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)
        FFBFFFFF        KERNEND         ((KPTDI+NKPDE) << PDRSHIFT) - 1
3FD     FF400000        .
3FC     FF000000        .
3FB     FEC00000        .
3FA     FE800000        .
3F9     FE400000        .
        FE000000        KERNBASE        KPTDI << PDRSHIFT
3F8     FE000000        KPTDI           #define (APTDPTDI-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 1.5 1993/10/15 06:35:46 rgrimes Exp $