603 }
604
605 // Check that the linux kernel version is 2.4 or higher since earlier
606 // versions do not support SSE without patches.
607 bool os::supports_sse() {
608 #ifdef AMD64
609 return true;
610 #else
611 struct utsname uts;
612 if( uname(&uts) != 0 ) return false; // uname fails?
613 char *minor_string;
614 int major = strtol(uts.release,&minor_string,10);
615 int minor = strtol(minor_string+1,NULL,10);
616 bool result = (major > 2 || (major==2 && minor >= 4));
617 log_info(os)("OS version is %d.%d, which %s support SSE/SSE2",
618 major,minor, result ? "DOES" : "does NOT");
619 return result;
620 #endif // AMD64
621 }
622
623 bool os::is_allocatable(size_t bytes) {
624 #ifdef AMD64
625 // unused on amd64?
626 return true;
627 #else
628
629 if (bytes < 2 * G) {
630 return true;
631 }
632
633 char* addr = reserve_memory(bytes, NULL);
634
635 if (addr != NULL) {
636 release_memory(addr, bytes);
637 }
638
639 return addr != NULL;
640 #endif // AMD64
641 }
642
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603 }
604
605 // Check that the linux kernel version is 2.4 or higher since earlier
606 // versions do not support SSE without patches.
607 bool os::supports_sse() {
608 #ifdef AMD64
609 return true;
610 #else
611 struct utsname uts;
612 if( uname(&uts) != 0 ) return false; // uname fails?
613 char *minor_string;
614 int major = strtol(uts.release,&minor_string,10);
615 int minor = strtol(minor_string+1,NULL,10);
616 bool result = (major > 2 || (major==2 && minor >= 4));
617 log_info(os)("OS version is %d.%d, which %s support SSE/SSE2",
618 major,minor, result ? "DOES" : "does NOT");
619 return result;
620 #endif // AMD64
621 }
622
623 juint os::cpu_microcode_revision() {
624 juint result = 0;
625 char * line = NULL;
626 size_t len = 0;
627 ssize_t read;
628 FILE *fp = fopen("/proc/cpuinfo", "r");
629 if (fp) {
630 while ((read = getline(&line, &len, fp)) != -1) {
631 if (len > 10 && strstr(line, "microcode") != NULL) {
632 char* rev = strchr(line, ':');
633 if (rev != NULL) sscanf(rev + 1, "%x", &result);
634 break;
635 }
636 }
637 free(line);
638 fclose(fp);
639 }
640 return result;
641 }
642
643 bool os::is_allocatable(size_t bytes) {
644 #ifdef AMD64
645 // unused on amd64?
646 return true;
647 #else
648
649 if (bytes < 2 * G) {
650 return true;
651 }
652
653 char* addr = reserve_memory(bytes, NULL);
654
655 if (addr != NULL) {
656 release_memory(addr, bytes);
657 }
658
659 return addr != NULL;
660 #endif // AMD64
661 }
662
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