RAM Occupation

The ramAllocator field describes RAM occupation by the system image. The mkbootconf tool initializes the ramAllocator state. It tags as allocated the memory dedicated to:

• All RAM based system image memory banks (see "Banks").

• Global system control blocks (for example CpuContext and ChorusContext) that are mapped to non-virtual linking areas (see "Areas").

• All non-XIP segments (XIP segments are contained in memory banks) that are mapped to non-virtual linking areas (see "Areas").

The ChorusOS operating system provides a library of functions to manipulate the RamDesc objects (see "RAM Allocator interface"). RamDesc is declared in source_dir/nucleus/sys/common/src/kern/bki/ram.h. These functions allow the bootstrap program to tag any range of physical addresses with an attribute.