config.c File Reference

#include <ntoskrnl.h>

Include dependency graph for config.c:

Go to the source code of this file.

Functions
PCONFIGURATION_COMPONENT_DATA NTAPI	KeFindConfigurationNextEntry (_In_ PCONFIGURATION_COMPONENT_DATA Child, _In_ CONFIGURATION_CLASS Class, _In_ CONFIGURATION_TYPE Type, _In_opt_ PULONG ComponentKey, _Inout_ PCONFIGURATION_COMPONENT_DATA *NextLink)
PCONFIGURATION_COMPONENT_DATA NTAPI	KeFindConfigurationEntry (_In_ PCONFIGURATION_COMPONENT_DATA Child, _In_ CONFIGURATION_CLASS Class, _In_ CONFIGURATION_TYPE Type, _In_opt_ PULONG ComponentKey)

Function Documentation

KeFindConfigurationEntry()

PCONFIGURATION_COMPONENT_DATA NTAPI KeFindConfigurationEntry	(	_In_ PCONFIGURATION_COMPONENT_DATA	Child,
		_In_ CONFIGURATION_CLASS	Class,
		_In_ CONFIGURATION_TYPE	Type,
		_In_opt_ PULONG	ComponentKey
	)

Definition at line 108 of file config.c.

{
    PCONFIGURATION_COMPONENT_DATA NextLink = NULL;
 
    /* Start search at the root */
    return KeFindConfigurationNextEntry(Child,
                                        Class,
                                        Type,
                                        ComponentKey,
                                        &NextLink);
}

Referenced by FindBootDisplayFromLoaderARCTree(), and NtLdrDetectBootVid().

KeFindConfigurationNextEntry()

PCONFIGURATION_COMPONENT_DATA NTAPI KeFindConfigurationNextEntry	(	_In_ PCONFIGURATION_COMPONENT_DATA	Child,
		_In_ CONFIGURATION_CLASS	Class,
		_In_ CONFIGURATION_TYPE	Type,
		_In_opt_ PULONG	ComponentKey,
		_Inout_ PCONFIGURATION_COMPONENT_DATA *	NextLink
	)

Definition at line 21 of file config.c.

{
    ULONG Key = 0;
    ULONG Mask = 0;
    PCONFIGURATION_COMPONENT_DATA Sibling;
    PCONFIGURATION_COMPONENT_DATA ReturnEntry;
 
    /* If we did get a key, then use it instead */
    if (ComponentKey)
    {
        Key = *ComponentKey;
        Mask = -1;
    }
 
    /* Loop the components until we find a a match */
    for (; Child; Child = Child->Child)
    {
        /* Check if we are starting somewhere already */
        if (*NextLink)
        {
            /* If we've found the place where we started, clear and continue */
            if (Child == *NextLink)
                *NextLink = NULL;
        }
        else
        {
            /* Try to get a match */
            if ((Child->ComponentEntry.Class) == Class &&
                (Child->ComponentEntry.Type) == Type &&
                (Child->ComponentEntry.Key & Mask) == Key)
            {
                /* Match found */
                return Child;
            }
        }
 
        /* Now we've also got to lookup the siblings */
        for (Sibling = Child->Sibling; Sibling; Sibling = Sibling->Sibling)
        {
            /* Check if we are starting somewhere already */
            if (*NextLink)
            {
                /* If we've found the place where we started, clear and continue */
                if (Sibling == *NextLink)
                    *NextLink = NULL;
            }
            else
            {
                /* Try to get a match */
                if ((Sibling->ComponentEntry.Class == Class) &&
                    (Sibling->ComponentEntry.Type == Type) &&
                    (Sibling->ComponentEntry.Key & Mask) == Key)
                {
                    /* Match found */
                    return Sibling;
                }
            }
 
            /* We've got to check if the sibling has a child as well */
            if (Sibling->Child)
            {
                /* We're just going to call ourselves again */
                ReturnEntry = KeFindConfigurationNextEntry(Sibling->Child,
                                                           Class,
                                                           Type,
                                                           ComponentKey,
                                                           NextLink);
                if (ReturnEntry)
                    return ReturnEntry;
            }
        }
    }
 
    /* If we got here, nothing was found */
    return NULL;
}

Referenced by FindBootDisplayFromLoaderARCTree(), HalpAcpiFindRsdtPhase0(), KeFindConfigurationEntry(), and KeFindConfigurationNextEntry().