is a op source 486 processor ip core ,study x86 cpu be refence is

ao486-master
............\LICENSE
............\README.md
............\ao486_tool
............\..........\build.xml
............\..........\manifest.mf
............\..........\nbproject
............\..........\.........\build-impl.xml
............\..........\.........\genfiles.properties
............\..........\.........\private
............\..........\.........\.......\config.properties
............\..........\.........\.......\private.properties
............\..........\.........\.......\private.xml
............\..........\.........\project.properties
............\..........\.........\project.xml
............\..........\run.properties
............\..........\src
............\..........\...\ao486
............\..........\...\.....\AutogenGenerator.java
............\..........\...\.....\Commands.java
............\..........\...\.....\Parse.java
............\..........\...\.....\ParseDecode.java
............\..........\...\.....\ParseDefine.java
............\..........\...\.....\ParseMicrocode.java
............\..........\...\.....\ParseToString.java
............\..........\...\.....\SDGenerator.java
............\..........\...\.....\module
............\..........\...\.....\......\memory
............\..........\...\.....\......\......\AvalonListener.java
............\..........\...\.....\......\......\CheckListener.java
............\..........\...\.....\......\......\GlobalListener.java
............\..........\...\.....\......\......\Input.java
............\..........\...\.....\......\......\InvalidateListener.java
............\..........\...\.....\......\......\Listener.java
............\..........\...\.....\......\......\Output.java
............\..........\...\.....\......\......\PrefetchListener.java
............\..........\...\.....\......\......\ReadListener.java
............\..........\...\.....\......\......\Runner.java
............\..........\...\.....\......\......\Test.java
............\..........\...\.....\......\......\WriteListener.java
............\..........\...\.....\......\......\test
............\..........\...\.....\......\......\....\TestPrefetchCache.java
............\..........\...\.....\......\......\....\TestPrefetchNoCache.java
............\..........\...\.....\......\......\....\TestReadCache.java
............\..........\...\.....\......\......\....\TestReadCacheLRU.java
............\..........\...\.....\......\......\....\TestReadNoCache.java
............\..........\...\.....\......\......\....\TestTLBCheckAccess.java
............\..........\...\.....\......\......\....\TestTLBCode.java
............\..........\...\.....\......\......\....\TestTLBRead.java
............\..........\...\.....\......\......\....\TestTLBReadWriteAccess.java
............\..........\...\.....\......\......\....\TestWriteCache.java
............\..........\...\.....\......\......\....\TestWriteCacheLRU.java
............\..........\...\.....\......\......\....\TestWriteNoCache.java
............\..........\...\.....\......\......\....\TestWriteReadCache.java
............\..........\...\.....\test
............\..........\...\.....\....\RunRaport.java
............\..........\...\.....\....\Runner.java
............\..........\...\.....\....\TestFromTrace.java
............\..........\...\.....\....\TestRandom.java
............\..........\...\.....\....\TestUnit.java
............\..........\...\.....\....\VerilogFreeRun.java
............\..........\...\.....\....\arithmetic_logic
............\..........\...\.....\....\................\TestArithLogic.java
............\..........\...\.....\....\................\TestCMPXCHG.java
............\..........\...\.....\....\................\TestDIV.java
............\..........\...\.....\....\................\TestIDIV.java
............\..........\...\.....\....\................\TestIDIV_minint.java
............\..........\...\.....\....\................\TestIMUL.java
............\..........\...\.....\....\................\TestINC_DEC.java
............\..........\...\.....\....\................\TestMUL.java
............\..........\...\.....\....\................\TestNEG.java
............\.

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