ebab9426cd
Fix typos in Documentation/ABI. The changes are in descriptions or comments where they shouldn't affect use of the ABIs. Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Randy Dunlap <rdunlap@infradead.org> Link: https://lore.kernel.org/r/20230814212822.193684-2-helgaas@kernel.org Signed-off-by: Jonathan Corbet <corbet@lwn.net>
1.7 KiB
What: /sys/bus/coreboot Date: August 2022 Contact: Jack Rosenthal jrosenth@chromium.org Description: The coreboot bus provides a variety of virtual devices used to access data structures created by the Coreboot BIOS.
What: /sys/bus/coreboot/devices/cbmem-
Date: August 2022
Contact: Jack Rosenthal jrosenth@chromium.org
Description:
CBMEM is a downwards-growing memory region created by Coreboot,
and contains tagged data structures to be shared with payloads
in the boot process and the OS. Each CBMEM entry is given a
directory in /sys/bus/coreboot/devices based on its id.
A list of ids known to Coreboot can be found in the coreboot
source tree at
src/commonlib/bsd/include/commonlib/bsd/cbmem_id.h.
What: /sys/bus/coreboot/devices/cbmem-/address
Date: August 2022
Contact: Jack Rosenthal jrosenth@chromium.org
Description:
This is the physical memory address that the CBMEM entry's data
begins at, in hexadecimal (e.g., 0x76ffe000).
What: /sys/bus/coreboot/devices/cbmem-/size
Date: August 2022
Contact: Jack Rosenthal jrosenth@chromium.org
Description:
This is the size of the CBMEM entry's data, in hexadecimal
(e.g., 0x1234).
What: /sys/bus/coreboot/devices/cbmem-/mem Date: August 2022 Contact: Jack Rosenthal jrosenth@chromium.org Description: A file exposing read/write access to the entry's data. Note that this file does not support mmap(), as coreboot does not guarantee that the data will be page-aligned.
The mode of this file is 0600. While there shouldn't be
anything security-sensitive contained in CBMEM, read access
requires root privileges given this is exposing a small subset
of physical memory.