多进程 》 A大 A virtual address ·进程状态 page number offset PC+GPRs+SP+PTBR 1 0 0 0 1 1 进程切换 2 3 3 3 -更新PTBR Address Space Page Table of User-1 of User-1 2 User 1 VA1 os pages Page Table User 2 VA1 Page Table User 3 VA1 Page Table free多进程 • 进程状态 – PC+GPRs+SP+PTBR • 进程切换 – 更新PTBR