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authorDave Young <dyoung@redhat.com>2013-12-20 18:02:17 +0800
committerMatt Fleming <matt.fleming@intel.com>2013-12-21 15:29:36 +0000
commita0998eb15afeffbf52a2c2829318f67df9ac57b8 (patch)
tree5f19084e93f018407d8dfc3521d073250719e67f /Documentation/ABI
parent481f75c043cf44ec11c7fbdbbf37d43463f1e719 (diff)
downloadlinux-a0998eb15afeffbf52a2c2829318f67df9ac57b8.tar.bz2
efi: Export more EFI table variables to sysfs
Export fw_vendor, runtime and config table physical addresses to /sys/firmware/efi/{fw_vendor,runtime,config_table} because kexec kernels need them. From EFI spec these 3 variables will be updated to virtual address after entering virtual mode. But kernel startup code will need the physical address. Signed-off-by: Dave Young <dyoung@redhat.com> Tested-by: Toshi Kani <toshi.kani@hp.com> Signed-off-by: Matt Fleming <matt.fleming@intel.com>
Diffstat (limited to 'Documentation/ABI')
-rw-r--r--Documentation/ABI/testing/sysfs-firmware-efi20
1 files changed, 20 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-firmware-efi b/Documentation/ABI/testing/sysfs-firmware-efi
new file mode 100644
index 000000000000..05874da7ce80
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-firmware-efi
@@ -0,0 +1,20 @@
+What: /sys/firmware/efi/fw_vendor
+Date: December 2013
+Contact: Dave Young <dyoung@redhat.com>
+Description: It shows the physical address of firmware vendor field in the
+ EFI system table.
+Users: Kexec
+
+What: /sys/firmware/efi/runtime
+Date: December 2013
+Contact: Dave Young <dyoung@redhat.com>
+Description: It shows the physical address of runtime service table entry in
+ the EFI system table.
+Users: Kexec
+
+What: /sys/firmware/efi/config_table
+Date: December 2013
+Contact: Dave Young <dyoung@redhat.com>
+Description: It shows the physical address of config table entry in the EFI
+ system table.
+Users: Kexec