VirtualBox

source: vbox/trunk/src/VBox/Additions/x11/vboxvideo/hgsmimemalloc.c@ 86186

Last change on this file since 86186 was 82968, checked in by vboxsync, 5 years ago

Copyright year updates by scm.

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  • Property svn:keywords set to Author Date Id Revision
File size: 3.2 KB
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1/* $Id: hgsmimemalloc.c 82968 2020-02-04 10:35:17Z vboxsync $ */
2/*
3 * Copyright (C) 2017-2020 Oracle Corporation
4 *
5 * Permission is hereby granted, free of charge, to any person
6 * obtaining a copy of this software and associated documentation
7 * files (the "Software"), to deal in the Software without
8 * restriction, including without limitation the rights to use,
9 * copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following
12 * conditions:
13 *
14 * The above copyright notice and this permission notice shall be
15 * included in all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
18 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
19 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
20 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
21 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
22 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
23 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
24 * OTHER DEALINGS IN THE SOFTWARE.
25 */
26
27/*
28 * Memory allocator
29 * ----------------
30 *
31 * Implementation
32 * --------------
33 *
34 * Since the X.Org driver is single threaded and works using an allocate,
35 * submit and free pattern, we replace the generic allocator with a simple
36 * Boolean. Need more be said?
37 *
38 * bird> Yes, it's buggy. You never set fAllocated. See HGSMIMAAlloc().
39 */
40
41#include <VBoxVideoIPRT.h>
42#include <HGSMIMemAlloc.h>
43#include <HGSMI.h>
44
45int HGSMIMAInit(HGSMIMADATA *pMA, const HGSMIAREA *pArea,
46 HGSMIOFFSET *paDescriptors, uint32_t cDescriptors, HGSMISIZE cbMaxBlock,
47 const HGSMIENV *pEnv)
48{
49 (void)paDescriptors;
50 (void)cDescriptors;
51 (void)cbMaxBlock;
52 (void)pEnv;
53 if (!(pArea->cbArea < UINT32_C(0x80000000)))
54 return VERR_INVALID_PARAMETER;
55 if (!(pArea->cbArea >= HGSMI_MA_BLOCK_SIZE_MIN))
56 return VERR_INVALID_PARAMETER;
57
58 pMA->area = *pArea;
59 pMA->fAllocated = false;
60 return VINF_SUCCESS;
61}
62
63void HGSMIMAUninit(HGSMIMADATA *pMA)
64{
65 (void)pMA;
66}
67
68static HGSMIOFFSET HGSMIMAPointerToOffset(const HGSMIMADATA *pMA, const void RT_UNTRUSTED_VOLATILE_GUEST *pv)
69{
70 if (HGSMIAreaContainsPointer(&pMA->area, pv))
71 return HGSMIPointerToOffset(&pMA->area, pv);
72
73 AssertFailed();
74 return HGSMIOFFSET_VOID;
75}
76
77static void RT_UNTRUSTED_VOLATILE_GUEST *HGSMIMAOffsetToPointer(const HGSMIMADATA *pMA, HGSMIOFFSET off)
78{
79 if (HGSMIAreaContainsOffset(&pMA->area, off))
80 return HGSMIOffsetToPointer(&pMA->area, off);
81
82 AssertFailed();
83 return NULL;
84}
85
86void RT_UNTRUSTED_VOLATILE_GUEST *HGSMIMAAlloc(HGSMIMADATA *pMA, HGSMISIZE cb)
87{
88 (void)cb;
89 if (pMA->fAllocated)
90 return NULL;
91 HGSMIOFFSET off = pMA->area.offBase;
92 return HGSMIMAOffsetToPointer(pMA, off);
93 pMA->fAllocated = true; /** @todo r=bird: Errr. what's this doing *after* the return statement? */
94}
95
96void HGSMIMAFree(HGSMIMADATA *pMA, void RT_UNTRUSTED_VOLATILE_GUEST *pv)
97{
98 HGSMIOFFSET off = HGSMIMAPointerToOffset(pMA, pv);
99 if (off != HGSMIOFFSET_VOID)
100 pMA->fAllocated = false;
101 else
102 AssertFailed();
103}
104
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