1 // Code to load disk image and start system boot.
3 // Copyright (C) 2008-2010 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));
32 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 = "DVD/CD";
51 if (CONFIG_COREBOOT && 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 IPL entry for BAID cdrom.
92 add_baid_cdrom(struct drive_s *drive_g)
94 if (! CONFIG_CDROM_BOOT)
97 /* put first cdrom into ipl 3 for compatability with qemu */
98 struct ipl_entry_s *ie = &IPL.bev[2];
99 if (IPL.bevcount >= ARRAY_SIZE(IPL.bev) && ie->vector)
103 ie = &IPL.bev[IPL.bevcount++];
104 ie->type = IPL_TYPE_CDROM;
105 ie->vector = (u32)drive_g;
106 ie->description = "DVD/CD";
109 // Add a bcv entry for an expansion card harddrive or legacy option rom
111 add_bcv(u16 seg, u16 ip, u16 desc)
115 if (IPL.bcvcount >= ARRAY_SIZE(IPL.bcv))
118 struct ipl_entry_s *ie = &IPL.bcv[IPL.bcvcount++];
119 ie->type = BCV_TYPE_EXTERNAL;
120 ie->vector = (seg << 16) | ip;
121 const char *d = "Legacy option rom";
123 d = MAKE_FLATPTR(seg, desc);
127 // Add a bcv entry for an internal harddrive
129 add_bcv_internal(struct drive_s *drive_g)
133 if (IPL.bcvcount >= ARRAY_SIZE(IPL.bcv))
136 struct ipl_entry_s *ie = &IPL.bcv[IPL.bcvcount++];
137 if (CONFIG_THREADS) {
138 // Add to bcv list with assured drive order.
139 struct ipl_entry_s *end = ie;
141 struct ipl_entry_s *prev = ie - 1;
142 if (prev < IPL.bcv || prev->type != BCV_TYPE_INTERNAL)
144 struct drive_s *prevdrive = (void*)prev->vector;
145 if (prevdrive->type < drive_g->type
146 || (prevdrive->type == drive_g->type
147 && prevdrive->cntl_id < drive_g->cntl_id))
152 memmove(ie+1, ie, (void*)end-(void*)ie);
154 ie->type = BCV_TYPE_INTERNAL;
155 ie->vector = (u32)drive_g;
156 ie->description = "";
160 /****************************************************************
161 * Boot menu and BCV execution
162 ****************************************************************/
164 // Show a generic menu item
166 menu_show_default(struct ipl_entry_s *ie, int menupos)
169 printf("%d. %s\n", menupos
170 , strtcpy(desc, ie->description, ARRAY_SIZE(desc)));
174 // Show floppy menu item - but only if there exists a floppy drive.
176 menu_show_floppy(struct ipl_entry_s *ie, int menupos)
179 for (i = 0; i < Drives.floppycount; i++) {
180 struct drive_s *drive_g = getDrive(EXTTYPE_FLOPPY, i);
181 printf("%d. Floppy [%s]\n", menupos + i, drive_g->desc);
183 return Drives.floppycount;
186 // Show menu items from BCV list.
188 menu_show_harddisk(struct ipl_entry_s *ie, int menupos)
191 for (i = 0; i < IPL.bcvcount; i++) {
192 struct ipl_entry_s *ie = &IPL.bcv[i];
193 struct drive_s *drive_g = (void*)ie->vector;
195 case BCV_TYPE_INTERNAL:
196 printf("%d. %s\n", menupos + i, drive_g->desc);
199 menu_show_default(ie, menupos+i);
206 // Show cdrom menu item - but only if there exists a cdrom drive.
208 menu_show_cdrom(struct ipl_entry_s *ie, int menupos)
210 struct drive_s *drive_g = (void*)ie->vector;
213 printf("%d. DVD/CD [%s]\n", menupos, drive_g->desc);
217 // Show coreboot-fs menu item.
219 menu_show_cbfs(struct ipl_entry_s *ie, int menupos)
222 struct cbfs_file *file = NULL;
224 file = cbfs_findprefix("img/", file);
227 const char *filename = cbfs_filename(file);
228 printf("%d. Payload [%s]\n", menupos + count, &filename[4]);
236 // Show IPL option menu.
238 interactive_bootmenu(void)
240 if (! CONFIG_BOOTMENU || ! qemu_cfg_show_boot_menu())
243 while (get_keystroke(0) >= 0)
246 printf("Press F12 for boot menu.\n\n");
249 int scan_code = get_keystroke(CONFIG_BOOTMENU_WAIT);
250 disable_bootsplash();
251 if (scan_code != 0x86)
255 while (get_keystroke(0) >= 0)
258 printf("Select boot device:\n\n");
261 int subcount[ARRAY_SIZE(IPL.bev)];
264 for (i = 0; i < IPL.bevcount; i++) {
265 struct ipl_entry_s *ie = &IPL.bev[i];
268 case IPL_TYPE_FLOPPY:
269 sc = menu_show_floppy(ie, menupos);
271 case IPL_TYPE_HARDDISK:
272 sc = menu_show_harddisk(ie, menupos);
275 sc = menu_show_cdrom(ie, menupos);
278 sc = menu_show_cbfs(ie, menupos);
281 sc = menu_show_default(ie, menupos);
289 scan_code = get_keystroke(1000);
290 if (scan_code == 0x01)
293 if (scan_code < 1 || scan_code > menupos)
295 int choice = scan_code - 1;
297 // Find out which IPL this was for.
299 while (choice > subcount[bev]) {
300 choice -= subcount[bev];
303 IPL.bev[bev].subchoice = choice-1;
305 // Add user choice to the boot order.
306 IPL.bootorder = (IPL.bootorder << 4) | (bev+1);
312 // Run the specified bcv.
314 run_bcv(struct ipl_entry_s *ie)
317 case BCV_TYPE_INTERNAL:
318 map_hd_drive((void*)ie->vector);
320 case BCV_TYPE_EXTERNAL:
321 call_bcv(ie->vector >> 16, ie->vector & 0xffff);
326 // Prepare for boot - show menu and run bcvs.
335 // XXX - show available drives?
337 // Allow user to modify BCV/IPL order.
338 interactive_bootmenu();
341 // Setup floppy boot order
342 int override = IPL.bev[0].subchoice;
343 struct drive_s *tmp = Drives.idmap[EXTTYPE_FLOPPY][0];
344 Drives.idmap[EXTTYPE_FLOPPY][0] = Drives.idmap[EXTTYPE_FLOPPY][override];
345 Drives.idmap[EXTTYPE_FLOPPY][override] = tmp;
348 override = IPL.bev[1].subchoice;
349 if (override < IPL.bcvcount)
350 run_bcv(&IPL.bcv[override]);
352 for (i=0; i<IPL.bcvcount; i++)
354 run_bcv(&IPL.bcv[i]);
358 /****************************************************************
359 * Boot code (int 18/19)
360 ****************************************************************/
362 // Jump to a bootup entry point.
364 call_boot_entry(u16 bootseg, u16 bootip, u8 bootdrv)
366 dprintf(1, "Booting from %04x:%04x\n", bootseg, bootip);
368 memset(&br, 0, sizeof(br));
370 br.code = SEGOFF(bootseg, bootip);
371 // Set the magic number in ax and the boot drive in dl.
377 // Boot from a disk (either floppy or harddrive)
379 boot_disk(u8 bootdrv, int checksig)
381 u16 bootseg = 0x07c0;
385 memset(&br, 0, sizeof(br));
392 call16_int(0x13, &br);
394 if (br.flags & F_CF) {
395 printf("Boot failed: could not read the boot disk\n\n");
400 struct mbr_s *mbr = (void*)0;
401 if (GET_FARVAR(bootseg, mbr->signature) != MBR_SIGNATURE) {
402 printf("Boot failed: not a bootable disk\n\n");
407 /* Canonicalize bootseg:bootip */
408 u16 bootip = (bootseg & 0x0fff) << 4;
411 call_boot_entry(bootseg, bootip, bootdrv);
414 // Boot from a CD-ROM
416 boot_cdrom(struct ipl_entry_s *ie)
418 if (! CONFIG_CDROM_BOOT)
424 struct drive_s *drive_g = (void*)ie->vector;
425 int status = cdrom_boot(drive_g);
427 printf("Boot failed: Could not read from CDROM %s (code %04x)\n", drive_g->desc, status);
431 u16 ebda_seg = get_ebda_seg();
432 u8 bootdrv = GET_EBDA2(ebda_seg, cdemu.emulated_extdrive);
433 u16 bootseg = GET_EBDA2(ebda_seg, cdemu.load_segment);
434 /* Canonicalize bootseg:bootip */
435 u16 bootip = (bootseg & 0x0fff) << 4;
438 call_boot_entry(bootseg, bootip, bootdrv);
441 // Boot from a CBFS payload
443 boot_cbfs(struct ipl_entry_s *ie)
445 if (!CONFIG_COREBOOT || !CONFIG_COREBOOT_FLASH)
447 int count = ie->subchoice;
448 struct cbfs_file *file = NULL;
450 file = cbfs_findprefix("img/", file);
455 cbfs_run_payload(file);
463 panic("Boot support not compiled in.\n");
465 u32 bootdev = IPL.bootorder;
466 bootdev >>= 4 * seq_nr;
469 /* Translate bootdev to an IPL table offset by subtracting 1 */
472 if (bootdev >= IPL.bevcount) {
473 printf("No bootable device.\n");
474 // Loop with irqs enabled - this allows ctrl+alt+delete to work.
479 /* Do the loading, and set up vector as a far pointer to the boot
480 * address, and bootdrv as the boot drive */
481 struct ipl_entry_s *ie = &IPL.bev[bootdev];
483 printf("Booting from %s...\n"
484 , strtcpy(desc, ie->description, ARRAY_SIZE(desc)));
487 case IPL_TYPE_FLOPPY:
488 boot_disk(0x00, IPL.checkfloppysig);
490 case IPL_TYPE_HARDDISK:
500 call_boot_entry(ie->vector >> 16, ie->vector & 0xffff, 0);
504 // Boot failed: invoke the boot recovery function
506 memset(&br, 0, sizeof(br));
508 call16_int(0x18, &br);
511 // Boot Failure recovery: try the next device.
515 debug_serial_setup();
516 debug_enter(NULL, DEBUG_HDL_18);
517 u16 ebda_seg = get_ebda_seg();
518 u16 seq = GET_EBDA2(ebda_seg, boot_sequence) + 1;
519 SET_EBDA2(ebda_seg, boot_sequence, seq);
523 // INT 19h Boot Load Service Entry Point
527 debug_serial_setup();
528 debug_enter(NULL, DEBUG_HDL_19);
529 SET_EBDA(boot_sequence, 0);