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 #include "los_vm_page.h"
33 #include "los_vm_common.h"
34 #include "los_vm_phys.h"
35 #include "los_vm_boot.h"
36 #include "los_vm_filemap.h"
37
38
39 #ifdef LOSCFG_KERNEL_VM
40
41 LosVmPage *g_vmPageArray = NULL;
42 size_t g_vmPageArraySize;
43
OsVmPageInit(LosVmPage * page,paddr_t pa,UINT8 segID)44 STATIC VOID OsVmPageInit(LosVmPage *page, paddr_t pa, UINT8 segID)
45 {
46 LOS_ListInit(&page->node);
47 page->flags = FILE_PAGE_FREE;
48 LOS_AtomicSet(&page->refCounts, 0);
49 page->physAddr = pa;
50 page->segID = segID;
51 page->order = VM_LIST_ORDER_MAX;
52 page->nPages = 0;
53 #ifdef LOSCFG_PAGE_TABLE_FINE_LOCK
54 LOS_SpinInit(&page->lock);
55 #endif
56 }
57
OsVmPageOrderListInit(LosVmPage * page,size_t nPages)58 STATIC INLINE VOID OsVmPageOrderListInit(LosVmPage *page, size_t nPages)
59 {
60 OsVmPhysPagesFreeContiguous(page, nPages);
61 }
62
63 #define VMPAGEINIT(page, pa, segID) do { \
64 OsVmPageInit(page, pa, segID); \
65 (page)++; \
66 (pa) += PAGE_SIZE; \
67 } while (0)
68
OsVmPageStartup(VOID)69 VOID OsVmPageStartup(VOID)
70 {
71 struct VmPhysSeg *seg = NULL;
72 LosVmPage *page = NULL;
73 paddr_t pa;
74 UINT32 nPage;
75 INT32 segID;
76
77 OsVmPhysAreaSizeAdjust(ROUNDUP((g_vmBootMemBase - KERNEL_ASPACE_BASE), PAGE_SIZE));
78
79 /*
80 * Pages getting from OsVmPhysPageNumGet() interface here contain the memory
81 * struct LosVmPage occupied, which satisfies the equation:
82 * nPage * sizeof(LosVmPage) + nPage * PAGE_SIZE = OsVmPhysPageNumGet() * PAGE_SIZE.
83 */
84 nPage = OsVmPhysPageNumGet() * PAGE_SIZE / (sizeof(LosVmPage) + PAGE_SIZE);
85 g_vmPageArraySize = nPage * sizeof(LosVmPage);
86 g_vmPageArray = (LosVmPage *)OsVmBootMemAlloc(g_vmPageArraySize);
87
88 OsVmPhysAreaSizeAdjust(ROUNDUP(g_vmPageArraySize, PAGE_SIZE));
89
90 OsVmPhysSegAdd();
91 OsVmPhysInit();
92
93 for (segID = 0; segID < g_vmPhysSegNum; segID++) {
94 seg = &g_vmPhysSeg[segID];
95 nPage = seg->size >> PAGE_SHIFT;
96 UINT32 count = nPage >> 3; /* 3: 2 ^ 3, nPage / 8, cycle count */
97 UINT32 left = nPage & 0x7; /* 0x7: nPage % 8, left page */
98
99 for (page = seg->pageBase, pa = seg->start; count > 0; count--) {
100 /* note: process large amount of data, optimize performance */
101 VMPAGEINIT(page, pa, segID);
102 VMPAGEINIT(page, pa, segID);
103 VMPAGEINIT(page, pa, segID);
104 VMPAGEINIT(page, pa, segID);
105 VMPAGEINIT(page, pa, segID);
106 VMPAGEINIT(page, pa, segID);
107 VMPAGEINIT(page, pa, segID);
108 VMPAGEINIT(page, pa, segID);
109 }
110 for (; left > 0; left--) {
111 VMPAGEINIT(page, pa, segID);
112 }
113 OsVmPageOrderListInit(seg->pageBase, nPage);
114 }
115 }
116
LOS_VmPageGet(PADDR_T paddr)117 LosVmPage *LOS_VmPageGet(PADDR_T paddr)
118 {
119 INT32 segID;
120 LosVmPage *page = NULL;
121
122 for (segID = 0; segID < g_vmPhysSegNum; segID++) {
123 page = OsVmPhysToPage(paddr, segID);
124 if (page != NULL) {
125 break;
126 }
127 }
128
129 return page;
130 }
131 #endif
132
133