VOID
HalDisplayString (
PUCHAR String
)
/*++
Routine Description:
This routine displays a character string on the display screen.
Arguments:
String - Supplies a pointer to the characters that are to be displayed.
Return Value:
None.
--*/
{
if (!HalpDisplayInitialized && HalpOwnsDisplay) {
//
// If somebody has called HalDisplayString before Phase 0
// initialization, we need to make sure we get our message out
// anyway. So we initialize the display before HalInitSystem does.
// HalpInitializeDisplay is smart enough to only map the video
// buffer and clear the screen the first time it is called.
//
HalpInitializeDisplay();
}
//
// Synchronize access to the display so that MP systems won't
// get garbage output due to simultaneous calls. It also prevents
// two processors from attempting to call BIOS and reset the display
// simultaneously.
//
KiAcquireSpinLock(&HalpDisplayLock);
if (HalpOwnsDisplay == FALSE) {
//
// The display has been put in graphics mode, and we need to
// reset it to text mode before we can display any text on it.
//
if (HalpResetDisplayParameters) {
HalpOwnsDisplay = HalpResetDisplayParameters(COLS, ROWS);
}
if (HalpOwnsDisplay == FALSE) {
HalpBiosDisplayReset();
}
HalpOwnsDisplay = TRUE;
HalpDoingCrashDump = TRUE;
HalpClearDisplay();
}
while (*String) {
switch (*String) {
case '\n':
HalpNextLine();
break;
case '\r':
HalpCursorX = 0;
break;
default:
HalpPutCharacter(*String);
if (++HalpCursorX == COLS) {
HalpNextLine();
}
}
++String;
}
KiReleaseSpinLock(&HalpDisplayLock);
return;
}
VOID
NTAPI
HalInitializeBios(ULONG Unknown, PLOADER_PARAMETER_BLOCK LoaderBlock)
{
PPFN_NUMBER PfnArray;
PFN_NUMBER Pfn, Last;
PMEMORY_ALLOCATION_DESCRIPTOR Descriptor;
PLIST_ENTRY ListEntry;
PMDL Mdl;
/* Allocate an MDL for 1MB */
Mdl = IoAllocateMdl(NULL, 0x100000, FALSE, FALSE, NULL);
if (!Mdl)
{
ASSERT(FALSE);
}
/* Get pointer to the pfn array */
PfnArray = MmGetMdlPfnArray(Mdl);
/* Fill the array with low memory PFNs */
for (Pfn = 0; Pfn < 0x100; Pfn++)
{
PfnArray[Pfn] = Pfn;
}
/* Loop the memory descriptors */
for (ListEntry = LoaderBlock->MemoryDescriptorListHead.Flink;
ListEntry != &LoaderBlock->MemoryDescriptorListHead;
ListEntry = ListEntry->Flink)
{
/* Get the memory descriptor */
Descriptor = CONTAINING_RECORD(ListEntry,
MEMORY_ALLOCATION_DESCRIPTOR,
ListEntry);
/* Check if the memory is in the low range */
if (Descriptor->BasePage < 0x100)
{
/* Check if the memory type is firmware */
if (Descriptor->MemoryType != LoaderFirmwarePermanent &&
Descriptor->MemoryType != LoaderSpecialMemory)
{
/* It's something else, so don't use it! */
Last = min(Descriptor->BasePage + Descriptor->PageCount, 0x100);
for (Pfn = Descriptor->BasePage; Pfn < Last; Pfn++)
{
/* Set each page to the default page */
PfnArray[Pfn] = DEFAULT_PAGE;
}
}
}
}
Mdl->MdlFlags = MDL_PAGES_LOCKED;
/* Map the MDL to system space */
x86BiosMemoryMapping = MmGetSystemAddressForMdlSafe(Mdl, HighPagePriority);
ASSERT(x86BiosMemoryMapping);
DPRINT1("memory: %p, %p\n", *(PVOID*)x86BiosMemoryMapping, *(PVOID*)(x86BiosMemoryMapping + 8));
//DbgDumpPage(x86BiosMemoryMapping, 0xc351);
x86BiosIsInitialized = TRUE;
HalpBiosDisplayReset();
}