| /* |
| * Copyright (c) 1998, 2007, 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. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * 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. |
| */ |
| |
| #include "ergo.h" |
| |
| static unsigned long physical_processors(void); |
| |
| #ifdef __solaris__ |
| |
| /* |
| * A utility method for asking the CPU about itself. |
| * There's a corresponding version of linux-i586 |
| * because the compilers are different. |
| */ |
| static void |
| get_cpuid(uint32_t arg, |
| uint32_t* eaxp, |
| uint32_t* ebxp, |
| uint32_t* ecxp, |
| uint32_t* edxp) { |
| #ifdef _LP64 |
| asm( |
| /* rbx is a callee-saved register */ |
| " movq %rbx, %r11 \n" |
| /* rdx and rcx are 3rd and 4th argument registers */ |
| " movq %rdx, %r10 \n" |
| " movq %rcx, %r9 \n" |
| " movl %edi, %eax \n" |
| " cpuid \n" |
| " movl %eax, (%rsi)\n" |
| " movl %ebx, (%r10)\n" |
| " movl %ecx, (%r9) \n" |
| " movl %edx, (%r8) \n" |
| /* Restore rbx */ |
| " movq %r11, %rbx"); |
| #else |
| /* EBX is a callee-saved register */ |
| asm(" pushl %ebx"); |
| /* Need ESI for storing through arguments */ |
| asm(" pushl %esi"); |
| asm(" movl 8(%ebp), %eax \n" |
| " cpuid \n" |
| " movl 12(%ebp), %esi \n" |
| " movl %eax, (%esi) \n" |
| " movl 16(%ebp), %esi \n" |
| " movl %ebx, (%esi) \n" |
| " movl 20(%ebp), %esi \n" |
| " movl %ecx, (%esi) \n" |
| " movl 24(%ebp), %esi \n" |
| " movl %edx, (%esi) "); |
| /* Restore ESI and EBX */ |
| asm(" popl %esi"); |
| /* Restore EBX */ |
| asm(" popl %ebx"); |
| #endif /* LP64 */ |
| } |
| |
| /* The definition of a server-class machine for solaris-i586/amd64 */ |
| jboolean |
| ServerClassMachineImpl(void) { |
| jboolean result = JNI_FALSE; |
| /* How big is a server class machine? */ |
| const unsigned long server_processors = 2UL; |
| const uint64_t server_memory = 2UL * GB; |
| /* |
| * We seem not to get our full complement of memory. |
| * We allow some part (1/8?) of the memory to be "missing", |
| * based on the sizes of DIMMs, and maybe graphics cards. |
| */ |
| const uint64_t missing_memory = 256UL * MB; |
| const uint64_t actual_memory = physical_memory(); |
| |
| /* Is this a server class machine? */ |
| if (actual_memory >= (server_memory - missing_memory)) { |
| const unsigned long actual_processors = physical_processors(); |
| if (actual_processors >= server_processors) { |
| result = JNI_TRUE; |
| } |
| } |
| JLI_TraceLauncher("solaris_" LIBARCHNAME "_ServerClassMachine: %s\n", |
| (result == JNI_TRUE ? "true" : "false")); |
| return result; |
| } |
| |
| #endif /* __solaris__ */ |
| |
| #ifdef __linux__ |
| |
| /* |
| * A utility method for asking the CPU about itself. |
| * There's a corresponding version of solaris-i586 |
| * because the compilers are different. |
| */ |
| static void |
| get_cpuid(uint32_t arg, |
| uint32_t* eaxp, |
| uint32_t* ebxp, |
| uint32_t* ecxp, |
| uint32_t* edxp) { |
| #ifdef _LP64 |
| __asm__ volatile (/* Instructions */ |
| " movl %4, %%eax \n" |
| " cpuid \n" |
| " movl %%eax, (%0)\n" |
| " movl %%ebx, (%1)\n" |
| " movl %%ecx, (%2)\n" |
| " movl %%edx, (%3)\n" |
| : /* Outputs */ |
| : /* Inputs */ |
| "r" (eaxp), |
| "r" (ebxp), |
| "r" (ecxp), |
| "r" (edxp), |
| "r" (arg) |
| : /* Clobbers */ |
| "%rax", "%rbx", "%rcx", "%rdx", "memory" |
| ); |
| #else /* _LP64 */ |
| uint32_t value_of_eax = 0; |
| uint32_t value_of_ebx = 0; |
| uint32_t value_of_ecx = 0; |
| uint32_t value_of_edx = 0; |
| __asm__ volatile (/* Instructions */ |
| /* ebx is callee-save, so push it */ |
| " pushl %%ebx \n" |
| " movl %4, %%eax \n" |
| " cpuid \n" |
| " movl %%eax, %0 \n" |
| " movl %%ebx, %1 \n" |
| " movl %%ecx, %2 \n" |
| " movl %%edx, %3 \n" |
| /* restore ebx */ |
| " popl %%ebx \n" |
| |
| : /* Outputs */ |
| "=m" (value_of_eax), |
| "=m" (value_of_ebx), |
| "=m" (value_of_ecx), |
| "=m" (value_of_edx) |
| : /* Inputs */ |
| "m" (arg) |
| : /* Clobbers */ |
| "%eax", "%ecx", "%edx" |
| ); |
| *eaxp = value_of_eax; |
| *ebxp = value_of_ebx; |
| *ecxp = value_of_ecx; |
| *edxp = value_of_edx; |
| #endif /* _LP64 */ |
| } |
| |
| /* The definition of a server-class machine for linux-i586 */ |
| jboolean |
| ServerClassMachineImpl(void) { |
| jboolean result = JNI_FALSE; |
| /* How big is a server class machine? */ |
| const unsigned long server_processors = 2UL; |
| const uint64_t server_memory = 2UL * GB; |
| /* |
| * We seem not to get our full complement of memory. |
| * We allow some part (1/8?) of the memory to be "missing", |
| * based on the sizes of DIMMs, and maybe graphics cards. |
| */ |
| const uint64_t missing_memory = 256UL * MB; |
| const uint64_t actual_memory = physical_memory(); |
| |
| /* Is this a server class machine? */ |
| if (actual_memory >= (server_memory - missing_memory)) { |
| const unsigned long actual_processors = physical_processors(); |
| if (actual_processors >= server_processors) { |
| result = JNI_TRUE; |
| } |
| } |
| JLI_TraceLauncher("linux_" LIBARCHNAME "_ServerClassMachine: %s\n", |
| (result == JNI_TRUE ? "true" : "false")); |
| return result; |
| } |
| #endif /* __linux__ */ |
| |
| /* |
| * Routines shared by solaris-i586 and linux-i586. |
| */ |
| |
| enum HyperThreadingSupport_enum { |
| hts_supported = 1, |
| hts_too_soon_to_tell = 0, |
| hts_not_supported = -1, |
| hts_not_pentium4 = -2, |
| hts_not_intel = -3 |
| }; |
| typedef enum HyperThreadingSupport_enum HyperThreadingSupport; |
| |
| /* Determine if hyperthreading is supported */ |
| static HyperThreadingSupport |
| hyperthreading_support(void) { |
| HyperThreadingSupport result = hts_too_soon_to_tell; |
| /* Bits 11 through 8 is family processor id */ |
| # define FAMILY_ID_SHIFT 8 |
| # define FAMILY_ID_MASK 0xf |
| /* Bits 23 through 20 is extended family processor id */ |
| # define EXT_FAMILY_ID_SHIFT 20 |
| # define EXT_FAMILY_ID_MASK 0xf |
| /* Pentium 4 family processor id */ |
| # define PENTIUM4_FAMILY_ID 0xf |
| /* Bit 28 indicates Hyper-Threading Technology support */ |
| # define HT_BIT_SHIFT 28 |
| # define HT_BIT_MASK 1 |
| uint32_t vendor_id[3] = { 0U, 0U, 0U }; |
| uint32_t value_of_eax = 0U; |
| uint32_t value_of_edx = 0U; |
| uint32_t dummy = 0U; |
| |
| /* Yes, this is supposed to be [0], [2], [1] */ |
| get_cpuid(0, &dummy, &vendor_id[0], &vendor_id[2], &vendor_id[1]); |
| JLI_TraceLauncher("vendor: %c %c %c %c %c %c %c %c %c %c %c %c \n", |
| ((vendor_id[0] >> 0) & 0xff), |
| ((vendor_id[0] >> 8) & 0xff), |
| ((vendor_id[0] >> 16) & 0xff), |
| ((vendor_id[0] >> 24) & 0xff), |
| ((vendor_id[1] >> 0) & 0xff), |
| ((vendor_id[1] >> 8) & 0xff), |
| ((vendor_id[1] >> 16) & 0xff), |
| ((vendor_id[1] >> 24) & 0xff), |
| ((vendor_id[2] >> 0) & 0xff), |
| ((vendor_id[2] >> 8) & 0xff), |
| ((vendor_id[2] >> 16) & 0xff), |
| ((vendor_id[2] >> 24) & 0xff)); |
| get_cpuid(1, &value_of_eax, &dummy, &dummy, &value_of_edx); |
| JLI_TraceLauncher("value_of_eax: 0x%x value_of_edx: 0x%x\n", |
| value_of_eax, value_of_edx); |
| if ((((value_of_eax >> FAMILY_ID_SHIFT) & FAMILY_ID_MASK) == PENTIUM4_FAMILY_ID) || |
| (((value_of_eax >> EXT_FAMILY_ID_SHIFT) & EXT_FAMILY_ID_MASK) != 0)) { |
| if ((((vendor_id[0] >> 0) & 0xff) == 'G') && |
| (((vendor_id[0] >> 8) & 0xff) == 'e') && |
| (((vendor_id[0] >> 16) & 0xff) == 'n') && |
| (((vendor_id[0] >> 24) & 0xff) == 'u') && |
| (((vendor_id[1] >> 0) & 0xff) == 'i') && |
| (((vendor_id[1] >> 8) & 0xff) == 'n') && |
| (((vendor_id[1] >> 16) & 0xff) == 'e') && |
| (((vendor_id[1] >> 24) & 0xff) == 'I') && |
| (((vendor_id[2] >> 0) & 0xff) == 'n') && |
| (((vendor_id[2] >> 8) & 0xff) == 't') && |
| (((vendor_id[2] >> 16) & 0xff) == 'e') && |
| (((vendor_id[2] >> 24) & 0xff) == 'l')) { |
| if (((value_of_edx >> HT_BIT_SHIFT) & HT_BIT_MASK) == HT_BIT_MASK) { |
| JLI_TraceLauncher("Hyperthreading supported\n"); |
| result = hts_supported; |
| } else { |
| JLI_TraceLauncher("Hyperthreading not supported\n"); |
| result = hts_not_supported; |
| } |
| } else { |
| JLI_TraceLauncher("Not GenuineIntel\n"); |
| result = hts_not_intel; |
| } |
| } else { |
| JLI_TraceLauncher("not Pentium 4 or extended\n"); |
| result = hts_not_pentium4; |
| } |
| return result; |
| } |
| |
| /* Determine how many logical processors there are per CPU */ |
| static unsigned int |
| logical_processors_per_package(void) { |
| /* |
| * After CPUID with EAX==1, register EBX bits 23 through 16 |
| * indicate the number of logical processors per package |
| */ |
| # define NUM_LOGICAL_SHIFT 16 |
| # define NUM_LOGICAL_MASK 0xff |
| unsigned int result = 1U; |
| const HyperThreadingSupport hyperthreading = hyperthreading_support(); |
| |
| if (hyperthreading == hts_supported) { |
| uint32_t value_of_ebx = 0U; |
| uint32_t dummy = 0U; |
| |
| get_cpuid(1, &dummy, &value_of_ebx, &dummy, &dummy); |
| result = (value_of_ebx >> NUM_LOGICAL_SHIFT) & NUM_LOGICAL_MASK; |
| JLI_TraceLauncher("logical processors per package: %u\n", result); |
| } |
| return result; |
| } |
| |
| /* Compute the number of physical processors, not logical processors */ |
| static unsigned long |
| physical_processors(void) { |
| const long sys_processors = sysconf(_SC_NPROCESSORS_CONF); |
| unsigned long result = sys_processors; |
| |
| JLI_TraceLauncher("sysconf(_SC_NPROCESSORS_CONF): %lu\n", sys_processors); |
| if (sys_processors > 1) { |
| unsigned int logical_processors = logical_processors_per_package(); |
| if (logical_processors > 1) { |
| result = (unsigned long) sys_processors / logical_processors; |
| } |
| } |
| JLI_TraceLauncher("physical processors: %lu\n", result); |
| return result; |
| } |
