4 ms·
If the kernel has no sensitive state (believable for a microkernel), what matters is whether it maps the physical memory in its kernel space.
by cesarb 9y ago
If the kernel has no sensitive state (believable for a microkernel), what matters is whether it maps the physical memory in its kernel space.
- dfox 9y agoQNX 6.5 apparently maps first 256MB of physical memory into kernel space at fixed location. Also I believe that QNX's kernel memory contains region that maps to pages of user space memory of other processes (as part of the message passing mechanism, but I'm not exactly sure that I understand correctly how it actually works).