[legal] Add mechanism for explicit per-file licence declarations
For partly historical reasons, various files in the gPXE source tree
are licensed under different, though compatible, terms. Most of the
code is licensed under GPLv2 with the "or later" clause, but there are
exceptions such as:
The string.h file, which derives from Linux and is licensed as
Public Domain.
The EFI header files, which are taken from the EDK2 source tree and
are licensed under BSD.
The 3c90x driver, which has a custom GPL-like licence text.
Introduce a FILE_LICENCE() macro to make licensing more explicit.
This macro should be applied exactly once to each source (.c, .S or
.h) file. It will cause a corresponding zero-sized common symbol to
be added to any .o files generated from that source file (and hence to
any final gPXE binaries generated from that source file). Determining
the applicable licences to generated files can then be done using e.g.
$ objdump -t bin/process.o | grep __licence
00000000 O *COM* 00000001 .hidden __licence_gpl2_or_later
indicating that bin/process.o is covered entirely by the GPLv2
with the "or later" clause, or
$ objdump -t bin/rtl8139.dsk.tmp | grep __licence
00033e8c g O .bss.textdata 00000000 .hidden __licence_gpl2_only
00033e8c g O .bss.textdata 00000000 .hidden __licence_gpl2_or_later
00033e8c g O .bss.textdata 00000000 .hidden __licence_public_domain
indicating that bin/rtl8139.dsk includes both code licensed under
GPLv2 (both with and without the "or later" clause) and code licensed
as Public Domain.
Determining the result of licence combinations is currently left as an
exercise for the reader.
[pxeprefix] Work around bug in Etherboot 5.4 when loading undionly.kpxe
Etherboot 5.4 erroneously treats PXENV_UNLOAD_STACK as the "final
shutdown" call, and unhooks INT15. When using gPXE's undionly.kpxe,
this results in gPXE overwriting the portion of Etherboot located in
high memory, because it is no longer hidden from the system memory map
at the time that gPXE loads.
Work around this by explicitly testing for Etherboot as the underlying
PXE stack (as is already done in undinet.c) and skipping the call to
PXENV_UNLOAD_STACK if necessary.
[build] Fix signed/unsigned division in util/zbin.c
Commit b149a99 ([build] Round up SUBx deltas) introduced a
signed/unsigned issue that affects gPXE images built on 32-bit hosts.
The zbin fixup utility performed an unsigned division, which led to
.usb images with an incorrect number of sectors to load.
The issue snuck by on 64-bit hosts since uint32_t is promoted to long.
On 32-bit hosts it is promoted to unsigned long.
Modified-by: Michael Brown <mcb30@etherboot.org>
Signed-off-by: Michael Brown <mcb30@etherboot.org>
[elf] Work around entry point bug in NetBSD kernels
NetBSD kernels are multiboot ELF kernels with an entry point
incorrectly specified as a virtual address rather than a physical
address.
Work around this by looking for the segment that could plausibly
contain the entry point address (interpreted as either a physical or
virtual address), and using that to determine the eventual physical
entry point.
In the event of any ambiguity, precedence is given to interpretation
of the entry point as a physical address.
[multiboot] Work around raw-flag bug in Solaris kernels
Solaris kernels are multiboot images with the "raw" flag set,
indicating that the loader should use the raw address fields within
the multiboot header rather than looking for an ELF header. However,
the Solaris kernel contains garbage data in the raw address fields,
and requires us to use the ELF header instead.
Work around this by always using the ELF header if present. This
renders the "raw" flag somewhat redundant.
[build] Provide mechanism for listing constituent object sizes
You can now type e.g.
make bin/rtl8139.rom.sizes
in order to see the (uncompressed) sizes of all of the object files
linked in to bin/rtl8139.rom. This should make it easier to identify
relevant code bloat.
[build] Kill off the last multiple-object source file
The build mechanism currently allows for multiple objects per source
file. The only remaining user of this is unnrv2b.S. Replace this
usage with a separate unnrv2b16.S wrapper file, as is currently used
for e.g. pxeprefix.S and kpxeprefix.S.
[build] Provide mechanism for listing per-target source files
You can now type e.g.
make bin/rtl8139.rom.deps
to see a list of the source files included in the build of
bin/rtl8139.rom. This is intended to assist with copyright vetting.
Other new debugging targets include
make bin/rtl8139.rom.objs
to see a list of object files linked in to bin/rtl8139.rom, and
make bin/rtl8139.rom.nodeps
to see a list of the source files that are *not* required for the
build of bin/rtl8139.rom.
[build] Reinstate the .pdsk padded-floppy image format
Some utilities that expect a floppy disk image (e.g. iLO?) may test
for a file of the correct size. Reinstate the .pdsk image format in
order to provide this if needed.
[build] Pad .rom, .dsk, and .hd images to 512-byte boundaries
QEMU will silently round down a disk or ROM image file to the nearest
512 bytes. Fix by always padding .rom, .dsk and .hd images to the
nearest 512-byte boundary.
Originally-fixed-by: Stefan Hajnoczi <stefanha@gmail.com>
This replaces the gdbstub's polite NAK behavior with retransmission of
the current outstanding reply packet. It solves situations where gdb
and gPXE's gdbstub get out of sync due to the lack of flow control in
the gdb protocol spec.
Signed-off-by: Michael Brown <mcb30@etherboot.org>
The zbin compressor fixup utility rounds down file sizes before
calculating their difference. This produces incorrect values and may
cause truncated gPXE images to be loaded at boot.
The following example explains the problem:
ilen = 48 bytes (uncompressed input file)
olen = 17 bytes (compressed output file)
divisor = 16 bytes (paragraph granularity)
fixmeup = 3 paragraphs (value to fix up)
olen / divisor - ilen / divisor
= 1 - 3
= -2 paragraphs (old delta calculation)
( align ( olen, divisor ) - align ( ilen, divisor ) ) / divisor
= 2 - 3
= -1 paragraphs (new delta calculation)
If we perform the SUBx operation with old delta:
fixmeup + -2 = 1 paragraph gets loaded by the prefix
With the new delta:
fixmeup + -1 = 2 paragraphs get loaded by the prefix
The old delta calculation removes the last paragraph; the prefix will
load a truncated copy of gPXE into memory. We need to load 2
paragraphs since olen is 17 bytes. Loading only 1 paragraph (16
bytes) would truncate the last byte.
Signed-off-by: Michael Brown <mcb30@etherboot.org>
[pcbios] Don't use "lret $2" to return from an interrupt
Using "lret $2" to return from an interrupt causes interrupts to be
disabled in the calling program, since the INT instruction will have
disabled interrupts. Instead, patch CF on the stack and use iret to
return.
Interestingly, the original PC BIOS had this bug in at least one
place.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Michael Brown <mcb30@etherboot.org>
The "seq" command is GNU-specific; a BSD userland will not have it.
Use POSIX-conforming "awk" instead.
Reported-by: Joshua Oreman <oremanj@rwcr.net>
Suggested-by: Stefan Hajnoczi <stefanha@gmail.com>
On Mac OS X, it is necessary to build binutils manually; the system
does not provide bfd.h or the libbfd or libiberty libraries.
Originally-fixed-by: Joshua Oreman <oremanj@rwcr.net>
The Mac compiler treats "#pragma pack()" as gcc's "#pragma pack(pop)",
and so dies if the pragma pack stack is empty. Adding a "#pragma
pack(1)" immediately beforehand is enough to keep the Mac compiler
happy.
The combination of "#pragma pack(1)", "#pragma pack()" won't actually
achieve anything on a Mac, but it will at least build. (With gcc, the
"#pragma pack()" overrides any previous pragmas, so is still useful.)
Suggested-by: Joshua Oreman <oremanj@rwcr.net>
[build] Add --divide to ASFLAGS if supported by the assembler
Some builds of the GNU assembler will treat a '/' character as a
comment delimiter. Adding "--divide" will cause it to be treated as a
division operator, as we expect. The "--divide" option is not
available in all gas versions, so apply it only conditionally.
Suggested-by: Joshua Oreman <oremanj@rwcr.net>
[segment] Add "Requested memory not available" error message
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.
[bzimage] Support old (pre-2.00 bootloader) Linux kernel formats
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>
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>
[tables] Incorporate table data type information into table definition
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.
[tables] Redefine methods for accessing linker tables
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.
Michael Brown