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 = BCV_TYPE_EXTERNAL;
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 internal harddrive
109 add_bcv_internal(int driveid)
113 if (IPL.bcvcount >= ARRAY_SIZE(IPL.bcv))
116 struct ipl_entry_s *ie = &IPL.bcv[IPL.bcvcount++];
117 ie->type = BCV_TYPE_INTERNAL;
118 ie->vector = driveid;
119 ie->description = "";
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 int driveid = Drives.idmap[EXTTYPE_FLOPPY][i];
144 printf("%d. Floppy [", menupos + i);
145 describe_drive(driveid);
148 return Drives.floppycount;
151 // Show menu items from BCV list.
153 menu_show_harddisk(struct ipl_entry_s *ie, int menupos)
156 for (i = 0; i < IPL.bcvcount; i++) {
157 struct ipl_entry_s *ie = &IPL.bcv[i];
159 case BCV_TYPE_INTERNAL:
160 printf("%d. ", menupos + i);
161 describe_drive(ie->vector);
165 menu_show_default(ie, menupos+i);
172 // Show cdrom menu item - but only if there exists a cdrom drive.
174 menu_show_cdrom(struct ipl_entry_s *ie, int menupos)
177 for (i = 0; i < Drives.cdcount; i++) {
178 int driveid = Drives.idmap[EXTTYPE_CD][i];
179 printf("%d. CD-Rom [", menupos + i);
180 describe_drive(driveid);
183 return Drives.cdcount;
186 // Show coreboot-fs menu item.
188 menu_show_cbfs(struct ipl_entry_s *ie, int menupos)
191 struct cbfs_file *file;
193 file = cbfs_findprefix("img/", file);
196 const char *filename = cbfs_filename(file);
197 printf("%d. Payload [%s]\n", menupos + count, &filename[4]);
205 // Show IPL option menu.
207 interactive_bootmenu()
209 if (! CONFIG_BOOTMENU)
212 while (get_keystroke(0) >= 0)
215 printf("Press F12 for boot menu.\n\n");
217 int scan_code = get_keystroke(CONFIG_BOOTMENU_WAIT);
218 if (scan_code != 0x86)
222 while (get_keystroke(0) >= 0)
225 printf("Select boot device:\n\n");
227 int subcount[ARRAY_SIZE(IPL.bev)];
230 for (i = 0; i < IPL.bevcount; i++) {
231 struct ipl_entry_s *ie = &IPL.bev[i];
234 case IPL_TYPE_FLOPPY:
235 sc = menu_show_floppy(ie, menupos);
237 case IPL_TYPE_HARDDISK:
238 sc = menu_show_harddisk(ie, menupos);
241 sc = menu_show_cdrom(ie, menupos);
244 sc = menu_show_cbfs(ie, menupos);
247 sc = menu_show_default(ie, menupos);
255 scan_code = get_keystroke(1000);
256 if (scan_code == 0x01)
259 if (scan_code < 1 || scan_code > menupos)
261 int choice = scan_code - 1;
263 // Find out which IPL this was for.
265 while (choice > subcount[bev]) {
266 choice -= subcount[bev];
269 IPL.bev[bev].subchoice = choice-1;
271 // Add user choice to the boot order.
272 IPL.bootorder = (IPL.bootorder << 4) | (bev+1);
278 // Run the specified bcv.
280 run_bcv(struct ipl_entry_s *ie)
283 case BCV_TYPE_INTERNAL:
284 map_hd_drive(ie->vector);
286 case BCV_TYPE_EXTERNAL:
287 call_bcv(ie->vector >> 16, ie->vector & 0xffff);
292 // Prepare for boot - show menu and run bcvs.
299 // Allow user to modify BCV/IPL order.
300 interactive_bootmenu();
302 // Setup floppy boot order
303 int override = IPL.bev[0].subchoice;
304 int tmp = Drives.idmap[EXTTYPE_FLOPPY][0];
305 Drives.idmap[EXTTYPE_FLOPPY][0] = Drives.idmap[EXTTYPE_FLOPPY][override];
306 Drives.idmap[EXTTYPE_FLOPPY][override] = tmp;
309 override = IPL.bev[1].subchoice;
310 if (override < IPL.bcvcount)
311 run_bcv(&IPL.bcv[override]);
313 for (i=0; i<IPL.bcvcount; i++)
315 run_bcv(&IPL.bcv[i]);
319 /****************************************************************
320 * Boot code (int 18/19)
321 ****************************************************************/
323 // Jump to a bootup entry point.
325 call_boot_entry(u16 bootseg, u16 bootip, u8 bootdrv)
327 dprintf(1, "Booting from %04x:%04x\n", bootseg, bootip);
330 memset(&br, 0, sizeof(br));
331 br.code = SEGOFF(bootseg, bootip);
332 // Set the magic number in ax and the boot drive in dl.
338 // Boot from a disk (either floppy or harddrive)
340 boot_disk(u8 bootdrv, int checksig)
342 u16 bootseg = 0x07c0;
346 memset(&br, 0, sizeof(br));
352 call16_int(0x13, &br);
354 if (br.flags & F_CF) {
355 printf("Boot failed: could not read the boot disk\n\n");
360 struct mbr_s *mbr = (void*)0;
361 if (GET_FARVAR(bootseg, mbr->signature) != MBR_SIGNATURE) {
362 printf("Boot failed: not a bootable disk\n\n");
367 /* Canonicalize bootseg:bootip */
368 u16 bootip = (bootseg & 0x0fff) << 4;
371 call_boot_entry(bootseg, bootip, bootdrv);
374 // Boot from a CD-ROM
376 boot_cdrom(struct ipl_entry_s *ie)
378 if (! CONFIG_CDROM_BOOT)
380 int status = cdrom_boot(ie->subchoice);
382 printf("Boot failed: Could not read from CDROM (code %04x)\n", status);
386 u16 ebda_seg = get_ebda_seg();
387 u8 bootdrv = GET_EBDA2(ebda_seg, cdemu.emulated_extdrive);
388 u16 bootseg = GET_EBDA2(ebda_seg, cdemu.load_segment);
389 /* Canonicalize bootseg:bootip */
390 u16 bootip = (bootseg & 0x0fff) << 4;
393 call_boot_entry(bootseg, bootip, bootdrv);
396 // Boot from a CBFS payload
398 boot_cbfs(struct ipl_entry_s *ie)
400 if (! CONFIG_COREBOOT_FLASH)
402 int count = ie->subchoice;
403 struct cbfs_file *file;
405 file = cbfs_findprefix("img/", file);
410 cbfs_run_payload(file);
418 panic("Boot support not compiled in.\n");
420 u32 bootdev = IPL.bootorder;
421 bootdev >>= 4 * seq_nr;
424 /* Translate bootdev to an IPL table offset by subtracting 1 */
427 if (bootdev >= IPL.bevcount) {
428 printf("No bootable device.\n");
429 // Loop with irqs enabled - this allows ctrl+alt+delete to work.
434 /* Do the loading, and set up vector as a far pointer to the boot
435 * address, and bootdrv as the boot drive */
436 struct ipl_entry_s *ie = &IPL.bev[bootdev];
438 printf("Booting from %s...\n"
439 , strtcpy(desc, ie->description, ARRAY_SIZE(desc)));
442 case IPL_TYPE_FLOPPY:
443 boot_disk(0x00, IPL.checkfloppysig);
445 case IPL_TYPE_HARDDISK:
455 call_boot_entry(ie->vector >> 16, ie->vector & 0xffff, 0);
459 // Boot failed: invoke the boot recovery function
461 memset(&br, 0, sizeof(br));
462 call16_int(0x18, &br);
465 // Boot Failure recovery: try the next device.
469 debug_serial_setup();
470 debug_enter(NULL, DEBUG_HDL_18);
471 u16 ebda_seg = get_ebda_seg();
472 u16 seq = GET_EBDA2(ebda_seg, boot_sequence) + 1;
473 SET_EBDA2(ebda_seg, boot_sequence, seq);
477 // INT 19h Boot Load Service Entry Point
481 debug_serial_setup();
482 debug_enter(NULL, DEBUG_HDL_19);
483 SET_EBDA(boot_sequence, 0);