src/hotspot/cpu/aarch64/vm_version_aarch64.hpp

8248238: Adding Windows support to OpenJDK on AArch64

Summary: Adding Windows support for AArch64

Contributed-by: Ludovic Henry <luhenry@microsoft.com>, Monica Beckwith <monica.beckwith@microsoft.com>
Reviewed-by:

*** 27,36 ****
--- 27,37 ----
  #define CPU_AARCH64_VM_VERSION_AARCH64_HPP
  
  #include "runtime/abstract_vm_version.hpp"
  #include "runtime/globals_extension.hpp"
  #include "utilities/sizes.hpp"
+ #include "runtime/java.hpp"
  
  class VM_Version : public Abstract_VM_Version {
    friend class JVMCIVMStructs;
  
  protected:
*** 41,51 ****
--- 42,57 ----
    static int _revision;
    static int _stepping;
    static bool _dcpop;
    struct PsrInfo {
      uint32_t dczid_el0;
+ #ifndef _WIN64
+     // On Windows-aarch64, this register is not accessible. We then need to
+     // access the cache line size in a different way. Instead, we get the cache
+     // line size in os::win32::get_cacheline_size.
      uint32_t ctr_el0;
+ #endif
    };
    static PsrInfo _psr_info;
    static void get_processor_features();
  
  public:
*** 104,115 ****
--- 110,124 ----
    static int cpu_model()                      { return _model; }
    static int cpu_model2()                     { return _model2; }
    static int cpu_variant()                    { return _variant; }
    static int cpu_revision()                   { return _revision; }
    static bool supports_dcpop()                { return _dcpop; }
+ 
    static ByteSize dczid_el0_offset() { return byte_offset_of(PsrInfo, dczid_el0); }
+ #ifndef _WIN64
    static ByteSize ctr_el0_offset()   { return byte_offset_of(PsrInfo, ctr_el0); }
+ #endif
    static bool is_zva_enabled() {
      // Check the DZP bit (bit 4) of dczid_el0 is zero
      // and block size (bit 0~3) is not zero.
      return ((_psr_info.dczid_el0 & 0x10) == 0 &&
              (_psr_info.dczid_el0 & 0xf) != 0);
*** 117,130 ****
--- 126,147 ----
    static int zva_length() {
      assert(is_zva_enabled(), "ZVA not available");
      return 4 << (_psr_info.dczid_el0 & 0xf);
    }
    static int icache_line_size() {
+ #ifndef _WIN64
      return (1 << (_psr_info.ctr_el0 & 0x0f)) * 4;
+ #else
+     return os::win32::get_cacheline_size();
+ #endif
    }
    static int dcache_line_size() {
+ #ifndef _WIN64
      return (1 << ((_psr_info.ctr_el0 >> 16) & 0x0f)) * 4;
+ #else
+     return os::win32::get_cacheline_size();
+ #endif
    }
    static bool supports_fast_class_init_checks() { return true; }
  };
  
  #endif // CPU_AARCH64_VM_VERSION_AARCH64_HPP