public uint Id; // four-digit hex number part of its name Boot####
// public uint Attributes;
// public string FriendlyName; //FriendlyNameOffset: ULONG,
// public string BootFilePath; //BootFilePathOffset: ULONG,
// OsOptionsLength: ULONG,
// OsOptions: [UCHAR; 1],
public unsafe static NtEfiBootEntry MarshalFromNative(IntPtr data)
{
var result = new NtEfiBootEntry();
result.Id = *(uint *)(data + 8);
return(result);
}
static List <string> read_all_boot_entry_names()
{
var result = new List <string>();
uint size = 0;
var buffer = IntPtr.Zero;
var status = Natives.NtEnumerateBootEntries(buffer, ref size);
if (status != NtStatus.BufferTooSmall)
{
if (status >= 0)
{
// Somehow there are no boot entries in NVRAM.
Console.WriteLine("Somehow there are no boot entries in NVRAM.");
return(result);
}
else
{
// An unexpected error occurred
Console.WriteLine("An unexpected error occurred.");
throw new Exception();
}
}
buffer = Marshal.AllocHGlobal((int)size);
status = Natives.NtEnumerateBootEntries(buffer, ref size);
if (status < 0)
{
// An unexpected error occurred
Console.WriteLine("An unexpected error occurred. 2");
Marshal.FreeHGlobal(buffer);
throw new Exception();
}
var currPtr = buffer;
for (var x = NtEfiBootEntryList.MarshalFromNative(currPtr); ; x = NtEfiBootEntryList.MarshalFromNative(currPtr += (int)x.NextEntryOffset))
{
var id = NtEfiBootEntry.MarshalFromNative(x.BootEntry).Id;
result.Add($"Boot{id.ToString("X4")}");
if (x.NextEntryOffset == 0)
{
break;
}
}
Marshal.FreeHGlobal(buffer);
return(result);
}