[librm] Preserve CR4 across virt_call() if FXSR is supported Setting the CR4.OSFXSR flag is a prerequisite for using the AES-NI instructions for AES hardware acceleration: if this flag is not set then the CPU will raise an undefined-instruction exception. We currently preserve CR4 across virt_call() only for 64-bit builds, since those will modify CR4 by setting CR4.PAE. Extend this to preserve CR4 across virt_call() if FXSR is supported, to allow the CR4.OSFXSR flag to be modified as needed. Signed-off-by: Michael Brown <mcb30@ipxe.org>
iPXE is the leading open source network boot firmware. It provides a full PXE implementation enhanced with additional features such as:
boot from a web server via HTTP or HTTPS,
boot from an iSCSI, FCoE, or AoE SAN,
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.
