Add Memory::GetUserVirtualArea function to the kernel.

sortix/include/sortix/kernel/memorymanagement.h

@@ -83,6 +83,7 @@ namespace Sortix
 		addr_t GetKernelStack();
 		size_t GetKernelStackSize();
 		void GetKernelVirtualArea(addr_t* from, size_t* size);
+		void GetUserVirtualArea(uintptr_t* from, size_t* size);
 	}
 }
 

sortix/x64/memorymanagement.cpp

@@ -192,6 +192,12 @@ namespace Sortix
 			*size = VIRTUAL_AREA_UPPER - VIRTUAL_AREA_LOWER;
 		}
 
+		void GetUserVirtualArea(uintptr_t* from, size_t* size)
+		{
+			*from = 0x400000; // 4 MiB.
+			*size = 0x800000000000 - *from; // 128 TiB - 4 MiB.
+		}
+
 		addr_t GetKernelStack()
 		{
 			return KERNEL_STACK_START;

sortix/x86/memorymanagement.cpp

@@ -176,6 +176,12 @@ namespace Sortix
 			*size = VIRTUAL_AREA_UPPER - VIRTUAL_AREA_LOWER;
 		}
 
+		void GetUserVirtualArea(uintptr_t* from, size_t* size)
+		{
+			*from = 0x400000; // 4 MiB.
+			*size = 0x80000000 - *from; // 2 GiB - 4 MiB.
+		}
+
 		addr_t GetKernelStack()
 		{
 			return KERNEL_STACK_START;