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using Ryujinx.HLE.Exceptions;
using System;
using System.Collections.ObjectModel;
using System.IO;
namespace Ryujinx.HLE.Loaders.Npdm
{
class KernelAccessControl
{
public ReadOnlyCollection<KernelAccessControlItem> Items;
public KernelAccessControl(Stream Stream, int Offset, int Size)
{
Stream.Seek(Offset, SeekOrigin.Begin);
BinaryReader Reader = new BinaryReader(Stream);
KernelAccessControlItem[] Items = new KernelAccessControlItem[Size / 4];
for (int Index = 0; Index < Size / 4; Index++)
{
uint Descriptor = Reader.ReadUInt32();
//Ignore the descriptor.
if (Descriptor == 0xffffffff)
{
continue;
}
Items[Index] = new KernelAccessControlItem();
int LowBits = 0;
while ((Descriptor & 1) != 0)
{
Descriptor >>= 1;
LowBits++;
}
Descriptor >>= 1;
switch (LowBits)
{
//Kernel flags.
case 3:
{
Items[Index].HasKernelFlags = true;
Items[Index].HighestThreadPriority = (Descriptor >> 0) & 0x3f;
Items[Index].LowestThreadPriority = (Descriptor >> 6) & 0x3f;
Items[Index].LowestCpuId = (Descriptor >> 12) & 0xff;
Items[Index].HighestCpuId = (Descriptor >> 20) & 0xff;
break;
}
//Syscall mask.
case 4:
{
Items[Index].HasSvcFlags = true;
Items[Index].AllowedSvcs = new bool[0x80];
int SysCallBase = (int)(Descriptor >> 24) * 0x18;
for (int SysCall = 0; SysCall < 0x18 && SysCallBase + SysCall < 0x80; SysCall++)
{
Items[Index].AllowedSvcs[SysCallBase + SysCall] = (Descriptor & 1) != 0;
Descriptor >>= 1;
}
break;
}
//Map IO/Normal.
case 6:
{
ulong Address = (Descriptor & 0xffffff) << 12;
bool IsRo = (Descriptor >> 24) != 0;
if (Index == Size / 4 - 1)
{
throw new InvalidNpdmException("Invalid Kernel Access Control Descriptors!");
}
Descriptor = Reader.ReadUInt32();
if ((Descriptor & 0x7f) != 0x3f)
{
throw new InvalidNpdmException("Invalid Kernel Access Control Descriptors!");
}
Descriptor >>= 7;
ulong MmioSize = (Descriptor & 0xffffff) << 12;
bool IsNormal = (Descriptor >> 24) != 0;
Items[Index].NormalMmio.Add(new KernelAccessControlMmio(Address, MmioSize, IsRo, IsNormal));
Index++;
break;
}
//Map Normal Page.
case 7:
{
ulong Address = Descriptor << 12;
Items[Index].PageMmio.Add(new KernelAccessControlMmio(Address, 0x1000, false, false));
break;
}
//IRQ Pair.
case 11:
{
Items[Index].Irq.Add(new KernelAccessControlIrq(
(Descriptor >> 0) & 0x3ff,
(Descriptor >> 10) & 0x3ff));
break;
}
//Application Type.
case 13:
{
Items[Index].HasApplicationType = true;
Items[Index].ApplicationType = (int)Descriptor & 7;
break;
}
//Kernel Release Version.
case 14:
{
Items[Index].HasKernelVersion = true;
Items[Index].KernelVersionRelease = (int)Descriptor;
break;
}
//Handle Table Size.
case 15:
{
Items[Index].HasHandleTableSize = true;
Items[Index].HandleTableSize = (int)Descriptor;
break;
}
//Debug Flags.
case 16:
{
Items[Index].HasDebugFlags = true;
Items[Index].AllowDebug = ((Descriptor >> 0) & 1) != 0;
Items[Index].ForceDebug = ((Descriptor >> 1) & 1) != 0;
break;
}
}
}
this.Items = Array.AsReadOnly(Items);
}
}
}
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