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8371651: [AArch64] Populate CPU _features flag on Windows

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Reviewed-by: dholmes, bstafford, aph
This commit is contained in:
Dhamoder Nalla 2026-04-01 01:42:33 +00:00 committed by David Holmes
parent c76381996a
commit 52fd46d3a6
2 changed files with 70 additions and 7 deletions
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42
src/hotspot/os_cpu/windows_aarch64/sve_windows_aarch64.S Normal file
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@ -0,0 +1,42 @@
;
; Copyright (c) 2026, Oracle and/or its affiliates. All rights reserved.
; DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
;
; This code is free software; you can redistribute it and/or modify it
; under the terms of the GNU General Public License version 2 only, as
; published by the Free Software Foundation.
;
; This code is distributed in the hope that it will be useful, but WITHOUT
; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
; version 2 for more details (a copy is included in the LICENSE file that
; accompanied this code).
;
; You should have received a copy of the GNU General Public License version
; 2 along with this work; if not, write to the Free Software Foundation,
; Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
;
; Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
; or visit www.oracle.com if you need additional information or have any
; questions.
;
; Support for int get_sve_vector_length();
;
; Returns the current SVE vector length in bytes.
; This function uses the INCB instruction which increments a register
; by the number of bytes in an SVE vector register.
;
; Note: This function will fault if SVE is not available or enabled.
; The caller must ensure SVE support is detected before calling.
ALIGN 4
EXPORT get_sve_vector_length
AREA sve_text, CODE
get_sve_vector_length
mov x0, #0
incb x0
ret
END

35
src/hotspot/os_cpu/windows_aarch64/vm_version_windows_aarch64.cpp
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@ -26,16 +26,19 @@
#include "runtime/os.hpp"
#include "runtime/vm_version.hpp"
// Assembly function to get SVE vector length using INCB instruction
extern "C" int get_sve_vector_length();
int VM_Version::get_current_sve_vector_length() {
assert(VM_Version::supports_sve(), "should not call this");
ShouldNotReachHere();
return 0;
// Use assembly instruction to get the actual SVE vector length
return VM_Version::supports_sve() ? get_sve_vector_length() : 0; // This value is in bytes
}
int VM_Version::set_and_get_current_sve_vector_length(int length) {
assert(VM_Version::supports_sve(), "should not call this");
ShouldNotReachHere();
return 0;
// Use assembly instruction to get the SVE vector length
return VM_Version::supports_sve() ? get_sve_vector_length() : 0; // This value is in bytes
}
void VM_Version::get_os_cpu_info() {
@ -47,11 +50,29 @@ void VM_Version::get_os_cpu_info() {
set_feature(CPU_AES);
set_feature(CPU_SHA1);
set_feature(CPU_SHA2);
set_feature(CPU_PMULL);
}
if (IsProcessorFeaturePresent(PF_ARM_VFP_32_REGISTERS_AVAILABLE)) {
set_feature(CPU_ASIMD);
}
// No check for CPU_PMULL, CPU_SVE, CPU_SVE2
if (IsProcessorFeaturePresent(PF_ARM_V81_ATOMIC_INSTRUCTIONS_AVAILABLE)) {
set_feature(CPU_LSE);
}
if (IsProcessorFeaturePresent(PF_ARM_SVE_INSTRUCTIONS_AVAILABLE)) {
set_feature(CPU_SVE);
}
if (IsProcessorFeaturePresent(PF_ARM_SVE2_INSTRUCTIONS_AVAILABLE)) {
set_feature(CPU_SVE2);
}
if (IsProcessorFeaturePresent(PF_ARM_SVE_BITPERM_INSTRUCTIONS_AVAILABLE)) {
set_feature(CPU_SVEBITPERM);
}
if (IsProcessorFeaturePresent(PF_ARM_SHA3_INSTRUCTIONS_AVAILABLE)) {
set_feature(CPU_SHA3);
}
if (IsProcessorFeaturePresent(PF_ARM_SHA512_INSTRUCTIONS_AVAILABLE)) {
set_feature(CPU_SHA512);
}
__int64 dczid_el0 = _ReadStatusReg(0x5807 /* ARM64_DCZID_EL0 */);
@ -102,8 +123,8 @@ void VM_Version::get_os_cpu_info() {
SYSTEM_INFO si;
GetSystemInfo(&si);
_model = si.wProcessorLevel;
_variant = si.wProcessorRevision / 0xFF;
_revision = si.wProcessorRevision & 0xFF;
_variant = (si.wProcessorRevision >> 8) & 0xFF; // Variant is the upper byte of wProcessorRevision
_revision = si.wProcessorRevision & 0xFF; // Revision is the lower byte of wProcessorRevision
}
}
}