Naming of typed memory regions

The names of typed memory regions are derived directly from the names of the asinfo segments. The asinfo section itself describes a hierarchy, and so the naming of typed memory object is a hierarchy. The name may contain intermediate / characters that are considered as path component separators.

Here's a sample system configuration:

The name you pass to posix_typed_mem_open() follows the above naming convention. If the name starts with a leading /, an exact match is done. POSIX allows an implementation to define what happens when the name doesn't start with a leading slash; in QNX Neutrino, a tail match is done on the pathname components specified.

Here are some examples of how posix_typed_mem_open() resolves names, using the above sample configuration:

You can also use ampersands and vertical bars (& and |) between segments to specify intersections and unions, respectively. You can specify an arbitrary number of them; they're evaluated from left to right, but parentheses aren't supported. For example, below4G&sysram gives you the intersection of all physical address ranges for below4G with all physical address ranges for sysram. If you have two memory regions, one being /ram/below4G with addresses from 0 to 4 GB, and the other being /ram/sysram with addresses from 1 GB to 6 GB, then below4G&sysram gives pages in the range 1 GB to 4 GB.