1 /*
2 * Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
3 * Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without modification,
6 * are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice, this list of
9 * conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice, this list
12 * of conditions and the following disclaimer in the documentation and/or other materials
13 * provided with the distribution.
14 *
15 * 3. Neither the name of the copyright holder nor the names of its contributors may be used
16 * to endorse or promote products derived from this software without specific prior written
17 * permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
21 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
26 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
27 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
28 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
29 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 /**
33 * @defgroup los_asid mmu address space id
34 * @ingroup kernel
35 */
36
37 #include "los_asid.h"
38 #include "los_bitmap.h"
39 #include "los_spinlock.h"
40 #include "los_mmu_descriptor_v6.h"
41
42
43 #ifdef LOSCFG_KERNEL_VM
44
45 STATIC SPIN_LOCK_INIT(g_cpuAsidLock);
46 STATIC UINTPTR g_asidPool[BITMAP_NUM_WORDS(1UL << MMU_ARM_ASID_BITS)];
47
48 /* allocate and free asid */
OsAllocAsid(UINT32 * asid)49 status_t OsAllocAsid(UINT32 *asid)
50 {
51 UINT32 flags;
52 LOS_SpinLockSave(&g_cpuAsidLock, &flags);
53 UINT32 firstZeroBit = LOS_BitmapFfz(g_asidPool, 1UL << MMU_ARM_ASID_BITS);
54 if (firstZeroBit >= 0 && firstZeroBit < (1UL << MMU_ARM_ASID_BITS)) {
55 LOS_BitmapSetNBits(g_asidPool, firstZeroBit, 1);
56 *asid = firstZeroBit;
57 LOS_SpinUnlockRestore(&g_cpuAsidLock, flags);
58 return LOS_OK;
59 }
60
61 LOS_SpinUnlockRestore(&g_cpuAsidLock, flags);
62 return firstZeroBit;
63 }
64
OsFreeAsid(UINT32 asid)65 VOID OsFreeAsid(UINT32 asid)
66 {
67 UINT32 flags;
68 LOS_SpinLockSave(&g_cpuAsidLock, &flags);
69 LOS_BitmapClrNBits(g_asidPool, asid, 1);
70 LOS_SpinUnlockRestore(&g_cpuAsidLock, flags);
71 }
72 #endif
73
74