prep_segment() can sometimes fail because an image requests memory
that is already in use by gPXE. This will happen if
e.g. undionly.kpxe is used to boot memtest86; the memtest86 image is
an old-format kernel that needs to be loaded at 9000:0000, but this
area of memory may well already be in use by the underlying PXE stack.
Add a human-friendly error message, so that the cause is more
immediately visible.
This allows gPXE to load memtest86, which is packaged as an old kernel.
Split all code that directly touches the kernel headers out into
bzimage_parse_header() and bzimage_update_header(), to reduce code
size and offset the cost of supporting older kernels.
Total cost of this feature: 11 bytes (uncompressed).
bin/embedded.o has a build dependency on bin/.embedded.list, which
gets generated automatically by the Makefile. However, if the
EMBEDDED_IMAGE list is empty, bin/.embedded.list will never be
created, and so bin/embedded.o will be rebuilt every time due to a
missing dependency.
Fix by forcing bin/.embedded.list to be created even if the list is
empty.
The pcnet32 driver mismanages its RX buffers, with the result that
packets get corrupted if more than one packet arrives between calls to
poll().
Originally-fixed-by: Bill Lortz <Bill.Lortz@premier.org>
Reviewed-by: Stefan Hajnoczi <stefanha@gmail.com>
Tested-by: Stefan Hajnoczi <stefanha@gmail.com>
Also adds the MAC_ADDR_CORRECT flag, to indicate whether or not the
MAC address needs to be fixed up by the driver.
Signed-off-by: Michael Brown <mcb30@etherboot.org>
Reviewed-by: Stefan Hajnoczi <stefanha@gmail.com>
Reviewed-by: Thomas Miletich <thomas.miletich@gmail.com>
Modified-by: Michael Brown <mcb30@etherboot.org>
Signed-off-by: Michael Brown <mcb30@etherboot.org>
This is a major rewrite of the legacy etherboot 3c90x driver using the
gPXE API for much improved performance over the legacy driver it
replaces.
This driver has been tested on 3c905, 3c905B, and 3c905C cards.
Reviewed-by: Stefan Hajnoczi <stefanha@gmail.com>
Reviewed-by: Marty Connor <mdc@etherboot.org>
Tested-by: Marty Connor <mdc@etherboot.org>
Tested-by: Daniel Verkamp <daniel@drv.nu>
Signed-off-by: Marty Connor <mdc@etherboot.org>
Eliminate the potential for mismatches between table names and the
table entry data type by incorporating the data type into the
definition of the table, rather than specifying it explicitly in each
table accessor method.
Intel's C compiler (icc) chokes on the zero-length arrays that we
currently use as part of the mechanism for accessing linker table
entries. Abstract away the zero-length arrays, to make a port to icc
easier.
Introduce macros such as for_each_table_entry() to simplify the common
case of iterating over all entries in a linker table.
Represent table names as #defined string constants rather than
unquoted literals; this avoids visual confusion between table names
and C variable or type names, and also allows us to force a
compilation error in the event of incorrect table names.
Some firewall devices seem to regard SYN,PSH as an invalid flag
combination and reject the packet. Fix by setting PSH only if SYN is
not set.
Reported-by: DSE Incorporated <dseinc@gmail.com>
The parsing of the !PXE and PXENV+ structures share a fair bit of
code; merge the common code to save a few bytes.
Signed-off-by: Michael Brown <mcb30@etherboot.org>
Allow for settings blocks to be created on demand. This allows for
constructions such as
set defaults/filename http://bootserver/bootfile
set defaults/priority 0xff
dhcp net0
chain ${filename}
which will boot from the DHCP-provided filename, or from
"http://bootserver/bootfile" if the DHCP server does not provide a
filename.
(Note that "priority" gets interpreted as a signed integer, so setting
"defaults/priority" to 0xff will cause the "defaults" settings block
to have an effective priority of -1.)
Following the example of the Linux driver, we add a check and delay to
make sure that the NIC has finished resetting before the driver issues
any additional commands.
Signed-off-by: Marty Connor <mdc@etherboot.org>
Having a default script containing
#!gpxe
autoboot
can cause problems when entering commands to load and start a kernel
manually; the default script image will still be present when the
kernel is started and so will be treated as an initrd. It is possible
to work around this by typing "imgfree" before any other commands, but
this is counter-intuitive.
Fix by allowing the embedded image list to be empty (in which case we
just call autoboot()), and making this the default.
Reported by alkisg@gmail.com.
Search for the PXE entry points (via the !PXE or PXENV+ structures)
through all known combinations of search methods. Furthermore, if we
find a PXENV+ structure, attempt to use it to find the !PXE structure
if at all possible.
Avoid passing credentials in the iBFT that were available but not
required for login. This works around a problem in the Microsoft
iSCSI initiator, which will refuse to initiate sessions if the CHAP
password is fewer than 12 characters, even if the target ends up not
asking for CHAP authentication.
It is a programming error, not a runtime error, if we attempt to use
block ciphers with an incorrect blocksize, so use an assert() rather
than an error status return.
The various types of cryptographic algorithm are fundamentally
different, and it was probably a mistake to try to handle them via a
single common type.
pubkey_algorithm is a placeholder type for now.
The PXE 1.x spec specifies that on NBP entry or on return from INT
1Ah AX=5650h, EDX shall point to the physical address of the PXENV+
structure. The PXE 2.x spec drops this requirement, simply stating
that EDX is clobbered. Given the principle "be conservative in what
you send, liberal in what you accept", however, we should implement
this anyway.
Certain combinations of PXE stack and BIOS result in a broken INT 18
call, which will leave the system displaying a "PRESS ANY KEY TO
REBOOT" message instead of proceeding to the next boot device. On
these systems, returning via the PXE stack is the only way to continue
to the next boot device. Returning via the PXE stack works only if we
haven't already blown away the PXE base code in pxeprefix.S.
In most circumstances, we do want to blow away the PXE base code.
Base memory is a limited resource, and it is desirable to reclaim as
much as possible. When we perform an iSCSI boot, we need to place the
iBFT above the 512kB mark, because otherwise it may not be detected by
the loaded OS; this may not be possible if the PXE base code is still
occupying that memory.
Introduce a new prefix type .kkpxe which will preserve both the PXE
base code and the UNDI driver (as compared to .kpxe, which preserves
the UNDI driver but uninstalls the PXE base code). This prefix type
can be used on systems that are known to experience the specific
problem of INT 18 being broken, or in builds (such as gpxelinux.0) for
which it is particularly important to know that returning to the BIOS
will work.
Written by H. Peter Anvin <hpa@zytor.com> and Stefan Hajnoczi
<stefanha@gmail.com>, minor structural alterations by Michael Brown
<mcb30@etherboot.org>.
