Hi All, I just started learning Linux Virtual Memory Management Subsystem. I see the memory is divided into three zones. Comments in file mm/mmzone.h
/* * ZONE_DMA < 16 MB ISA DMA capable memory * ZONE_NORMAL 16-896 MB direct mapped by the kernel * ZONE_HIGHMEM > 896 MB only page cache and user processes */ Here second comment (ZONE_NORMAL) says that it is directly mapped by kernel. Could anybody please tell me what does direct mean here? Does this mean Physical address = Virtual Address??? Thanks - Arvind
