proxmox-mirrors/grub2
1
0
Fork 0
mirror of https://git.proxmox.com/git/grub2 synced 2025-07-26 05:15:29 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

docs: Document the cutmem command

Browse Source 
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
docs/grub.texi
View File

@ -3981,6 +3981,7 @@ you forget a command, you can run the command @command{help}
* cpuid:: Check for CPU features * cpuid:: Check for CPU features
* crc:: Compute or check CRC32 checksums * crc:: Compute or check CRC32 checksums
* cryptomount:: Mount a crypto device * cryptomount:: Mount a crypto device
* cutmem:: Remove memory regions
* date:: Display or set current date and time * date:: Display or set current date and time
* devicetree:: Load a device tree blob * devicetree:: Load a device tree blob
* distrust:: Remove a pubkey from trusted keys * 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 that are often result of memory damage, due to physical distribution of memory
cells. cells.
The command is similar to @command{cutmem} command.
Note: The command is not allowed when lockdown is enforced (@pxref{Lockdown}). Note: The command is not allowed when lockdown is enforced (@pxref{Lockdown}).
This prevents removing EFI memory regions to potentially subvert the This prevents removing EFI memory regions to potentially subvert the
security mechanisms provided by the UEFI secure boot. 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. before this command can be used.
@end deffn @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 @node date
@subsection date @subsection date