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123 lines
3.9 KiB
123 lines
3.9 KiB
/*++
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Copyright (c) 1991 - 2001 Microsoft Corporation
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Module Name:
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## # ## ## ##### ### ## ## ## ##
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### # ## ## ## ## ### ### ### ## ##
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#### # ## ## ## ## ## ## ######## ## ##
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# #### #### ##### ## ## # ### ## #######
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# ### #### #### ####### # # ## ## ##
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# ## ## ## ## ## ## # ## ## ## ##
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# # ## ## ## ## ## # ## ## ## ##
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Abstract:
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This header file contains all the global
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definitions for the NVRAM device.
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Author:
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Wesley Witt (wesw) 1-Oct-2001
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Environment:
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Kernel mode only.
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Notes:
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--*/
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/////////////////////////////////////////////////////////////////////
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// By default we assume a power cycle has occurred if the driver
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// has been down for more than DURATION_OF_POWERCYCLE milliseconds.
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// In other words, the "initializing boot" is expected. This is
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// determined if the driver shutdown timestamp is the latest
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// timestamp. If the driver was never shut down (i.e., the last up
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// timestamp is greater than the shutdown timestamp, then the duration
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// is required to be more than two minutes to conclude that there
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// was a power cycle. This is necessary to prevent falsly assuming
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// a power cycle on repeated crashes, and hence potentially entering
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// a cycle whereby an alternative OS is never switched over to.
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//
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// AAN: If we did get a shutdown IRP and we took a timestamp during shutdown
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// (indicated by the fact that the shutdown timestamp is later than the last
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// periodic timestamp) then we use DURATION_OF_POWERCYCLE interval to determine
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// if power has cycled. If the shutdown timestamp wa snot taken (because we did
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// not get a shutdown IRP) then we the DURATION_PWRCYCLE_NOSHUTDOWN interval.
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// The periodic timestamps are taken at half the duration of DURATION_PWRCYCLE_NOSHUTDOWN
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// interval.
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#define DURATION_OF_POWERCYCLE (90*1000) // 90 seconds in milliseconds
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#define DURATION_OF_POWERCYCLE_STRING (L"Duration Powercycle")
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// four minutes in milliseconds
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#define DURATION_PWRCYCLE_NOSHUTDOWN (4*60*1000)
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#define DURATION_PWRCYCLE_NOSHUTDOWN_STRING (L"Duration PwrCycle NoShutDn")
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//#define DURATION_PWRCYCLE_NOSHUTDOWN (10*1000) // test code, for fast testing
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#define NVRAM_MAXIMUM_PARTITIONS 4
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#define NVRAM_RESERVED_BOOTCOUNTER_SLOTS 4
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#define NVRAM_RESERVED_DRIVER_SLOTS 8
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#define NVRAM_MAX_RESERVED_SLOTS (NVRAM_RESERVED_BOOTCOUNTER_SLOTS + NVRAM_RESERVED_DRIVER_SLOTS)
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//
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// Device Extension
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//
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typedef struct _NVRAM_DEVICE_EXTENSION : _DEVICE_EXTENSION {
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SA_NVRAM_CAPS DeviceCaps;
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ULONG PrimaryOS;
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LONGLONG LastStartupTime;
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LONGLONG StartupInterval;
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LONGLONG StartIntNoShutdown;
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LONGLONG ShutdownTime;
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LONGLONG LastUpTime;
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BOOLEAN PowerCycleBoot;
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ULONG SlotPowerCycle; // 1 slot
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ULONG SlotShutDownTime; // 2 slots
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ULONG SlotBootCounter; // 1 slot
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PULONG NvramData;
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} NVRAM_DEVICE_EXTENSION, *PNVRAM_DEVICE_EXTENSION;
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NTSTATUS
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SaNvramDetermineIfPowerCycled(
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IN PNVRAM_DEVICE_EXTENSION DeviceExtension
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);
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NTSTATUS
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SaNvramStartDevice(
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IN PNVRAM_DEVICE_EXTENSION DeviceExtension
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);
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NTSTATUS
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SaNvramDeviceInitialization(
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IN PSAPORT_DRIVER_EXTENSION DriverExtension
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);
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NTSTATUS
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SaNvramIoValidation(
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IN PNVRAM_DEVICE_EXTENSION DeviceExtension,
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IN PIRP Irp,
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PIO_STACK_LOCATION IrpSp
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);
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NTSTATUS
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SaNvramShutdownNotification(
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IN PNVRAM_DEVICE_EXTENSION DeviceExtension,
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IN PIRP Irp,
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PIO_STACK_LOCATION IrpSp
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);
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