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  1. JDK
  2. JDK-8222753

AArch64: Add CPU implementer code for Ampere

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    Details

    • Type: Enhancement
    • Status: Resolved
    • Priority: P4
    • Resolution: Fixed
    • Affects Version/s: 13
    • Fix Version/s: 13
    • Component/s: hotspot
    • Labels:
      None
    • Subcomponent:
    • Resolved In Build:
      b18
    • CPU:
      aarch64

      Description

      The original discussion started at:
      https://mail.openjdk.java.net/pipermail/aarch64-port-dev/2019-April/007245.html

      According to the latest document of Arm DDI0487, which is ARM Architecture Reference Manual ARMv8, for ARMv8-A architecture profile at https://developer.arm.com/docs/ddi0487/latest, the new CPU implementer code CPU_AMPERE (0xC0) is going to be added into the "enum Family" defined in hotspot/cpu/aarch64/vm_version_aarch64.hpp.

      The reason why ISO8859-1 (ASCII) representation is not used for this entry specially is: 0xC0 belongs to the list of "The extended ASCII codes" (https://www.ascii-code.com/) which would not display correctly in multiple terminals and caused build warnings "multichar". -Wno-multichar option in makefiles can suppress warnings but will not be used here since real typos in code could be missed if disabling the check.

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            Assignee:
            qpzhang Patrick Zhang
            Reporter:
            qpzhang Patrick Zhang
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              Created:
              Updated:
              Resolved: