forked from xt-sys/exectos
95 lines
2.8 KiB
C
95 lines
2.8 KiB
C
/**
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* PROJECT: ExectOS
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* COPYRIGHT: See COPYING.md in the top level directory
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* FILE: xtoskrnl/ke/info.c
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* DESCRIPTION: Generic kernel information support
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* DEVELOPERS: Aiken Harris <harraiken91@gmail.com>
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*/
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#include <xtos.h>
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/**
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* Retrieves the system firmware type (BIOS or UEFI).
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*
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* @return This routine returns the type of the system firmware.
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*
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* @since XT 1.0
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*/
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XTAPI
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SYSTEM_FIRMWARE_TYPE
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KeGetFirmwareType(VOID)
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{
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return KeInitializationBlock->FirmwareInformation.FirmwareType;
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}
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/**
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* Retrieves a pointer to the specified kernel parameter within the kernel parameters list.
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*
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* @param ParameterName
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* Supplies a pointer to a null-terminated wide string specifying the name of the parameter to search for.
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*
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* @param Parameter
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* Supplies a pointer to a variable that receives a pointer to the matching parameter, or NULL if not found.
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*
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* @return This routine returns a status code.
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*
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* @since XT 1.0
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*/
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XTAPI
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XTSTATUS
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KeGetKernelParameter(IN PCWSTR ParameterName,
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OUT PCWSTR *Parameter)
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{
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PCWSTR KernelParameters,Match, SearchStart;
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SIZE_T ParameterNameLength;
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/* Get the kernel parameters */
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KernelParameters = KeInitializationBlock->KernelParameters;
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/* Validate input parameters */
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if(!KernelParameters || !ParameterName || !Parameter)
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{
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/* Invalid input parameters, return error */
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return STATUS_INVALID_PARAMETER;
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}
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/* Get the length of the parameter name we are looking for */
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ParameterNameLength = RtlWideStringLength(ParameterName, 0);
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if(ParameterNameLength == 0)
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{
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/* Do not allow empty parameter names */
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return STATUS_INVALID_PARAMETER;
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}
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/* Assume the requested parameter is not present in the kernel parameters */
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*Parameter = NULL;
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/* Start searching from the beginning of the list */
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SearchStart = KernelParameters;
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/* Search for the parameter name */
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while((Match = RtlFindWideStringInsensitive(SearchStart, ParameterName)))
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{
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/* Check if the match is at the start of the string or preceded by a space */
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if(Match == KernelParameters || *(Match - 1) == L' ')
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{
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/* Check the character after the match to avoid matching prefixes */
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if(Match[ParameterNameLength] == L'\0' ||
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Match[ParameterNameLength] == L' ' ||
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Match[ParameterNameLength] == L'=')
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{
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/* A valid parameter was found, return a pointer to it */
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*Parameter = Match;
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return STATUS_SUCCESS;
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}
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}
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/* The match was a substring of a larger token, continue searching */
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SearchStart = Match + 1;
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}
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/* Parameter not found */
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return STATUS_NOT_FOUND;
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}
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