Removed all patch kit headers, sccsid and rcsid strings, put $Id$ in, some

[unix-history] / sys / i386 / doc / vm_layout.doc

Physical Memory Layout:

NOT YET DONE



Virtual Memory Layout:

Page Table Directories, and how they relate to the vm address space
Note: PTDI stands for Page Table Directory Index.

PTDI    Address         pmap.h/param.h  Calculation to locate it in vm space
--------------------------------------------------------------------------------
       FFFFF000        APTD            APTmap + (APTDPTDI * NBPG)
       FFC00000        APTmap          APTDPTDI << PDRSHIFT
3FF     FFC00000        APTDPTDI        #define (NPTEPG-1)
3FE     FF800000        .
3FD     FF400000        .
3FC     FF000000        .
3FB     FEC00000        RSVDPTDI        #define (APTDPTDI-4)
       FEBFFFFF        KERNEND         ((KPTDI+NKPDE) << PDRSHIFT) - 1
3FA     FE800000        .
3F9     FE400000        .
       FE000000        KERNBASE        KPTDI << PDRSHIFT
3F8     FE000000        KPTDI           #define (RSVDPTDI-NKPDE)
       FDFF8000        Sysmap          PTmap + (KPTDI * NBPG)
       FDFF7FF8        APTpde          PTD + (APTDPTDI * sizeof(pde))
       FDFF7FDC        PTDpde          PTD + (PTDPTDI * sizeof(pde))
       FDFF7000        PTD             PTmap + (PTDPTDI * NBPG)
       FDC00000        PTmap           PTDPTDI << PDRSHIFT
3F7     FDC00000        PTDPTDI         #define (KPTDI-1)

$Id: vm_layout.doc,v 1.4 1993/10/12 15:10:23 rgrimes Exp $