公开(公告)号：US20150082000A1

公开(公告)日：2015-03-19

申请号：US14462774

申请日：2014-08-19

Applicant: Samsung Electronics Co., Ltd.

Inventor： Sung-Min Hong ,  Sim Ji Lee ,  JaeYoung Hur ,  JiWoong Kwon ,  Il Park ,  Jong-Jin Lee ,  Jinyong Jung

IPC: G06F12/10 ,  G06F12/08

CPC classification number: G06F12/0862 ,  G06F12/1009 ,  G06F12/1027 ,  G06F2212/507 ,  G06F2212/6022 ,  G06F2212/654 ,  G06F2212/68 ,  G06F2212/681

Abstract: A memory management unit comprises an address translation unit that receives a memory access request as a virtual address and translates the virtual address to a physical address. A translation lookaside buffer stores page descriptors of a plurality of physical addresses, the address translation unit determining whether a page descriptor of a received virtual address is present in the translation lookaside buffer. A prefetch buffer stores page descriptors of the plurality of physical addresses. The address translation unit, in the event the page descriptor of the received virtual address is not present in the translation lookaside buffer, further determines whether the page descriptor of the received virtual address is present in the prefetch buffer; updates the translation lookaside buffer with the page descriptor in response to the determination; and performs a translation of the virtual address to a physical address using the page descriptor.

Abstract translation: 存储器管理单元包括地址转换单元，其接收作为虚拟地址的存储器访问请求并将虚拟地址转换为物理地址。 翻译后备缓冲器存储多个物理地址的页面描述符，地址转换单元确定所接收的虚拟地址的页面描述符是否存在于翻译后备缓冲器中。 预取缓冲器存储多个物理地址的页面描述符。 地址转换单元，在接收到的虚拟地址的页面描述符不存在于翻译后备缓冲器中的情况下，进一步确定接收的虚拟地址的页面描述符是否存在于预取缓冲器中; 响应于确定，用页面描述符更新翻译后备缓冲器; 并使用页面描述符执行虚拟地址到物理地址的转换。

公开(公告)号：US09645934B2

公开(公告)日：2017-05-09

申请号：US14462774

申请日：2014-08-19

Applicant: Samsung Electronics Co., Ltd.

Inventor： Sung-Min Hong ,  Sim Ji Lee ,  JaeYoung Hur ,  JiWoong Kwon ,  Il Park ,  Jong-Jin Lee ,  Jinyong Jung

IPC: G06F12/10 ,  G06F12/08 ,  G06F12/0862 ,  G06F12/1009 ,  G06F12/1027

CPC classification number: G06F12/0862 ,  G06F12/1009 ,  G06F12/1027 ,  G06F2212/507 ,  G06F2212/6022 ,  G06F2212/654 ,  G06F2212/68 ,  G06F2212/681

Abstract: A page descriptor can be stored in advance in a memory management unit under various conditions so that an address translation overhead can be reduced. The memory management unit comprises an address translation unit that receives a memory access request as a virtual address and translates the virtual address to a physical address. A translation lookaside buffer (TLB) stores page descriptors of a plurality of physical addresses, the address translation unit determining whether a page descriptor corresponding to a received virtual address is present in the translation lookaside buffer. A prefetch buffer stores page descriptors of the plurality of physical addresses. The address translation unit, in the event the page descriptor corresponding to the received virtual address is not present in the translation lookaside buffer, further determines whether the page descriptor corresponding to the received virtual address is present in the prefetch buffer; updates the translation lookaside buffer with the page descriptor corresponding to the received virtual address; and performs a translation of the virtual address to a physical address using the page descriptor corresponding to the received virtual address. The prefetch buffer may include sub-prefetch buffers, and may be updated based on access direction information.