-// 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.
+// This file may be distributed under the terms of the GNU LGPLv3 license.
#include "util.h" // irq_enable
-#include "biosvar.h" // struct bregs
+#include "biosvar.h" // GET_EBDA
#include "config.h" // CONFIG_*
-#include "ata.h" // ata_detect
#include "disk.h" // cdrom_boot
+#include "bregs.h" // struct bregs
+#include "boot.h" // struct ipl_s
-// 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[] VISIBLE16 __attribute__((aligned (2))) = " $PnP";
+struct ipl_s IPL;
//--------------------------------------------------------------------------
// print_boot_device
void
printf_bootdev(u16 bootdev)
{
- u16 type = GET_EBDA(ipl.table[bootdev].type);
+ u16 type = IPL.table[bootdev].type;
/* NIC appears as type 0x80 */
if (type == IPL_TYPE_BEV)
printf("%s", drivetypes[type]);
/* print product string if BEV */
- void *far_description = (void*)GET_EBDA(ipl.table[bootdev].description);
+ char *far_description = 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);
+ memcpy_far(MAKE_FARPTR(GET_SEG(SS), description), far_description, 32);
/* terminate string */
description[32] = 0;
printf(" [%.s]", description);
static void
try_boot(u16 seq_nr)
{
- irq_enable();
+ if (! CONFIG_BOOT)
+ BX_PANIC("Boot support not compiled in.\n");
- SET_EBDA(ipl.sequence, seq_nr);
-
- u32 bootdev = GET_EBDA(ipl.bootorder);
+ u32 bootdev = IPL.bootorder;
bootdev >>= 4 * seq_nr;
bootdev &= 0xf;
/* Translate bootdev to an IPL table offset by subtracting 1 */
bootdev -= 1;
- if (bootdev >= GET_EBDA(ipl.count)) {
+ if (bootdev >= IPL.count) {
dprintf(1, "Invalid boot device (0x%x)\n", bootdev);
return;
}
* address, and bootdrv as the boot drive */
print_boot_device(bootdev);
- u16 type = GET_EBDA(ipl.table[bootdev].type);
+ u16 type = 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 configured for it */
- if (type != IPL_TYPE_FLOPPY || GET_EBDA(ipl.checkfloppysig)) {
+ if (type != IPL_TYPE_FLOPPY || IPL.checkfloppysig) {
if (GET_FARVAR(bootseg, *(u16*)0x1fe) != 0xaa55) {
print_boot_failure(type, 0);
return;
case IPL_TYPE_CDROM: {
/* CD-ROM */
if (! CONFIG_CDROM_BOOT)
- break;
- u16 status = cdrom_boot();
+ return;
+ 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);
+ u16 ebda_seg = get_ebda_seg();
+ bootdrv = GET_EBDA2(ebda_seg, cdemu.emulated_drive);
+ bootseg = GET_EBDA2(ebda_seg, cdemu.load_segment);
/* Canonicalize bootseg:bootip */
bootip = (bootseg & 0x0fff) << 4;
bootseg &= 0xf000;
case IPL_TYPE_BEV: {
/* Expansion ROM with a Bootstrap Entry Vector (a far
* pointer) */
- u32 vector = GET_EBDA(ipl.table[bootdev].vector);
+ u32 vector = IPL.table[bootdev].vector;
bootseg = vector >> 16;
bootip = vector & 0xffff;
break;
}
// Boot Failure recovery: try the next device.
-void VISIBLE16
+void VISIBLE32
handle_18()
{
+ debug_serial_setup();
debug_enter(NULL, DEBUG_HDL_18);
- u16 seq = GET_EBDA(ipl.sequence) + 1;
+ u16 ebda_seg = get_ebda_seg();
+ u16 seq = GET_EBDA2(ebda_seg, boot_sequence) + 1;
+ SET_EBDA2(ebda_seg, boot_sequence, seq);
do_boot(seq);
}
// INT 19h Boot Load Service Entry Point
-void VISIBLE16
+void VISIBLE32
handle_19()
{
+ debug_serial_setup();
debug_enter(NULL, DEBUG_HDL_19);
+ SET_EBDA(boot_sequence, 0);
do_boot(0);
}
+
+// 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");