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1 | //------------------------------------------------------------------------------\r |
2 | //\r | |
3 | // RISC-V synchronization functions.\r | |
4 | //\r | |
5 | // Copyright (c) 2020, Hewlett Packard Enterprise Development LP. All rights reserved.<BR>\r | |
6 | //\r | |
7 | // SPDX-License-Identifier: BSD-2-Clause-Patent\r | |
8 | //\r | |
9 | //------------------------------------------------------------------------------\r | |
10 | #include <Base.h>\r | |
11 | \r | |
12 | .data\r | |
13 | \r | |
14 | .text\r | |
15 | .align 3\r | |
16 | \r | |
17 | .global ASM_PFX(InternalSyncCompareExchange32)\r | |
18 | .global ASM_PFX(InternalSyncCompareExchange64)\r | |
19 | .global ASM_PFX(InternalSyncIncrement)\r | |
20 | .global ASM_PFX(InternalSyncDecrement)\r | |
21 | \r | |
22 | //\r | |
23 | // ompare and xchange a 32-bit value.\r | |
24 | //\r | |
25 | // @param a0 : Pointer to 32-bit value.\r | |
26 | // @param a1 : Compare value.\r | |
27 | // @param a2 : Exchange value.\r | |
28 | //\r | |
29 | ASM_PFX (InternalSyncCompareExchange32):\r | |
30 | lr.w a3, (a0) // Load the value from a0 and make\r | |
31 | // the reservation of address.\r | |
32 | bne a3, a1, exit\r | |
33 | sc.w a3, a2, (a0) // Write the value back to the address.\r | |
34 | mv a3, a1\r | |
35 | exit:\r | |
36 | mv a0, a3\r | |
37 | ret\r | |
38 | \r | |
39 | .global ASM_PFX(InternalSyncCompareExchange64)\r | |
40 | \r | |
41 | //\r | |
42 | // Compare and xchange a 64-bit value.\r | |
43 | //\r | |
44 | // @param a0 : Pointer to 64-bit value.\r | |
45 | // @param a1 : Compare value.\r | |
46 | // @param a2 : Exchange value.\r | |
47 | //\r | |
48 | ASM_PFX (SyncCompareExchange64):\r | |
49 | lr.d a3, (a0) // Load the value from a0 and make\r | |
50 | // the reservation of address.\r | |
51 | bne a3, a1, exit\r | |
52 | sc.d a3, a2, (a0) // Write the value back to the address.\r | |
53 | mv a3, a1\r | |
54 | exit2:\r | |
55 | mv a0, a3\r | |
56 | ret\r | |
57 | \r | |
58 | //\r | |
59 | // Performs an atomic increment of an 32-bit unsigned integer.\r | |
60 | //\r | |
61 | // @param a0 : Pointer to 32-bit value.\r | |
62 | //\r | |
63 | ASM_PFX (InternalSyncIncrement):\r | |
64 | li a1, 1\r | |
65 | amoadd.w a2, a1, (a0)\r | |
66 | mv a0, a2\r | |
67 | ret\r | |
68 | \r | |
69 | //\r | |
70 | // Performs an atomic decrement of an 32-bit unsigned integer.\r | |
71 | //\r | |
72 | // @param a0 : Pointer to 32-bit value.\r | |
73 | //\r | |
74 | ASM_PFX (InternalSyncDecrement):\r | |
75 | li a1, -1\r | |
76 | amoadd.w a2, a1, (a0)\r | |
77 | mv a0, a2\r | |
78 | ret\r |