On 9/4/05, Rahul Iyer <idlisambar@xxxxxxxxx> wrote: > Fawad Lateef wrote: > > > > >I also want to add one thing !!!! the 0 - 896MB physical addresses can > >be calculated by subracting PAGE_OFFSET(in default (3G/1GG) it is > >0xC8000000) from the Virtual Address. So this means that for 512MB > >System the Virtual addresses for Kernel will be from 3G to 3G + > >PAGE_OFFSET + 512MB ...... (CMIIW) > > > > > > > > > I'm not sure i understand this. PAGE_OFFSET is defined as 3G (on x86). > See here: http://lxr.linux.no/source/include/asm-i386/page.h#L131 > Now if you want to know where Physical Address x is mapped in kernel > address space, the virtual address is PAGE_OFFSET + x. > > so 300MB is 3G + 300MB > :ohh I wrote wrong .... I was actually want to mention to PAGE_OFFSET+512MB .... ( not 3G+PAGE_OFFSET+512MB) ............ So 300MB is PAGE_OFFSET + 300MB = (3G + 300M + 128M) of last virtual address -- Fawad Lateef -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
