公开(公告)号：US11294809B2

公开(公告)日：2022-04-05

申请号：US16115067

申请日：2018-08-28

Applicant: Intel Corporation

Inventor： Jason W. Brandt ,  Robert S. Chappell ,  Jesus Corbal ,  Edward T. Grochowski ,  Stephen H. Gunther ,  Buford M. Guy ,  Thomas R. Huff ,  Christopher J. Hughes ,  Elmoustapha Ould-Ahmed-Vall ,  Ronak Singhal ,  Seyed Yahya Sotoudeh ,  Bret L. Toll ,  Lihu Rappoport ,  David Papworth ,  James D. Allen

IPC: G06F12/0831 ,  G06F12/1027 ,  G06F12/1009 ,  G06F9/30

Abstract: Embodiments of an invention a processor architecture are disclosed. In an embodiment, a processor includes a decoder, an execution unit, a coherent cache, and an interconnect. The decoder is to decode an instruction to zero a cache line. The execution unit is to issue a write command to initiate a cache line sized write of zeros. The coherent cache is to receive the write command, to determine whether there is a hit in the coherent cache and whether a cache coherency protocol state of the hit cache line is a modified state or an exclusive state, to configure a cache line to indicate all zeros, and to issue the write command toward the interconnect. The interconnect is to, responsive to receipt of the write command, issue a snoop to each of a plurality of other coherent caches for which it must be determined if there is a hit.

公开(公告)号：US11126438B2

公开(公告)日：2021-09-21

申请号：US16452955

申请日：2019-06-26

Applicant: Intel Corporation

Inventor： Srikanth Srinivasan ,  Thomas Mullins ,  Ammon Christiansen ,  James Hadley ,  Robert S. Chappell ,  Sean Mirkes

IPC: G06F9/22 ,  G06F9/38 ,  G06F9/48

Abstract: In one embodiment, a reservation station of a processor includes: a plurality of first lanes having a plurality of entries to store information for instructions having in-order dependencies; a variable latency tracking table including a second plurality of entries to store information for instructions having a variable latency; and a scheduler circuit to access a head entry of the plurality of first lanes to schedule, for execution on at least one execution unit, at least one instruction from the head entry of at least one of the plurality of first lanes. Other embodiments are described and claimed.

公开(公告)号：US20220335126A1

公开(公告)日：2022-10-20

申请号：US17590470

申请日：2022-02-01

Applicant: Intel Corporation

Inventor： Robert S. Chappell ,  Jared W. Stark, IV ,  Joseph Nuzman ,  Stephen Robinson ,  Jason W. Brandt

IPC: G06F21/55 ,  G06F21/62 ,  G06F9/48 ,  G06F12/0802 ,  G06F9/30

Abstract: Systems, methods, and apparatuses relating to microarchitectural mechanisms for the prevention of side-channel attacks are disclosed herein. In one embodiment, a processor includes a core having a plurality of physical contexts to execute a plurality of threads, a plurality of structures shared by the plurality of threads, a context mapping structure to map context signatures to respective physical contexts of the plurality of physical contexts, each physical context to identify and differentiate state of the plurality of structures, and a context manager circuit to, when one or more of a plurality of fields that comprise a context signature is changed, search the context mapping structure for a match to another context signature, and when the match is found, a physical context associated with the match is set as an active physical context for the core.

公开(公告)号：US20220237123A1

公开(公告)日：2022-07-28

申请号：US17712632

申请日：2022-04-04

Applicant: Intel Corporation

Inventor： Jason W. Brandt ,  Robert S. Chappell ,  Jesus Corbal ,  Edward T. Grochowski ,  Stephen H. Gunther ,  Buford M. Guy ,  Thomas R. Huff ,  Christopher J. Hughes ,  Elmoustapha Ould-Ahmed-Vall ,  Ronak Singhal ,  Seyed Yahya Sotoudeh ,  Bret L. Toll ,  Lihu Rappoport ,  David B. Papworth ,  James D. Allen

IPC: G06F12/0831 ,  G06F12/1027 ,  G06F12/1009 ,  G06F9/30

Abstract: Embodiments of an invention a processor architecture are disclosed. In an embodiment, a processor includes a decoder, an execution unit, a coherent cache, and an interconnect. The decoder is to decode an instruction to zero a cache line. The execution unit is to issue a write command to initiate a cache line sized write of zeros. The coherent cache is to receive the write command, to determine whether there is a hit in the coherent cache and whether a cache coherency protocol state of the hit cache line is a modified state or an exclusive state, to configure a cache line to indicate all zeros, and to issue the write command toward the interconnect. The interconnect is to, responsive to receipt of the write command, issue a snoop to each of a plurality of other coherent caches for which it must be determined if there is a hit.

公开(公告)号：US10678712B2

公开(公告)日：2020-06-09

申请号：US16272794

申请日：2019-02-11

Applicant: Intel Corporation

Inventor： Robert S. Chappell ,  John W. Faistl ,  Hermann W. Gartler ,  Michael D. Tucknott ,  Rajesh S. Parthasarathy ,  David W. Burns

IPC: G06F12/14 ,  G06F13/42 ,  G06F9/52 ,  G06F12/0815 ,  G06F12/0842 ,  G06F12/126 ,  G06F12/0862

Abstract: A method is described that includes detecting that an instruction of a thread is a locked instruction. The instruction also includes determining that execution of said instruction includes imposing a bus lock. The instruction also include executing a bus lock assistance function in response to said determining, said bus lock assistance function including a function associated with said bus lock other than implementation of a bus lock protocol.

公开(公告)号：US09733939B2

公开(公告)日：2017-08-15

申请号：US13631664

申请日：2012-09-28

Applicant: Intel Corporation

Inventor： Vijaykumar Balaram Kadgi ,  James D. Hadley ,  Avinash Sodani ,  Matthew C. Merten ,  Morris Marden ,  Joseph A. McMahon ,  Grace C. Lee ,  Laura A. Knauth ,  Robert S. Chappell ,  Fariborz Tabesh

IPC: G06F9/38 ,  G06F9/30

CPC classification number: G06F9/30105 ,  G06F9/384

Abstract: A processor includes a processing unit including a storage module having stored thereon a physical reference list for storing identifications of physical registers that have been referenced by multiple logical registers, and a reclamation module for reclaiming physical registers to a free list based on a count of each of the physical registers on the physical reference list.

公开(公告)号：US20160070651A1

公开(公告)日：2016-03-10

申请号：US14481266

申请日：2014-09-09

Applicant: Intel Corporation

Inventor： Stanislav Shwartsman ,  Robert S. Chappell ,  Ronak Singhal ,  Ryan L. Carlson ,  Raanan Sade ,  Omar M. Shaikh ,  Liron Zur ,  Yiftach Gilad

IPC: G06F12/08

CPC classification number: G06F12/0897 ,  G06F12/0862 ,  G06F2212/1021 ,  G06F2212/402 ,  G06F2212/602

Abstract: A processor includes a cache hierarchy and an execution unit. The cache hierarchy includes a lower level cache and a higher level cache. The execution unit includes logic to issue a memory operation to access the cache hierarchy. The lower level cache includes logic to determine that a requested cache line of the memory operation is unavailable in the lower level cache, determine that a line fill buffer of the lower level cache is full, and initiate prefetching of the requested cache line from the higher level cache based upon the determination that the line fill buffer of the lower level cache is full. The line fill buffer is to forward miss requests to the higher level cache.

Abstract translation: 处理器包括缓存层级和执行单元。 高速缓存层级包括较低级别的缓存和较高级别的高速缓存。 执行单元包括发出存储器操作以访问高速缓存层级的逻辑。 下级高速缓存包括确定存储器操作的所请求的高速缓存行在下级高速缓存中不可用的逻辑，确定较低级高速缓存的行填充缓冲区已满，并且从较高级缓存启动所请求的高速缓存行的预取 基于下级缓存的行填充缓冲器的确定已满的高级缓存。 行填充缓冲区是将错误请求转发到更高级别的缓存。

公开(公告)号：US12236243B2

公开(公告)日：2025-02-25

申请号：US18138591

申请日：2023-04-24

Applicant: Intel Corporation

Inventor： Jason W. Brandt ,  Deepak K. Gupta ,  Rodrigo Branco ,  Joseph Nuzman ,  Robert S. Chappell ,  Sergiu Ghetie ,  Wojciech Powiertowski ,  Jared W. Stark, IV ,  Ariel Sabba ,  Scott J. Cape ,  Hisham Shafi ,  Lihu Rappoport ,  Yair Berger ,  Scott P. Bobholz ,  Gilad Holzstein ,  Sagar V. Dalvi ,  Yogesh Bijlani

IPC: G06F9/38 ,  G06F9/30

Abstract: Methods and apparatuses relating to mitigations for speculative execution side channels are described. Speculative execution hardware and environments that utilize the mitigations are also described. For example, three indirect branch control mechanisms and their associated hardware are discussed herein: (i) indirect branch restricted speculation (IBRS) to restrict speculation of indirect branches, (ii) single thread indirect branch predictors (STIBP) to prevent indirect branch predictions from being controlled by a sibling thread, and (iii) indirect branch predictor barrier (IBPB) to prevent indirect branch predictions after the barrier from being controlled by software executed before the barrier.

公开(公告)号：US12130740B2

公开(公告)日：2024-10-29

申请号：US17712632

申请日：2022-04-04

Applicant: Intel Corporation

Inventor： Jason W. Brandt ,  Robert S. Chappell ,  Jesus Corbal ,  Edward T. Grochowski ,  Stephen H. Gunther ,  Buford M. Guy ,  Thomas R. Huff ,  Christopher J. Hughes ,  Elmoustapha Ould-Ahmed-Vall ,  Ronak Singhal ,  Seyed Yahya Sotoudeh ,  Bret L. Toll ,  Lihu Rappoport ,  David B. Papworth ,  James D. Allen

IPC: G06F12/0831 ,  G06F9/30 ,  G06F9/38 ,  G06F12/1009 ,  G06F12/1027

CPC classification number: G06F12/0831 ,  G06F9/30043 ,  G06F9/384 ,  G06F12/1009 ,  G06F12/1027 ,  G06F2212/1016 ,  G06F2212/621 ,  G06F2212/68

Abstract: Embodiments of an invention a processor architecture are disclosed. In an embodiment, a processor includes a decoder, an execution unit, a coherent cache, and an interconnect. The decoder is to decode an instruction to zero a cache line. The execution unit is to issue a write command to initiate a cache line sized write of zeros. The coherent cache is to receive the write command, to determine whether there is a hit in the coherent cache and whether a cache coherency protocol state of the hit cache line is a modified state or an exclusive state, to configure a cache line to indicate all zeros, and to issue the write command toward the interconnect. The interconnect is to, responsive to receipt of the write command, issue a snoop to each of a plurality of other coherent caches for which it must be determined if there is a hit.

公开(公告)号：US11675594B2

公开(公告)日：2023-06-13

申请号：US16236049

申请日：2018-12-28

Applicant: Intel Corporation

Inventor： Robert S. Chappell ,  Jason W. Brandt ,  Alan Cox ,  Asit Mallick ,  Joseph Nuzman ,  Arjan Van De Ven

IPC: G06F9/30 ,  G06F9/38 ,  G06F21/55

CPC classification number: G06F9/3842 ,  G06F9/30058 ,  G06F9/30145 ,  G06F21/556 ,  G06F2221/033

Abstract: Embodiments of instructions are detailed herein including one or more of 1) a branch fence instruction, prefix, or variants (BFENCE); 2) a predictor fence instruction, prefix, or variants (PFENCE); 3) an exception fence instruction, prefix, or variants (EFENCE); 4) an address computation fence instruction, prefix, or variants (AFENCE); 5) a register fence instruction, prefix, or variants (RFENCE); and, additionally, modes that apply the above semantics to some or all ordinary instructions.