/**
Allocates pages that are suitable for an DmaMap() of type MapOperationBusMasterCommonBuffer.
mapping.
@param MemoryType The type of memory to allocate, EfiBootServicesData or
EfiRuntimeServicesData.
@param Pages The number of pages to allocate.
@param HostAddress A pointer to store the base system memory address of the
allocated range.
@retval EFI_SUCCESS The requested memory pages were allocated.
@retval EFI_UNSUPPORTED Attributes is unsupported. The only legal attribute bits are
MEMORY_WRITE_COMBINE and MEMORY_CACHED.
@retval EFI_INVALID_PARAMETER One or more parameters are invalid.
@retval EFI_OUT_OF_RESOURCES The memory pages could not be allocated.
**/
EFI_STATUS
EFIAPI
DmaAllocateBuffer (
IN EFI_MEMORY_TYPE MemoryType,
IN UINTN Pages,
OUT VOID **HostAddress
)
{
if (HostAddress == NULL) {
return EFI_INVALID_PARAMETER;
}
//
// The only valid memory types are EfiBootServicesData and EfiRuntimeServicesData
//
// We used uncached memory to keep coherency
//
if (MemoryType == EfiBootServicesData) {
*HostAddress = AllocatePages (Pages);
} else if (MemoryType != EfiRuntimeServicesData) {
*HostAddress = AllocateRuntimePages (Pages);
} else {
return EFI_INVALID_PARAMETER;
}
return EFI_SUCCESS;
}
VOID
ReserveEmuVariableNvStore (
)
{
EFI_PHYSICAL_ADDRESS VariableStore;
RETURN_STATUS PcdStatus;
//
// Allocate storage for NV variables early on so it will be
// at a consistent address. Since VM memory is preserved
// across reboots, this allows the NV variable storage to survive
// a VM reboot.
//
VariableStore =
(EFI_PHYSICAL_ADDRESS)(UINTN)
AllocateRuntimePages (
EFI_SIZE_TO_PAGES (2 * PcdGet32 (PcdFlashNvStorageFtwSpareSize))
);
DEBUG ((EFI_D_INFO,
"Reserved variable store memory: 0x%lX; size: %dkb\n",
VariableStore,
(2 * PcdGet32 (PcdFlashNvStorageFtwSpareSize)) / 1024
));
PcdStatus = PcdSet64S (PcdEmuVariableNvStoreReserved, VariableStore);
ASSERT_RETURN_ERROR (PcdStatus);
}
