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Diffstat (limited to '')
-rw-r--r-- | src/VBox/Additions/x11/vboxvideo/hgsmimemalloc.c | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/src/VBox/Additions/x11/vboxvideo/hgsmimemalloc.c b/src/VBox/Additions/x11/vboxvideo/hgsmimemalloc.c new file mode 100644 index 00000000..3fb35831 --- /dev/null +++ b/src/VBox/Additions/x11/vboxvideo/hgsmimemalloc.c @@ -0,0 +1,104 @@ +/* $Id: hgsmimemalloc.c $ */ +/* + * Copyright (C) 2017-2023 Oracle and/or its affiliates. + * + * Permission is hereby granted, free of charge, to any person + * obtaining a copy of this software and associated documentation + * files (the "Software"), to deal in the Software without + * restriction, including without limitation the rights to use, + * copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following + * conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES + * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT + * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, + * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + */ + +/* + * Memory allocator + * ---------------- + * + * Implementation + * -------------- + * + * Since the X.Org driver is single threaded and works using an allocate, + * submit and free pattern, we replace the generic allocator with a simple + * Boolean. Need more be said? + * + * bird> Yes, it's buggy. You never set fAllocated. See HGSMIMAAlloc(). + */ + +#include <VBoxVideoIPRT.h> +#include <HGSMIMemAlloc.h> +#include <HGSMI.h> + +int HGSMIMAInit(HGSMIMADATA *pMA, const HGSMIAREA *pArea, + HGSMIOFFSET *paDescriptors, uint32_t cDescriptors, HGSMISIZE cbMaxBlock, + const HGSMIENV *pEnv) +{ + (void)paDescriptors; + (void)cDescriptors; + (void)cbMaxBlock; + (void)pEnv; + if (!(pArea->cbArea < UINT32_C(0x80000000))) + return VERR_INVALID_PARAMETER; + if (!(pArea->cbArea >= HGSMI_MA_BLOCK_SIZE_MIN)) + return VERR_INVALID_PARAMETER; + + pMA->area = *pArea; + pMA->fAllocated = false; + return VINF_SUCCESS; +} + +void HGSMIMAUninit(HGSMIMADATA *pMA) +{ + (void)pMA; +} + +static HGSMIOFFSET HGSMIMAPointerToOffset(const HGSMIMADATA *pMA, const void RT_UNTRUSTED_VOLATILE_GUEST *pv) +{ + if (HGSMIAreaContainsPointer(&pMA->area, pv)) + return HGSMIPointerToOffset(&pMA->area, pv); + + AssertFailed(); + return HGSMIOFFSET_VOID; +} + +static void RT_UNTRUSTED_VOLATILE_GUEST *HGSMIMAOffsetToPointer(const HGSMIMADATA *pMA, HGSMIOFFSET off) +{ + if (HGSMIAreaContainsOffset(&pMA->area, off)) + return HGSMIOffsetToPointer(&pMA->area, off); + + AssertFailed(); + return NULL; +} + +void RT_UNTRUSTED_VOLATILE_GUEST *HGSMIMAAlloc(HGSMIMADATA *pMA, HGSMISIZE cb) +{ + (void)cb; + if (pMA->fAllocated) + return NULL; + HGSMIOFFSET off = pMA->area.offBase; + return HGSMIMAOffsetToPointer(pMA, off); + pMA->fAllocated = true; /** @todo r=bird: Errr. what's this doing *after* the return statement? */ +} + +void HGSMIMAFree(HGSMIMADATA *pMA, void RT_UNTRUSTED_VOLATILE_GUEST *pv) +{ + HGSMIOFFSET off = HGSMIMAPointerToOffset(pMA, pv); + if (off != HGSMIOFFSET_VOID) + pMA->fAllocated = false; + else + AssertFailed(); +} + |