Fill in kernel initialization block

xtldr/includes/blproto.h

@@ -21,6 +21,7 @@ typedef EFI_STATUS (*PBL_ENABLE_PAGING)(IN PLIST_ENTRY MemoryMappings, IN PVOID
 typedef EFI_STATUS (*PBL_FREE_PAGES)(IN UINT64 Size, IN EFI_PHYSICAL_ADDRESS Memory);
 typedef EFI_STATUS (*PBL_FREE_POOL)(IN PVOID Memory);
 typedef EFI_STATUS (*PBL_GET_MEMORY_MAP)(OUT PEFI_MEMORY_MAP MemoryMap);
+typedef EFI_STATUS (*PBL_GET_VIRTUAL_ADDRESS)(IN PLIST_ENTRY MemoryMappings, IN PVOID PhysicalAddress, OUT PVOID *VirtualAddress);
 typedef EFI_STATUS (*PBL_INIT_VIRTUAL_MEMORY)(IN OUT PLIST_ENTRY MemoryMappings, IN OUT PVOID *MemoryMapAddress);
 typedef EFI_STATUS (*PBL_MAP_VIRTUAL_MEMORY)(IN PLIST_ENTRY MemoryMappings, IN UINT_PTR VirtualAddress, IN UINT_PTR PhysicalAddress, IN UINT NumberOfPages, IN BOOLEAN PaeExtension, IN OUT PVOID *PtePointer);
 typedef VOID (*PBL_GET_STACK)(OUT PVOID *Stack);
@@ -39,6 +40,7 @@ typedef struct _XT_BOOT_LOADER_PROTOCOL
     PBL_FREE_POOL FreePool;
     PBL_ENABLE_PAGING EnablePaging;
     PBL_GET_MEMORY_MAP GetMemoryMap;
+    PBL_GET_VIRTUAL_ADDRESS GetVirtualAddress;
     PBL_INIT_VIRTUAL_MEMORY InitializeVirtualMemory;
     PBL_MAP_VIRTUAL_MEMORY MapVirtualMemory;
     PBL_GET_STACK GetStack;

xtldr/includes/xtbl.h

@@ -114,6 +114,11 @@ BlGetMemoryMap(OUT PEFI_MEMORY_MAP MemoryMap);
 
 VOID BlGetStackPointer(OUT PVOID *Stack);
 
+EFI_STATUS
+BlGetVirtualAddress(IN PLIST_ENTRY MemoryMappings,
+                    IN PVOID PhysicalAddress,
+                    OUT PVOID *VirtualAddress);
+
 EFI_STATUS
 BlGetVolumeDevicePath(IN PUCHAR SystemPath,
                       OUT PEFI_DEVICE_PATH_PROTOCOL *DevicePath,

xtldr/memory.c

@@ -366,6 +366,67 @@ BlGetMemoryMap(OUT PEFI_MEMORY_MAP MemoryMap)
     return STATUS_EFI_SUCCESS;
 }
 
+/**
+ * Attempts to find a virtual address of the specified physical address in memory mappings.
+ *
+ * @param MemoryMappings
+ *        Supplies a pointer to linked list containing all memory mappings.
+ *
+ * @param PhysicalAddress
+ *        Supplies a physical address to search for in the mappings.
+ *
+ * @param VirtualAddress
+ *        Supplies a buffer, where mapped virtual address of the found mapping will be stored.
+ *
+ * @return This routine returns a status code.
+ *
+ * @since XT 1.0
+ */
+EFI_STATUS
+BlGetVirtualAddress(IN PLIST_ENTRY MemoryMappings,
+                    IN PVOID PhysicalAddress,
+                    OUT PVOID *VirtualAddress)
+{
+    PLOADER_MEMORY_MAPPING Mapping;
+    PLIST_ENTRY ListEntry;
+
+    /* NULLify virtual address */
+    *VirtualAddress = NULL;
+
+    /* Iterate over memory mappings in order to find descriptor containing a physical address */
+    ListEntry = MemoryMappings->Flink;
+    while(ListEntry != MemoryMappings)
+    {
+        /* Get mapping from linked list */
+        Mapping = CONTAIN_RECORD(ListEntry, LOADER_MEMORY_MAPPING, ListEntry);
+
+        /* Make sure any virtual address is set */
+        if(Mapping->VirtualAddress)
+        {
+            /* Check if provided physical address is in range of this mapping */
+            if((PhysicalAddress >= Mapping->PhysicalAddress) &&
+               (PhysicalAddress < Mapping->PhysicalAddress + (Mapping->NumberOfPages * EFI_PAGE_SIZE)))
+            {
+                /* Calculate virtual address based on the mapping */
+                *VirtualAddress = PhysicalAddress - Mapping->PhysicalAddress + Mapping->VirtualAddress;
+            }
+        }
+
+        /* Get next element from the list */
+        ListEntry = ListEntry->Flink;
+    }
+
+    /* If virtual address is still NULL, then mapping was not found */
+    if(*VirtualAddress == NULL)
+    {
+        /* Mapping not found */
+        return STATUS_EFI_NOT_FOUND;
+    }
+
+    /* Mapping found, return success */
+    return STATUS_EFI_SUCCESS;
+}
+
 /**
  * Initializes virtual memory by adding known and general mappings.
  *
@@ -428,8 +489,8 @@ BlInitializeVirtualMemory(IN OUT PLIST_ENTRY MemoryMappings,
             else if(MemoryType != LoaderFree)
             {
                 /* Add any non-free memory mapping */
-                Status = BlAddVirtualMemoryMapping(MemoryMappings, VirtualAddress,
-                                                   (PVOID)Descriptor->PhysicalStart, Descriptor->NumberOfPages, MemoryType);
+                Status = BlAddVirtualMemoryMapping(MemoryMappings, VirtualAddress, (PVOID)Descriptor->PhysicalStart,
+                                                   Descriptor->NumberOfPages, MemoryType);
 
                 /* Calculate next valid virtual address */
                 VirtualAddress += Descriptor->NumberOfPages * EFI_PAGE_SIZE;

xtldr/modules/xtos/xtos.c

@@ -156,27 +156,58 @@ XtpInitializeLoaderBlock(IN PLIST_ENTRY MemoryMappings, IN PVOID *VirtualAddress
 {
     PKERNEL_INITIALIZATION_BLOCK LoaderBlock;
     EFI_PHYSICAL_ADDRESS Address;
+    PVOID RuntimeServices;
     EFI_STATUS Status;
     UINT BlockPages;
 
+    /* Calculate number of pages needed for initialization block */
     BlockPages = EFI_SIZE_TO_PAGES(sizeof(KERNEL_INITIALIZATION_BLOCK));
 
+    /* Allocate memory for kernel initialization block */
     Status = XtLdrProtocol->AllocatePages(BlockPages, &Address);
     if(Status != STATUS_EFI_SUCCESS)
     {
+        /* Memory allocation failure */
         return Status;
     }
 
+    /* Initialize and zero-fill kernel initialization block */
     LoaderBlock = (PKERNEL_INITIALIZATION_BLOCK)(UINT_PTR)Address;
     RtlZeroMemory(LoaderBlock, sizeof(KERNEL_INITIALIZATION_BLOCK));
 
-    LoaderBlock->LoaderInformation.DbgPrint = XtLdrProtocol->DbgPrint;
+    /* Set basic loader block properties */
+    LoaderBlock->Size = sizeof(KERNEL_INITIALIZATION_BLOCK);
     LoaderBlock->Version = INITIALIZATION_BLOCK_VERSION;
 
-    XtLdrProtocol->AddVirtualMemoryMapping(MemoryMappings, *VirtualAddress, (PVOID)LoaderBlock, BlockPages, LoaderSystemBlock);
+    /* No kernel stack available now */
+    LoaderBlock->KernelStack = (ULONG_PTR)NULL;
 
+    /* Set LoaderInformation block properties */
+    LoaderBlock->LoaderInformation.DbgPrint = XtLdrProtocol->DbgPrint;
+
+    /* Attempt to find virtual address of the EFI Runtime Services */
+    Status = XtLdrProtocol->GetVirtualAddress(MemoryMappings, &EfiSystemTable->RuntimeServices->Hdr, &RuntimeServices);
+    if(Status == STATUS_EFI_SUCCESS)
+    {
+        /* Set FirmwareInformation block properties */
+        LoaderBlock->FirmwareInformation.FirmwareType = SystemFirmwareEfi;
+        LoaderBlock->FirmwareInformation.EfiFirmware.EfiVersion = EfiSystemTable->Hdr.Revision;
+        LoaderBlock->FirmwareInformation.EfiFirmware.EfiRuntimeServices = RuntimeServices;
+    }
+    else
+    {
+        /* Set invalid firmware type to indicate that kernel cannot rely on FirmwareInformation block */
+        LoaderBlock->FirmwareInformation.FirmwareType = SystemFirmwareInvalid;
+    }
+
+    /* Map kernel initialization block */
+    XtLdrProtocol->AddVirtualMemoryMapping(MemoryMappings, *VirtualAddress, (PVOID)LoaderBlock,
+                                           BlockPages, LoaderSystemBlock);
+
+    /* Calculate next valid virtual address */
     *VirtualAddress += (UINT_PTR)(BlockPages * EFI_PAGE_SIZE);
 
+    /* Return success */
     return STATUS_EFI_SUCCESS;
 }
 

xtldr/xtldr.c

@@ -332,6 +332,7 @@ BlRegisterXtLoaderProtocol()
     EfiLdrProtocol.FreePool = BlEfiMemoryFreePool;
     EfiLdrProtocol.EnablePaging = BlEnablePaging;
     EfiLdrProtocol.GetMemoryMap = BlGetMemoryMap;
+    EfiLdrProtocol.GetVirtualAddress = BlGetVirtualAddress;
     EfiLdrProtocol.InitializeVirtualMemory = BlInitializeVirtualMemory;
     EfiLdrProtocol.MapVirtualMemory = BlMapVirtualMemory;
     EfiLdrProtocol.GetStack = BlGetStackPointer;

xtoskrnl/ke/krnlinit.c

@@ -26,6 +26,18 @@ KeStartXtSystem(IN PKERNEL_INITIALIZATION_BLOCK Parameters)
     /* Print some message to serial console */
     DbgPrint(L"Hello world from ExectOS kernel!\n");
 
+    /* Test kernel parameters */
+    DbgPrint(L"\n\n------ Kernel parameters block ------\n"
+             L"Loader block size: %lu\n"
+             L"Loader block version: %lu\n"
+             L"EFI Revision: %lu\n"
+             L"EFI RunTime Revision: %lu\n",
+             Parameters->Size,
+             Parameters->Version,
+             Parameters->FirmwareInformation.EfiFirmware.EfiVersion,
+             ((PEFI_RUNTIME_SERVICES) Parameters->FirmwareInformation.EfiFirmware.EfiRuntimeServices)->Hdr.Revision
+            );
+
     /* Enter infinite kernel thread loop */
     for(;;);
 }