< prev index next > src/hotspot/cpu/ppc/vm_version_ppc.cpp
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#if defined(_AIX)
#include "os_aix.hpp"
#include <libperfstat.h>
#endif
- #if defined(LINUX) && defined(VM_LITTLE_ENDIAN)
- #include <sys/auxv.h>
-
- #ifndef PPC_FEATURE2_HTM_NOSC
- #define PPC_FEATURE2_HTM_NOSC (1 << 24)
- #endif
- #endif
-
bool VM_Version::_is_determine_features_test_running = false;
uint64_t VM_Version::_dscr_val = 0;
#define MSG(flag) \
if (flag && !FLAG_IS_DEFAULT(flag)) \
#endif
// Create and print feature-string.
char buf[(num_features+1) * 16]; // Max 16 chars per feature.
jio_snprintf(buf, sizeof(buf),
- "ppc64%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s",
+ "ppc64%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s",
(has_fsqrt() ? " fsqrt" : ""),
(has_isel() ? " isel" : ""),
(has_lxarxeh() ? " lxarxeh" : ""),
(has_cmpb() ? " cmpb" : ""),
(has_popcntb() ? " popcntb" : ""),
(has_mfdscr() ? " mfdscr" : ""),
(has_vsx() ? " vsx" : ""),
(has_ldbrx() ? " ldbrx" : ""),
(has_stdbrx() ? " stdbrx" : ""),
(has_vshasig() ? " sha" : ""),
- (has_tm() ? " rtm" : ""),
(has_darn() ? " darn" : ""),
(has_brw() ? " brw" : "")
// Make sure number of %s matches num_features!
);
_features_string = os::strdup(buf);
if (UseVectorizedMismatchIntrinsic) {
warning("UseVectorizedMismatchIntrinsic specified, but not available on this CPU.");
FLAG_SET_DEFAULT(UseVectorizedMismatchIntrinsic, false);
}
-
- // Adjust RTM (Restricted Transactional Memory) flags.
- if (UseRTMLocking) {
- // If CPU or OS do not support RTM:
- if (PowerArchitecturePPC64 < 8 || PowerArchitecturePPC64 > 9) {
- vm_exit_during_initialization("RTM instructions are not available on this CPU.");
- }
-
- if (!has_tm()) {
- vm_exit_during_initialization("RTM is not supported on this OS version.");
- }
-
- #if INCLUDE_RTM_OPT
- if (!FLAG_IS_CMDLINE(UseRTMLocking)) {
- // RTM locking should be used only for applications with
- // high lock contention. For now we do not use it by default.
- vm_exit_during_initialization("UseRTMLocking flag should be only set on command line");
- }
- if (LockingMode != LM_LEGACY) {
- warning("UseRTMLocking requires LockingMode = 1");
- FLAG_SET_DEFAULT(UseRTMLocking, false);
- }
- #else
- // Only C2 does RTM locking optimization.
- vm_exit_during_initialization("RTM locking optimization is not supported in this VM");
- #endif
- } else { // !UseRTMLocking
- if (UseRTMForStackLocks) {
- if (!FLAG_IS_DEFAULT(UseRTMForStackLocks)) {
- warning("UseRTMForStackLocks flag should be off when UseRTMLocking flag is off");
- }
- FLAG_SET_DEFAULT(UseRTMForStackLocks, false);
- }
- if (UseRTMDeopt) {
- FLAG_SET_DEFAULT(UseRTMDeopt, false);
- }
- #ifdef COMPILER2
- if (PrintPreciseRTMLockingStatistics) {
- FLAG_SET_DEFAULT(PrintPreciseRTMLockingStatistics, false);
- }
- #endif
- }
-
// This machine allows unaligned memory accesses
if (FLAG_IS_DEFAULT(UseUnalignedAccesses)) {
FLAG_SET_DEFAULT(UseUnalignedAccesses, true);
}
a->mfdscr(R0); // code[12] -> mfdscr
a->lxvd2x(VSR0, R3_ARG1); // code[13] -> vsx
a->ldbrx(R7, R3_ARG1, R4_ARG2); // code[14] -> ldbrx
a->stdbrx(R7, R3_ARG1, R4_ARG2); // code[15] -> stdbrx
a->vshasigmaw(VR0, VR1, 1, 0xF); // code[16] -> vshasig
- // rtm is determined by OS
a->darn(R7); // code[17] -> darn
a->brw(R5, R6); // code[18] -> brw
a->blr();
// Emit function to set one cache line to zero. Emit function descriptor and get pointer to it.
if (code[feature_cntr++]) features |= mfdscr_m;
if (code[feature_cntr++]) features |= vsx_m;
if (code[feature_cntr++]) features |= ldbrx_m;
if (code[feature_cntr++]) features |= stdbrx_m;
if (code[feature_cntr++]) features |= vshasig_m;
- // feature rtm_m is determined by OS
if (code[feature_cntr++]) features |= darn_m;
if (code[feature_cntr++]) features |= brw_m;
// Print the detection code.
if (PrintAssembly) {
tty->print_cr("Decoding cpu-feature detection stub at " INTPTR_FORMAT " after execution:", p2i(code));
Disassembler::decode((u_char*)code, (u_char*)code_end, tty);
}
_features = features;
-
- #ifdef AIX
- // To enable it on AIX it's necessary POWER8 or above and at least AIX 7.2.
- // Actually, this is supported since AIX 7.1.. Unfortunately, this first
- // contained bugs, so that it can only be enabled after AIX 7.1.3.30.
- // The Java property os.version, which is used in RTM tests to decide
- // whether the feature is available, only knows major and minor versions.
- // We don't want to change this property, as user code might depend on it.
- // So the tests can not check on subversion 3.30, and we only enable RTM
- // with AIX 7.2.
- if (has_lqarx() && !has_brw()) { // POWER8 or POWER9
- if (os::Aix::os_version() >= 0x07020000) { // At least AIX 7.2.
- _features |= rtm_m;
- }
- }
- #endif
- #if defined(LINUX) && defined(VM_LITTLE_ENDIAN)
- unsigned long auxv = getauxval(AT_HWCAP2);
-
- if (auxv & PPC_FEATURE2_HTM_NOSC) {
- if (auxv & PPC_FEATURE2_HAS_HTM) {
- // TM on POWER8 and POWER9 in compat mode (VM) is supported by the JVM.
- // TM on POWER9 DD2.1 NV (baremetal) is not supported by the JVM (TM on
- // POWER9 DD2.1 NV has a few issues that need a couple of firmware
- // and kernel workarounds, so there is a new mode only supported
- // on non-virtualized P9 machines called HTM with no Suspend Mode).
- // TM on POWER9 D2.2+ NV is not supported at all by Linux.
- _features |= rtm_m;
- }
- }
- #endif
}
// Power 8: Configure Data Stream Control Register.
void VM_Version::config_dscr() {
// 7 InstWords for each call (function descriptor + blr instruction).
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