公开(公告)号：US20110113216A1

公开(公告)日：2011-05-12

申请号：US12674669

申请日：2007-08-31

申请人： Kouichi Toita ,  Nobutoshi Higaki ,  Toshihiro Hishida

发明人： Kouichi Toita ,  Nobutoshi Higaki ,  Toshihiro Hishida

IPC分类号： G06F12/10 ,  G06F12/00

CPC分类号： G06F12/0638 ,  G06F12/0292 ,  G06F12/10

摘要： An information processing apparatus includes: a ROM for storing a program therein; a RAM for temporarily storing therein the program read from the ROM; a program execution unit that is adapted to read and execute the program from the ROM or the RAM; a memory management unit that translates a virtual address output by the program execution unit to a physical address of the ROM or the RAM; a page table storage unit for storing therein a page table which is referred to by the memory management unit, and in which mapping data of a virtual address with a physical address of the ROM or the RAM corresponding to the virtual address is stored; a detection unit that detects change of an event in the information processing apparatus; an operation switching unit that is adapted to instruct, when the detection unit detects the change of the event during a ROM-operation in which the program execution unit reads the program from the ROM, switching from the ROM-operation to a RAM-operation in which the program execution unit reads the program from the RAM; and a page table updating unit that updates the page table which is referred to by the memory management unit, depending on the instruction of the operation switching unit.

摘要翻译： 一种信息处理设备，包括：用于存储程序的ROM; 用于暂时存储从ROM读取的程序的RAM; 程序执行单元，适于从ROM或RAM读取和执行程序; 存储器管理单元，将由程序执行单元输出的虚拟地址转换为ROM或RAM的物理地址; 页表存储单元，用于在其中存储由存储器管理单元参考的页表，并且存储具有与虚拟地址相对应的ROM或RAM的物理地址的虚拟地址的映射数据; 检测单元，其检测所述信息处理设备中的事件的变化; 操作切换单元，其用于在所述检测单元检测到所述程序执行单元从ROM读取程序的ROM操作期间检测到所述事件的变化时，指示从所述ROM操作切换到RAM操作 程序执行单元从RAM读取程序; 以及页表更新单元，其根据操作切换单元的指示来更新由存储器管理单元参考的页表。