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In order to be able to read from and write to model-specific registers, two new modules are added. They are i386 specific, as the cpuid module. rdmsr module registers the command rdmsr that allows reading from a MSR. wrmsr module registers the command wrmsr that allows writing to a MSR. wrmsr module is disabled if UEFI secure boot is enabled. Please note that on SMP systems, interacting with a MSR that has a scope per hardware thread, implies that the value only applies to the particular cpu/core/thread that ran the command. Also, if you specify a reserved or unimplemented MSR address, it will cause a general protection exception (which is not currently being handled) and the system will reboot. Signed-off-by: Jesús Diéguez Fernández <jesusdf@gmail.com> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This is GRUB 2, the second version of the GRand Unified Bootloader. GRUB 2 is rewritten from scratch to make GNU GRUB cleaner, safer, more robust, more powerful, and more portable. See the file NEWS for a description of recent changes to GRUB 2. See the file INSTALL for instructions on how to build and install the GRUB 2 data and program files. Please visit the official web page of GRUB 2, for more information. The URL is <http://www.gnu.org/software/grub/grub.html>. More extensive documentation is available in the Info manual, accessible using 'info grub' after building and installing GRUB 2. There are a number of important user-visible differences from the first version of GRUB, now known as GRUB Legacy. For a summary, please see: info grub Introduction 'Changes from GRUB Legacy'