diff options
Diffstat (limited to 'docs/specs/acpi_mem_hotplug.txt')
| -rw-r--r-- | docs/specs/acpi_mem_hotplug.txt | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/docs/specs/acpi_mem_hotplug.txt b/docs/specs/acpi_mem_hotplug.txt index 68daa14764..3df3620ce4 100644 --- a/docs/specs/acpi_mem_hotplug.txt +++ b/docs/specs/acpi_mem_hotplug.txt @@ -19,7 +19,9 @@ Memory hot-plug interface (IO port 0xa00-0xa17, 1-4 byte access): 1: Device insert event, used to distinguish device for which no device check event to OSPM was issued. It's valid only when bit 1 is set. - 2-7: reserved and should be ignored by OSPM + 2: Device remove event, used to distinguish device for which + no device eject request to OSPM was issued. + 3-7: reserved and should be ignored by OSPM [0x15-0x17] reserved write access: @@ -38,7 +40,12 @@ Memory hot-plug interface (IO port 0xa00-0xa17, 1-4 byte access): 1: if set to 1 clears device insert event, set by OSPM after it has emitted device check event for the selected memory device - 2-7: reserved, OSPM must clear them before writing to register + 2: if set to 1 clears device remove event, set by OSPM + after it has emitted device eject request for the + selected memory device + 3: if set to 1 initiates device eject, set by OSPM when it + triggers memory device removal and calls _EJ0 method + 4-7: reserved, OSPM must clear them before writing to register Selecting memory device slot beyond present range has no effect on platform: - write accesses to memory hot-plug registers not documented above are |