зеркало из https://github.com/mozilla/pjs.git
214 строки
5.7 KiB
C++
214 строки
5.7 KiB
C++
/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is arm.cpp
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*
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* The Initial Developer of the Original Code is the Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2011
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Timothy B. Terriberry <tterriberry@mozilla.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/* compile-time and runtime tests for whether to use various ARM extensions */
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#include "arm.h"
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#if defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
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namespace {
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// arm.h has parallel #ifs which declare MOZILLA_ARM_HAVE_CPUID_DETECTION.
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// We don't check it here so that we get compile errors if it's defined, but
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// we don't compile one of these detection methods. The detection code here is
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// based on the CPU detection in libtheora.
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# if defined(_MSC_VER)
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//For GetExceptionCode() and EXCEPTION_ILLEGAL_INSTRUCTION.
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# define WIN32_LEAN_AND_MEAN
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# define WIN32_EXTRA_LEAN
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# include <windows.h>
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# if !defined(MOZILLA_PRESUME_EDSP)
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static bool
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check_edsp(void)
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{
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# if defined(MOZILLA_MAY_SUPPORT_EDSP)
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__try
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{
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//PLD [r13]
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__emit(0xF5DDF000);
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return true;
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}
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__except(GetExceptionCode()==EXCEPTION_ILLEGAL_INSTRUCTION)
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{
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//Ignore exception.
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}
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# endif
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return false;
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}
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# endif // !MOZILLA_PRESUME_EDSP
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# if !defined(MOZILLA_PRESUME_ARMV6)
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static bool
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check_armv6(void)
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{
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# if defined(MOZILLA_MAY_SUPPORT_ARMV6)
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__try
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{
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//SHADD8 r3,r3,r3
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__emit(0xE6333F93);
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return true;
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}
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__except(GetExceptionCode()==EXCEPTION_ILLEGAL_INSTRUCTION)
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{
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//Ignore exception.
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}
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# endif
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return false;
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}
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# endif // !MOZILLA_PRESUME_ARMV6
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# if !defined(MOZILLA_PRESUME_NEON)
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static bool
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check_neon(void)
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{
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# if defined(MOZILLA_MAY_SUPPORT_NEON)
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__try
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{
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//VORR q0,q0,q0
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__emit(0xF2200150);
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return true;
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}
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__except(GetExceptionCode()==EXCEPTION_ILLEGAL_INSTRUCTION)
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{
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//Ignore exception.
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}
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# endif
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return false;
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}
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# endif // !MOZILLA_PRESUME_NEON
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# elif defined(__linux__) || defined(ANDROID)
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# include <stdio.h>
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# include <stdlib.h>
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# include <string.h>
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enum{
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MOZILLA_HAS_EDSP_FLAG=1,
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MOZILLA_HAS_ARMV6_FLAG=2,
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MOZILLA_HAS_NEON_FLAG=4
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};
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static unsigned
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get_arm_cpu_flags(void)
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{
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unsigned flags;
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FILE *fin;
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flags = 0;
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/*Reading /proc/self/auxv would be easier, but that doesn't work reliably on
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Android. This also means that detection will fail in Scratchbox, which is
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desirable, as NEON does not work in the qemu shipped with the Maemo 5 SDK.
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I don't know if /proc/self/auxv would do any better in that case, anyway,
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or if it would return random flags from the host CPU.*/
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fin = fopen ("/proc/cpuinfo","r");
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if (fin != NULL)
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{
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/*512 should be enough for anybody (it's even enough for all the flags that
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x86 has accumulated... so far).*/
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char buf[512];
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while (fgets(buf, 511, fin) != NULL)
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{
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if (memcmp(buf, "Features", 8) == 0)
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{
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char *p;
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p = strstr(buf, " edsp");
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if (p != NULL && (p[5] == ' ' || p[5] == '\n'))
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flags |= MOZILLA_HAS_EDSP_FLAG;
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p = strstr(buf, " neon");
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if( p != NULL && (p[5] == ' ' || p[5] == '\n'))
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flags |= MOZILLA_HAS_NEON_FLAG;
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}
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if (memcmp(buf, "CPU architecture:", 17) == 0)
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{
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int version;
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version = atoi(buf + 17);
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if (version >= 6)
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flags |= MOZILLA_HAS_ARMV6_FLAG;
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}
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}
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fclose(fin);
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}
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return flags;
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}
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// Cache a local copy so we only have to read /proc/cpuinfo once.
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static unsigned arm_cpu_flags = get_arm_cpu_flags();
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# if !defined(MOZILLA_PRESUME_EDSP)
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static bool
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check_edsp(void)
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{
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return (arm_cpu_flags & MOZILLA_HAS_EDSP_FLAG) != 0;
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}
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# endif
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# if !defined(MOZILLA_PRESUME_ARMV6)
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static bool
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check_armv6(void)
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{
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return (arm_cpu_flags & MOZILLA_HAS_ARMV6_FLAG) != 0;
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}
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# endif
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# if !defined(MOZILLA_PRESUME_NEON)
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static bool
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check_neon(void)
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{
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return (arm_cpu_flags & MOZILLA_HAS_NEON_FLAG) != 0;
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# endif
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}
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# endif // defined(__linux__) || defined(ANDROID)
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}
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namespace mozilla {
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namespace arm_private {
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# if !defined(MOZILLA_PRESUME_EDSP)
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bool edsp_enabled = check_edsp();
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# endif
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# if !defined(MOZILLA_PRESUME_ARMV6)
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bool armv6_enabled = check_armv6();
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# endif
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# if !defined(MOZILLA_PRESUME_NEON)
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bool neon_enabled = check_neon();
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# endif
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} // namespace arm_private
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} // namespace mozilla
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#endif // MOZILLA_ARM_HAVE_CPUID_DETECTION
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