC
272: break;
273: if (scan_code < 1 || scan_code > menupos)
274: continue;
275: int choice = scan_code - 1;
276:
277: // Find out which IPL this was for.
278: int bev = 0;
279: while (choice > subcount[bev]) {
280: choice -= subcount[bev];
281: bev++;
282: }
283: IPL.bev[bev].subchoice = choice-1;
284:
285: // Add user choice to the boot order.
286: IPL.bootorder = (IPL.bootorder << 4) | (bev+1);
287: break;
288: }
289: printf("\n");
290: }
291:
292: // Run the specified bcv.
293: static void
294: run_bcv(struct ipl_entry_s *ie)
295: {
296: switch (ie->type) {
297: case BCV_TYPE_INTERNAL:
298: map_hd_drive((void*)ie->vector);
299: break;
300: case BCV_TYPE_EXTERNAL:
301: call_bcv(ie->vector >> 16, ie->vector & 0xffff);
302: break;
303: }
304: }
305:
306: // Prepare for boot - show menu and run bcvs.
307: void
1.1.1.2 root 308: boot_prep(void)
1.1 root 309: {
1.1.1.3 ! root 310: if (! CONFIG_BOOT) {
! 311: wait_threads();
1.1 root 312: return;
1.1.1.3 ! root 313: }
1.1 root 314:
315: // XXX - show available drives?
316:
317: // Allow user to modify BCV/IPL order.
318: interactive_bootmenu();
1.1.1.3 ! root 319: wait_threads();
1.1 root 320:
321: // Setup floppy boot order
322: int override = IPL.bev[0].subchoice;
1.1.1.3 ! root 323: struct drive_s *tmp = Drives.idmap[EXTTYPE_FLOPPY][0];
1.1 root 324: Drives.idmap[EXTTYPE_FLOPPY][0] = Drives.idmap[EXTTYPE_FLOPPY][override];
325: Drives.idmap[EXTTYPE_FLOPPY][override] = tmp;
326:
327: // Run BCVs
328: override = IPL.bev[1].subchoice;
329: if (override < IPL.bcvcount)
330: run_bcv(&IPL.bcv[override]);
331: int i;
332: for (i=0; i<IPL.bcvcount; i++)
333: if (i != override)
334: run_bcv(&IPL.bcv[i]);
335: }
336:
337:
338: /****************************************************************
339: * Boot code (int 18/19)
340: ****************************************************************/
341:
342: // Jump to a bootup entry point.
343: static void
344: call_boot_entry(u16 bootseg, u16 bootip, u8 bootdrv)
345: {
346: dprintf(1, "Booting from %04x:%04x\n", bootseg, bootip);
347:
1.1.1.3 ! root 348: /* Go back to text, the OS might expect it... (Can't do this any later) */
! 349: disable_bootsplash();
! 350:
1.1 root 351: struct bregs br;
352: memset(&br, 0, sizeof(br));
353: br.flags = F_IF;
354: br.code = SEGOFF(bootseg, bootip);
355: // Set the magic number in ax and the boot drive in dl.
356: br.dl = bootdrv;
357: br.ax = 0xaa55;
358: call16(&br);
359: }
360:
361: // Boot from a disk (either floppy or harddrive)
362: static void
363: boot_disk(u8 bootdrv, int checksig)
364: {
365: u16 bootseg = 0x07c0;
366:
367: // Read sector
368: struct bregs br;
369: memset(&br, 0, sizeof(br));
370: br.flags = F_IF;
371: br.dl = bootdrv;
372: br.es = bootseg;
373: br.ah = 2;
374: br.al = 1;
375: br.cl = 1;
376: call16_int(0x13, &br);
377:
378: if (br.flags & F_CF) {
379: printf("Boot failed: could not read the boot disk\n\n");
380: return;
381: }
382:
383: if (checksig) {
384: struct mbr_s *mbr = (void*)0;
385: if (GET_FARVAR(bootseg, mbr->signature) != MBR_SIGNATURE) {
386: printf("Boot failed: not a bootable disk\n\n");
387: return;
388: }
389: }
390:
391: /* Canonicalize bootseg:bootip */
392: u16 bootip = (bootseg & 0x0fff) << 4;
393: bootseg &= 0xf000;
394:
395: call_boot_entry(bootseg, bootip, bootdrv);
396: }
397:
398: // Boot from a CD-ROM
399: static void
400: boot_cdrom(struct ipl_entry_s *ie)
401: {
402: if (! CONFIG_CDROM_BOOT)
403: return;
404: int status = cdrom_boot(ie->subchoice);
405: if (status) {
406: printf("Boot failed: Could not read from CDROM (code %04x)\n", status);
407: return;
408: }
409:
410: u16 ebda_seg = get_ebda_seg();
411: u8 bootdrv = GET_EBDA2(ebda_seg, cdemu.emulated_extdrive);
412: u16 bootseg = GET_EBDA2(ebda_seg, cdemu.load_segment);
413: /* Canonicalize bootseg:bootip */
414: u16 bootip = (bootseg & 0x0fff) << 4;
415: bootseg &= 0xf000;
416:
417: call_boot_entry(bootseg, bootip, bootdrv);
418: }
419:
420: // Boot from a CBFS payload
421: static void
422: boot_cbfs(struct ipl_entry_s *ie)
423: {
1.1.1.3 ! root 424: if (!CONFIG_COREBOOT || !CONFIG_COREBOOT_FLASH)
1.1 root 425: return;
426: int count = ie->subchoice;
427: struct cbfs_file *file = NULL;
428: for (;;) {
429: file = cbfs_findprefix("img/", file);
430: if (!file)
431: return;
432: if (count--)
433: continue;
434: cbfs_run_payload(file);
435: }
436: }
437:
438: static void
439: do_boot(u16 seq_nr)
440: {
441: if (! CONFIG_BOOT)
442: panic("Boot support not compiled in.\n");
443:
444: u32 bootdev = IPL.bootorder;
445: bootdev >>= 4 * seq_nr;
446: bootdev &= 0xf;
447:
448: /* Translate bootdev to an IPL table offset by subtracting 1 */
449: bootdev -= 1;
450:
451: if (bootdev >= IPL.bevcount) {
452: printf("No bootable device.\n");
453: // Loop with irqs enabled - this allows ctrl+alt+delete to work.
454: for (;;)
1.1.1.3 ! root 455: wait_irq();
1.1 root 456: }
457:
458: /* Do the loading, and set up vector as a far pointer to the boot
459: * address, and bootdrv as the boot drive */
460: struct ipl_entry_s *ie = &IPL.bev[bootdev];
461: char desc[33];
462: printf("Booting from %s...\n"
463: , strtcpy(desc, ie->description, ARRAY_SIZE(desc)));
464:
465: switch(ie->type) {
466: case IPL_TYPE_FLOPPY:
467: boot_disk(0x00, IPL.checkfloppysig);
468: break;
469: case IPL_TYPE_HARDDISK:
470: boot_disk(0x80, 1);
471: break;
472: case IPL_TYPE_CDROM:
473: boot_cdrom(ie);
474: break;
475: case IPL_TYPE_CBFS:
476: boot_cbfs(ie);
477: break;
478: case IPL_TYPE_BEV:
479: call_boot_entry(ie->vector >> 16, ie->vector & 0xffff, 0);
480: break;
481: }
482:
483: // Boot failed: invoke the boot recovery function
484: struct bregs br;
485: memset(&br, 0, sizeof(br));
486: br.flags = F_IF;
487: call16_int(0x18, &br);
488: }
489:
490: // Boot Failure recovery: try the next device.
1.1.1.2 root 491: void VISIBLE32FLAT
492: handle_18(void)
1.1 root 493: {
494: debug_serial_setup();
495: debug_enter(NULL, DEBUG_HDL_18);
496: u16 ebda_seg = get_ebda_seg();
497: u16 seq = GET_EBDA2(ebda_seg, boot_sequence) + 1;
498: SET_EBDA2(ebda_seg, boot_sequence, seq);
499: do_boot(seq);
500: }
501:
502: // INT 19h Boot Load Service Entry Point
1.1.1.2 root 503: void VISIBLE32FLAT
504: handle_19(void)
1.1 root 505: {
506: debug_serial_setup();
507: debug_enter(NULL, DEBUG_HDL_19);
508: SET_EBDA(boot_sequence, 0);
509: do_boot(0);
510: }
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