[BOOT:MM] Begin work on memory manager

BOOT/ENVIRON/LIB/MM/mm.c

@@ -0,0 +1,87 @@
+/*++
+
+Copyright (c) 2024, Quinn Stephens.
+Provided under the BSD 3-Clause license.
+
+Module Name:
+
+   mm.c
+
+Abstract:
+
+   Provides boot library memory manager routines.
+
+--*/
+
+#include <ntrtl.h>
+#include "bootlib.h"
+#include "mm.h"
+
+#define MAX_STATIC_DESCRIPTOR_COUNT 1024
+
+BOOT_MEMORY_DESCRIPTOR MmStaticMemoryDescriptors[MAX_STATIC_DESCRIPTOR_COUNT];
+PBOOT_MEMORY_DESCRIPTOR MmGlobalMemoryDescriptors;
+ULONG MmGlobalMemoryDescriptorCount;
+
+NTSTATUS
+BlpMmInitialize (
+    IN PBOOT_MEMORY_INFO MemoryInfo,
+    IN ULONG TranslationType,
+    IN PBOOT_LIBRARY_PARAMETERS LibraryParameters
+    )
+
+/*++
+
+Routine Description:
+
+    Initializes the boot memory manager.
+
+Arguments:
+
+    MemoryInfo - pointer to the memory info structure.
+
+    TranslationType - the current translation type being used.
+
+    LibraryParameters - pointer to the library parameters structure.
+
+Return Value:
+
+    STATUS_SUCCESS if successful,
+    STATUS_INVALID_PARAMETER if TranslationType is invalid,
+    Other NTSTATUS value if an error occurs.
+
+--*/
+
+{
+    NTSTATUS Status;
+
+    DebugPrint(L"Initializing memory manager...\r\n");
+
+    //
+    // Check TranslationType.
+    //
+    if (
+        TranslationType > BOOT_TRANSLATION_TYPE_MAX ||
+        LibraryParameters->TranslationType > BOOT_TRANSLATION_TYPE_MAX
+    ) {
+        DebugPrint(L"BlpMmInitialize(): TranslationType is invalid\r\n");
+        return STATUS_INVALID_PARAMETER;
+    }
+
+    //
+    // Initialize memory descriptors.
+    //
+    MmGlobalMemoryDescriptors = &MmStaticMemoryDescriptors[0];
+    MmGlobalMemoryDescriptorCount = MAX_STATIC_DESCRIPTOR_COUNT;
+    RtlZeroMemory(MmGlobalMemoryDescriptors, MAX_STATIC_DESCRIPTOR_COUNT * sizeof(BOOT_MEMORY_DESCRIPTOR));
+
+    //
+    // Initialize the page allocator.
+    //
+    Status = MmPaInitialize(MemoryInfo, LibraryParameters->MinimumPageAllocation);
+    if (!NT_SUCCESS(Status)) {
+        return Status;
+    }
+
+    return STATUS_SUCCESS;
+}