svm: sync with AARCH64.CPUFeature in JDK 19

Author: oraluben

substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/aarch64/AArch64LibCHelper.java

@@ -123,6 +123,14 @@ public interface CPUFeatures extends PointerBase {
         @AllowNarrowingCast
         @CField
         boolean fDMB_ATOMICS();
+
+        @AllowNarrowingCast
+        @CField
+        boolean fPACA();
+
+        @AllowNarrowingCast
+        @CField
+        boolean fSVEBITPERM();
     }
     // Checkstyle: resume
 }

substratevm/src/com.oracle.svm.native.libchelper/include/aarch64cpufeatures.h

@@ -42,4 +42,6 @@ typedef struct {
   char fSTXR_PREFETCH;
   char fA53MAC;
   char fDMB_ATOMICS;
+  char fPACA;
+  char fSVEBITPERM;
 } CPUFeatures;

substratevm/src/com.oracle.svm.native.libchelper/src/cpuid.c

@@ -623,6 +623,8 @@ void determineCPUFeatures(CPUFeatures* features) {
   features->fSTXR_PREFETCH = 0;
   features->fA53MAC = 0;
   features->fDMB_ATOMICS = 0;
+  features->fPACA = 0;
+  features->fSVEBITPERM = 0;
 }
 
 /*
@@ -674,9 +676,15 @@ void determineCPUFeatures(CPUFeatures* features) {
 #ifndef HWCAP_SVE
 #define HWCAP_SVE           (1L << 22)
 #endif
+#ifndef HWCAP_PACA
+#define HWCAP_PACA          (1L << 30)
+#endif
 #ifndef HWCAP2_SVE2
 #define HWCAP2_SVE2         (1L << 1)
 #endif
+#ifndef HWCAP2_SVEBITPERM
+#define HWCAP2_SVEBITPERM   (1L << 4)
+#endif
 
 #define CPU_ARM 'A'
 #define CPU_CAVIUM 'C'
@@ -706,6 +714,8 @@ void determineCPUFeatures(CPUFeatures* features) {
   features->fSTXR_PREFETCH = 0;
   features->fA53MAC = 0;
   features->fDMB_ATOMICS = 0;
+  features->fPACA = !!(auxv & HWCAP_PACA);
+  features->fSVEBITPERM = !!(auxv2 & HWCAP2_SVEBITPERM);
 
   //checking for features signaled in another way