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 <[email protected]>
Link:

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 <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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

Some files over there won't parse well by Sphinx.

Fix them.

Acked-by: Jonathan Cameron <[email protected]> # for IIO
Acked-

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

Some files over there won't parse well by Sphinx.

Fix them.

Acked-by: Jonathan Cameron <[email protected]> # for IIO
Acked-by: Fabrice Gasnier <[email protected]>
Acked-by: Jonathan Corbet <[email protected]>
Signed-off-by: Mauro Carvalho Chehab <[email protected]>
Link: https://lore.kernel.org/r/58cf3c2d611e0197fb215652719ebd82ca2658db.1604042072.git.mchehab+huawei@kernel.org
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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Bernhard has moved

Since I don't work for SUSE any more and the [email protected] address is
invalid, correct it in the copyright headers and documentation.

Signed-off-by: Bernhard Walle <bernhard.wal

Bernhard has moved

Since I don't work for SUSE any more and the [email protected] address is
invalid, correct it in the copyright headers and documentation.

Signed-off-by: Bernhard Walle <[email protected]>
Cc: Greg KH <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

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sysfs: add /sys/firmware/memmap

This patch adds /sys/firmware/memmap interface that represents the BIOS
(or Firmware) provided memory map. The tree looks like:

/sys/firmware/memmap/0/start (h

sysfs: add /sys/firmware/memmap

This 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
type

With the following shell snippet one can print the memory map in the same form
the 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 does
nothing without cluttering the architecture-specific code with #ifdef's.

The purpose of the new interface is kexec: While /proc/iomem represents
the *used* memory map (e.g. modified via kernel parameters like 'memmap'
and 'mem'), the /sys/firmware/memmap tree represents the unmodified memory
map 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 <[email protected]>
Acked-by: Greg KH <[email protected]>
Acked-by: Vivek Goyal <[email protected]>
Cc: [email protected]
Cc: [email protected]
Signed-off-by: Ingo Molnar <[email protected]>

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