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* [block] Allow SAN boot device to be identified by UUIDMichael Brown2024-03-062-1/+12
| | | | | | | Add a "--uuid" option which may be used to specify a boot device UUID, to be matched against the GPT partition GUID. Signed-off-by: Michael Brown <mcb30@ipxe.org>
* [efi] Add efi_path_guid() utility functionMichael Brown2024-03-062-0/+3
| | | | | | | | | | | EFI provides no API for determining the partition GUID (if any) for a specified device handle. The partition GUID appears to be exposed only as part of the device path. Add efi_path_guid() to extract the partition GUID (if any) from a device path. Signed-off-by: Michael Brown <mcb30@ipxe.org>
* [block] Allow for additional SAN boot parameters alongside filenameMichael Brown2024-03-062-3/+10
| | | | | | | | | | | | | | | The drive specification alone does not necessarily contain enough information to perform a SAN boot (or local disk boot) under UEFI. If the next-stage bootloader is installed in the EFI system partition under a non-standard name (e.g. "\EFI\debian\grubx64.efi") then this explicit boot filename must also be specified. Generalise this concept to use a "SAN boot configuration parameters" structure (currently containing only the optional explicit boot filename), to allow for easy expansion to provide other parameters such as the partition UUID or volume label. Signed-off-by: Michael Brown <mcb30@ipxe.org>
* [efi] Allow booting from local disks via the "sanboot" commandMichael Brown2024-03-051-0/+10
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Extend the EFI SAN boot code to allow for booting from a local disk, as is already possible with the BIOS SAN boot code. There is unfortunately no direct UEFI equivalent of the BIOS drive number. The UEFI shell does provide numbered mappings fs0:, blk0:, etc, but these numberings exist only while the UEFI shell is running and are not necessarily stable between shell invocations or across reboots. A substantial amount of existing third-party documentation for iPXE will suggest using "sanboot --drive 0x80" to boot from a local disk (when no SAN drives are present), since this suggestion has been present in the official documentation for the "sanboot" command for almost thirteen years. We therefore aim to ensure that this instruction will also work for UEFI, i.e. that in a situation where there are local disks but no SAN disks, then the first local disk will be treated as being drive 0x80. We therefore assign local disks the virtual drive numbers 0x80, 0x81, etc, matching the numbering typically used in a BIOS environment. Where a SAN disk is already occupying one of these drive numbers, the local disks' virtual drive numbers will be incremented as necessary. This provides a rough approximation of the equivalent functionality under BIOS, where existing local disks' drive numbers are remapped to make way for SAN disks. We do not make any attempt to sort the list of local disks: the order used for allocating virtual drive numbers will be whatever order is returned by LocateHandle(). This will typically match the creation order of the EFI handles, which will typically match the hardware enumeration order of the devices, which will typically match user expectations as to which local disk is first, second, etc. We explicitly do not attempt to match the numbering used by the UEFI shell (which initially sorts in increasing order of device path, but does not renumber when new devices are added or removed). We can never guarantee matching this partly transient UEFI shell numbering, so it is best not to set any expectation that it will be matched. (Using local drive numbers starting at 0x80 helps to avoid setting up this impossible expectation, since the UEFI shell uses local drive numbers starting at zero.) Since floppy disks are essentially non-existent in any plausible UEFI system, overload "--drive 0" to mean "boot from any drive containing the specified (or default) boot filename". Signed-off-by: Michael Brown <mcb30@ipxe.org>
* [block] Allow for iteration over SAN device list in drive number orderMichael Brown2024-03-051-0/+1
| | | | | | | | Maintain the SAN device list in order of drive number, and provide sandev_next() to locate the first SAN device at or above a given drive number. Signed-off-by: Michael Brown <mcb30@ipxe.org>
* [parseopt] Add parse_uuid() for parsing UUID command-line argumentsMichael Brown2024-02-291-0/+2
| | | | Signed-off-by: Michael Brown <mcb30@ipxe.org>
* [uuid] Add uuid_aton() to parse a UUID from a stringMichael Brown2024-02-293-0/+5
| | | | | | | | | | | | | Add uuid_aton() to parse a UUID value from a string (analogous to inet_aton(), inet6_aton(), sock_aton(), etc), treating it as a 32-digit hex string with optional hyphen separators. The placement of the separators is not checked: each byte within the hex string may be separated by a hyphen, or not separated at all. Add dedicated self-tests for UUID parsing and formatting (already partially covered by the ":uuid" and ":guid" settings self-tests). Signed-off-by: Michael Brown <mcb30@ipxe.org>
* [eap] Add support for the MS-CHAPv2 authentication methodMichael Brown2024-02-232-0/+30
| | | | | | | | | | | | | | | | | | | Add support for EAP-MSCHAPv2 (note that this is not the same as PEAP-MSCHAPv2), controllable via the build configuration option EAP_METHOD_MSCHAPV2 in config/general.h. Our model for EAP does not encompass mutual authentication: we will starting sending plaintext packets (e.g. DHCP requests) over the link even before EAP completes, and our only use for an EAP success is to mark the link as unblocked. We therefore ignore the content of the EAP-MSCHAPv2 success request (containing the MS-CHAPv2 authenticator response) and just send back an EAP-MSCHAPv2 success response, so that the EAP authenticator will complete the process and send through the real EAP success packet (which will, in turn, cause us to unblock the link). Signed-off-by: Michael Brown <mcb30@ipxe.org>
* [eap] Allow MD5-Challenge authentication method to be disabledMichael Brown2024-02-232-0/+3
| | | | | | | | | | | RFC 3748 states that implementations must support the MD5-Challenge method. However, some network environments may wish to disable it as a matter of policy. Allow support for MD5-Challenge to be controllable via the build configuration option EAP_METHOD_MD5 in config/general.h. Signed-off-by: Michael Brown <mcb30@ipxe.org>
* [crypto] Force inlining of trivial wrapper functionsMichael Brown2024-02-221-44/+55
| | | | | | | | | | | Inspection of the generated assembly shows that gcc will often emit standalone implementations of frequently invoked functions such as digest_update(), which contain no logic and exist only as syntactic sugar. Force inlining of these functions to reduce the overall binary size. Signed-off-by: Michael Brown <mcb30@ipxe.org>
* [crypto] Add implementation of MS-CHAPv2 authenticationmschapv2Michael Brown2024-02-221-0/+59
| | | | | | | | Add an implementation of the authentication portions of the MS-CHAPv2 algorithm as defined in RFC 2759, along with the single test vector provided therein. Signed-off-by: Michael Brown <mcb30@ipxe.org>
* [crypto] Allow for multiple cross-signed certificate download attemptsMichael Brown2024-02-151-0/+22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Certificates issued by Let's Encrypt have two options for their chain of trust: the chain can either terminate in the self-signed ISRG Root X1 root certificate, or in an intermediate ISRG Root X1 certificate that is signed in turn by the self-signed DST Root CA X3 root certificate. This is a historical artifact: when Let's Encrypt first launched as a project, the chain ending in DST Root CA X3 was used since existing clients would not have recognised the ISRG Root X1 certificate as a trusted root certificate. The DST Root CA X3 certificate expired in September 2021, and so is no longer trusted by clients (such as iPXE) that validate the expiry times of all certificates in the certificate chain. In order to maintain usability of certificates on older Android devices, the default certificate chain provided by Let's Encrypt still terminates in DST Root CA X3, even though that certificate has now expired. On newer devices which include ISRG Root X1 as a trusted root certificate, the intermediate version of ISRG Root X1 in the certificate chain is ignored and validation is performed as though the chain had terminated in the self-signed ISRG Root X1 root certificate. On older Android devices which do not include ISRG Root X1 as a trusted root certificate, the validation succeeds since Android chooses to ignore expiry times for root certificates and so continues to trust the DST Root CA X3 root certificate. This backwards compatibility hack unfortunately breaks the cross- signing mechanism used by iPXE, which assumes that the certificate chain will always terminate in a non-expired root certificate. Generalise the validator's cross-signed certificate download mechanism to walk up the certificate chain in the event of a failure, attempting to find a replacement cross-signed certificate chain starting from the next level up. This allows the validator to step over the expired (and hence invalidatable) DST Root CA X3 certificate, and instead download the cross-signed version of the ISRG Root X1 certificate. This generalisation also gives us the ability to handle servers that provide a full certificate chain including their root certificate: iPXE will step over the untrusted public root certificate and attempt to find a cross-signed version of it instead. Signed-off-by: Michael Brown <mcb30@ipxe.org>
* [crypto] Add x509_is_self_signed() helper functionMichael Brown2024-02-151-0/+10
| | | | Signed-off-by: Michael Brown <mcb30@ipxe.org>
* [crypto] Add x509_truncate() to truncate a certificate chainMichael Brown2024-02-141-0/+1
| | | | | | | | | | | Downloading a cross-signed certificate chain to partially replace (rather than simply extend) an existing chain will require the ability to discard all certificates after a specified link in the chain. Extract the relevant logic from x509_free_chain() and expose it separately as x509_truncate(). Signed-off-by: Michael Brown <mcb30@ipxe.org>
* [list] Add list_for_each_entry_safe_continue()Michael Brown2024-02-141-0/+16
| | | | Signed-off-by: Michael Brown <mcb30@ipxe.org>
* [list] Add list_is_head_entry()Michael Brown2024-02-141-0/+11
| | | | Signed-off-by: Michael Brown <mcb30@ipxe.org>
* [build] Fix build failures with older versions of gcccentos7Michael Brown2024-02-101-1/+2
| | | | | | | | | | | | Some versions of gcc (observed with gcc 4.8.5 in CentOS 7) will report spurious build_assert() failures for some assertions about structure layouts. There is no clear pattern as to what causes these spurious failures, and the build assertion does succeed in that no unresolvable symbol reference is generated in the compiled code. Adjust the assertions to work around these apparent compiler issues. Signed-off-by: Michael Brown <mcb30@ipxe.org>
* [libc] Allow build_assert() failures to be ignored via NO_WERROR=1Michael Brown2024-02-101-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | We build with -Werror by default so that any warning is treated as an error and aborts the build. The build system allows NO_WERROR=1 to be used to override this behaviour, in order to allow builds to succeed when spurious warnings occur (e.g. when using a newer compiler that includes checks for which the codebase is not yet prepared). Some versions of gcc (observed with gcc 4.8.5 in CentOS 7) will report spurious build_assert() failures: the compilation will fail due to an allegedly unelided call to the build assertion's external function declared with __attribute__((error)) even though the compiler does manage to successfully elide the call (as verified by the fact that there are no unresolvable symbol references in the compiler output). Change build_assert() to declare __attribute__((warning)) instead of __attribute__((error)) on its extern function. This will still abort a normal build if the assertion fails, but may be overridden using NO_WERROR=1 if necessary to work around a spurious assertion failure. Note that if the build assertion has genuinely failed (i.e. if the compiler has genuinely not been able to elide the call) then the object will still contain an unresolvable symbol reference that will cause the link to fail (which matches the behaviour of the old linker_assert() mechanism). Signed-off-by: Michael Brown <mcb30@ipxe.org>
* [crypto] Add implementation of the DES cipherMichael Brown2024-02-072-0/+92
| | | | | | | | | | | | | | The DES block cipher dates back to the 1970s. It is no longer relevant for use in TLS cipher suites, but it is still used by the MS-CHAPv2 authentication protocol which remains unfortunately common for 802.1x port authentication. Add an implementation of the DES block cipher, complete with the extremely comprehensive test vectors published by NBS (the precursor to NIST) in the form of an utterly adorable typewritten and hand-drawn paper document. Signed-off-by: Michael Brown <mcb30@ipxe.org>
* [crypto] Fix stray references to AESMichael Brown2024-02-021-3/+3
| | | | | | | | | | The CBC_CIPHER() macro contains some accidentally hardcoded references to an underlying AES cipher, instead of using the cipher specified in the macro parameters. Fix by using the macro parameter as required. Signed-off-by: Michael Brown <mcb30@ipxe.org>
* [tls] Add ECDHE cipher suitesMichael Brown2024-01-311-0/+6
| | | | | | | Add ECDHE variants of the existing cipher suites, and lower the priority of the non-ECDHE variants. Signed-off-by: Michael Brown <mcb30@ipxe.org>
* [crypto] Add X25519 OID-identified algorithm and TLS named curveMichael Brown2024-01-301-0/+7
| | | | Signed-off-by: Michael Brown <mcb30@ipxe.org>
* [tls] Add support for Ephemeral Elliptic Curve Diffie-Hellman key exchangeMichael Brown2024-01-301-0/+24
| | | | | | | Add support for the Ephemeral Elliptic Curve Diffie-Hellman (ECDHE) key exchange algorithm. Signed-off-by: Michael Brown <mcb30@ipxe.org>
* [crypto] Add an abstraction of an elliptic curveMichael Brown2024-01-302-0/+26
| | | | | | | Define an abstraction of an elliptic curve with a fixed generator and one supported operation (scalar multiplication of a curve point). Signed-off-by: Michael Brown <mcb30@ipxe.org>
* [crypto] Check for all-zeros result from X25519 key exchangeMichael Brown2024-01-302-3/+4
| | | | | | | | | | | | | RFC7748 states that it is entirely optional for X25519 Diffie-Hellman implementations to check whether or not the result is the all-zero value (indicating that an attacker sent a malicious public key with a small order). RFC8422 states that implementations in TLS must abort the handshake if the all-zero value is obtained. Return an error if the all-zero value is obtained, so that the TLS code will not require knowledge specific to the X25519 curve. Signed-off-by: Michael Brown <mcb30@ipxe.org>
* [crypto] Add X25519 key exchange algorithmMichael Brown2024-01-191-0/+91
| | | | | | | | | | | | | | | | | Add an implementation of the X25519 key exchange algorithm as defined in RFC7748. This implementation is inspired by and partially based upon the paper "Implementing Curve25519/X25519: A Tutorial on Elliptic Curve Cryptography" by Martin Kleppmann, available for download from https://www.cl.cam.ac.uk/teaching/2122/Crypto/curve25519.pdf The underlying modular addition, subtraction, and multiplication operations are completely redesigned for substantially improved efficiency compared to the TweetNaCl implementation studied in that paper (approximately 5x-10x faster and with 70% less memory usage). Signed-off-by: Michael Brown <mcb30@ipxe.org>
* [crypto] Add bigint_swap() to conditionally swap big integersMichael Brown2024-01-191-0/+15
| | | | | | | Add a helper function bigint_swap() that can be used to conditionally swap a pair of big integers in constant time. Signed-off-by: Michael Brown <mcb30@ipxe.org>
* [crypto] Add bigint_copy() as a convenient wrapper macroMichael Brown2024-01-191-0/+13
| | | | | | | | | | | Big integers may be efficiently copied using bigint_shrink() (which will always copy only the size of the destination integer), but this is potentially confusing to a reader of the code. Provide bigint_copy() as an alias for bigint_shrink() so that the intention of the calling code may be more obvious. Signed-off-by: Michael Brown <mcb30@ipxe.org>
* [crypto] Allow multiplicand and multiplier to differ in sizeMichael Brown2024-01-161-5/+7
| | | | | | | | | | | Big integer multiplication is currently used only as part of modular exponentiation, where both multiplicand and multiplier will be the same size. Relax this requirement to allow for the use of big integer multiplication in other contexts. Signed-off-by: Michael Brown <mcb30@ipxe.org>
* [libc] Replace linker_assert() with build_assert()Michael Brown2024-01-164-45/+36
| | | | | | | | | | | | | | | | | | | | | | | We currently implement build-time assertions via a mechanism that generates a call to an undefined external function that will cause the link to fail unless the compiler can prove that the asserted condition is true (and thereby eliminate the undefined function call). This assertion mechanism can be used for conditions that are not amenable to the use of static_assert(), since static_assert() will not allow for proofs via dead code elimination. Add __attribute__((error(...))) to the undefined external function, so that the error is raised at compile time rather than at link time. This allows us to provide a more meaningful error message (which will include the file name and line number, as with any other compile-time error), and avoids the need for the caller to specify a unique symbol name for the external function. Change the name from linker_assert() to build_assert(), since the assertion now takes place at compile time rather than at link time. Signed-off-by: Michael Brown <mcb30@ipxe.org>
* [libc] Make static_assert() available via assert.hassertMichael Brown2024-01-161-0/+9
| | | | | | | Expose static_assert() via assert.h and migrate link-time assertions to build-time assertions where possible. Signed-off-by: Michael Brown <mcb30@ipxe.org>
* [eap] Add support for the MD5-Challenge authentication typeMichael Brown2024-01-101-0/+11
| | | | | | | | | RFC 3748 states that support for MD5-Challenge is mandatory for EAP implementations. The MD5 and CHAP code is already included in the default build since it is required by iSCSI, and so this does not substantially increase the binary size. Signed-off-by: Michael Brown <mcb30@ipxe.org>
* [eap] Add support for sending an EAP identityMichael Brown2024-01-101-5/+40
| | | | | | | | | | | | | Allow the ${netX/username} setting to be used to specify an EAP identity to be returned in response to a Request-Identity, and provide a mechanism for responding with a NAK to indicate which authentication types we support. If no identity is specified then fall back to the current behaviour of not sending any Request-Identity response, so that switches will time out and switch to MAC Authentication Bypass (MAB) if applicable. Signed-off-by: Michael Brown <mcb30@ipxe.org>
* [eap] Ignore any received EAP responsesMichael Brown2024-01-101-0/+3
| | | | | | | EAP responses (including our own) may be broadcast by switches but are not of interest to us and can be safely ignored if received. Signed-off-by: Michael Brown <mcb30@ipxe.org>
* [smbios] Support scanning for the 64-bit SMBIOS3 entry pointMichael Brown2023-12-291-0/+2
| | | | | | | | | | Support scanning for the 64-bit SMBIOS3 entry point in addition to the 32-bit SMBIOS2 entry point. Prefer use of the 32-bit entry point if present, since this is guaranteed to be within accessible memory. Signed-off-by: Michael Brown <mcb30@ipxe.org>
* [efi] Fix dependency list construction in EDK2 header import scriptMichael Brown2023-11-241-1/+1
| | | | Signed-off-by: Michael Brown <mcb30@ipxe.org>
* [efi] Update to current EDK2 headersMichael Brown2023-11-226-26/+65
| | | | Signed-off-by: Michael Brown <mcb30@ipxe.org>
* [eapol] Limit number of EAPoL-Start packets transmitted per attemptMichael Brown2023-11-071-0/+5
| | | | Signed-off-by: Michael Brown <mcb30@ipxe.org>
* [eapol] Delay EAPoL-Start while waiting for EAP to completeMichael Brown2023-11-071-3/+38
| | | | | | | | | | | | | | | | EAP exchanges may take a long time to reach a final status, especially when relying upon MAC Authentication Bypass (MAB). Our current behaviour of sending EAPoL-Start every few seconds until a final status is obtained can prevent these exchanges from ever completing. Fix by redefining the EAP supplicant state to allow EAPoL-Start to be suppressed: either temporarily (while waiting for a full EAP exchange to complete, in which case we need to eventually resend EAPoL-Start if the final Success or Failure packet is lost), or permanently (while waiting for the potentially very long MAC Authentication Bypass timeout period). Signed-off-by: Michael Brown <mcb30@ipxe.org>
* [pci] Cache ECAM mapping errorsMichael Brown2023-11-021-0/+2
| | | | | | | | | When an error occurs during ECAM configuration space mapping, preserve the error within the existing cached mapping (instead of invalidating the cached mapping) in order to avoid flooding the debug log with repeated identical mapping errors. Signed-off-by: Michael Brown <mcb30@ipxe.org>
* [eapol] Send EAPoL-Start packets to trigger EAP authenticationsupplicantMichael Brown2023-09-191-0/+8
| | | | | | | | | | | | | | | | | | | | | | We have no way to force a link-layer restart in iPXE, and therefore no way to explicitly trigger a restart of EAP authentication. If an iPXE script has performed some action that requires such a restart (e.g. registering a device such that the port VLAN assignment will be changed), then the only means currently available to effect the restart is to reboot the whole system. If iPXE is taking over a physical link already used by a preceding bootloader, then even a reboot may not work. In the EAP model, the supplicant is a pure responder and never initiates transmissions. EAPoL extends this to include an EAPoL-Start packet type that may be sent by the supplicant to (re)trigger EAP. Add support for sending EAPoL-Start packets at two-second intervals on links that are open and have reached physical link-up, but for which EAP has not yet completed. This allows "ifclose ; ifopen" to be used to restart the EAP process. Signed-off-by: Michael Brown <mcb30@ipxe.org>
* [eap] Define a supplicant model for EAP and EAPoLMichael Brown2023-09-182-4/+30
| | | | | | | | Extend the EAP model to include a record of whether or not EAP authentication has completed (successfully or otherwise), and to provide a method for transmitting EAP responses. Signed-off-by: Michael Brown <mcb30@ipxe.org>
* [netdevice] Allocate private data for each network upper-layer driverMichael Brown2023-09-131-3/+10
| | | | | | | | | | | | | | | | | Allow network upper-layer drivers (such as LLDP, which attaches to each network device in order to provide a corresponding LLDP settings block) to specify a size for private data, which will be allocated as part of the network device structure (as with the existing private data allocated for the underlying device driver). This will allow network upper-layer drivers to be simplified by omitting memory allocation and freeing code. If the upper-layer driver requires a reference counter (e.g. for interface initialisation), then it may use the network device's existing reference counter, since this is now the reference counter for the containing block of memory. Signed-off-by: Michael Brown <mcb30@ipxe.org>
* [netdevice] Remove netdev_priv() helper functionMichael Brown2023-09-131-11/+0
| | | | | | | | | | Some network device drivers use the trivial netdev_priv() helper function while others use the netdev->priv pointer directly. Standardise on direct use of netdev->priv, in order to free up the function name netdev_priv() for reuse. Signed-off-by: Michael Brown <mcb30@ipxe.org>
* [ntp] Define NTP server settingMichael Brown2023-07-191-0/+3
| | | | | | | | | | | Define the IPv4 NTP server setting to simplify the use of a DHCP-provided NTP server in scripts, using e.g. #!ipxe dhcp ntp ${ntp} Signed-off-by: Michael Brown <mcb30@ipxe.org>
* [console] Restore compatibility with "--key" values in existing scriptsMichael Brown2023-07-072-2/+17
| | | | | | | | | | | | | | | | Commit 3ef4f7e ("[console] Avoid overlap between special keys and Unicode characters") renumbered the special key encoding to avoid collisions with Unicode key values outside the ASCII range. This change broke backwards compatibility with existing scripts that specify key values using e.g. "prompt --key" or "menu --key". Restore compatibility with existing scripts by tweaking the special key encoding so that the relative key value (i.e. the delta from KEY_MIN) is numerically equal to the old pre-Unicode key value, and by modifying parse_key() to accept a relative key value. Reported-by: Sven Dreyer <sven@dreyer-net.de> Signed-off-by: Michael Brown <mcb30@ipxe.org>
* [interface] Fix debug message values for temporary interfacestmpintfMichael Brown2023-07-041-16/+56
| | | | | | | | | | | | | | | The interface debug message values constructed by INTF_DBG() et al rely on the interface being embedded within a containing object. This assumption is not valid for the temporary outbound-only interfaces constructed on the stack by intf_shutdown() and xfer_vredirect(). Formalise the notion of a temporary outbound-only interface as having a NULL interface descriptor, and overload the "original interface descriptor" field to contain a pointer to the original interface that the temporary interface is shadowing. Originally-fixed-by: Vincent Fazio <vfazio@gmail.com> Signed-off-by: Michael Brown <mcb30@ipxe.org>
* [console] Avoid overlap between special keys and Unicode charactersMichael Brown2023-07-041-5/+40
| | | | | | | | | | | | | | The special key range (from KEY_MIN upwards) currently overlaps with the valid range for Unicode characters, and therefore prohibits the use of Unicode key values outside the ASCII range. Create space for Unicode key values by moving the special keys to the range immediately above the maximum valid Unicode character. This allows the existing encoding of special keys as an efficiently packed representation of the equivalent ANSI escape sequence to be maintained almost as-is. Signed-off-by: Michael Brown <mcb30@ipxe.org>
* [console] Avoid overlap between remapping flags and character valuesMichael Brown2023-07-041-4/+4
| | | | | | | | | | | | | | | | | | | The keyboard remapping flags currently occupy bits 8 and upwards of the to-be-mapped character value. This overlaps the range used for special keys (KEY_MIN and upwards) and also overlaps the valid Unicode character range. No conflict is created by this overlap, since by design only ASCII character values (as generated by an ASCII-only keyboard driver) are subject to remapping, and so the to-be-remapped character values exist in a conceptually separate namespace from either special keys or non-ASCII Unicode characters. However, the overlap is potentially confusing for readers of the code. Minimise cognitive load by using bits 24 and upwards for the keyboard remapping flags. Signed-off-by: Michael Brown <mcb30@ipxe.org>
* [ioapi] Centralise definitions for dummy PIOMichael Brown2023-06-291-0/+64
| | | | | | | | | | There is no common standard for I/O-space access for non-x86 CPU families, and non-MMIO peripherals are vanishingly rare. Generalise the existing ARM definitions for dummy PIO to allow for reuse by other CPU architectures. Signed-off-by: Michael Brown <mcb30@ipxe.org>
generated by cgit (git 2.34.1) at 2025-02-24 02:38:21 +0000