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- /*++
- Copyright (c) 2014 Minoca Corp.
- This file is licensed under the terms of the GNU General Public License
- version 3. Alternative licensing terms are available. Contact
- info@minocacorp.com for details. See the LICENSE file at the root of this
- project for complete licensing information.
- Module Name:
- timer.c
- Abstract:
- This module implements platform timer services for BIOS machines.
- Author:
- Evan Green 3-Mar-2014
- Environment:
- Firmware
- --*/
- //
- // ------------------------------------------------------------------- Includes
- //
- #include <minoca/lib/types.h>
- #include <minoca/fw/acpitabs.h>
- #include <uefifw.h>
- #include "biosfw.h"
- //
- // --------------------------------------------------------------------- Macros
- //
- //
- // ---------------------------------------------------------------- Definitions
- //
- //
- // ------------------------------------------------------ Data Type Definitions
- //
- //
- // ----------------------------------------------- Internal Function Prototypes
- //
- UINT64
- EfipPlatformReadTimer (
- VOID
- );
- //
- // -------------------------------------------------------------------- Globals
- //
- //
- // Hold on to the location of the PM timer.
- //
- UINT16 EfiPmTimerPort;
- UINT32 EfiPmTimerBitWidth;
- //
- // ------------------------------------------------------------------ Functions
- //
- EFIAPI
- EFI_STATUS
- EfiPlatformSetWatchdogTimer (
- UINTN Timeout,
- UINT64 WatchdogCode,
- UINTN DataSize,
- CHAR16 *WatchdogData
- )
- /*++
- Routine Description:
- This routine sets the system's watchdog timer.
- Arguments:
- Timeout - Supplies the number of seconds to set the timer for.
- WatchdogCode - Supplies a numeric code to log on a watchdog timeout event.
- DataSize - Supplies the size of the watchdog data.
- WatchdogData - Supplies an optional buffer that includes a null-terminated
- string, optionally followed by additional binary data.
- Return Value:
- EFI_SUCCESS on success.
- EFI_INVALID_PARAMETER if the supplied watchdog code is invalid.
- EFI_UNSUPPORTED if there is no watchdog timer.
- EFI_DEVICE_ERROR if an error occurred accessing the device hardware.
- --*/
- {
- return EFI_UNSUPPORTED;
- }
- EFI_STATUS
- EfiPlatformInitializeTimers (
- UINT32 *ClockTimerInterruptNumber,
- EFI_PLATFORM_SERVICE_TIMER_INTERRUPT *ClockTimerServiceRoutine,
- EFI_PLATFORM_READ_TIMER *ReadTimerRoutine,
- UINT64 *ReadTimerFrequency,
- UINT32 *ReadTimerWidth
- )
- /*++
- Routine Description:
- This routine initializes platform timer services. There are actually two
- different timer services returned in this routine. The periodic timer tick
- provides a periodic interrupt. The read timer provides a free running
- counter value. These are likely serviced by different timers. For the
- periodic timer tick, this routine should start the periodic interrupts
- coming in. The periodic rate of the timer can be anything reasonable, as
- the time counter will be used to count actual duration. The rate should be
- greater than twice the rollover rate of the time counter to ensure proper
- time accounting. Interrupts are disabled at the processor core for the
- duration of this routine.
- Arguments:
- ClockTimerInterruptNumber - Supplies a pointer where the interrupt line
- number of the periodic timer tick will be returned.
- ClockTimerServiceRoutine - Supplies a pointer where a pointer to a routine
- called when the periodic timer tick interrupt occurs will be returned.
- ReadTimerRoutine - Supplies a pointer where a pointer to a routine
- called to read the current timer value will be returned.
- ReadTimerFrequency - Supplies the frequency of the counter.
- ReadTimerWidth - Supplies a pointer where the read timer bit width will be
- returned.
- Return Value:
- EFI Status code.
- --*/
- {
- PFADT Fadt;
- PRSDP Rsdp;
- PRSDT Rsdt;
- ULONG RsdtTableCount;
- PULONG RsdtTableEntry;
- UINTN TableIndex;
- //
- // Find the FADT to figure out where the PM timer is.
- //
- Rsdp = EfiRsdpPointer;
- if (Rsdp == NULL) {
- return EFI_UNSUPPORTED;
- }
- Rsdt = (PRSDT)(UINTN)(Rsdp->RsdtAddress);
- RsdtTableCount = (Rsdt->Header.Length - sizeof(DESCRIPTION_HEADER)) /
- sizeof(ULONG);
- if (RsdtTableCount == 0) {
- return EFI_NOT_FOUND;
- }
- RsdtTableEntry = (PULONG)&(Rsdt->Entries);
- for (TableIndex = 0; TableIndex < RsdtTableCount; TableIndex += 1) {
- Fadt = (PFADT)RsdtTableEntry[TableIndex];
- if (Fadt->Header.Signature == FADT_SIGNATURE) {
- break;
- }
- }
- if (TableIndex == RsdtTableCount) {
- return EFI_NOT_FOUND;
- }
- //
- // Grab the PM timer port and width out of the FADT table.
- //
- EfiPmTimerPort = Fadt->PmTimerBlock;
- if (EfiPmTimerPort == 0) {
- return EFI_UNSUPPORTED;
- }
- EfiPmTimerBitWidth = 24;
- if ((Fadt->Flags & FADT_FLAG_PM_TIMER_32_BITS) != 0) {
- EfiPmTimerBitWidth = 32;
- }
- //
- // Clock interrupts are not supported as the BIOS may have 16-bit real mode
- // interrupts coming in.
- //
- *ClockTimerInterruptNumber = 0;
- *ClockTimerServiceRoutine = NULL;
- *ReadTimerRoutine = EfipPlatformReadTimer;
- *ReadTimerFrequency = PM_TIMER_FREQUENCY;
- *ReadTimerWidth = EfiPmTimerBitWidth;
- return EFI_SUCCESS;
- }
- VOID
- EfiPlatformTerminateTimers (
- VOID
- )
- /*++
- Routine Description:
- This routine terminates timer services in preparation for the termination
- of boot services.
- Arguments:
- None.
- Return Value:
- None.
- --*/
- {
- return;
- }
- //
- // --------------------------------------------------------- Internal Functions
- //
- UINT64
- EfipPlatformReadTimer (
- VOID
- )
- /*++
- Routine Description:
- This routine is called to read the current platform time value. The timer
- is assumed to be free running at a constant frequency, and should have a
- bit width as reported in the initialize function. The UEFI core will
- manage software bit extension out to 64 bits, this routine should just
- reporte the hardware timer value.
- Arguments:
- None.
- Return Value:
- Returns the hardware timer value.
- --*/
- {
- return EfiIoPortIn32(EfiPmTimerPort);
- }
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