mirror of
https://github.com/torvalds/linux.git
synced 2024-11-16 09:02:00 +00:00
69ac9cd629
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 <bwalle@suse.de>
Acked-by: Greg KH <gregkh@suse.de>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Cc: kexec@lists.infradead.org
Cc: yhlu.kernel@gmail.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
136 lines
4.8 KiB
Plaintext
136 lines
4.8 KiB
Plaintext
#
|
|
# For a description of the syntax of this configuration file,
|
|
# see Documentation/kbuild/kconfig-language.txt.
|
|
#
|
|
|
|
menu "Firmware Drivers"
|
|
|
|
config EDD
|
|
tristate "BIOS Enhanced Disk Drive calls determine boot disk"
|
|
depends on !IA64
|
|
help
|
|
Say Y or M here if you want to enable BIOS Enhanced Disk Drive
|
|
Services real mode BIOS calls to determine which disk
|
|
BIOS tries boot from. This information is then exported via sysfs.
|
|
|
|
This option is experimental and is known to fail to boot on some
|
|
obscure configurations. Most disk controller BIOS vendors do
|
|
not yet implement this feature.
|
|
|
|
config EDD_OFF
|
|
bool "Sets default behavior for EDD detection to off"
|
|
depends on EDD
|
|
default n
|
|
help
|
|
Say Y if you want EDD disabled by default, even though it is compiled into the
|
|
kernel. Say N if you want EDD enabled by default. EDD can be dynamically set
|
|
using the kernel parameter 'edd={on|skipmbr|off}'.
|
|
|
|
config FIRMWARE_MEMMAP
|
|
bool "Add firmware-provided memory map to sysfs" if EMBEDDED
|
|
default (X86_64 || X86_32)
|
|
help
|
|
Add the firmware-provided (unmodified) memory map to /sys/firmware/memmap.
|
|
That memory map is used for example by kexec to set up parameter area
|
|
for the next kernel, but can also be used for debugging purposes.
|
|
|
|
See also Documentation/ABI/testing/sysfs-firmware-memmap.
|
|
|
|
config EFI_VARS
|
|
tristate "EFI Variable Support via sysfs"
|
|
depends on EFI
|
|
default n
|
|
help
|
|
If you say Y here, you are able to get EFI (Extensible Firmware
|
|
Interface) variable information via sysfs. You may read,
|
|
write, create, and destroy EFI variables through this interface.
|
|
|
|
Note that using this driver in concert with efibootmgr requires
|
|
at least test release version 0.5.0-test3 or later, which is
|
|
available from Matt Domsch's website located at:
|
|
<http://linux.dell.com/efibootmgr/testing/efibootmgr-0.5.0-test3.tar.gz>
|
|
|
|
Subsequent efibootmgr releases may be found at:
|
|
<http://linux.dell.com/efibootmgr>
|
|
|
|
config EFI_PCDP
|
|
bool "Console device selection via EFI PCDP or HCDP table"
|
|
depends on ACPI && EFI && IA64
|
|
default y if IA64
|
|
help
|
|
If your firmware supplies the PCDP table, and you want to
|
|
automatically use the primary console device it describes
|
|
as the Linux console, say Y here.
|
|
|
|
If your firmware supplies the HCDP table, and you want to
|
|
use the first serial port it describes as the Linux console,
|
|
say Y here. If your EFI ConOut path contains only a UART
|
|
device, it will become the console automatically. Otherwise,
|
|
you must specify the "console=hcdp" kernel boot argument.
|
|
|
|
Neither the PCDP nor the HCDP affects naming of serial devices,
|
|
so a serial console may be /dev/ttyS0, /dev/ttyS1, etc, depending
|
|
on how the driver discovers devices.
|
|
|
|
You must also enable the appropriate drivers (serial, VGA, etc.)
|
|
|
|
See <http://www.dig64.org/specifications/DIG64_HCDPv20_042804.pdf>
|
|
|
|
config DELL_RBU
|
|
tristate "BIOS update support for DELL systems via sysfs"
|
|
depends on X86
|
|
select FW_LOADER
|
|
help
|
|
Say m if you want to have the option of updating the BIOS for your
|
|
DELL system. Note you need a Dell OpenManage or Dell Update package (DUP)
|
|
supporting application to communicate with the BIOS regarding the new
|
|
image for the image update to take effect.
|
|
See <file:Documentation/dell_rbu.txt> for more details on the driver.
|
|
|
|
config DCDBAS
|
|
tristate "Dell Systems Management Base Driver"
|
|
depends on X86
|
|
help
|
|
The Dell Systems Management Base Driver provides a sysfs interface
|
|
for systems management software to perform System Management
|
|
Interrupts (SMIs) and Host Control Actions (system power cycle or
|
|
power off after OS shutdown) on certain Dell systems.
|
|
|
|
See <file:Documentation/dcdbas.txt> for more details on the driver
|
|
and the Dell systems on which Dell systems management software makes
|
|
use of this driver.
|
|
|
|
Say Y or M here to enable the driver for use by Dell systems
|
|
management software such as Dell OpenManage.
|
|
|
|
config DMIID
|
|
bool "Export DMI identification via sysfs to userspace"
|
|
depends on DMI
|
|
default y
|
|
help
|
|
Say Y here if you want to query SMBIOS/DMI system identification
|
|
information from userspace through /sys/class/dmi/id/ or if you want
|
|
DMI-based module auto-loading.
|
|
|
|
config ISCSI_IBFT_FIND
|
|
bool "iSCSI Boot Firmware Table Attributes"
|
|
depends on X86
|
|
default n
|
|
help
|
|
This option enables the kernel to find the region of memory
|
|
in which the ISCSI Boot Firmware Table (iBFT) resides. This
|
|
is necessary for iSCSI Boot Firmware Table Attributes module to work
|
|
properly.
|
|
|
|
config ISCSI_IBFT
|
|
tristate "iSCSI Boot Firmware Table Attributes module"
|
|
depends on ISCSI_IBFT_FIND
|
|
default n
|
|
help
|
|
This option enables support for detection and exposing of iSCSI
|
|
Boot Firmware Table (iBFT) via sysfs to userspace. If you wish to
|
|
detect iSCSI boot parameters dynamically during system boot, say Y.
|
|
Otherwise, say N.
|
|
|
|
endmenu
|