-// 16bit code to load disk image and start system boot.
+// Code to load disk image and start system boot.
//
// Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
// Copyright (C) 2002 MandrakeSoft S.A.
// This file may be distributed under the terms of the GNU GPLv3 license.
#include "util.h" // irq_enable
-#include "biosvar.h" // struct bregs
+#include "biosvar.h" // GET_EBDA
#include "config.h" // CONFIG_*
-#include "cmos.h" // inb_cmos
#include "ata.h" // ata_detect
-
-// We need a copy of this string, but we are not actually a PnP BIOS,
-// so make sure it is *not* aligned, so OSes will not see it if they
-// scan.
-char pnp_string[] VISIBLE __attribute__((aligned (2))) = " $PnP";
+#include "disk.h" // cdrom_boot
+#include "bregs.h" // struct bregs
//--------------------------------------------------------------------------
// print_boot_device
//--------------------------------------------------------------------------
static const char drivetypes[][10]={
- "", "Floppy","Hard Disk","CD-Rom", "Network"
+ "", "Floppy", "Hard Disk", "CD-Rom", "Network"
};
-static void
-print_boot_device(u16 type)
+void
+printf_bootdev(u16 bootdev)
{
+ u16 type = GET_EBDA(ipl.table[bootdev].type);
+
/* NIC appears as type 0x80 */
if (type == IPL_TYPE_BEV)
type = 0x4;
if (type == 0 || type > 0x4)
BX_PANIC("Bad drive type\n");
- printf("Booting from %s...\n", drivetypes[type]);
+ printf("%s", drivetypes[type]);
+
+ /* print product string if BEV */
+ void *far_description = (void*)GET_EBDA(ipl.table[bootdev].description);
+ if (type == 4 && far_description != 0) {
+ char description[33];
+ /* first 32 bytes are significant */
+ memcpy(MAKE_FARPTR(GET_SEG(SS), &description), far_description, 32);
+ /* terminate string */
+ description[32] = 0;
+ printf(" [%.s]", description);
+ }
+}
- // XXX - latest cvs has BEV description
+static void
+print_boot_device(u16 bootdev)
+{
+ printf("Booting from ");
+ printf_bootdev(bootdev);
+ printf("...\n");
}
//--------------------------------------------------------------------------
static void
try_boot(u16 seq_nr)
{
- SET_IPL(sequence, seq_nr);
- u16 bootseg;
- u8 bootdrv = 0;
- u16 bootdev, bootip;
-
- if (CONFIG_ELTORITO_BOOT) {
- bootdev = inb_cmos(CMOS_BIOS_BOOTFLAG2);
- bootdev |= ((inb_cmos(CMOS_BIOS_BOOTFLAG1) & 0xf0) << 4);
- bootdev >>= 4 * seq_nr;
- bootdev &= 0xf;
- if (bootdev == 0)
- BX_PANIC("No bootable device.\n");
-
- /* Translate from CMOS runes to an IPL table offset by subtracting 1 */
- bootdev -= 1;
- } else {
- if (seq_nr ==2)
- BX_PANIC("No more boot devices.");
- if (!!(inb_cmos(CMOS_BIOS_CONFIG) & 0x20) ^ (seq_nr == 1))
- /* Boot from floppy if the bit is set or it's the second boot */
- bootdev = 0x00;
- else
- bootdev = 0x01;
- }
+ if (! CONFIG_BOOT)
+ BX_PANIC("Boot support not compiled in.\n");
- if (bootdev >= GET_IPL(count)) {
- BX_INFO("Invalid boot device (0x%x)\n", bootdev);
+ SET_EBDA(ipl.sequence, seq_nr);
+
+ u32 bootdev = GET_EBDA(ipl.bootorder);
+ bootdev >>= 4 * seq_nr;
+ bootdev &= 0xf;
+
+ if (bootdev == 0)
+ BX_PANIC("No bootable device.\n");
+
+ /* Translate bootdev to an IPL table offset by subtracting 1 */
+ bootdev -= 1;
+
+ if (bootdev >= GET_EBDA(ipl.count)) {
+ dprintf(1, "Invalid boot device (0x%x)\n", bootdev);
return;
}
- u16 type = GET_IPL(table[bootdev].type);
/* Do the loading, and set up vector as a far pointer to the boot
* address, and bootdrv as the boot drive */
- print_boot_device(type);
+ print_boot_device(bootdev);
+
+ u16 type = GET_EBDA(ipl.table[bootdev].type);
+ u16 bootseg, bootip;
+ u8 bootdrv = 0;
struct bregs cr;
switch(type) {
- case IPL_TYPE_FLOPPY: /* FDD */
- case IPL_TYPE_HARDDISK: /* HDD */
+ case IPL_TYPE_FLOPPY:
+ case IPL_TYPE_HARDDISK:
bootdrv = (type == IPL_TYPE_HARDDISK) ? 0x80 : 0x00;
bootseg = 0x07c0;
}
/* Always check the signature on a HDD boot sector; on FDD,
- * only do the check if the CMOS doesn't tell us to skip it */
- if ((type != IPL_TYPE_FLOPPY)
- || !((inb_cmos(CMOS_BIOS_BOOTFLAG1) & 0x01))) {
+ * only do the check if configured for it */
+ if (type != IPL_TYPE_FLOPPY || GET_EBDA(ipl.checkfloppysig)) {
if (GET_FARVAR(bootseg, *(u16*)0x1fe) != 0xaa55) {
print_boot_failure(type, 0);
return;
bootip = (bootseg & 0x0fff) << 4;
bootseg &= 0xf000;
break;
- case IPL_TYPE_CDROM: /* CD-ROM */
- // XXX
- return;
+ case IPL_TYPE_CDROM: {
+ /* CD-ROM */
+ if (! CONFIG_CDROM_BOOT)
+ break;
+ int status = cdrom_boot();
+ if (status) {
+ printf("CDROM boot failure code : %04x\n", status);
+ print_boot_failure(type, 1);
+ return;
+ }
+
+ bootdrv = GET_EBDA(cdemu.emulated_drive);
+ bootseg = GET_EBDA(cdemu.load_segment);
+ /* Canonicalize bootseg:bootip */
+ bootip = (bootseg & 0x0fff) << 4;
+ bootseg &= 0xf000;
break;
+ }
case IPL_TYPE_BEV: {
/* Expansion ROM with a Bootstrap Entry Vector (a far
* pointer) */
- u32 vector = GET_IPL(table[bootdev].vector);
+ u32 vector = GET_EBDA(ipl.table[bootdev].vector);
bootseg = vector >> 16;
bootip = vector & 0xffff;
break;
return;
}
+ /* Debugging info */
+ dprintf(1, "Booting from %x:%x\n", bootseg, bootip);
+
memset(&cr, 0, sizeof(cr));
cr.ip = bootip;
cr.cs = bootseg;
cr.dl = bootdrv;
cr.ax = 0xaa55;
call16(&cr);
+}
+
+static void
+do_boot(u16 seq_nr)
+{
+ try_boot(seq_nr);
// Boot failed: invoke the boot recovery function
- memset(&cr, 0, sizeof(cr));
- call16_int(0x18, &cr);
+ struct bregs br;
+ memset(&br, 0, sizeof(br));
+ call16_int(0x18, &br);
}
// Boot Failure recovery: try the next device.
-void VISIBLE
+void VISIBLE32
handle_18()
{
- debug_enter(NULL);
- u16 seq = GET_IPL(sequence) + 1;
- try_boot(seq);
+ debug_serial_setup();
+ debug_enter(NULL, DEBUG_HDL_18);
+ u16 seq = GET_EBDA(ipl.sequence) + 1;
+ do_boot(seq);
}
// INT 19h Boot Load Service Entry Point
-void VISIBLE
+void VISIBLE32
handle_19()
{
- debug_enter(NULL);
- try_boot(0);
+ debug_serial_setup();
+ debug_enter(NULL, DEBUG_HDL_19);
+ do_boot(0);
}
-// Called from 32bit code - start boot process
-void VISIBLE
-begin_boot()
-{
- ata_detect();
- irq_enable();
- struct bregs br;
- memset(&br, 0, sizeof(br));
- call16_int(0x19, &br);
-}
+// Ughh - some older gcc compilers have a bug which causes VISIBLE32
+// functions to not be exported as global variables.
+asm(".global handle_18, handle_19");
projects / seabios.git / blobdiff