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Michael Brown
94138656d7
Most TPL manipulation is handled by efi_raise_tpl()/efi_restore_tpl() pairs. The exceptions are the places where we need to temporarily drop to a lower TPL in order to allow a timer interrupt to occur. These currently assume that they are called only from code that is already running at the internal TPL (generally TPL_CALLBACK). This assumption is not always correct. In particular, the call from _efi_start() to efi_driver_reconnect_all() takes place after the SNP devices have been released and so will be running at the external TPL. Create an efi_drop_tpl()/efi_undrop_tpl() pair to abstract away the temporary lowering of the TPL, and ensure that the TPL is always raised back to its original level rather than being unconditionally raised to the internal TPL. Signed-off-by: Michael Brown <mcb30@ipxe.org>
iPXE network bootloader
iPXE is the leading open source network boot firmware. It provides a full PXE implementation enhanced with additional features such as:
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boot from a web server via HTTP or HTTPS,
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boot from an iSCSI, FCoE, or AoE SAN,
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control the boot process with a script,
You can use iPXE to replace the existing PXE ROM on your network card, or you can chainload into iPXE to obtain the features of iPXE without the hassle of reflashing.
iPXE is free, open-source software licensed under the GNU GPL (with some portions under GPL-compatible licences).
You can download the rolling release binaries (built from the latest commit), or use the most recent stable release.
For full documentation, visit the iPXE website.