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8c43227c64
Support RISC-V cache related functions. REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2672 Signed-off-by: Abner Chang <abner.chang@hpe.com> Co-authored-by: Gilbert Chen <gilbert.chen@hpe.com> Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org> Reviewed-by: Zhiguang Liu <zhiguang.liu@intel.com> Reviewed-by: Liming Gao <liming.gao@intel.com> Cc: Michael D Kinney <michael.d.kinney@intel.com> Cc: Liming Gao <liming.gao@intel.com> Cc: Leif Lindholm <leif.lindholm@linaro.org> Cc: Gilbert Chen <gilbert.chen@hpe.com>
79 lines
1.9 KiB
ArmAsm
79 lines
1.9 KiB
ArmAsm
//------------------------------------------------------------------------------
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//
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// RISC-V synchronization functions.
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//
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// Copyright (c) 2020, Hewlett Packard Enterprise Development LP. All rights reserved.<BR>
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//
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// SPDX-License-Identifier: BSD-2-Clause-Patent
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//
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//------------------------------------------------------------------------------
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#include <Base.h>
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.data
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.text
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.align 3
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.global ASM_PFX(InternalSyncCompareExchange32)
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.global ASM_PFX(InternalSyncCompareExchange64)
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.global ASM_PFX(InternalSyncIncrement)
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.global ASM_PFX(InternalSyncDecrement)
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//
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// ompare and xchange a 32-bit value.
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//
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// @param a0 : Pointer to 32-bit value.
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// @param a1 : Compare value.
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// @param a2 : Exchange value.
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//
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ASM_PFX (InternalSyncCompareExchange32):
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lr.w a3, (a0) // Load the value from a0 and make
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// the reservation of address.
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bne a3, a1, exit
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sc.w a3, a2, (a0) // Write the value back to the address.
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mv a3, a1
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exit:
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mv a0, a3
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ret
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.global ASM_PFX(InternalSyncCompareExchange64)
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//
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// Compare and xchange a 64-bit value.
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//
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// @param a0 : Pointer to 64-bit value.
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// @param a1 : Compare value.
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// @param a2 : Exchange value.
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//
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ASM_PFX (SyncCompareExchange64):
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lr.d a3, (a0) // Load the value from a0 and make
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// the reservation of address.
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bne a3, a1, exit
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sc.d a3, a2, (a0) // Write the value back to the address.
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mv a3, a1
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exit2:
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mv a0, a3
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ret
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//
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// Performs an atomic increment of an 32-bit unsigned integer.
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//
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// @param a0 : Pointer to 32-bit value.
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//
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ASM_PFX (InternalSyncIncrement):
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li a1, 1
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amoadd.w a2, a1, (a0)
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mv a0, a2
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ret
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//
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// Performs an atomic decrement of an 32-bit unsigned integer.
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//
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// @param a0 : Pointer to 32-bit value.
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//
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ASM_PFX (InternalSyncDecrement):
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li a1, -1
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amoadd.w a2, a1, (a0)
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mv a0, a2
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ret
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