General Feature

• ram size:

  • 128 Mbite

• page table size:

  • 4096

• boot sequence

  • 0x8000_0000

Scheduler

param.h

• Fixed Limits

• Several Arrays

  • kill(pid)

• what is a page

• find argc and argv on the stack

page table

• Sv32
• Sv39 (xv6)
• Sv48

virtual address size:

Sv39

• 39 bits
• 2 ^ 39 = 512 Gbites = 0x80_0000_0000

xv6 only use 38 bits

• 38 bits
• 2 ^ 38 = 256 Gbites (0x40_0000_0000)
  = MAXVA
• address range: 0 ~ 0x3f_ffff_ffff