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" // irq_enable
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
19 /****************************************************************
20 * IPL and BCV handlers
21 ****************************************************************/
28 dprintf(3, "init boot device ordering\n");
30 memset(&IPL, 0, sizeof(IPL));
33 struct ipl_entry_s *ie = &IPL.bev[0];
34 ie->type = IPL_TYPE_FLOPPY;
35 ie->description = "Floppy";
39 ie->type = IPL_TYPE_HARDDISK;
40 ie->description = "Hard Disk";
44 if (CONFIG_CDROM_BOOT) {
45 ie->type = IPL_TYPE_CDROM;
46 ie->description = "CD-Rom";
50 if (CONFIG_COREBOOT_FLASH) {
51 ie->type = IPL_TYPE_CBFS;
52 ie->description = "CBFS";
56 IPL.bevcount = ie - IPL.bev;
57 SET_EBDA(boot_sequence, 0xffff);
58 if (CONFIG_COREBOOT) {
59 // XXX - hardcode defaults for coreboot.
60 IPL.bootorder = 0x87654231;
61 IPL.checkfloppysig = 1;
63 // On emulators, get boot order from nvram.
64 IPL.bootorder = (inb_cmos(CMOS_BIOS_BOOTFLAG2)
65 | ((inb_cmos(CMOS_BIOS_BOOTFLAG1) & 0xf0) << 4));
66 if (!(inb_cmos(CMOS_BIOS_BOOTFLAG1) & 1))
67 IPL.checkfloppysig = 1;
71 // Add a BEV vector for a given pnp compatible option rom.
73 add_bev(u16 seg, u16 bev, u16 desc)
77 if (IPL.bevcount >= ARRAY_SIZE(IPL.bev))
80 struct ipl_entry_s *ie = &IPL.bev[IPL.bevcount++];
81 ie->type = IPL_TYPE_BEV;
82 ie->vector = (seg << 16) | bev;
83 const char *d = "Unknown";
85 d = MAKE_FLATPTR(seg, desc);
89 // Add a bcv entry for an expansion card harddrive or legacy option rom
91 add_bcv(u16 seg, u16 ip, u16 desc)
95 if (IPL.bcvcount >= ARRAY_SIZE(IPL.bcv))
98 struct ipl_entry_s *ie = &IPL.bcv[IPL.bcvcount++];
99 ie->type = IPL_TYPE_BEV;
100 ie->vector = (seg << 16) | ip;
101 const char *d = "Legacy option rom";
103 d = MAKE_FLATPTR(seg, desc);
107 // Add a bcv entry for an ata harddrive
109 add_bcv_hd(int driveid, const char *desc)
113 if (IPL.bcvcount >= ARRAY_SIZE(IPL.bcv))
116 struct ipl_entry_s *ie = &IPL.bcv[IPL.bcvcount++];
117 ie->type = IPL_TYPE_HARDDISK;
118 ie->vector = driveid;
119 ie->description = desc;
123 /****************************************************************
124 * Boot menu and BCV execution
125 ****************************************************************/
127 // Show a generic menu item
129 menu_show_default(struct ipl_entry_s *ie, int menupos)
132 printf("%d. %s\n", menupos
133 , strtcpy(desc, ie->description, ARRAY_SIZE(desc)));
137 // Show floppy menu item - but only if there exists a floppy drive.
139 menu_show_floppy(struct ipl_entry_s *ie, int menupos)
142 for (i = 0; i < Drives.floppycount; i++) {
143 printf("%d. floppy %d\n", menupos + i, i+1);
145 return Drives.floppycount;
148 // Show menu items from BCV list.
150 menu_show_harddisk(struct ipl_entry_s *ie, int menupos)
153 for (i = 0; i < IPL.bcvcount; i++) {
154 struct ipl_entry_s *ie = &IPL.bcv[i];
156 case IPL_TYPE_HARDDISK:
157 printf("%d. ata%d-%d %s\n", menupos + i
158 , ie->vector / 2, ie->vector % 2, ie->description);
161 menu_show_default(ie, menupos+i);
168 // Show cdrom menu item - but only if there exists a cdrom drive.
170 menu_show_cdrom(struct ipl_entry_s *ie, int menupos)
173 for (i = 0; i < Drives.cdcount; i++) {
174 int driveid = Drives.idmap[EXTTYPE_CD][i];
175 printf("%d. CD-Rom [ata%d-%d %s]\n", menupos + i
176 , driveid / 2, driveid % 2, Drives.drives[driveid].model);
178 return Drives.cdcount;
181 // Show coreboot-fs menu item.
183 menu_show_cbfs(struct ipl_entry_s *ie, int menupos)
186 struct cbfs_file *file;
188 file = cbfs_findprefix("img/", file);
191 const char *filename = cbfs_filename(file);
192 printf("%d. Payload [%s]\n", menupos + count, &filename[4]);
200 // Show IPL option menu.
202 interactive_bootmenu()
204 if (! CONFIG_BOOTMENU)
207 while (get_keystroke(0) >= 0)
210 printf("Press F12 for boot menu.\n\n");
212 int scan_code = get_keystroke(CONFIG_BOOTMENU_WAIT);
213 if (scan_code != 0x86)
217 while (get_keystroke(0) >= 0)
220 printf("Select boot device:\n\n");
222 int subcount[ARRAY_SIZE(IPL.bev)];
225 for (i = 0; i < IPL.bevcount; i++) {
226 struct ipl_entry_s *ie = &IPL.bev[i];
229 case IPL_TYPE_FLOPPY:
230 sc = menu_show_floppy(ie, menupos);
232 case IPL_TYPE_HARDDISK:
233 sc = menu_show_harddisk(ie, menupos);
236 sc = menu_show_cdrom(ie, menupos);
239 sc = menu_show_cbfs(ie, menupos);
242 sc = menu_show_default(ie, menupos);
250 scan_code = get_keystroke(1000);
251 if (scan_code == 0x01)
254 if (scan_code < 1 || scan_code > menupos)
256 int choice = scan_code - 1;
258 // Find out which IPL this was for.
260 while (choice > subcount[bev]) {
261 choice -= subcount[bev];
264 IPL.bev[bev].subchoice = choice-1;
266 // Add user choice to the boot order.
267 IPL.bootorder = (IPL.bootorder << 4) | (bev+1);
273 // Run the specified bcv.
275 run_bcv(struct ipl_entry_s *ie)
278 case IPL_TYPE_HARDDISK:
279 map_hd_drive(ie->vector);
282 call_bcv(ie->vector >> 16, ie->vector & 0xffff);
287 // Prepare for boot - show menu and run bcvs.
294 // Allow user to modify BCV/IPL order.
295 interactive_bootmenu();
297 // Setup floppy boot order
298 int override = IPL.bev[0].subchoice;
299 int tmp = Drives.idmap[EXTTYPE_FLOPPY][0];
300 Drives.idmap[EXTTYPE_FLOPPY][0] = Drives.idmap[EXTTYPE_FLOPPY][override];
301 Drives.idmap[EXTTYPE_FLOPPY][override] = tmp;
304 override = IPL.bev[1].subchoice;
305 if (override < IPL.bcvcount)
306 run_bcv(&IPL.bcv[override]);
308 for (i=0; i<IPL.bcvcount; i++)
310 run_bcv(&IPL.bcv[i]);
314 /****************************************************************
315 * Boot code (int 18/19)
316 ****************************************************************/
318 // Jump to a bootup entry point.
320 call_boot_entry(u16 bootseg, u16 bootip, u8 bootdrv)
322 dprintf(1, "Booting from %04x:%04x\n", bootseg, bootip);
325 memset(&br, 0, sizeof(br));
328 // Set the magic number in ax and the boot drive in dl.
334 // Boot from a disk (either floppy or harddrive)
336 boot_disk(u8 bootdrv, int checksig)
338 u16 bootseg = 0x07c0;
342 memset(&br, 0, sizeof(br));
348 call16_int(0x13, &br);
350 if (br.flags & F_CF) {
351 printf("Boot failed: could not read the boot disk\n\n");
356 struct mbr_s *mbr = (void*)0;
357 if (GET_FARVAR(bootseg, mbr->signature) != MBR_SIGNATURE) {
358 printf("Boot failed: not a bootable disk\n\n");
363 /* Canonicalize bootseg:bootip */
364 u16 bootip = (bootseg & 0x0fff) << 4;
367 call_boot_entry(bootseg, bootip, bootdrv);
370 // Boot from a CD-ROM
372 boot_cdrom(struct ipl_entry_s *ie)
374 if (! CONFIG_CDROM_BOOT)
376 int status = cdrom_boot(ie->subchoice);
378 printf("Boot failed: Could not read from CDROM (code %04x)\n", status);
382 u16 ebda_seg = get_ebda_seg();
383 u8 bootdrv = GET_EBDA2(ebda_seg, cdemu.emulated_extdrive);
384 u16 bootseg = GET_EBDA2(ebda_seg, cdemu.load_segment);
385 /* Canonicalize bootseg:bootip */
386 u16 bootip = (bootseg & 0x0fff) << 4;
389 call_boot_entry(bootseg, bootip, bootdrv);
392 // Boot from a CBFS payload
394 boot_cbfs(struct ipl_entry_s *ie)
396 if (! CONFIG_COREBOOT_FLASH)
398 int count = ie->subchoice;
399 struct cbfs_file *file;
401 file = cbfs_findprefix("img/", file);
406 cbfs_run_payload(file);
414 panic("Boot support not compiled in.\n");
416 u32 bootdev = IPL.bootorder;
417 bootdev >>= 4 * seq_nr;
420 /* Translate bootdev to an IPL table offset by subtracting 1 */
423 if (bootdev >= IPL.bevcount) {
424 printf("No bootable device.\n");
425 // Loop with irqs enabled - this allows ctrl+alt+delete to work.
430 /* Do the loading, and set up vector as a far pointer to the boot
431 * address, and bootdrv as the boot drive */
432 struct ipl_entry_s *ie = &IPL.bev[bootdev];
434 printf("Booting from %s...\n"
435 , strtcpy(desc, ie->description, ARRAY_SIZE(desc)));
438 case IPL_TYPE_FLOPPY:
439 boot_disk(0x00, IPL.checkfloppysig);
441 case IPL_TYPE_HARDDISK:
451 call_boot_entry(ie->vector >> 16, ie->vector & 0xffff, 0);
455 // Boot failed: invoke the boot recovery function
457 memset(&br, 0, sizeof(br));
458 call16_int(0x18, &br);
461 // Boot Failure recovery: try the next device.
465 debug_serial_setup();
466 debug_enter(NULL, DEBUG_HDL_18);
467 u16 ebda_seg = get_ebda_seg();
468 u16 seq = GET_EBDA2(ebda_seg, boot_sequence) + 1;
469 SET_EBDA2(ebda_seg, boot_sequence, seq);
473 // INT 19h Boot Load Service Entry Point
477 debug_serial_setup();
478 debug_enter(NULL, DEBUG_HDL_19);
479 SET_EBDA(boot_sequence, 0);