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1170 lines
42 KiB
C
1170 lines
42 KiB
C
/** @file
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SMM Periodic SMI Library.
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Copyright (c) 2011 - 2018, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <PiSmm.h>
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#include <Protocol/SmmPeriodicTimerDispatch2.h>
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#include <Library/BaseLib.h>
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#include <Library/BaseMemoryLib.h>
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#include <Library/SynchronizationLib.h>
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#include <Library/DebugLib.h>
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#include <Library/TimerLib.h>
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#include <Library/MemoryAllocationLib.h>
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#include <Library/SmmServicesTableLib.h>
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#include <Library/SmmPeriodicSmiLib.h>
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///
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/// Define the number of periodic SMI handler entries that should be allocated to the list
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/// of free periodic SMI handlers when the list of free periodic SMI handlers is empty.
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///
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#define PERIODIC_SMI_LIBRARY_ALLOCATE_SIZE 0x08
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///
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/// Signature for a PERIODIC_SMI_LIBRARY_HANDLER_CONTEXT structure
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///
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#define PERIODIC_SMI_LIBRARY_HANDLER_CONTEXT_SIGNATURE SIGNATURE_32 ('P', 'S', 'M', 'I')
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///
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/// Structure that contains state information for an enabled periodic SMI handler
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///
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typedef struct {
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///
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/// Signature value that must be set to PERIODIC_SMI_LIBRARY_HANDLER_CONTEXT_SIGNATURE
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///
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UINT32 Signature;
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///
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/// The link entry to be inserted to the list of periodic SMI handlers.
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///
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LIST_ENTRY Link;
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///
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/// The dispatch function to called to invoke an enabled periodic SMI handler.
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///
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PERIODIC_SMI_LIBRARY_HANDLER DispatchFunction;
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///
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/// The context to pass into DispatchFunction
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///
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VOID *Context;
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///
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/// The tick period in 100 ns units that DispatchFunction should be called.
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///
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UINT64 TickPeriod;
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///
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/// The Cpu number that is required to execute DispatchFunction. If Cpu is
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/// set to PERIODIC_SMI_LIBRARY_ANY_CPU, then DispatchFunction may be executed
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/// on any CPU.
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///
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UINTN Cpu;
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///
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/// The size, in bytes, of the stack allocated for a periodic SMI handler.
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/// This value must be a multiple of EFI_PAGE_SIZE.
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///
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UINTN StackSize;
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///
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/// A pointer to the stack allocated using AllocatePages(). This field will
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/// be NULL if StackSize is 0.
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///
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VOID *Stack;
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///
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/// Spin lock used to wait for an AP to complete the execution of a periodic SMI handler
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///
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SPIN_LOCK DispatchLock;
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///
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/// The rate in Hz of the performance counter that is used to measure the
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/// amount of time that a periodic SMI handler executes.
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///
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UINT64 PerfomanceCounterRate;
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///
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/// The start count value of the performance counter that is used to measure
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/// the amount of time that a periodic SMI handler executes.
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///
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UINT64 PerfomanceCounterStartValue;
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///
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/// The end count value of the performance counter that is used to measure
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/// the amount of time that a periodic SMI handler executes.
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///
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UINT64 PerfomanceCounterEndValue;
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///
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/// The context record passed into the Register() function of the SMM Periodic
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/// Timer Dispatch Protocol when a periodic SMI handler is enabled.
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///
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EFI_SMM_PERIODIC_TIMER_REGISTER_CONTEXT RegisterContext;
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///
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/// The handle returned from the Register() function of the SMM Periodic
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/// Timer Dispatch Protocol when a periodic SMI handler is enabled.
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///
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EFI_HANDLE DispatchHandle;
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///
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/// The total number of performance counter ticks that the periodic SMI handler
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/// has been executing in its current invocation.
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///
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UINT64 DispatchTotalTime;
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///
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/// The performance counter value that was captured the last time that the
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/// periodic SMI handler called PeriodcSmiExecutionTime(). This allows the
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/// time value returned by PeriodcSmiExecutionTime() to be accurate even when
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/// the performance counter rolls over.
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///
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UINT64 DispatchCheckPointTime;
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///
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/// Buffer used to save the context when control is transfer from this library
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/// to an enabled periodic SMI handler. This saved context is used when the
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/// periodic SMI handler exits or yields.
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///
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BASE_LIBRARY_JUMP_BUFFER DispatchJumpBuffer;
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///
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/// Flag that is set to TRUE when a periodic SMI handler requests to yield
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/// using PeriodicSmiYield(). When this flag IS TRUE, YieldJumpBuffer is
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/// valid. When this flag is FALSE, YieldJumpBuffer is not valid.
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///
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BOOLEAN YieldFlag;
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///
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/// Buffer used to save the context when a periodic SMI handler requests to
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/// yield using PeriodicSmiYield(). This context is used to resume the
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/// execution of a periodic SMI handler the next time control is transferd
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/// to the periodic SMI handler that yielded.
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///
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BASE_LIBRARY_JUMP_BUFFER YieldJumpBuffer;
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///
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/// The amount of time, in 100 ns units, that have elapsed since the last
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/// time the periodic SMI handler was invoked.
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///
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UINT64 ElapsedTime;
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} PERIODIC_SMI_LIBRARY_HANDLER_CONTEXT;
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/**
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Macro that returns a pointer to a PERIODIC_SMI_LIBRARY_HANDLER_CONTEXT
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structure based on a pointer to a Link field.
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**/
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#define PERIODIC_SMI_LIBRARY_HANDLER_CONTEXT_FROM_LINK(a) \
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CR ( \
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a, \
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PERIODIC_SMI_LIBRARY_HANDLER_CONTEXT, \
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Link, \
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PERIODIC_SMI_LIBRARY_HANDLER_CONTEXT_SIGNATURE \
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)
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///
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/// Pointer to the SMM Periodic Timer Disatch Protocol that was located in the constuctor.
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///
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EFI_SMM_PERIODIC_TIMER_DISPATCH2_PROTOCOL *gSmmPeriodicTimerDispatch2 = NULL;
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///
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/// Pointer to a table of supported periodic SMI tick periods in 100 ns units
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/// sorted from largest to smallest terminated by a tick period value of 0.
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/// This table is allocated using AllocatePool() in the constructor and filled
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/// in based on the values returned from the SMM Periodic Timer Dispatch 2 Protocol
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/// function GetNextShorterInterval().
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///
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UINT64 *gSmiTickPeriodTable = NULL;
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///
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/// Linked list of free periodic SMI handlers that this library can use.
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///
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LIST_ENTRY gFreePeriodicSmiLibraryHandlers =
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INITIALIZE_LIST_HEAD_VARIABLE (gFreePeriodicSmiLibraryHandlers);
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///
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/// Linked list of periodic SMI handlers that this library is currently managing.
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///
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LIST_ENTRY gPeriodicSmiLibraryHandlers =
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INITIALIZE_LIST_HEAD_VARIABLE (gPeriodicSmiLibraryHandlers);
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///
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/// Pointer to the periodic SMI handler that is currently being executed.
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/// Is set to NULL if no periodic SMI handler is currently being executed.
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///
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PERIODIC_SMI_LIBRARY_HANDLER_CONTEXT *gActivePeriodicSmiLibraryHandler = NULL;
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/**
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Internal worker function that returns a pointer to the
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PERIODIC_SMI_LIBRARY_HANDLER_CONTEXT structure associated with the periodic
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SMI handler that is currently being executed. If a periodic SMI handler is
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not currently being executed, the NULL is returned.
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@retval NULL A periodic SMI handler is not currently being executed.
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@retval other Pointer to the PERIODIC_SMI_LIBRARY_HANDLER_CONTEXT
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associated with the active periodic SMI handler.
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**/
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PERIODIC_SMI_LIBRARY_HANDLER_CONTEXT *
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GetActivePeriodicSmiLibraryHandler (
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VOID
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)
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{
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return gActivePeriodicSmiLibraryHandler;
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}
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/**
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Internal worker function that returns a pointer to the
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PERIODIC_SMI_LIBRARY_HANDLER_CONTEXT structure associated with the
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DispatchHandle that was returned when the periodic SMI handler was enabled
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with PeriodicSmiEnable(). If DispatchHandle is NULL, then the active
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periodic SMI handler is returned. If DispatchHandle is NULL and there is
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no active periodic SMI handler, then NULL is returned.
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@param[in] DispatchHandle DispatchHandle that was returned when the periodic
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SMI handler was enabled with PeriodicSmiEnable().
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This is an optional parameter that may be NULL.
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If this parameter is NULL, then the active periodic
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SMI handler is returned.
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@retval NULL DispatchHandle is NULL and there is no active periodic SMI
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handler.
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@retval NULL DispatchHandle does not match any of the periodic SMI handlers
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that have been enabled with PeriodicSmiEnable().
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@retval other Pointer to the PERIODIC_SMI_LIBRARY_HANDLER_CONTEXT
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associated with the DispatchHandle.
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**/
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PERIODIC_SMI_LIBRARY_HANDLER_CONTEXT *
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LookupPeriodicSmiLibraryHandler (
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IN EFI_HANDLE DispatchHandle OPTIONAL
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)
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{
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LIST_ENTRY *Link;
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PERIODIC_SMI_LIBRARY_HANDLER_CONTEXT *PeriodicSmiLibraryHandler;
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//
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// If DispatchHandle is NULL, then return the active periodic SMI handler
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//
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if (DispatchHandle == NULL) {
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return GetActivePeriodicSmiLibraryHandler ();
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}
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//
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// Search the periodic SMI handler entries for a a matching DispatchHandle
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//
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for ( Link = GetFirstNode (&gPeriodicSmiLibraryHandlers)
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; !IsNull (&gPeriodicSmiLibraryHandlers, Link)
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; Link = GetNextNode (&gPeriodicSmiLibraryHandlers, Link)
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) {
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PeriodicSmiLibraryHandler = PERIODIC_SMI_LIBRARY_HANDLER_CONTEXT_FROM_LINK (Link);
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if (PeriodicSmiLibraryHandler->DispatchHandle == DispatchHandle) {
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return PeriodicSmiLibraryHandler;
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}
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}
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//
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// No entries match DispatchHandle, so return NULL
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//
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return NULL;
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}
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/**
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Internal worker function that sets that active periodic SMI handler based on
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the DispatchHandle that was returned when the periodic SMI handler was enabled
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with PeriodicSmiEnable(). If DispatchHandle is NULL, then the
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state is updated to show that there is not active periodic SMI handler.
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A pointer to the active PERIODIC_SMI_LIBRARY_HANDLER_CONTEXT structure
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is returned.
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@param [in] DispatchHandle DispatchHandle that was returned when the periodic
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SMI handler was enabled with PeriodicSmiEnable().
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This is an optional parameter that may be NULL.
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If this parameter is NULL, then the state is updated
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to show that there is not active periodic SMI handler.
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@retval NULL DispatchHandle is NULL.
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@retval other Pointer to the PERIODIC_SMI_LIBRARY_HANDLER_CONTEXT
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associated with DispatchHandle.
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**/
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PERIODIC_SMI_LIBRARY_HANDLER_CONTEXT *
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SetActivePeriodicSmiLibraryHandler (
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IN EFI_HANDLE DispatchHandle OPTIONAL
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)
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{
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if (DispatchHandle == NULL) {
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gActivePeriodicSmiLibraryHandler = NULL;
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} else {
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gActivePeriodicSmiLibraryHandler = LookupPeriodicSmiLibraryHandler (DispatchHandle);
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}
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return gActivePeriodicSmiLibraryHandler;
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}
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/**
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Internal worker function that moves the specified periodic SMI handler from the
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list of managed periodic SMI handlers to the list of free periodic SMI handlers.
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@param[in] PeriodicSmiLibraryHandler Pointer to the periodic SMI handler to be reclaimed.
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**/
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VOID
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ReclaimPeriodicSmiLibraryHandler (
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PERIODIC_SMI_LIBRARY_HANDLER_CONTEXT *PeriodicSmiLibraryHandler
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)
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{
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ASSERT (PeriodicSmiLibraryHandler->DispatchHandle == NULL);
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if (PeriodicSmiLibraryHandler->Stack != NULL) {
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FreePages (
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PeriodicSmiLibraryHandler->Stack,
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EFI_SIZE_TO_PAGES (PeriodicSmiLibraryHandler->StackSize)
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);
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PeriodicSmiLibraryHandler->Stack = NULL;
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}
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RemoveEntryList (&PeriodicSmiLibraryHandler->Link);
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InsertHeadList (&gFreePeriodicSmiLibraryHandlers, &PeriodicSmiLibraryHandler->Link);
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}
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/**
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Add the additional entries to the list of free periodic SMI handlers.
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The function is assumed to be called only when the list of free periodic SMI
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handlers is empty.
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@retval TRUE The additional entries were added.
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@retval FALSE There was no available resource for the additional entries.
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**/
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BOOLEAN
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EnlargeFreePeriodicSmiLibraryHandlerList (
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VOID
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)
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{
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UINTN Index;
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PERIODIC_SMI_LIBRARY_HANDLER_CONTEXT *PeriodicSmiLibraryHandler;
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//
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// Add the entries to the list
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//
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for (Index = 0; Index < PERIODIC_SMI_LIBRARY_ALLOCATE_SIZE; Index++) {
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PeriodicSmiLibraryHandler = AllocatePool (sizeof (PERIODIC_SMI_LIBRARY_HANDLER_CONTEXT));
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if (PeriodicSmiLibraryHandler == NULL) {
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break;
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}
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PeriodicSmiLibraryHandler->Signature = PERIODIC_SMI_LIBRARY_HANDLER_CONTEXT_SIGNATURE;
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InsertHeadList (&gFreePeriodicSmiLibraryHandlers, &PeriodicSmiLibraryHandler->Link);
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}
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return (BOOLEAN) (Index > 0);
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}
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/**
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Internal worker function that returns a free entry for a new periodic
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SMI handler. If no free entries are available, then additional
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entries are allocated.
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@retval NULL There are not enough resources available to to allocate a free entry.
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@retval other Pointer to a free PERIODIC_SMI_LIBRARY_HANDLER_CONTEXT structure.
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**/
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PERIODIC_SMI_LIBRARY_HANDLER_CONTEXT *
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FindFreePeriodicSmiLibraryHandler (
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VOID
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)
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{
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PERIODIC_SMI_LIBRARY_HANDLER_CONTEXT *PeriodicSmiLibraryHandler;
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if (IsListEmpty (&gFreePeriodicSmiLibraryHandlers)) {
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if (!EnlargeFreePeriodicSmiLibraryHandlerList ()) {
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return NULL;
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}
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}
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//
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// Get one from the list of free periodic SMI handlers.
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//
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PeriodicSmiLibraryHandler = PERIODIC_SMI_LIBRARY_HANDLER_CONTEXT_FROM_LINK (
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GetFirstNode (&gFreePeriodicSmiLibraryHandlers)
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);
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RemoveEntryList (&PeriodicSmiLibraryHandler->Link);
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InsertTailList (&gPeriodicSmiLibraryHandlers, &PeriodicSmiLibraryHandler->Link);
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return PeriodicSmiLibraryHandler;
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}
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/**
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This function returns a pointer to a table of supported periodic
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SMI tick periods in 100 ns units sorted from largest to smallest.
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The table contains a array of UINT64 values terminated by a tick
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period value of 0. The returned table must be treated as read-only
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data and must not be freed.
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@return A pointer to a table of UINT64 tick period values in
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100ns units sorted from largest to smallest terminated
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by a tick period of 0.
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**/
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UINT64 *
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EFIAPI
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PeriodicSmiSupportedTickPeriod (
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VOID
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)
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{
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//
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// Return the table allocated and populated by SmmPeriodicSmiLibConstructor()
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//
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return gSmiTickPeriodTable;
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}
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/**
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This function returns the time in 100ns units since the periodic SMI
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handler function was called. If the periodic SMI handler was resumed
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through PeriodicSmiYield(), then the time returned is the time in
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100ns units since PeriodicSmiYield() returned.
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@return The actual time in 100ns units that the periodic SMI handler
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has been executing. If this function is not called from within
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an enabled periodic SMI handler, then 0 is returned.
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**/
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UINT64
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EFIAPI
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PeriodicSmiExecutionTime (
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VOID
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)
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{
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PERIODIC_SMI_LIBRARY_HANDLER_CONTEXT *PeriodicSmiLibraryHandler;
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UINT64 Current;
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UINT64 Count;
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//
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// If there is no active periodic SMI handler, then return 0
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//
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PeriodicSmiLibraryHandler = GetActivePeriodicSmiLibraryHandler ();
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if (PeriodicSmiLibraryHandler == NULL) {
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return 0;
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}
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//
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// Get the current performance counter value
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//
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Current = GetPerformanceCounter ();
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//
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// Count the number of performance counter ticks since the periodic SMI handler
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// was dispatched or the last time this function was called.
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//
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if (PeriodicSmiLibraryHandler->PerfomanceCounterEndValue > PeriodicSmiLibraryHandler->PerfomanceCounterStartValue) {
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//
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// The performance counter counts up. Check for roll over condition.
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//
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if (Current > PeriodicSmiLibraryHandler->DispatchCheckPointTime) {
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Count = Current - PeriodicSmiLibraryHandler->DispatchCheckPointTime;
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} else {
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Count = (Current - PeriodicSmiLibraryHandler->PerfomanceCounterStartValue) + (PeriodicSmiLibraryHandler->PerfomanceCounterEndValue - PeriodicSmiLibraryHandler->DispatchCheckPointTime);
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}
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} else {
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//
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// The performance counter counts down. Check for roll over condition.
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//
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if (PeriodicSmiLibraryHandler->DispatchCheckPointTime > Current) {
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Count = PeriodicSmiLibraryHandler->DispatchCheckPointTime - Current;
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} else {
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Count = (PeriodicSmiLibraryHandler->DispatchCheckPointTime - PeriodicSmiLibraryHandler->PerfomanceCounterEndValue) + (PeriodicSmiLibraryHandler->PerfomanceCounterStartValue - Current);
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}
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}
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//
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// Accumulate the total number of performance counter ticks since the periodic
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// SMI handler was dispatched or resumed.
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//
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PeriodicSmiLibraryHandler->DispatchTotalTime += Count;
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//
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// Update the checkpoint value to the current performance counter value
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//
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PeriodicSmiLibraryHandler->DispatchCheckPointTime = Current;
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//
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// Convert the total number of performance counter ticks to 100 ns units
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//
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return DivU64x64Remainder (
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MultU64x32 (PeriodicSmiLibraryHandler->DispatchTotalTime, 10000000),
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PeriodicSmiLibraryHandler->PerfomanceCounterRate,
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NULL
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);
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}
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/**
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This function returns control back to the SMM Foundation. When the next
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periodic SMI for the currently executing handler is triggered, the periodic
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SMI handler will restarted from its registered DispatchFunction entry point.
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If this function is not called from within an enabled periodic SMI handler,
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then control is returned to the calling function.
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**/
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VOID
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EFIAPI
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PeriodicSmiExit (
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VOID
|
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)
|
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{
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PERIODIC_SMI_LIBRARY_HANDLER_CONTEXT *PeriodicSmiLibraryHandler;
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|
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//
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// If there is no active periodic SMI handler, then return
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//
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PeriodicSmiLibraryHandler = GetActivePeriodicSmiLibraryHandler ();
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if (PeriodicSmiLibraryHandler == NULL) {
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return;
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}
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|
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//
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// Perform a long jump back to the point when the currently executing dispatch
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// function was dispatched.
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//
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|
LongJump (&PeriodicSmiLibraryHandler->DispatchJumpBuffer, 1);
|
|
|
|
//
|
|
// Must never return
|
|
//
|
|
ASSERT (FALSE);
|
|
CpuDeadLoop();
|
|
}
|
|
|
|
/**
|
|
This function yields control back to the SMM Foundation. When the next
|
|
periodic SMI for the currently executing handler is triggered, the periodic
|
|
SMI handler will be resumed and this function will return. Use of this
|
|
function requires a seperate stack for the periodic SMI handler. A non zero
|
|
stack size must be specified in PeriodicSmiEnable() for this function to be
|
|
used.
|
|
|
|
If the stack size passed into PeriodicSmiEnable() was zero, the 0 is returned.
|
|
|
|
If this function is not called from within an enabled periodic SMI handler,
|
|
then 0 is returned.
|
|
|
|
@return The actual time in 100ns units elapsed since this function was
|
|
called. A value of 0 indicates an unknown amount of time.
|
|
|
|
**/
|
|
UINT64
|
|
EFIAPI
|
|
PeriodicSmiYield (
|
|
VOID
|
|
)
|
|
{
|
|
PERIODIC_SMI_LIBRARY_HANDLER_CONTEXT *PeriodicSmiLibraryHandler;
|
|
UINTN SetJumpFlag;
|
|
|
|
//
|
|
// If there is no active periodic SMI handler, then return
|
|
//
|
|
PeriodicSmiLibraryHandler = GetActivePeriodicSmiLibraryHandler ();
|
|
if (PeriodicSmiLibraryHandler == NULL) {
|
|
return 0;
|
|
}
|
|
|
|
//
|
|
// If PeriodicSmiYield() is called without an allocated stack, then just return
|
|
// immediately with an elapsed time of 0.
|
|
//
|
|
if (PeriodicSmiLibraryHandler->Stack == NULL) {
|
|
return 0;
|
|
}
|
|
|
|
//
|
|
// Set a flag so the next periodic SMI event will resume at where SetJump()
|
|
// is called below.
|
|
//
|
|
PeriodicSmiLibraryHandler->YieldFlag = TRUE;
|
|
|
|
//
|
|
// Save context in YieldJumpBuffer
|
|
//
|
|
SetJumpFlag = SetJump (&PeriodicSmiLibraryHandler->YieldJumpBuffer);
|
|
if (SetJumpFlag == 0) {
|
|
//
|
|
// The intial call to SetJump() always returns 0.
|
|
// If this is the initial call, then exit the current periodic SMI handler
|
|
//
|
|
PeriodicSmiExit ();
|
|
}
|
|
|
|
//
|
|
// We get here when a LongJump is performed from PeriodicSmiDispatchFunctionOnCpu()
|
|
// to resume a periodic SMI handler that called PeriodicSmiYield() on the
|
|
// previous time this periodic SMI handler was dispatched.
|
|
//
|
|
// Clear the flag so the next periodic SMI dispatch will not resume.
|
|
//
|
|
PeriodicSmiLibraryHandler->YieldFlag = FALSE;
|
|
|
|
//
|
|
// Return the amount elapsed time that occured while yielded
|
|
//
|
|
return PeriodicSmiLibraryHandler->ElapsedTime;
|
|
}
|
|
|
|
/**
|
|
Internal worker function that transfers control to an enabled periodic SMI
|
|
handler. If the enabled periodic SMI handler was allocated its own stack,
|
|
then this function is called on that allocated stack through the BaseLin
|
|
function SwitchStack().
|
|
|
|
@param[in] Context1 Context1 parameter passed into SwitchStack().
|
|
@param[in] Context2 Context2 parameter passed into SwitchStack().
|
|
|
|
**/
|
|
VOID
|
|
EFIAPI
|
|
PeriodicSmiDispatchFunctionSwitchStack (
|
|
IN VOID *Context1, OPTIONAL
|
|
IN VOID *Context2 OPTIONAL
|
|
)
|
|
{
|
|
PERIODIC_SMI_LIBRARY_HANDLER_CONTEXT *PeriodicSmiLibraryHandler;
|
|
|
|
//
|
|
// Convert Context1 to PERIODIC_SMI_LIBRARY_HANDLER_CONTEXT *
|
|
//
|
|
PeriodicSmiLibraryHandler = (PERIODIC_SMI_LIBRARY_HANDLER_CONTEXT *)Context1;
|
|
|
|
//
|
|
// Dispatch the registered handler passing in the context that was registered
|
|
// and the amount of time that has elapsed since the previous time this
|
|
// periodic SMI handler was dispacthed.
|
|
//
|
|
PeriodicSmiLibraryHandler->DispatchFunction (
|
|
PeriodicSmiLibraryHandler->Context,
|
|
PeriodicSmiLibraryHandler->ElapsedTime
|
|
);
|
|
|
|
//
|
|
// If this DispatchFunction() returns, then unconditially call PeriodicSmiExit()
|
|
// to perform a LongJump() back to PeriodicSmiDispatchFunctionOnCpu(). The
|
|
// LongJump() will resume exection on the original stack.
|
|
//
|
|
PeriodicSmiExit ();
|
|
}
|
|
|
|
/**
|
|
Internal worker function that transfers control to an enabled periodic SMI
|
|
handler on the specified logial CPU. This function determines if the periodic
|
|
SMI handler yielded and needs to be resumed. It also and switches to an
|
|
allocated stack if one was allocated in PeriodicSmiEnable().
|
|
|
|
@param[in] PeriodicSmiLibraryHandler A pointer to the context for the periodic
|
|
SMI handler to execute.
|
|
|
|
**/
|
|
VOID
|
|
EFIAPI
|
|
PeriodicSmiDispatchFunctionOnCpu (
|
|
PERIODIC_SMI_LIBRARY_HANDLER_CONTEXT *PeriodicSmiLibraryHandler
|
|
)
|
|
{
|
|
//
|
|
// Save context in DispatchJumpBuffer. The intial call to SetJump() always
|
|
// returns 0. If this is the initial call, then either resume from a prior
|
|
// call to PeriodicSmiYield() or call the DispatchFunction registerd in
|
|
// PeriodicSmiEnable() using an allocated stack if one was specified.
|
|
//
|
|
if (SetJump (&PeriodicSmiLibraryHandler->DispatchJumpBuffer) != 0) {
|
|
return;
|
|
}
|
|
|
|
//
|
|
// Capture the performance counter value just before the periodic SMI handler
|
|
// is resumed so the amount of time the periodic SMI handler executes can be
|
|
// calculated.
|
|
//
|
|
PeriodicSmiLibraryHandler->DispatchTotalTime = 0;
|
|
PeriodicSmiLibraryHandler->DispatchCheckPointTime = GetPerformanceCounter();
|
|
|
|
if (PeriodicSmiLibraryHandler->YieldFlag) {
|
|
//
|
|
// Perform a long jump back to the point where the previously dispatched
|
|
// function called PeriodicSmiYield().
|
|
//
|
|
LongJump (&PeriodicSmiLibraryHandler->YieldJumpBuffer, 1);
|
|
} else if (PeriodicSmiLibraryHandler->Stack == NULL) {
|
|
//
|
|
// If Stack is NULL then call DispatchFunction using current stack passing
|
|
// in the context that was registered and the amount of time that has
|
|
// elapsed since the previous time this periodic SMI handler was dispacthed.
|
|
//
|
|
PeriodicSmiLibraryHandler->DispatchFunction (
|
|
PeriodicSmiLibraryHandler->Context,
|
|
PeriodicSmiLibraryHandler->ElapsedTime
|
|
);
|
|
|
|
//
|
|
// If this DispatchFunction() returns, then unconditially call PeriodicSmiExit()
|
|
// to perform a LongJump() back to this function.
|
|
//
|
|
PeriodicSmiExit ();
|
|
} else {
|
|
//
|
|
// If Stack is not NULL then call DispatchFunction switching to the allocated stack
|
|
//
|
|
SwitchStack (
|
|
PeriodicSmiDispatchFunctionSwitchStack,
|
|
PeriodicSmiLibraryHandler,
|
|
NULL,
|
|
(UINT8 *)PeriodicSmiLibraryHandler->Stack + PeriodicSmiLibraryHandler->StackSize
|
|
);
|
|
}
|
|
|
|
//
|
|
// Must never return
|
|
//
|
|
ASSERT (FALSE);
|
|
CpuDeadLoop();
|
|
}
|
|
|
|
/**
|
|
Internal worker function that transfers control to an enabled periodic SMI
|
|
handler on the specified logial CPU. This worker function is only called
|
|
using the SMM Services Table function SmmStartupThisAp() to execute the
|
|
periodic SMI handler on a logical CPU that is different than the one that is
|
|
running the SMM Foundation. When the periodic SMI handler returns, a lock is
|
|
released to notify the CPU that is running the SMM Foundation that the periodic
|
|
SMI handler execution has finished its execution.
|
|
|
|
@param[in, out] Buffer A pointer to the context for the periodic SMI handler.
|
|
|
|
**/
|
|
VOID
|
|
EFIAPI
|
|
PeriodicSmiDispatchFunctionWithLock (
|
|
IN OUT VOID *Buffer
|
|
)
|
|
{
|
|
PERIODIC_SMI_LIBRARY_HANDLER_CONTEXT *PeriodicSmiLibraryHandler;
|
|
|
|
//
|
|
// Get context
|
|
//
|
|
PeriodicSmiLibraryHandler = (PERIODIC_SMI_LIBRARY_HANDLER_CONTEXT *)Buffer;
|
|
|
|
//
|
|
// Execute dispatch function on the currently excuting logical CPU
|
|
//
|
|
PeriodicSmiDispatchFunctionOnCpu (PeriodicSmiLibraryHandler);
|
|
|
|
//
|
|
// Release the dispatch spin lock
|
|
//
|
|
ReleaseSpinLock (&PeriodicSmiLibraryHandler->DispatchLock);
|
|
}
|
|
|
|
/**
|
|
Internal worker function that transfers control to a periodic SMI handler that
|
|
was enabled using PeriodicSmiEnable().
|
|
|
|
@param[in] DispatchHandle The unique handle assigned to this handler by
|
|
SmiHandlerRegister().
|
|
@param[in] Context Points to an optional handler context which was
|
|
specified when the handler was registered.
|
|
@param[in, out] CommBuffer A pointer to a collection of data in memory that
|
|
will be conveyed from a non-SMM environment into
|
|
an SMM environment.
|
|
@param[in, out] CommBufferSize The size of the CommBuffer.
|
|
|
|
@retval EFI_SUCCESS The interrupt was handled and quiesced.
|
|
No other handlers should still be called.
|
|
@retval EFI_WARN_INTERRUPT_SOURCE_QUIESCED The interrupt has been quiesced but other
|
|
handlers should still be called.
|
|
@retval EFI_WARN_INTERRUPT_SOURCE_PENDING The interrupt is still pending and other
|
|
handlers should still be called.
|
|
@retval EFI_INTERRUPT_PENDING The interrupt could not be quiesced.
|
|
|
|
**/
|
|
EFI_STATUS
|
|
EFIAPI
|
|
PeriodicSmiDispatchFunction (
|
|
IN EFI_HANDLE DispatchHandle,
|
|
IN CONST VOID *Context OPTIONAL,
|
|
IN OUT VOID *CommBuffer OPTIONAL,
|
|
IN OUT UINTN *CommBufferSize OPTIONAL
|
|
)
|
|
{
|
|
PERIODIC_SMI_LIBRARY_HANDLER_CONTEXT *PeriodicSmiLibraryHandler;
|
|
EFI_SMM_PERIODIC_TIMER_CONTEXT *TimerContext;
|
|
EFI_STATUS Status;
|
|
|
|
//
|
|
// Set the active periodic SMI handler
|
|
//
|
|
PeriodicSmiLibraryHandler = SetActivePeriodicSmiLibraryHandler (DispatchHandle);
|
|
if (PeriodicSmiLibraryHandler == NULL) {
|
|
return EFI_NOT_FOUND;
|
|
}
|
|
|
|
//
|
|
// Retrieve the elapsed time since the last time this periodic SMI handler was called
|
|
//
|
|
PeriodicSmiLibraryHandler->ElapsedTime = 0;
|
|
if (CommBuffer != NULL) {
|
|
TimerContext = (EFI_SMM_PERIODIC_TIMER_CONTEXT *)CommBuffer;
|
|
PeriodicSmiLibraryHandler->ElapsedTime = TimerContext->ElapsedTime;
|
|
}
|
|
|
|
//
|
|
// Dispatch the periodic SMI handler
|
|
//
|
|
if ((PeriodicSmiLibraryHandler->Cpu == PERIODIC_SMI_LIBRARY_ANY_CPU) ||
|
|
(PeriodicSmiLibraryHandler->Cpu == gSmst->CurrentlyExecutingCpu) ) {
|
|
//
|
|
// Dispatch on the currently execution CPU if the CPU specified in PeriodicSmiEnable()
|
|
// was PERIODIC_SMI_LIBARRY_ANY_CPU or the currently executing CPU matches the CPU
|
|
// that was specified in PeriodicSmiEnable().
|
|
//
|
|
PeriodicSmiDispatchFunctionOnCpu (PeriodicSmiLibraryHandler);
|
|
} else {
|
|
//
|
|
// Acquire spin lock for ths periodic SMI handler. The AP will release the
|
|
// spin lock when it is done executing the periodic SMI handler.
|
|
//
|
|
AcquireSpinLock (&PeriodicSmiLibraryHandler->DispatchLock);
|
|
|
|
//
|
|
// Execute the periodic SMI handler on the CPU that was specified in
|
|
// PeriodicSmiEnable().
|
|
//
|
|
Status = gSmst->SmmStartupThisAp (
|
|
PeriodicSmiDispatchFunctionWithLock,
|
|
PeriodicSmiLibraryHandler->Cpu,
|
|
PeriodicSmiLibraryHandler
|
|
);
|
|
if (!EFI_ERROR(Status)) {
|
|
//
|
|
// Wait for the AP to release the spin lock.
|
|
//
|
|
while (!AcquireSpinLockOrFail (&PeriodicSmiLibraryHandler->DispatchLock)) {
|
|
CpuPause ();
|
|
}
|
|
}
|
|
|
|
//
|
|
// Release the spin lock for the periodic SMI handler.
|
|
//
|
|
ReleaseSpinLock (&PeriodicSmiLibraryHandler->DispatchLock);
|
|
}
|
|
|
|
//
|
|
// Reclaim the active periodic SMI handler if it was disabled during the current dispatch.
|
|
//
|
|
if (PeriodicSmiLibraryHandler->DispatchHandle == NULL) {
|
|
ReclaimPeriodicSmiLibraryHandler (PeriodicSmiLibraryHandler);
|
|
}
|
|
|
|
//
|
|
// Update state to show that there is no active periodic SMI handler
|
|
//
|
|
SetActivePeriodicSmiLibraryHandler (NULL);
|
|
|
|
return EFI_SUCCESS;
|
|
}
|
|
|
|
/**
|
|
This function enables a periodic SMI handler.
|
|
|
|
@param[in, out] DispatchHandle A pointer to the handle associated with the
|
|
enabled periodic SMI handler. This is an
|
|
optional parameter that may be NULL. If it is
|
|
NULL, then the handle will not be returned,
|
|
which means that the periodic SMI handler can
|
|
never be disabled.
|
|
@param[in] DispatchFunction A pointer to a periodic SMI handler function.
|
|
@param[in] Context Optional content to pass into DispatchFunction.
|
|
@param[in] TickPeriod The requested tick period in 100ns units that
|
|
control should be givien to the periodic SMI
|
|
handler. Must be one of the supported values
|
|
returned by PeriodicSmiSupportedPickPeriod().
|
|
@param[in] Cpu Specifies the CPU that is required to execute
|
|
the periodic SMI handler. If Cpu is
|
|
PERIODIC_SMI_LIBRARY_ANY_CPU, then the periodic
|
|
SMI handler will always be executed on the SMST
|
|
CurrentlyExecutingCpu, which may vary across
|
|
periodic SMIs. If Cpu is between 0 and the SMST
|
|
NumberOfCpus, then the periodic SMI will always
|
|
be executed on the requested CPU.
|
|
@param[in] StackSize The size, in bytes, of the stack to allocate for
|
|
use by the periodic SMI handler. If 0, then the
|
|
default stack will be used.
|
|
|
|
@retval EFI_INVALID_PARAMETER DispatchFunction is NULL.
|
|
@retval EFI_UNSUPPORTED TickPeriod is not a supported tick period. The
|
|
supported tick periods can be retrieved using
|
|
PeriodicSmiSupportedTickPeriod().
|
|
@retval EFI_INVALID_PARAMETER Cpu is not PERIODIC_SMI_LIBRARY_ANY_CPU or in
|
|
the range 0 to SMST NumberOfCpus.
|
|
@retval EFI_OUT_OF_RESOURCES There are not enough resources to enable the
|
|
periodic SMI handler.
|
|
@retval EFI_OUT_OF_RESOURCES There are not enough resources to allocate the
|
|
stack speficied by StackSize.
|
|
@retval EFI_SUCCESS The periodic SMI handler was enabled.
|
|
|
|
**/
|
|
EFI_STATUS
|
|
EFIAPI
|
|
PeriodicSmiEnable (
|
|
IN OUT EFI_HANDLE *DispatchHandle, OPTIONAL
|
|
IN PERIODIC_SMI_LIBRARY_HANDLER DispatchFunction,
|
|
IN CONST VOID *Context, OPTIONAL
|
|
IN UINT64 TickPeriod,
|
|
IN UINTN Cpu,
|
|
IN UINTN StackSize
|
|
)
|
|
{
|
|
EFI_STATUS Status;
|
|
UINTN Index;
|
|
PERIODIC_SMI_LIBRARY_HANDLER_CONTEXT *PeriodicSmiLibraryHandler;
|
|
|
|
//
|
|
// Make sure all the input parameters are valid
|
|
//
|
|
if (DispatchFunction == NULL) {
|
|
return EFI_INVALID_PARAMETER;
|
|
}
|
|
|
|
for (Index = 0; gSmiTickPeriodTable[Index] != 0; Index++) {
|
|
if (gSmiTickPeriodTable[Index] == TickPeriod) {
|
|
break;
|
|
}
|
|
}
|
|
if (gSmiTickPeriodTable[Index] == 0) {
|
|
return EFI_UNSUPPORTED;
|
|
}
|
|
|
|
if (Cpu != PERIODIC_SMI_LIBRARY_ANY_CPU && Cpu >= gSmst->NumberOfCpus) {
|
|
return EFI_INVALID_PARAMETER;
|
|
}
|
|
|
|
//
|
|
// Find a free periodic SMI handler entry
|
|
//
|
|
PeriodicSmiLibraryHandler = FindFreePeriodicSmiLibraryHandler();
|
|
if (PeriodicSmiLibraryHandler == NULL) {
|
|
return EFI_OUT_OF_RESOURCES;
|
|
}
|
|
|
|
//
|
|
// Initialize a new periodic SMI handler entry
|
|
//
|
|
PeriodicSmiLibraryHandler->YieldFlag = FALSE;
|
|
PeriodicSmiLibraryHandler->DispatchHandle = NULL;
|
|
PeriodicSmiLibraryHandler->DispatchFunction = DispatchFunction;
|
|
PeriodicSmiLibraryHandler->Context = (VOID *)Context;
|
|
PeriodicSmiLibraryHandler->Cpu = Cpu;
|
|
PeriodicSmiLibraryHandler->StackSize = ALIGN_VALUE (StackSize, EFI_PAGE_SIZE);
|
|
if (PeriodicSmiLibraryHandler->StackSize > 0) {
|
|
PeriodicSmiLibraryHandler->Stack = AllocatePages (EFI_SIZE_TO_PAGES (PeriodicSmiLibraryHandler->StackSize));
|
|
if (PeriodicSmiLibraryHandler->Stack == NULL) {
|
|
return EFI_OUT_OF_RESOURCES;
|
|
}
|
|
ZeroMem (PeriodicSmiLibraryHandler->Stack, PeriodicSmiLibraryHandler->StackSize);
|
|
} else {
|
|
PeriodicSmiLibraryHandler->Stack = NULL;
|
|
}
|
|
InitializeSpinLock (&PeriodicSmiLibraryHandler->DispatchLock);
|
|
PeriodicSmiLibraryHandler->PerfomanceCounterRate = GetPerformanceCounterProperties (
|
|
&PeriodicSmiLibraryHandler->PerfomanceCounterStartValue,
|
|
&PeriodicSmiLibraryHandler->PerfomanceCounterEndValue
|
|
);
|
|
PeriodicSmiLibraryHandler->RegisterContext.Period = TickPeriod;
|
|
PeriodicSmiLibraryHandler->RegisterContext.SmiTickInterval = TickPeriod;
|
|
Status = gSmmPeriodicTimerDispatch2->Register (
|
|
gSmmPeriodicTimerDispatch2,
|
|
PeriodicSmiDispatchFunction,
|
|
&PeriodicSmiLibraryHandler->RegisterContext,
|
|
&PeriodicSmiLibraryHandler->DispatchHandle
|
|
);
|
|
if (EFI_ERROR(Status)) {
|
|
PeriodicSmiLibraryHandler->DispatchHandle = NULL;
|
|
ReclaimPeriodicSmiLibraryHandler (PeriodicSmiLibraryHandler);
|
|
return EFI_OUT_OF_RESOURCES;
|
|
}
|
|
|
|
//
|
|
// Return the registered handle if the optional DispatchHandle parameter is not NULL
|
|
//
|
|
if (DispatchHandle != NULL) {
|
|
*DispatchHandle = PeriodicSmiLibraryHandler->DispatchHandle;
|
|
}
|
|
return EFI_SUCCESS;
|
|
}
|
|
|
|
/**
|
|
This function disables a periodic SMI handler that has been previously
|
|
enabled with PeriodicSmiEnable().
|
|
|
|
@param[in] DispatchHandle A handle associated with a previously enabled periodic
|
|
SMI handler. This is an optional parameter that may
|
|
be NULL. If it is NULL, then the active periodic SMI
|
|
handlers is disabled.
|
|
|
|
@retval FALSE DispatchHandle is NULL and there is no active periodic SMI handler.
|
|
@retval FALSE The periodic SMI handler specified by DispatchHandle has
|
|
not been enabled with PeriodicSmiEnable().
|
|
@retval TRUE The periodic SMI handler specified by DispatchHandle has
|
|
been disabled. If DispatchHandle is NULL, then the active
|
|
periodic SMI handler has been disabled.
|
|
|
|
**/
|
|
BOOLEAN
|
|
EFIAPI
|
|
PeriodicSmiDisable (
|
|
IN EFI_HANDLE DispatchHandle OPTIONAL
|
|
)
|
|
{
|
|
PERIODIC_SMI_LIBRARY_HANDLER_CONTEXT *PeriodicSmiLibraryHandler;
|
|
EFI_STATUS Status;
|
|
|
|
//
|
|
// Lookup the periodic SMI handler specified by DispatchHandle
|
|
//
|
|
PeriodicSmiLibraryHandler = LookupPeriodicSmiLibraryHandler (DispatchHandle);
|
|
if (PeriodicSmiLibraryHandler == NULL) {
|
|
return FALSE;
|
|
}
|
|
|
|
//
|
|
// Unregister the periodic SMI handler from the SMM Periodic Timer Dispatch 2 Protocol
|
|
//
|
|
Status = gSmmPeriodicTimerDispatch2->UnRegister (
|
|
gSmmPeriodicTimerDispatch2,
|
|
PeriodicSmiLibraryHandler->DispatchHandle
|
|
);
|
|
if (EFI_ERROR(Status)) {
|
|
return FALSE;
|
|
}
|
|
|
|
//
|
|
// Mark the entry for the disabled periodic SMI handler as free, and
|
|
// call ReclaimPeriodicSmiLibraryHandler to move it to the list of free
|
|
// periodic SMI handlers.
|
|
//
|
|
PeriodicSmiLibraryHandler->DispatchHandle = NULL;
|
|
if (PeriodicSmiLibraryHandler != GetActivePeriodicSmiLibraryHandler ()) {
|
|
ReclaimPeriodicSmiLibraryHandler (PeriodicSmiLibraryHandler);
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/**
|
|
This constructor function caches the pointer to the SMM Periodic Timer
|
|
Dispatch 2 Protocol and collects the list SMI tick rates that the hardware
|
|
supports.
|
|
|
|
@param[in] ImageHandle The firmware allocated handle for the EFI image.
|
|
@param[in] SystemTable A pointer to the EFI System Table.
|
|
|
|
@retval EFI_SUCCESS The constructor always returns EFI_SUCCESS.
|
|
|
|
**/
|
|
EFI_STATUS
|
|
EFIAPI
|
|
SmmPeriodicSmiLibConstructor (
|
|
IN EFI_HANDLE ImageHandle,
|
|
IN EFI_SYSTEM_TABLE *SystemTable
|
|
)
|
|
{
|
|
EFI_STATUS Status;
|
|
UINT64 *SmiTickInterval;
|
|
UINTN Count;
|
|
|
|
//
|
|
// Locate the SMM Periodic Timer Dispatch 2 Protocol
|
|
//
|
|
Status = gSmst->SmmLocateProtocol (
|
|
&gEfiSmmPeriodicTimerDispatch2ProtocolGuid,
|
|
NULL,
|
|
(VOID **)&gSmmPeriodicTimerDispatch2
|
|
);
|
|
ASSERT_EFI_ERROR(Status);
|
|
ASSERT (gSmmPeriodicTimerDispatch2 != NULL);
|
|
|
|
//
|
|
// Count the number of periodic SMI tick intervals that the SMM Periodic Timer
|
|
// Dipatch 2 Protocol supports.
|
|
//
|
|
SmiTickInterval = NULL;
|
|
Count = 0;
|
|
do {
|
|
Status = gSmmPeriodicTimerDispatch2->GetNextShorterInterval (
|
|
gSmmPeriodicTimerDispatch2,
|
|
&SmiTickInterval
|
|
);
|
|
Count++;
|
|
} while (SmiTickInterval != NULL);
|
|
|
|
//
|
|
// Allocate a buffer for the table of supported periodic SMI tick periods.
|
|
//
|
|
gSmiTickPeriodTable = AllocateZeroPool(Count * sizeof (UINT64));
|
|
ASSERT (gSmiTickPeriodTable != NULL);
|
|
|
|
//
|
|
// Fill in the table of supported periodic SMI tick periods.
|
|
//
|
|
SmiTickInterval = NULL;
|
|
Count = 0;
|
|
do {
|
|
gSmiTickPeriodTable[Count] = 0;
|
|
Status = gSmmPeriodicTimerDispatch2->GetNextShorterInterval (
|
|
gSmmPeriodicTimerDispatch2,
|
|
&SmiTickInterval
|
|
);
|
|
if (SmiTickInterval != NULL) {
|
|
gSmiTickPeriodTable[Count] = *SmiTickInterval;
|
|
}
|
|
Count++;
|
|
} while (SmiTickInterval != NULL);
|
|
|
|
//
|
|
// Allocate buffer for initial set of periodic SMI handlers
|
|
//
|
|
EnlargeFreePeriodicSmiLibraryHandlerList ();
|
|
|
|
return EFI_SUCCESS;
|
|
}
|
|
|
|
/**
|
|
The constructor function caches the pointer to the SMM Periodic Timer Dispatch 2
|
|
Protocol and collects the list SMI tick rates that the hardware supports.
|
|
|
|
@param[in] ImageHandle The firmware allocated handle for the EFI image.
|
|
@param[in] SystemTable A pointer to the EFI System Table.
|
|
|
|
@retval EFI_SUCCESS The constructor always returns EFI_SUCCESS.
|
|
|
|
**/
|
|
EFI_STATUS
|
|
EFIAPI
|
|
SmmPeriodicSmiLibDestructor (
|
|
IN EFI_HANDLE ImageHandle,
|
|
IN EFI_SYSTEM_TABLE *SystemTable
|
|
)
|
|
{
|
|
LIST_ENTRY *Link;
|
|
PERIODIC_SMI_LIBRARY_HANDLER_CONTEXT *PeriodicSmiLibraryHandler;
|
|
|
|
//
|
|
// Free the table of supported periodic SMI tick rates
|
|
//
|
|
if (gSmiTickPeriodTable != NULL) {
|
|
FreePool(gSmiTickPeriodTable);
|
|
}
|
|
|
|
//
|
|
// Disable all periodic SMI handlers
|
|
//
|
|
for (Link = GetFirstNode (&gPeriodicSmiLibraryHandlers); !IsNull (&gPeriodicSmiLibraryHandlers, Link);) {
|
|
PeriodicSmiLibraryHandler = PERIODIC_SMI_LIBRARY_HANDLER_CONTEXT_FROM_LINK (Link);
|
|
Link = GetNextNode (&gPeriodicSmiLibraryHandlers, Link);
|
|
PeriodicSmiDisable (PeriodicSmiLibraryHandler->DispatchHandle);
|
|
}
|
|
|
|
//
|
|
// Free all the periodic SMI handler entries
|
|
//
|
|
for (Link = GetFirstNode (&gFreePeriodicSmiLibraryHandlers); !IsNull (&gFreePeriodicSmiLibraryHandlers, Link);) {
|
|
PeriodicSmiLibraryHandler = PERIODIC_SMI_LIBRARY_HANDLER_CONTEXT_FROM_LINK (Link);
|
|
Link = RemoveEntryList (Link);
|
|
FreePool(PeriodicSmiLibraryHandler);
|
|
}
|
|
|
|
return EFI_SUCCESS;
|
|
}
|