Add generic kernel information support

xtoskrnl/CMakeLists.txt

@@ -43,6 +43,7 @@ list(APPEND XTOSKRNL_SOURCE
     ${XTOSKRNL_SOURCE_DIR}/ke/dpc.c
     ${XTOSKRNL_SOURCE_DIR}/ke/event.c
     ${XTOSKRNL_SOURCE_DIR}/ke/globals.c
+    ${XTOSKRNL_SOURCE_DIR}/ke/info.c
     ${XTOSKRNL_SOURCE_DIR}/ke/kprocess.c
     ${XTOSKRNL_SOURCE_DIR}/ke/krnlinit.c
     ${XTOSKRNL_SOURCE_DIR}/ke/kthread.c

xtoskrnl/includes/kei.h

@@ -21,6 +21,15 @@ XTAPI
 VOID
 KeClearTimer(IN PKTIMER Timer);
 
+XTAPI
+SYSTEM_FIRMWARE_TYPE
+KeGetFirmwareType(VOID);
+
+XTAPI
+XTSTATUS
+KeGetKernelParameter(IN PCWSTR ParameterName,
+                     OUT PCWSTR *Parameter);
+
 XTAPI
 VOID
 KeHaltSystem(VOID);

xtoskrnl/ke/info.c

@@ -0,0 +1,94 @@
+/**
+ * PROJECT:         ExectOS
+ * COPYRIGHT:       See COPYING.md in the top level directory
+ * FILE:            xtoskrnl/ke/info.c
+ * DESCRIPTION:     Generic kernel information support
+ * DEVELOPERS:      Aiken Harris <harraiken91@gmail.com>
+ */
+
+#include <xtos.h>
+
+
+/**
+ * Retrieves the system firmware type (BIOS or UEFI).
+ *
+ * @return This routine returns the type of the system firmware.
+ *
+ * @since XT 1.0
+ */
+XTAPI
+SYSTEM_FIRMWARE_TYPE
+KeGetFirmwareType(VOID)
+{
+    return KeInitializationBlock->FirmwareInformation.FirmwareType;
+}
+
+/**
+ * Retrieves a pointer to the specified kernel parameter within the kernel parameters list.
+ *
+ * @param ParameterName
+ *        Supplies a pointer to a null-terminated wide string specifying the name of the parameter to search for.
+ *
+ * @param Parameter
+ *        Supplies a pointer to a variable that receives a pointer to the matching parameter, or NULL if not found.
+ *
+ * @return This routine returns a status code.
+ *
+ * @since XT 1.0
+ */
+XTAPI
+XTSTATUS
+KeGetKernelParameter(IN PCWSTR ParameterName,
+                     OUT PCWSTR *Parameter)
+{
+    PCWSTR KernelParameters,Match, SearchStart;
+    SIZE_T ParameterNameLength;
+
+    /* Get the kernel parameters */
+    KernelParameters = KeInitializationBlock->KernelParameters;
+
+    /* Validate input parameters */
+    if(!KernelParameters || !ParameterName || !Parameter)
+    {
+        /* Invalid input parameters, return error */
+        return STATUS_INVALID_PARAMETER;
+    }
+
+    /* Get the length of the parameter name we are looking for */
+    ParameterNameLength = RtlWideStringLength(ParameterName, 0);
+    if(ParameterNameLength == 0)
+    {
+        /* Do not allow empty parameter names */
+        return STATUS_INVALID_PARAMETER;
+    }
+
+    /* Assume the requested parameter is not present in the kernel parameters */
+    *Parameter = NULL;
+
+    /* Start searching from the beginning of the list */
+    SearchStart = KernelParameters;
+
+    /* Search for the parameter name */
+    while((Match = RtlFindWideStringInsensitive(SearchStart, ParameterName)))
+    {
+        /* Check if the match is at the start of the string or preceded by a space */
+        if(Match == KernelParameters || *(Match - 1) == L' ')
+        {
+            /* Check the character after the match to avoid matching prefixes */
+            if(Match[ParameterNameLength] == L'\0' ||
+               Match[ParameterNameLength] == L' ' ||
+               Match[ParameterNameLength] == L'=')
+            {
+                /* A valid parameter was found, return a pointer to it */
+                *Parameter = Match;
+                return STATUS_SUCCESS;
+            }
+        }
+
+        /* The match was a substring of a larger token, continue searching */
+        SearchStart = Match + 1;
+    }
+
+    /* Parameter not found */
+    return STATUS_NOT_FOUND;
+}