公开(公告)号：US20160239209A1

公开(公告)日：2016-08-18

申请号：US15043023

申请日：2016-02-12

Applicant: GOOGLE INC.

Inventor： Vyacheslav Vladimirovich MALYUGIN ,  Luigi SEMENZATO ,  Choon Ping CHNG ,  Santhosh RAO ,  Shinye SHIU

IPC: G06F3/06

CPC classification number: G06F3/064 ,  G06F3/0604 ,  G06F3/0631 ,  G06F3/0673 ,  G06F12/023 ,  G06F12/0804 ,  G06F12/0871 ,  G06F12/0888 ,  G06F2003/0691 ,  G06F2212/401 ,  Y02B70/30 ,  Y02D10/13

Abstract: Provided are methods and systems for memory decompression using a hardware decompressor that minimizes or eliminates the involvement of software. Custom decompression hardware is added to the memory subsystem, where the decompression hardware handles read accesses caused by, for example, cache misses or requests from devices to compressed memory blocks, by reading a compressed block, decompressing it into an internal buffer, and returning the requested portion of the block. The custom hardware is designed to determine if the block is compressed, and determine the parameters of compression, by checking unused high bits of the physical address of the access. This allows compression to be implemented without additional metadata, because the necessary metadata can be stored in unused bits in the existing page table structures.

Abstract translation: 提供了使用最小化或消除软件参与的硬件解压缩器来进行存储器解压缩的方法和系统。 自定义解压缩硬件被添加到存储器子系统中，其中解压缩硬件处理由例如高速缓存未命中或从设备到压缩存储器块的请求引起的读取访问，通过读取压缩块，将其解压缩到内部缓冲器中并返回 块的请求部分。 定制硬件设计用于通过检查访问的物理地址的未使用的高位来确定块是否被压缩，并确定压缩参数。 这允许在没有附加元数据的情况下实现压缩，因为必要的元数据可以存储在现有页表结构中的未使用的位中。

公开(公告)号：US20170242614A1

公开(公告)日：2017-08-24

申请号：US15394621

申请日：2016-12-29

Applicant: GOOGLE INC.

Inventor： Santhosh RAO ,  Sameer NANDA ,  Vyacheslav Vladimirovich MALYUGIN ,  Luigi SEMENZATO ,  Aaron DURBIN ,  Keith Robert PFLEDERER ,  Hsiao-Heng Kelin LEE ,  Rahul Jagdish THAKUR

IPC: G06F3/06

CPC classification number: G06F3/0638 ,  G06F3/0608 ,  G06F3/0656 ,  G06F3/0673 ,  G06F12/023 ,  G06F12/0804 ,  G06F2212/1044 ,  G06F2212/401 ,  H03M7/30 ,  H03M7/6011 ,  H03M7/6058

Abstract: Systems, devices, and methods for managing fragmentation in hardware-assisted compression of data in physical computer memory which may result in reduced internal fragmentation. An example computer-implemented method comprises: providing, by a memory management program to compression hardware, a compression command including an address in physical computer memory of data to be compressed and a list of at least two available buffers for storing compressed data; using, by the compression hardware, the address included in the compression command to retrieve uncompressed data; compressing the uncompressed data; and selecting, by the compression hardware, from the list of at least two available buffers, at least two buffers for storing compressed data based on an amount of space that would remain if the compressed data were stored in the at least two buffers, wherein each of the at least two selected buffers differs in size from at least one other of the selected buffers.

公开(公告)号：US20170109533A1

公开(公告)日：2017-04-20

申请号：US15335101

申请日：2016-10-26

Applicant: GOOGLE INC.

Inventor： Gaurav SHAH ,  William A. DREWRY ,  Randall SPANGLER ,  Ryan TABONE ,  Sumit GWALANI ,  Luigi SEMENZATO

IPC: G06F21/57 ,  G06F21/64 ,  H04L9/30 ,  H04L9/32

CPC classification number: G06F21/575 ,  G06F21/554 ,  G06F21/64 ,  G06F21/74 ,  H04L9/30 ,  H04L9/3236 ,  H04L9/3247

Abstract: Methods and apparatus for verifying a boot process of a computing system are disclosed. An example computer-implemented method includes reading, by a computing system during a boot process, a header section of a read-write portion of firmware of the computing system. The example method further includes generating, using a first cryptographic hash algorithm, a message digest corresponding with the header. The example method also includes decrypting, using a first public-key, an encrypted signature corresponding with the header. The example method still further includes comparing the message digest corresponding with the header and the decrypted signature corresponding with the header. In the event the message digest corresponding with the header and the decrypted signature corresponding with the header match, the example method includes continuing the boot process. In the event the message digest corresponding with the header and the decrypted signature corresponding with the header do not match, the example method includes halting the boot process.