[smbios] Allow access to unreferenced SMBIOS strings
iPXE allows access to general SMBIOS settings using the syntax:
smbios/<type>.<offset>.<length>
This provides access to any fixed-offset field within an SMBIOS
structure. This syntax is currently overloaded to interpret a zero
<length> as meaning that the byte at <offset> contains a string index;
this provides access to SMBIOS strings (which are not located at fixed
offsets).
The "OEM Strings" SMBIOS structure contains strings which are not
referenced by any fixed string index field within the structure. iPXE
currently provides no way to access these strings.
Fix by overloading the syntax for numerical SMBIOS settings to
interpret an <offset> of zero as implying that <length> contains a
literal string index. The OEM Strings can then be accessed using:
smbios/11.0.1
smbios/11.0.2
smbios/11.0.3
...
The actual byte at offset zero will always contain the structure type,
which is already known since it must be specified in order to access
the structure. There is thus no plausible existing use case for an
offset of zero; overloading the syntax in this way should therefore
not break compatibility with any existing scripts.
The corner case where both <offset> and <length> are zero is undefined
(and, for now, will simply return a "not found" error).
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Create an explicit concept of "settings scope" and eliminate the magic
values used for numerical setting tags.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[netdevice] Add netdev_tx_defer() to allow drivers to defer transmissions
Devices with small transmit descriptor rings may temporarily run out
of space. Provide netdev_tx_defer() to allow drivers to defer packets
for retransmission as soon as a descriptor becomes available.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[realtek] Ensure EEPROM writes reach chip before starting udelay()
On some systems, it appears to be possible for writes to the EEPROM
registers to be delayed for long enough that the EEPROM's setup and
hold times are violated, resulting in invalid data being read from the
EEPROM.
Fix by inserting a PCI read cycle immediately after writes to
RTL_9346CR, to ensure that the write has completed before starting the
udelay() used to time the SPI bus transitions.
Reported-by: Gelip <mrgelip@gmail.com>
Tested-by: Gelip <mrgelip@gmail.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[romprefix] Report failure cause when unable to open payload
Report the cause of the failure when we are unable to open the .mrom
payload. There are two possible failure cases:
- Unable to find a suitable memory BAR to borrow (e.g. if the NIC
doesn't have a memory BAR that is at least as large as the
expansion ROM BAR, or if the memory BAR has been assigned a 64-bit
address which won't fit into the 32-bit expansion ROM BAR). This
will be reported as "BABABABA".
- Unable to find correct ROM image within the BAR. This will be
reported as the address (within the borrowed BAR) at which we first
fail to find a valid 55AA signature.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[realtek] Allow reaction time between writing RTL_CAPR and reading RTL_CR
Some older RTL8139 chips seem to not immediately update the
RTL_CR.BUFE bit in response to a write to RTL_CAPR. This results in
iPXE seeing a spurious zero-length received packet, and thereafter
being out of sync with the hardware's RX ring offset.
Fix by inserting an extra PCI read cycle after writing to RTL_CAPR, to
give the chip time to react before we next read RTL_CR.
Reported-by: Gelip <mrgelip@gmail.com>
Tested-by: Gelip <mrgelip@gmail.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Some onboard RTL8169 NICs seem to leave the EEPROM pins disconnected.
The existing is_valid_ether_addr() test will not necessarily catch
this, since it expects a missing EEPROM to show up as a MAC address of
00:00:00:00:00:00 or ff:ff:ff:ff:ff:ff. When the EEPROM pins are
floating the MAC address may read as e.g. 00:00:00:00:0f:00, which
will not be detected as invalid.
Check the ID word in the first two bytes of the EEPROM (which should
have the value 0x8129 for all RTL8139 and RTL8169 chips), and use this
to determine whether or not an EEPROM is present.
Reported-by: Carl Karsten <carl@nextdayvideo.com>
Tested-by: Carl Karsten <carl@nextdayvideo.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
sparse does not understand -fshort-wchar. Default to using uint16_t
as a wchar_t if not explicitly specified by the compiler, to avoid
large numbers of spurious warnings from sparse.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Linker table entries must be non-static in order to avoid being
completely optimised away by some versions of gcc. Use -Wno-decl to
prevent sparse from warning about these, since the alternative would
be to litter the code with otherwise unnecessary "extern"
declarations.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
sparse does not define __WCHAR_TYPE__ or __WINT_TYPE__. We already
define __WCHAR_TYPE__ if the compiler does not do so; do the same for
__WINT_TYPE__.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
sparse seems to have problems finding compiler.h when specified as
"-include compiler.h"; one possible explanation is that it ignores the
include path. Fix by using "-include include/compiler.h".
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[netdevice] Use link-layer address as part of RNG seed
iPXE currently seeds the random number generator using the system
timer tick count. When large numbers of machines are booted
simultaneously, multiple machines may end up choosing the same DHCP
transaction ID (XID) value; this can cause problems.
Fix by using the least significant (and hence most variable) bits of
each network device's link-layer address to perturb the random number
generator. This introduces some per-machine unique data into the
random number generator's seed, and so reduces the chances of DHCP XID
collisions.
This does not affect the ANS X9.82-compatible random bit generator
used by TLS and other cryptography code, which uses an entirely
separate source of entropy.
Originally-implemented-by: Bernhard Kohl <bernhard.kohl@nsn.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Add disambiguated errors for LoadImage() and StartImage(), primarily
to demonstrate how to use __einfo_uniqify() and __einfo_platformify()
in the context of EFI platform errors.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Exploit the redefinition of iPXE error codes to include a "platform
error code" to allow for meaningful conversion of EFI_STATUS values to
iPXE errors and vice versa.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[libc] Redefine low 8 bits of error code as "platform error code"
The low 8 bits of an iPXE error code are currently defined as the
closest equivalent PXE error code. Generalise this scheme to
platforms other than PC-BIOS by extending this definition to "closest
equivalent platform error code". This allows for the possibility of
returning meaningful errors via EFI APIs.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[intel] Expose functionality to be shared with intelx driver
The Intel 10 Gigabit NICs have a datapath that is almost
register-compatible with the Intel 1 Gigabit NICs. Expose common
functionality to avoid duplication of code in the new "intelx" driver.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[intel] Remove hardcoded offsets for descriptor ring registers
The Intel 10 Gigabit NICs use the same simplified (aka "legacy")
descriptor format and the same layout for descriptor register blocks
as the Intel 1 Gigabit NICs. The offsets of the descriptor register
blocks are not the same.
Simplify reuse of the existing code by removing all hardcoded offsets
for registers within descriptor register blocks, and ensuring that all
offsets are calculated using the descriptor register block base
address provided via intel_init_ring().
Signed-off-by: Michael Brown <mcb30@ipxe.org>
The implementation of INT 10,06 on some BIOSes (observed with both
Hyper-V and a Dell OptiPlex 7010) seems to treat %dx=0xffff as a
special value meaning "do absolutely nothing". Fix by using
%dx=0xfefe, which should still be sufficient to cover any realistic
screen size.
Reported-by: John Clark <skyman@iastate.edu>
Tested-by: John Clark <skyman@iastate.edu>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[settings] Expose build architecture and platform via settings
Expose the build architecture (e.g. "i386" or "x86_64") via
${buildarch} and the firmware platform (e.g. "pcbios" or "efi") via
${platform}. These settings directly expose the ARCH and PLATFORM
variables from the Makefile.
Note that the build architecture reflects the architecture for which
iPXE was compiled, not the architecture on which iPXE is currently
running. The "cpuid" command can be used to detect a 64-bit system at
runtime.
Requested-by: James A. Peltier <jpeltier@sfu.ca>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Avoid using UINT16 and similar typedefs, which are non-standard in the
iPXE codebase and generate conflicts when trying to include any of the
EFI headers.
Also fix trailing whitespace in the affected files, to prevent
complaints from git.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Remove macros which aren't used anywhere in the driver, and which
conflict with macros of the same name used in the EFI headers.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Remove macros which aren't used anywhere in the driver, and which
conflict with macros of the same name used in the EFI headers.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Abstract out the ability to reboot the system to a separate reboot()
function (with platform-specific implementations), add an EFI
implementation, and make the existing "reboot" command available under
EFI.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[dhcp] Use PXE byte ordering for UUID in DHCP option 97
The PXE spec does not specify a byte ordering for UUIDs, but RFC4578
suggests that it follows the EFI spec, in which the first three fields
are little-endian.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[smbios] Mangle UUIDs for SMBIOS version 2.6 and newer
iPXE treats UUIDs as being in network byte order (big-endian). The
SMBIOS specification version 2.6 states that UUIDs are stored with
little-endian values in the first three fields; earlier versions did
not specify an endianness. This results in some inconsistency between
the BIOS, vendor PXE, iPXE, and operating system interpretations of
the SMBIOS UUID.
dmidecode assumes that the byte order is little-endian if and only if
the SMBIOS version is 2.6 or higher. Choose to match this behaviour.
Reported-by: Matthew Helton <mwhelton@gmail.com>
Reported-by: Alexandru Bordei <alexandru.bordei@gmail.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[lkrnprefix] Allow relocation when no initrd is present
Commit 2629b7e ("[pcbios] Inhibit all calls to INT 15,e820 and INT
15,e801 during POST") introduced a regression into .lkrn images when
used with no corresponding initrd.
Specifically, the semantics of the "maximum address for relocation"
value passed to install_prealloc() in %ebp changed so that zero became
a special value meaning "inhibit use of INT 15,e820 and INT 15,e801".
The %ebp value meaing "no upper limit on relocation" was changed from
zero to 0xffffffff, and all prefixes providing fixed values for %ebp
were updated to match the new semantics.
The .lkrn prefix provides the initrd base address as the maximum
address for relocation. When no initrd is present, this address will
be zero, and so will unintentionally trigger the "inhibit INT 15,e820
and INT 15,e801" behaviour.
Fix by explicitly setting %ebp to 0xffffffff if no initrd is present
before calling install_prealloc().
Reported-by: Ján ONDREJ (SAL) <ondrejj@salstar.sk>
Tested-by: Ján ONDREJ (SAL) <ondrejj@salstar.sk>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Newer versions of bfd.h require definitions for the PACKAGE and
PACKAGE_VERSION macros used by autotools. Work around this by
manually defining these macros before including bfd.h.
Originally-fixed-by: Brandon Penglase <bpenglase-ipxe@spaceservices.net>
Tested-by: Brandon Penglase <bpenglase-ipxe@spaceservices.net>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[efi] Add our own EFI_LOAD_FILE_PROTOCOL implementation
When iPXE is used as a UEFI driver, the UEFI PXE base code currently
provides the TCP/IP stack, network protocols, and user interface.
This represents a substantial downgrade from the standard BIOS iPXE
user experience.
Fix by installing our own EFI_LOAD_FILE_PROTOCOL implementation which
initiates the standard iPXE boot procedure. This upgrades the UEFI
iPXE user experience to match the standard BIOS iPXE user experience.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Michael Brown