| Commit message (Collapse) | Author | Age | Files | Lines |
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EFI systems typically don't support booting off ISO 9660 filesystems,
even if written to USB sticks. This patch adds support for generating a
GPT that covers the stick as well, with an additional partition entry
pointing purely at the secondary El Torito image. When burned to CD the
secondary El Torito will be used as an EFI boot image, and when written
to a USB stick the GPT partition will be found and may be booted from.
However, some earlier EFI Macs don't support booting from El Torito
images via EFI. To cater for them this also supports generating an Apple
partition table, allowing a third El Torito image in HFS+ format to be
made available to the firmware. This requires padding the MBR images
slightly in order to leave space for the Apple header, but should have
no functional impact.
Sadly, this breaks the workaround for Acer BIOSes (magic xor
instruction) when Mac support is enabled via -m... not much that can
be done about that.
Signed-off-by: Matthew Garrett <mjg@redhat.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
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Apparently some BIOSes (including some Acer Travelmate machines)
require an MBR to start with 0x33; apparently Micro$oft MBRs start
with 33 C0, an alternate coding of the "xorw %ax,%ax" instruction. As
such, follow suit to work on these braindead BIOSes.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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Update the check for !GPT to match the updated protocol (with length).
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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Actually generate the stack frame isolinux expects. This is not the
optimal order, but it appears to be what both earlier and later
versions of isolinux expects...
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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The partition information is pointed to by ds:si; although ds
will *usually* be 0 it isn't guaranteed (in particular, it may
very well be 0x40 or 0x60); therefore, move the partition parsing
up before the reset of %ds and %es. As a side benefit, we get
to use push again...
Also, fix the ordering of the two halves of the GPT LBA!
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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Revert the isohybrid handover protocol so that it has a stack format
compatible with the previous versions; that way we can also revert the
magic number to a compatible one.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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Fix CBIOS in isohybrid mode. Also allow an isohybrid image to be
booted from a partition. Unfortunately this breaks compatibility
between differing versions of isohybrid and isolinux.bin.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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Produce MBR variants with normal (DL) behavior, force to drive 80
behavior, and force to 80 on Ctrl pressed behavior.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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Impact: cleanup
Use a symbolic constant for BIOS_kbdflags instead of open-coding the
address.
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
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Impact: BIOS bug workaround, possible unexpected consequences?
Escape hatch for BIOSes which pass in garbage in DL: if the Ctrl key
is pressed during boot, force the drive number to 0x80.
Based on a patch by "TJ <ubuntu@tjworld.net>".
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
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Remove a stay jmpw *%si which was a test instruction and wasn't meant
to have been checked in.
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Some, unknown, version of gas or ld miscompiles a relative jump to an
absolute symbol, resulting in a broken isohybrid. Implement a
workaround for it by using a far jmp, which is absolute. Fortunately,
the isohybrid prefix is one of the very few boot sectors we have which
isn't short on space.
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Using addw to restore the stack pointer clobbers CF. Use leaw
instead, even though this relies on the BIOS not clobbering %si.
Worst case we can add a mov %sp, %si or similar.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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Save one byte in isohdpfx.S.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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We were incorrectly not passing the EBIOS flag in hybrid HDD mode;
also compute the EBIOS LBA correctly in hybrid HDD mode. Allow a
34-bit LBA for this, that way we still support up to 2^32 CD-ROM
sectors (8 TB).
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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Still a work in progress.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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