mirror of https://github.com/acidanthera/audk.git
89 lines
2.2 KiB
C
89 lines
2.2 KiB
C
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/*/@file
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Qemu fw-cfg wrappers for hardware info parsing.
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Provides an alternative to parse hardware information from a fw-cfg
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file without relying on dynamic memory allocations.
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Copyright 2021 - 2022 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <Library/DebugLib.h>
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#include <Library/QemuFwCfgLib.h>
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#include <Library/HardwareInfoLib.h>
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/**
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Update an optional pointer value if possible
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@param[out] DataSize Pointer to variable to be updated
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@param[in] Value Value to set the pointed variable to.
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**/
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STATIC
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VOID
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UpdateDataSize (
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OUT UINTN *DataSize,
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IN UINTN Value
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)
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{
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if (DataSize == NULL) {
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return;
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}
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*DataSize = Value;
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}
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EFI_STATUS
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QemuFwCfgReadNextHardwareInfoByType (
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IN HARDWARE_INFO_TYPE Type,
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IN UINTN TypeSize,
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IN UINTN TotalFileSize,
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OUT VOID *Data,
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OUT UINTN *DataSize OPTIONAL,
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IN OUT UINTN *ReadIndex
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)
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{
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HARDWARE_INFO_HEADER Header;
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if ((Data == NULL) ||
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(ReadIndex == NULL) ||
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(TypeSize == 0) ||
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(Type == HardwareInfoTypeUndefined) ||
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(TotalFileSize == 0))
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{
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return EFI_INVALID_PARAMETER;
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}
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UpdateDataSize (DataSize, 0);
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while (*ReadIndex < TotalFileSize) {
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QemuFwCfgReadBytes (sizeof (Header), &Header);
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*ReadIndex += sizeof (Header);
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if ((Header.Size > MAX_UINTN) || (((UINT64)*ReadIndex + Header.Size) > TotalFileSize)) {
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*ReadIndex = TotalFileSize;
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return EFI_ABORTED;
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}
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if ((Header.Type.Value == Type) && (Header.Size <= TypeSize)) {
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QemuFwCfgReadBytes ((UINTN)Header.Size, Data);
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*ReadIndex += (UINTN)Header.Size;
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UpdateDataSize (DataSize, (UINTN)Header.Size);
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return EFI_SUCCESS;
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}
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//
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// Skip the bytes corresponding to the next element as it is
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// not of the expected type and/or size. The TotalFileSize
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// and individual elements sizes should match so the size
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// check is skipped.
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//
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QemuFwCfgSkipBytes ((UINTN)Header.Size);
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*ReadIndex += (UINTN)Header.Size;
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}
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return EFI_END_OF_FILE;
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}
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