784 bool os::is_allocatable(size_t bytes) {
785 #ifdef AMD64
786 // unused on amd64?
787 return true;
788 #else
789
790 if (bytes < 2 * G) {
791 return true;
792 }
793
794 char* addr = reserve_memory(bytes, NULL);
795
796 if (addr != NULL) {
797 release_memory(addr, bytes);
798 }
799
800 return addr != NULL;
801 #endif // AMD64
802 }
803
804 ////////////////////////////////////////////////////////////////////////////////
805 // thread stack
806
807 // Minimum usable stack sizes required to get to user code. Space for
808 // HotSpot guard pages is added later.
809 size_t os::Posix::_compiler_thread_min_stack_allowed = 48 * K;
810 size_t os::Posix::_java_thread_min_stack_allowed = 48 * K;
811 #ifdef _LP64
812 size_t os::Posix::_vm_internal_thread_min_stack_allowed = 64 * K;
813 #else
814 size_t os::Posix::_vm_internal_thread_min_stack_allowed = (48 DEBUG_ONLY(+ 4)) * K;
815 #endif // _LP64
816
817 #ifndef AMD64
818 #ifdef __GNUC__
819 #define GET_GS() ({int gs; __asm__ volatile("movw %%gs, %w0":"=q"(gs)); gs&0xffff;})
820 #endif
821 #endif // AMD64
822
823 // return default stack size for thr_type
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784 bool os::is_allocatable(size_t bytes) {
785 #ifdef AMD64
786 // unused on amd64?
787 return true;
788 #else
789
790 if (bytes < 2 * G) {
791 return true;
792 }
793
794 char* addr = reserve_memory(bytes, NULL);
795
796 if (addr != NULL) {
797 release_memory(addr, bytes);
798 }
799
800 return addr != NULL;
801 #endif // AMD64
802 }
803
804 juint os::cpu_microcode_revision() {
805 juint result = 0;
806 char data[8];
807 size_t sz = sizeof(data);
808 int ret = sysctlbyname("machdep.cpu.microcode_version", data, &sz, NULL, 0);
809 if (ret == 0) {
810 if (sz == 4) result = *((juint*)data);
811 if (sz == 8) result = *((juint*)data + 1); // upper 32-bits
812 }
813 return result;
814 }
815
816 ////////////////////////////////////////////////////////////////////////////////
817 // thread stack
818
819 // Minimum usable stack sizes required to get to user code. Space for
820 // HotSpot guard pages is added later.
821 size_t os::Posix::_compiler_thread_min_stack_allowed = 48 * K;
822 size_t os::Posix::_java_thread_min_stack_allowed = 48 * K;
823 #ifdef _LP64
824 size_t os::Posix::_vm_internal_thread_min_stack_allowed = 64 * K;
825 #else
826 size_t os::Posix::_vm_internal_thread_min_stack_allowed = (48 DEBUG_ONLY(+ 4)) * K;
827 #endif // _LP64
828
829 #ifndef AMD64
830 #ifdef __GNUC__
831 #define GET_GS() ({int gs; __asm__ volatile("movw %%gs, %w0":"=q"(gs)); gs&0xffff;})
832 #endif
833 #endif // AMD64
834
835 // return default stack size for thr_type
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