Operating System IX, Physical Memory Map

#000003, Stephanos S. Io, 07/04/2010, Rev 0.

1. Factors

i.          Global Descriptor Table (GDT) - consists of 32 descriptors (each descriptor is 16-byte.).

ii.        Interrupt Descriptor Table (IDT) - consists of 256 descriptors (each descriptor is 16-byte.).

iii.      Task State Segment (TSS) - total 104-byte

iv.        System Operating Information Descriptor (SOID) - 8-KiB

v.          Initialiser Image - 1-MiB

vi.        Kernel Image - 2-MiB

vii.      Kernel Process Default Memory Pool - 8-MiB

viii.    Page Tables - varies

ix.        Physical Page Allocation Table (PPAT) - varies

2. Considered Exceptions

i.          The ISA Memory Hole at 15 MiB-16 MiB was not considered because the modern PC systems do not use the ISA buses any more.

ii.        There may be more memory holes in the middle of the address space. In this physical memory map, the extra non-standard holes are not considered, but the Physical Page Manager will automatically block them according to the BIOS information.

3. Physical Memory Map

Var1 = varies on the size of the page tables required to map the whole Physical Address Area into the Kernel Virtual Address Area.

Var2 = varies on the size of the PPAT.