1 // Code to load disk image and start system boot.
3 // Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
4 // Copyright (C) 2002 MandrakeSoft S.A.
6 // This file may be distributed under the terms of the GNU LGPLv3 license.
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
20 /****************************************************************
21 * IPL and BCV handlers
22 ****************************************************************/
29 dprintf(3, "init boot device ordering\n");
31 memset(&IPL, 0, sizeof(IPL));
34 struct ipl_entry_s *ie = &IPL.bev[0];
35 ie->type = IPL_TYPE_FLOPPY;
36 ie->description = "Floppy";
40 ie->type = IPL_TYPE_HARDDISK;
41 ie->description = "Hard Disk";
45 if (CONFIG_CDROM_BOOT) {
46 ie->type = IPL_TYPE_CDROM;
47 ie->description = "CD-Rom";
51 if (CONFIG_COREBOOT_FLASH) {
52 ie->type = IPL_TYPE_CBFS;
53 ie->description = "CBFS";
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;
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;
72 // Add a BEV vector for a given pnp compatible option rom.
74 add_bev(u16 seg, u16 bev, u16 desc)
78 if (IPL.bevcount >= ARRAY_SIZE(IPL.bev))
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";
86 d = MAKE_FLATPTR(seg, desc);
90 // Add a bcv entry for an expansion card harddrive or legacy option rom
92 add_bcv(u16 seg, u16 ip, u16 desc)
96 if (IPL.bcvcount >= ARRAY_SIZE(IPL.bcv))
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";
104 d = MAKE_FLATPTR(seg, desc);
108 // Add a bcv entry for an internal harddrive
110 add_bcv_internal(struct drive_s *drive_g)
114 if (IPL.bcvcount >= ARRAY_SIZE(IPL.bcv))
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;
122 struct ipl_entry_s *prev = ie - 1;
123 if (prev < IPL.bcv || prev->type != BCV_TYPE_INTERNAL)
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))
133 memmove(ie+1, ie, (void*)end-(void*)ie);
135 ie->type = BCV_TYPE_INTERNAL;
136 ie->vector = (u32)drive_g;
137 ie->description = "";
141 /****************************************************************
142 * Boot menu and BCV execution
143 ****************************************************************/
145 // Show a generic menu item
147 menu_show_default(struct ipl_entry_s *ie, int menupos)
150 printf("%d. %s\n", menupos
151 , strtcpy(desc, ie->description, ARRAY_SIZE(desc)));
155 // Show floppy menu item - but only if there exists a floppy drive.
157 menu_show_floppy(struct ipl_entry_s *ie, int menupos)
160 for (i = 0; i < Drives.floppycount; i++) {
161 struct drive_s *drive_g = getDrive(EXTTYPE_FLOPPY, i);
162 printf("%d. Floppy [%s]\n", menupos + i, drive_g->desc);
164 return Drives.floppycount;
167 // Show menu items from BCV list.
169 menu_show_harddisk(struct ipl_entry_s *ie, int menupos)
172 for (i = 0; i < IPL.bcvcount; i++) {
173 struct ipl_entry_s *ie = &IPL.bcv[i];
174 struct drive_s *drive_g = (void*)ie->vector;
176 case BCV_TYPE_INTERNAL:
177 printf("%d. %s\n", menupos + i, drive_g->desc);
180 menu_show_default(ie, menupos+i);
187 // Show cdrom menu item - but only if there exists a cdrom drive.
189 menu_show_cdrom(struct ipl_entry_s *ie, int menupos)
192 for (i = 0; i < Drives.cdcount; i++) {
193 struct drive_s *drive_g = getDrive(EXTTYPE_CD, i);
194 printf("%d. CD-Rom [%s]\n", menupos + i, drive_g->desc);
196 return Drives.cdcount;
199 // Show coreboot-fs menu item.
201 menu_show_cbfs(struct ipl_entry_s *ie, int menupos)
204 struct cbfs_file *file = NULL;
206 file = cbfs_findprefix("img/", file);
209 const char *filename = cbfs_filename(file);
210 printf("%d. Payload [%s]\n", menupos + count, &filename[4]);
218 // Show IPL option menu.
220 interactive_bootmenu(void)
222 if (! CONFIG_BOOTMENU || ! qemu_cfg_show_boot_menu())
225 while (get_keystroke(0) >= 0)
228 printf("Press F12 for boot menu.\n\n");
230 int scan_code = get_keystroke(CONFIG_BOOTMENU_WAIT);
231 if (scan_code != 0x86)
235 while (get_keystroke(0) >= 0)
238 printf("Select boot device:\n\n");
240 int subcount[ARRAY_SIZE(IPL.bev)];
243 for (i = 0; i < IPL.bevcount; i++) {
244 struct ipl_entry_s *ie = &IPL.bev[i];
247 case IPL_TYPE_FLOPPY:
248 sc = menu_show_floppy(ie, menupos);
250 case IPL_TYPE_HARDDISK:
251 sc = menu_show_harddisk(ie, menupos);
254 sc = menu_show_cdrom(ie, menupos);
257 sc = menu_show_cbfs(ie, menupos);
260 sc = menu_show_default(ie, menupos);
268 scan_code = get_keystroke(1000);
269 if (scan_code == 0x01)
272 if (scan_code < 1 || scan_code > menupos)
274 int choice = scan_code - 1;
276 // Find out which IPL this was for.
278 while (choice > subcount[bev]) {
279 choice -= subcount[bev];
282 IPL.bev[bev].subchoice = choice-1;
284 // Add user choice to the boot order.
285 IPL.bootorder = (IPL.bootorder << 4) | (bev+1);
291 // Run the specified bcv.
293 run_bcv(struct ipl_entry_s *ie)
296 case BCV_TYPE_INTERNAL:
297 map_hd_drive((void*)ie->vector);
299 case BCV_TYPE_EXTERNAL:
300 call_bcv(ie->vector >> 16, ie->vector & 0xffff);
305 // Prepare for boot - show menu and run bcvs.
312 // XXX - show available drives?
314 // Allow user to modify BCV/IPL order.
315 interactive_bootmenu();
317 // Setup floppy boot order
318 int override = IPL.bev[0].subchoice;
319 struct drive_s *tmp = Drives.idmap[EXTTYPE_FLOPPY][0];
320 Drives.idmap[EXTTYPE_FLOPPY][0] = Drives.idmap[EXTTYPE_FLOPPY][override];
321 Drives.idmap[EXTTYPE_FLOPPY][override] = tmp;
324 override = IPL.bev[1].subchoice;
325 if (override < IPL.bcvcount)
326 run_bcv(&IPL.bcv[override]);
328 for (i=0; i<IPL.bcvcount; i++)
330 run_bcv(&IPL.bcv[i]);
334 /****************************************************************
335 * Boot code (int 18/19)
336 ****************************************************************/
338 // Jump to a bootup entry point.
340 call_boot_entry(u16 bootseg, u16 bootip, u8 bootdrv)
342 dprintf(1, "Booting from %04x:%04x\n", bootseg, bootip);
345 memset(&br, 0, sizeof(br));
347 br.code = SEGOFF(bootseg, bootip);
348 // Set the magic number in ax and the boot drive in dl.
354 // Boot from a disk (either floppy or harddrive)
356 boot_disk(u8 bootdrv, int checksig)
358 u16 bootseg = 0x07c0;
362 memset(&br, 0, sizeof(br));
369 call16_int(0x13, &br);
371 if (br.flags & F_CF) {
372 printf("Boot failed: could not read the boot disk\n\n");
377 struct mbr_s *mbr = (void*)0;
378 if (GET_FARVAR(bootseg, mbr->signature) != MBR_SIGNATURE) {
379 printf("Boot failed: not a bootable disk\n\n");
384 /* Canonicalize bootseg:bootip */
385 u16 bootip = (bootseg & 0x0fff) << 4;
388 call_boot_entry(bootseg, bootip, bootdrv);
391 // Boot from a CD-ROM
393 boot_cdrom(struct ipl_entry_s *ie)
395 if (! CONFIG_CDROM_BOOT)
397 int status = cdrom_boot(ie->subchoice);
399 printf("Boot failed: Could not read from CDROM (code %04x)\n", status);
403 u16 ebda_seg = get_ebda_seg();
404 u8 bootdrv = GET_EBDA2(ebda_seg, cdemu.emulated_extdrive);
405 u16 bootseg = GET_EBDA2(ebda_seg, cdemu.load_segment);
406 /* Canonicalize bootseg:bootip */
407 u16 bootip = (bootseg & 0x0fff) << 4;
410 call_boot_entry(bootseg, bootip, bootdrv);
413 // Boot from a CBFS payload
415 boot_cbfs(struct ipl_entry_s *ie)
417 if (! CONFIG_COREBOOT_FLASH)
419 int count = ie->subchoice;
420 struct cbfs_file *file = NULL;
422 file = cbfs_findprefix("img/", file);
427 cbfs_run_payload(file);
435 panic("Boot support not compiled in.\n");
437 u32 bootdev = IPL.bootorder;
438 bootdev >>= 4 * seq_nr;
441 /* Translate bootdev to an IPL table offset by subtracting 1 */
444 if (bootdev >= IPL.bevcount) {
445 printf("No bootable device.\n");
446 // Loop with irqs enabled - this allows ctrl+alt+delete to work.
451 /* Do the loading, and set up vector as a far pointer to the boot
452 * address, and bootdrv as the boot drive */
453 struct ipl_entry_s *ie = &IPL.bev[bootdev];
455 printf("Booting from %s...\n"
456 , strtcpy(desc, ie->description, ARRAY_SIZE(desc)));
459 case IPL_TYPE_FLOPPY:
460 boot_disk(0x00, IPL.checkfloppysig);
462 case IPL_TYPE_HARDDISK:
472 call_boot_entry(ie->vector >> 16, ie->vector & 0xffff, 0);
476 // Boot failed: invoke the boot recovery function
478 memset(&br, 0, sizeof(br));
480 call16_int(0x18, &br);
483 // Boot Failure recovery: try the next device.
487 debug_serial_setup();
488 debug_enter(NULL, DEBUG_HDL_18);
489 u16 ebda_seg = get_ebda_seg();
490 u16 seq = GET_EBDA2(ebda_seg, boot_sequence) + 1;
491 SET_EBDA2(ebda_seg, boot_sequence, seq);
495 // INT 19h Boot Load Service Entry Point
499 debug_serial_setup();
500 debug_enter(NULL, DEBUG_HDL_19);
501 SET_EBDA(boot_sequence, 0);