mm/kmm_map: Add support to dynamically map pages into kernel virtual memory

mirror of https://github.com/apache/nuttx.git synced 2026-05-31 05:55:46 +08:00

This adds functionality to map pages dynamically into kernel virtual
memory. This allows implementing I/O remap for example, which is a useful
(future) feature.

Now, the first target is to support mapping user pages for the kernel.

Why? There are some userspace structures that might be needed when the
userspace process is not running. Semaphores are one such example. Signals
and the WDT timeout both need access to the user semaphore to work
properly. Even though for this only obtaining the kernel addressable
page pool virtual address is needed, for completeness a procedure is
provided to map several pages.

This commit is contained in:

Ville Juven

2023-04-13 16:25:22 +03:00

committed by

Xiang Xiao

parent 223c5a3722

commit 0476e30a6d

9 changed files with 763 additions and 0 deletions

									
										mm/Makefile
									
		+1
		
												View File
												
				@@ -34,6 +34,7 @@ include kasan/Make.defs

				include ubsan/Make.defs

				include tlsf/Make.defs

				include map/Make.defs

				include kmap/Make.defs

				BINDIR ?= bin