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https://github.com/CloverHackyColor/CloverBootloader.git
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201 lines
5.5 KiB
C
201 lines
5.5 KiB
C
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/** @file
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GCC inline implementation of BaseSynchronizationLib processor specific functions.
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Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
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Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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/**
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Performs an atomic increment of an 32-bit unsigned integer.
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Performs an atomic increment of the 32-bit unsigned integer specified by
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Value and returns the incremented value. The increment operation must be
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performed using MP safe mechanisms.
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@param Value A pointer to the 32-bit value to increment.
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@return The incremented value.
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**/
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UINT32
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EFIAPI
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InternalSyncIncrement (
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IN volatile UINT32 *Value
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)
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{
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UINT32 Result;
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__asm__ __volatile__ (
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"movl $1, %%eax \n\t"
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"lock \n\t"
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"xadd %%eax, %1 \n\t"
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"inc %%eax \n\t"
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: "=&a" (Result), // %0
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"+m" (*Value) // %1
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: // no inputs that aren't also outputs
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: "memory",
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"cc"
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);
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return Result;
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}
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/**
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Performs an atomic decrement of an 32-bit unsigned integer.
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Performs an atomic decrement of the 32-bit unsigned integer specified by
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Value and returns the decremented value. The decrement operation must be
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performed using MP safe mechanisms.
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@param Value A pointer to the 32-bit value to decrement.
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@return The decremented value.
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**/
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UINT32
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EFIAPI
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InternalSyncDecrement (
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IN volatile UINT32 *Value
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)
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{
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UINT32 Result;
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__asm__ __volatile__ (
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"movl $-1, %%eax \n\t"
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"lock \n\t"
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"xadd %%eax, %1 \n\t"
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"dec %%eax \n\t"
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: "=&a" (Result), // %0
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"+m" (*Value) // %1
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: // no inputs that aren't also outputs
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: "memory",
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"cc"
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);
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return Result;
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}
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/**
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Performs an atomic compare exchange operation on a 16-bit unsigned integer.
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Performs an atomic compare exchange operation on the 16-bit unsigned integer
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specified by Value. If Value is equal to CompareValue, then Value is set to
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ExchangeValue and CompareValue is returned. If Value is not equal to CompareValue,
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then Value is returned. The compare exchange operation must be performed using
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MP safe mechanisms.
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@param Value A pointer to the 16-bit value for the compare exchange
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operation.
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@param CompareValue 16-bit value used in compare operation.
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@param ExchangeValue 16-bit value used in exchange operation.
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@return The original *Value before exchange.
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**/
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UINT16
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EFIAPI
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InternalSyncCompareExchange16 (
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IN OUT volatile UINT16 *Value,
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IN UINT16 CompareValue,
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IN UINT16 ExchangeValue
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)
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{
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__asm__ __volatile__ (
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"lock \n\t"
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"cmpxchgw %2, %1 \n\t"
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: "+a" (CompareValue), // %0
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"+m" (*Value) // %1
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: "r" (ExchangeValue) // %2
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: "memory",
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"cc"
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);
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return CompareValue;
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}
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/**
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Performs an atomic compare exchange operation on a 32-bit unsigned integer.
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Performs an atomic compare exchange operation on the 32-bit unsigned integer
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specified by Value. If Value is equal to CompareValue, then Value is set to
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ExchangeValue and CompareValue is returned. If Value is not equal to CompareValue,
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then Value is returned. The compare exchange operation must be performed using
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MP safe mechanisms.
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@param Value A pointer to the 32-bit value for the compare exchange
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operation.
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@param CompareValue 32-bit value used in compare operation.
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@param ExchangeValue 32-bit value used in exchange operation.
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@return The original *Value before exchange.
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**/
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UINT32
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EFIAPI
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InternalSyncCompareExchange32 (
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IN OUT volatile UINT32 *Value,
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IN UINT32 CompareValue,
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IN UINT32 ExchangeValue
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)
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{
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__asm__ __volatile__ (
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"lock \n\t"
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"cmpxchgl %2, %1 \n\t"
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: "+a" (CompareValue), // %0
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"+m" (*Value) // %1
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: "r" (ExchangeValue) // %2
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: "memory",
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"cc"
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);
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return CompareValue;
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}
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/**
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Performs an atomic compare exchange operation on a 64-bit unsigned integer.
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Performs an atomic compare exchange operation on the 64-bit unsigned integer specified
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by Value. If Value is equal to CompareValue, then Value is set to ExchangeValue and
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CompareValue is returned. If Value is not equal to CompareValue, then Value is returned.
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The compare exchange operation must be performed using MP safe mechanisms.
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@param Value A pointer to the 64-bit value for the compare exchange
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operation.
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@param CompareValue 64-bit value used in compare operation.
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@param ExchangeValue 64-bit value used in exchange operation.
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@return The original *Value before exchange.
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**/
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UINT64
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EFIAPI
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InternalSyncCompareExchange64 (
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IN OUT volatile UINT64 *Value,
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IN UINT64 CompareValue,
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IN UINT64 ExchangeValue
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)
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{
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__asm__ __volatile__ (
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"lock \n\t"
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"cmpxchgq %2, %1 \n\t"
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: "+a" (CompareValue), // %0
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"+m" (*Value) // %1
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: "r" (ExchangeValue) // %2
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: "memory",
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"cc"
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);
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return CompareValue;
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}
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