private void CreateHeap()
{
// Required so that page allocations by new Thread don't create conflicts
ProcessManager.EnableKernelAccessToProcessMemory(this);
#if PROCESS_TRACE
BasicConsole.WriteLine("Allocating memory for heap...");
#endif
// Allocate memory for new heap
uint heapPages = 64; // 256KiB, page-aligned
FOS_System.HeapBlock *heapPtr = (FOS_System.HeapBlock *)VirtMemManager.MapFreePages(
UserMode ? VirtMemImpl.PageFlags.None :
VirtMemImpl.PageFlags.KernelOnly, (int)heapPages);
#if PROCESS_TRACE
BasicConsole.WriteLine("Generating physical addresses...");
#endif
uint[] pAddrs = new uint[heapPages];
for (uint currPtr = (uint)heapPtr, i = 0; i < heapPages; currPtr += 4096, i++)
{
pAddrs[i] = VirtMemManager.GetPhysicalAddress(currPtr);
}
#if PROCESS_TRACE
BasicConsole.WriteLine("Adding memory to current process (kernel task) layout...");
#endif
// Add heap memory to current (kernel) process's memory
// - Makes sure it won't be mapped out during initialisation
ProcessManager.CurrentProcess.TheMemoryLayout.AddDataPages((uint)heapPtr, pAddrs);
// Force reload of the memory layout
ProcessManager.CurrentProcess.TheMemoryLayout.Load(ProcessManager.CurrentProcess.UserMode);
#if PROCESS_TRACE
BasicConsole.WriteLine("Initialising heap...");
#endif
// Initialise the heap
FOS_System.Heap.InitBlock(heapPtr, heapPages * 4096, 32);
#if PROCESS_TRACE
BasicConsole.WriteLine("Adding memory to layout...");
#endif
// Add allocated new process's memory to layout
TheMemoryLayout.AddDataPages((uint)heapPtr, pAddrs);
#if PROCESS_TRACE
BasicConsole.WriteLine("Removing memory from current process (kernel task) layout...");
#endif
ProcessManager.DisableKernelAccessToProcessMemory(this);
#if PROCESS_TRACE
BasicConsole.WriteLine("Setting heap pointer...");
#endif
// Set heap pointer
HeapPtr = heapPtr;
}
private void CreateHeap()
{
#if PROCESS_TRACE
BasicConsole.WriteLine("Allocating memory for heap...");
#endif
// Allocate memory for new heap
uint heapPages = 64; // 256KiB, page-aligned
FOS_System.HeapBlock* heapPtr = (FOS_System.HeapBlock*)VirtMemManager.MapFreePages(
UserMode ? VirtMemImpl.PageFlags.None :
VirtMemImpl.PageFlags.KernelOnly, (int)heapPages);
#if PROCESS_TRACE
BasicConsole.WriteLine("Generating physical addresses...");
#endif
uint[] pAddrs = new uint[heapPages];
for (uint currPtr = (uint)heapPtr, i = 0; i < heapPages; currPtr += 4096, i++)
{
pAddrs[i] = VirtMemManager.GetPhysicalAddress(currPtr);
}
#if PROCESS_TRACE
BasicConsole.WriteLine("Adding memory to current process (kernel task) layout...");
#endif
// Add heap memory to current (kernel) process's memory
// - Makes sure it won't be mapped out during initialisation
ProcessManager.CurrentProcess.TheMemoryLayout.AddDataPages((uint)heapPtr, pAddrs);
// Force reload of the memory layout
ProcessManager.CurrentProcess.TheMemoryLayout.Load(ProcessManager.CurrentProcess.UserMode);
#if PROCESS_TRACE
BasicConsole.WriteLine("Initialising heap...");
#endif
// Initialise the heap
FOS_System.Heap.InitBlock(heapPtr, heapPages * 4096, 32);
#if PROCESS_TRACE
BasicConsole.WriteLine("Adding memory to layout...");
#endif
// Add allocated new process's memory to layout
TheMemoryLayout.AddDataPages((uint)heapPtr, pAddrs);
#if PROCESS_TRACE
BasicConsole.WriteLine("Removing memory from current process (kernel task) layout...");
#endif
// Remove heap memory from current (kernel) process's memory
ProcessManager.CurrentProcess.TheMemoryLayout.RemovePages((uint)heapPtr, heapPages);
#if PROCESS_TRACE
BasicConsole.WriteLine("Setting heap pointer...");
#endif
// Set heap pointer
HeapPtr = heapPtr;
}