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 [", menupos + i);
163 describe_drive(drive_g);
166 return Drives.floppycount;
169 // Show menu items from BCV list.
171 menu_show_harddisk(struct ipl_entry_s *ie, int menupos)
174 for (i = 0; i < IPL.bcvcount; i++) {
175 struct ipl_entry_s *ie = &IPL.bcv[i];
177 case BCV_TYPE_INTERNAL:
178 printf("%d. ", menupos + i);
179 describe_drive((void*)ie->vector);
183 menu_show_default(ie, menupos+i);
190 // Show cdrom menu item - but only if there exists a cdrom drive.
192 menu_show_cdrom(struct ipl_entry_s *ie, int menupos)
195 for (i = 0; i < Drives.cdcount; i++) {
196 struct drive_s *drive_g = getDrive(EXTTYPE_CD, i);
197 printf("%d. CD-Rom [", menupos + i);
198 describe_drive(drive_g);
201 return Drives.cdcount;
204 // Show coreboot-fs menu item.
206 menu_show_cbfs(struct ipl_entry_s *ie, int menupos)
209 struct cbfs_file *file = NULL;
211 file = cbfs_findprefix("img/", file);
214 const char *filename = cbfs_filename(file);
215 printf("%d. Payload [%s]\n", menupos + count, &filename[4]);
223 // Show IPL option menu.
225 interactive_bootmenu()
227 if (! CONFIG_BOOTMENU || ! qemu_cfg_show_boot_menu())
230 while (get_keystroke(0) >= 0)
233 printf("Press F12 for boot menu.\n\n");
235 int scan_code = get_keystroke(CONFIG_BOOTMENU_WAIT);
236 if (scan_code != 0x86)
240 while (get_keystroke(0) >= 0)
243 printf("Select boot device:\n\n");
245 int subcount[ARRAY_SIZE(IPL.bev)];
248 for (i = 0; i < IPL.bevcount; i++) {
249 struct ipl_entry_s *ie = &IPL.bev[i];
252 case IPL_TYPE_FLOPPY:
253 sc = menu_show_floppy(ie, menupos);
255 case IPL_TYPE_HARDDISK:
256 sc = menu_show_harddisk(ie, menupos);
259 sc = menu_show_cdrom(ie, menupos);
262 sc = menu_show_cbfs(ie, menupos);
265 sc = menu_show_default(ie, menupos);
273 scan_code = get_keystroke(1000);
274 if (scan_code == 0x01)
277 if (scan_code < 1 || scan_code > menupos)
279 int choice = scan_code - 1;
281 // Find out which IPL this was for.
283 while (choice > subcount[bev]) {
284 choice -= subcount[bev];
287 IPL.bev[bev].subchoice = choice-1;
289 // Add user choice to the boot order.
290 IPL.bootorder = (IPL.bootorder << 4) | (bev+1);
296 // Run the specified bcv.
298 run_bcv(struct ipl_entry_s *ie)
301 case BCV_TYPE_INTERNAL:
302 map_hd_drive((void*)ie->vector);
304 case BCV_TYPE_EXTERNAL:
305 call_bcv(ie->vector >> 16, ie->vector & 0xffff);
310 // Prepare for boot - show menu and run bcvs.
317 // XXX - show available drives?
319 // Allow user to modify BCV/IPL order.
320 interactive_bootmenu();
322 // Setup floppy boot order
323 int override = IPL.bev[0].subchoice;
324 int tmp = Drives.idmap[EXTTYPE_FLOPPY][0];
325 Drives.idmap[EXTTYPE_FLOPPY][0] = Drives.idmap[EXTTYPE_FLOPPY][override];
326 Drives.idmap[EXTTYPE_FLOPPY][override] = tmp;
329 override = IPL.bev[1].subchoice;
330 if (override < IPL.bcvcount)
331 run_bcv(&IPL.bcv[override]);
333 for (i=0; i<IPL.bcvcount; i++)
335 run_bcv(&IPL.bcv[i]);
339 /****************************************************************
340 * Boot code (int 18/19)
341 ****************************************************************/
343 // Jump to a bootup entry point.
345 call_boot_entry(u16 bootseg, u16 bootip, u8 bootdrv)
347 dprintf(1, "Booting from %04x:%04x\n", bootseg, bootip);
350 memset(&br, 0, sizeof(br));
352 br.code = SEGOFF(bootseg, bootip);
353 // Set the magic number in ax and the boot drive in dl.
359 // Boot from a disk (either floppy or harddrive)
361 boot_disk(u8 bootdrv, int checksig)
363 u16 bootseg = 0x07c0;
367 memset(&br, 0, sizeof(br));
374 call16_int(0x13, &br);
376 if (br.flags & F_CF) {
377 printf("Boot failed: could not read the boot disk\n\n");
382 struct mbr_s *mbr = (void*)0;
383 if (GET_FARVAR(bootseg, mbr->signature) != MBR_SIGNATURE) {
384 printf("Boot failed: not a bootable disk\n\n");
389 /* Canonicalize bootseg:bootip */
390 u16 bootip = (bootseg & 0x0fff) << 4;
393 call_boot_entry(bootseg, bootip, bootdrv);
396 // Boot from a CD-ROM
398 boot_cdrom(struct ipl_entry_s *ie)
400 if (! CONFIG_CDROM_BOOT)
402 int status = cdrom_boot(ie->subchoice);
404 printf("Boot failed: Could not read from CDROM (code %04x)\n", status);
408 u16 ebda_seg = get_ebda_seg();
409 u8 bootdrv = GET_EBDA2(ebda_seg, cdemu.emulated_extdrive);
410 u16 bootseg = GET_EBDA2(ebda_seg, cdemu.load_segment);
411 /* Canonicalize bootseg:bootip */
412 u16 bootip = (bootseg & 0x0fff) << 4;
415 call_boot_entry(bootseg, bootip, bootdrv);
418 // Boot from a CBFS payload
420 boot_cbfs(struct ipl_entry_s *ie)
422 if (! CONFIG_COREBOOT_FLASH)
424 int count = ie->subchoice;
425 struct cbfs_file *file = NULL;
427 file = cbfs_findprefix("img/", file);
432 cbfs_run_payload(file);
440 panic("Boot support not compiled in.\n");
442 u32 bootdev = IPL.bootorder;
443 bootdev >>= 4 * seq_nr;
446 /* Translate bootdev to an IPL table offset by subtracting 1 */
449 if (bootdev >= IPL.bevcount) {
450 printf("No bootable device.\n");
451 // Loop with irqs enabled - this allows ctrl+alt+delete to work.
456 /* Do the loading, and set up vector as a far pointer to the boot
457 * address, and bootdrv as the boot drive */
458 struct ipl_entry_s *ie = &IPL.bev[bootdev];
460 printf("Booting from %s...\n"
461 , strtcpy(desc, ie->description, ARRAY_SIZE(desc)));
464 case IPL_TYPE_FLOPPY:
465 boot_disk(0x00, IPL.checkfloppysig);
467 case IPL_TYPE_HARDDISK:
477 call_boot_entry(ie->vector >> 16, ie->vector & 0xffff, 0);
481 // Boot failed: invoke the boot recovery function
483 memset(&br, 0, sizeof(br));
485 call16_int(0x18, &br);
488 // Boot Failure recovery: try the next device.
492 debug_serial_setup();
493 debug_enter(NULL, DEBUG_HDL_18);
494 u16 ebda_seg = get_ebda_seg();
495 u16 seq = GET_EBDA2(ebda_seg, boot_sequence) + 1;
496 SET_EBDA2(ebda_seg, boot_sequence, seq);
500 // INT 19h Boot Load Service Entry Point
504 debug_serial_setup();
505 debug_enter(NULL, DEBUG_HDL_19);
506 SET_EBDA(boot_sequence, 0);