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2005-02-15 Yoshinori K. Okuji <okuji@enbug.org>

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* stage2/builtins.c (install_func): If DEST_DRIVE is a hard
  disk, enable the workaround in Stage 1 by replacing the jmp
  with double nop's.

  * stage1/stage1.h (STAGE1_BOOT_DRIVE_CHECK): New macro.
  (STAGE1_BOOT_DRIVE_MASK): Removed.

  * stage1/stage1.S (boot_drive_check): New label. This implements
  a different workaround for buggy BIOSes which don't pass boot
  drive correctly. This is effective for BIOSes which pass a value
  without the seventh bit (0x80).
  (boot_drive_mask): Removed.
This commit is contained in:
okuji committed 2005-02-15 22:05:07 +00:00
1 parent fb908db4ad
commit 041e243877
5 files changed
+41 -12
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stage2/builtins.c
+7 -5
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@@ -1952,11 +1952,13 @@ install_func (char *arg, int flags)
/* Set the "force LBA" flag. */
*((unsigned char *) (stage1_buffer + STAGE1_FORCE_LBA)) = is_force_lba;
/* Set the boot drive mask. This is a workaround for buggy BIOSes which
don't pass boot drive correctly. Instead, they pass 0x00 even when
booted from 0x80. */
*((unsigned char *) (stage1_buffer + STAGE1_BOOT_DRIVE_MASK))
= (dest_drive & BIOS_FLAG_FIXED_DISK);
/* If DEST_DRIVE is a hard disk, enable the workaround, which is
for buggy BIOSes which don't pass boot drive correctly. Instead,
they pass 0x00 or 0x01 even when booted from 0x80. */
if (dest_drive & BIOS_FLAG_FIXED_DISK)
/* Replace the jmp (2 bytes) with double nop's. */
*((unsigned short *) (stage1_buffer + STAGE1_BOOT_DRIVE_CHECK))
= 0x9090;
/* Read the first sector of Stage 2. */
disk_read_hook = disk_read_savesect_func;