Changes in sysfs-firmware-memmap

3b1f9415 - docs: ABI: testing: sysfs-firmware-memmap: add some memmap types.

Wed, 23 Jun 2021 02:31:26 +0000

docs: ABI: testing: sysfs-firmware-memmap: add some memmap types.Compare with arch/x86/kernel/e820.c, types of memmap omitted some. So add.Signed-off-by: Jianpeng Ma Link: https://lore.kernel.org/r/20210623023126.104380-1-jianpeng.ma@intel.comSigned-off-by: Greg Kroah-Hartman List of files: /linux-6.15/Documentation/ABI/testing/sysfs-firmware-memmap

34433332 - docs: ABI: testing: make the files compatible with ReST output

Fri, 30 Oct 2020 07:40:39 +0000

docs: ABI: testing: make the files compatible with ReST outputSome files over there won't parse well by Sphinx.Fix them.Acked-by: Jonathan Cameron # for IIOAcked-by: Fabrice Gasnier Acked-by: Jonathan Corbet Signed-off-by: Mauro Carvalho Chehab Link: https://lore.kernel.org/r/58cf3c2d611e0197fb215652719ebd82ca2658db.1604042072.git.mchehab+huawei@kernel.orgSigned-off-by: Greg Kroah-Hartman List of files: /linux-6.15/Documentation/ABI/testing/sysfs-firmware-memmap

97bef7dd - Bernhard has moved

Wed, 18 Feb 2009 22:48:40 +0000

Bernhard has movedSince I don't work for SUSE any more and the bwalle@suse.de address isinvalid, correct it in the copyright headers and documentation.Signed-off-by: Bernhard Walle Cc: Greg KH Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds List of files: /linux-6.15/Documentation/ABI/testing/sysfs-firmware-memmap

69ac9cd6 - sysfs: add /sys/firmware/memmap

Fri, 27 Jun 2008 11:12:54 +0000

sysfs: add /sys/firmware/memmapThis patch adds /sys/firmware/memmap interface that represents the BIOS(or Firmware) provided memory map. The tree looks like: /sys/firmware/memmap/0/start (hex number) end (hex number) type (string) ... /1/start end typeWith the following shell snippet one can print the memory map in the same formthe kernel prints itself when booting on x86 (the E820 map). --------- 8< -------------------------- #!/bin/sh cd /sys/firmware/memmap for dir in * ; do start=$(cat $dir/start) end=$(cat $dir/end) type=$(cat $dir/type) printf "%016x-%016x (%s)\n" $start $[ $end +1] "$type" done --------- >8 --------------------------That patch only provides the needed interface: 1. The sysfs interface. 2. The structure and enumeration definition. 3. The function firmware_map_add() and firmware_map_add_early() that should be called from architecture code (E820/EFI, for example) to add the contents to the interface.If the kernel is compiled without CONFIG_FIRMWARE_MEMMAP, the interface doesnothing without cluttering the architecture-specific code with #ifdef's.The purpose of the new interface is kexec: While /proc/iomem representsthe *used* memory map (e.g. modified via kernel parameters like 'memmap'and 'mem'), the /sys/firmware/memmap tree represents the unmodified memorymap provided via the firmware. So kexec can: - use the original memory map for rebooting, - use the /proc/iomem for setting up the ELF core headers for kdump case that should only represent the memory of the system.The patch has been tested on i386 and x86_64.Signed-off-by: Bernhard Walle Acked-by: Greg KH Acked-by: Vivek Goyal Cc: kexec@lists.infradead.orgCc: yhlu.kernel@gmail.comSigned-off-by: Ingo Molnar List of files: /linux-6.15/Documentation/ABI/testing/sysfs-firmware-memmap