Kernel Address Space

The 64-bit kernel provides a common user and kernel 64-bit address space.

Kernel Address Space Organization
The organization of kernel space differs between hardware systems.
Temporary Attachment
The 64-bit kernel provides kernel extensions with the capability to temporarily attach virtual memory segments to the kernel space for the current thread of kernel mode execution. This capability is provided through the vm_att and vm_det services.
Global Regions
The 64-bit kernel provides kernel extensions with the capability to create global regions within the kernel address space. Once created, a region is globally accessible to all kernel code until it is destroyed. Regions may be created with unique characteristics, for example, page protection, that suit kernel extension requirements and are different from the global virtual memory allocated from the kernel_heap.

Parent topic: 64-bit Kernel Extension Programming Environment