diff options
| author |   Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com> | 2023-10-10 14:33:42 +0000 |
|---|---|---|
| committer | Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com> | 2023-10-10 14:33:42 +0000 |
| commit | af1a266670d040d2f4083ff309d732d648afba2a (patch) | |
| tree | 2fc46203448ddcc6f81546d379abfaeb323575e9 /roms/edk2/MdePkg/Library/BaseSynchronizationLib/RiscV64 | |
| parent | e02cda008591317b1625707ff8e115a4841aa889 (diff) | |
Change-Id: Iaf8d18082d3991dec7c0ebbea540f092188eb4ec
Diffstat (limited to 'roms/edk2/MdePkg/Library/BaseSynchronizationLib/RiscV64')
| -rw-r--r-- | roms/edk2/MdePkg/Library/BaseSynchronizationLib/RiscV64/Synchronization.S | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/roms/edk2/MdePkg/Library/BaseSynchronizationLib/RiscV64/Synchronization.S b/roms/edk2/MdePkg/Library/BaseSynchronizationLib/RiscV64/Synchronization.S new file mode 100644 index 000000000..bac80d687 --- /dev/null +++ b/roms/edk2/MdePkg/Library/BaseSynchronizationLib/RiscV64/Synchronization.S @@ -0,0 +1,78 @@ +//------------------------------------------------------------------------------
+//
+// RISC-V synchronization functions.
+//
+// Copyright (c) 2020, Hewlett Packard Enterprise Development LP. All rights reserved.<BR>
+//
+// SPDX-License-Identifier: BSD-2-Clause-Patent
+//
+//------------------------------------------------------------------------------
+#include <Base.h>
+
+.data
+
+.text
+.align 3
+
+.global ASM_PFX(InternalSyncCompareExchange32)
+.global ASM_PFX(InternalSyncCompareExchange64)
+.global ASM_PFX(InternalSyncIncrement)
+.global ASM_PFX(InternalSyncDecrement)
+
+//
+// ompare and xchange a 32-bit value.
+//
+// @param a0 : Pointer to 32-bit value.
+// @param a1 : Compare value.
+// @param a2 : Exchange value.
+//
+ASM_PFX (InternalSyncCompareExchange32):
+ lr.w a3, (a0) // Load the value from a0 and make
+ // the reservation of address.
+ bne a3, a1, exit
+ sc.w a3, a2, (a0) // Write the value back to the address.
+ mv a3, a1
+exit:
+ mv a0, a3
+ ret
+
+.global ASM_PFX(InternalSyncCompareExchange64)
+
+//
+// Compare and xchange a 64-bit value.
+//
+// @param a0 : Pointer to 64-bit value.
+// @param a1 : Compare value.
+// @param a2 : Exchange value.
+//
+ASM_PFX (SyncCompareExchange64):
+ lr.d a3, (a0) // Load the value from a0 and make
+ // the reservation of address.
+ bne a3, a1, exit
+ sc.d a3, a2, (a0) // Write the value back to the address.
+ mv a3, a1
+exit2:
+ mv a0, a3
+ ret
+
+//
+// Performs an atomic increment of an 32-bit unsigned integer.
+//
+// @param a0 : Pointer to 32-bit value.
+//
+ASM_PFX (InternalSyncIncrement):
+ li a1, 1
+ amoadd.w a2, a1, (a0)
+ mv a0, a2
+ ret
+
+//
+// Performs an atomic decrement of an 32-bit unsigned integer.
+//
+// @param a0 : Pointer to 32-bit value.
+//
+ASM_PFX (InternalSyncDecrement):
+ li a1, -1
+ amoadd.w a2, a1, (a0)
+ mv a0, a2
+ ret
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