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docs: Document the cutmem command

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The command is not present in the docs/grub.texi user documentation.

Reported-by: Daniel Kiper <daniel.kiper@oracle.com>
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Signed-off-by: Daniel Kiper <daniel.kiper@oracle.com>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
This commit is contained in:
Javier Martinez Canillas 2020-11-07 01:03:18 +01:00 committed by Daniel Kiper
parent 9c5565135f
commit f05e79a014
1 changed files with 21 additions and 0 deletions
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docs/grub.texi
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@ -3981,6 +3981,7 @@ you forget a command, you can run the command @command{help}
* cpuid:: Check for CPU features
* crc:: Compute or check CRC32 checksums
* cryptomount:: Mount a crypto device
* cutmem:: Remove memory regions
* date:: Display or set current date and time
* devicetree:: Load a device tree blob
* distrust:: Remove a pubkey from trusted keys
@ -4139,6 +4140,8 @@ this page is to be filtered. This syntax makes it easy to represent patterns
that are often result of memory damage, due to physical distribution of memory
cells.
The command is similar to @command{cutmem} command.
Note: The command is not allowed when lockdown is enforced (@pxref{Lockdown}).
This prevents removing EFI memory regions to potentially subvert the
security mechanisms provided by the UEFI secure boot.
@ -4303,6 +4306,24 @@ modules (@var{luks}, @var{luks2} and @var{geli}) have to be loaded manually
before this command can be used.
@end deffn
@node cutmem
@subsection cutmem
@deffn Command cutmem from[K|M|G] to[K|M|G]
Remove any memory regions in specified range.
@end deffn
This command notifies the memory manager that specified regions of RAM ought to
be filtered out. This remains in effect after a payload kernel has been loaded
by GRUB, as long as the loaded kernel obtains its memory map from GRUB. Kernels
that support this include Linux, GNU Mach, the kernel of FreeBSD and Multiboot
kernels in general.
The command is similar to @command{badram} command.
Note: The command is not allowed when lockdown is enforced (@pxref{Lockdown}).
This prevents removing EFI memory regions to potentially subvert the
security mechanisms provided by the UEFI secure boot.
@node date
@subsection date