mirror of https://github.com/acidanthera/audk.git
93 lines
2.2 KiB
C
93 lines
2.2 KiB
C
/** @file
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Provides CPU architecture specific functions that can not be defined
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in the Base Library due to dependencies on the PAL Library
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The CPU Library provides services to flush CPU TLBs and place the CPU in a sleep state.
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The implementation of these services on Itanium processors requires the use of PAL Calls.
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PAL Calls require PEI and DXE specific mechanisms to look up PAL Entry Point.
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As a result, these services could not be defined in the Base Library.
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Copyright (c) 2006 - 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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#ifndef __CPU_LIB_H__
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#define __CPU_LIB_H__
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/**
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Places the CPU in a sleep state until an interrupt is received.
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Places the CPU in a sleep state until an interrupt is received. If interrupts
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are disabled prior to calling this function, then the CPU will be placed in a
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sleep state indefinitely.
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**/
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VOID
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EFIAPI
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CpuSleep (
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VOID
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);
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/**
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Flushes all the Translation Lookaside Buffers(TLB) entries in a CPU.
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Flushes all the Translation Lookaside Buffers(TLB) entries in a CPU.
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**/
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VOID
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EFIAPI
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CpuFlushTlb (
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VOID
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);
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#if defined (MDE_CPU_IA32) || defined (MDE_CPU_X64)
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/**
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Initializes floating point units for requirement of UEFI specification.
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This function initializes floating-point control word to 0x027F (all exceptions
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masked,double-precision, round-to-nearest) and multimedia-extensions control word
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(if supported) to 0x1F80 (all exceptions masked, round-to-nearest, flush to zero
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for masked underflow).
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**/
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VOID
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EFIAPI
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InitializeFloatingPointUnits (
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VOID
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);
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/**
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Determine if the standard CPU signature is "AuthenticAMD".
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@retval TRUE The CPU signature matches.
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@retval FALSE The CPU signature does not match.
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**/
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BOOLEAN
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EFIAPI
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StandardSignatureIsAuthenticAMD (
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VOID
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);
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/**
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Return the 32bit CPU family and model value.
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@return CPUID[01h].EAX with Processor Type and Stepping ID cleared.
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**/
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UINT32
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EFIAPI
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GetCpuFamilyModel (
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VOID
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);
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/**
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Return the CPU stepping ID.
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@return CPU stepping ID value in CPUID[01h].EAX.
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**/
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UINT8
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EFIAPI
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GetCpuSteppingId (
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VOID
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);
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#endif
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#endif
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