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TODO-list:
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CPU common:
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- Unimplemented features/bugs:
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 - Delay slot handling may fail sometimes (branch end of page, delay
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 slot next page)
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 - Atomical instructions
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 - CPU features should match real CPUs (also ASI selection)
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- Optimizations/improvements:
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 - Condition code/branch handling like x86, also for FPU?
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 - Remove remaining explicit alignment checks
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 - Global register for regwptr, so that windowed registers can be
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 accessed directly
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 - Improve Sparc32plus addressing
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 - NPC/PC static optimisations (use JUMP_TB when possible)? (Is this
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 obsolete?)
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 - Synthetic instructions
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 - MMU model dependant on CPU model
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 - Select ASI helper at translation time (on V9 only if known)
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 - KQemu/KVM support for VM only
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 - Hardware breakpoint/watchpoint support
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 - Cache emulation mode
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 - Reverse-endian pages
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 - Faster FPU emulation
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 - Busy loop detection
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Sparc32 CPUs:
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- Unimplemented features/bugs:
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 - Sun4/Sun4c MMUs
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 - Some V8 ASIs
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Sparc64 CPUs:
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- Unimplemented features/bugs:
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 - Interrupt handling
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 - Secondary address space, other MMU functions
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 - Many V9/UA2005/UA2007 ASIs
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 - Rest of V9 instructions, missing VIS instructions
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 - IG/MG/AG vs. UA2007 globals
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 - Full hypervisor support
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 - SMP/CMT
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 - Sun4v CPUs
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- Optimizations/improvements:
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 - Use TCG logic ops for VIS when possible
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Sun4:
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- To be added
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Sun4c:
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- A lot of unimplemented features
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- Maybe split from Sun4m
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Sun4m:
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- Unimplemented features/bugs:
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 - Hardware devices do not match real boards
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 - Floppy does not work
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 - Missing keys, sendkey support for all keys
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 - CS4231 (DMA, make sound, make available for PC)
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 - Add cg6, bwtwo
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 - Arbitrary resolution support
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 - PCI for MicroSparc-IIe
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 - JavaStation machines
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 - SBus slot probing, FCode ROM support
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 - SMP probing support
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 - Interrupt routing does not match real HW
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 - SuSE 7.3 keyboard sometimes unresponsive
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 - Gentoo 2004.1 SMP does not work
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 - SS600MP ledma -> lebuffer
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 - Type 5 keyboard
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 - Less fixed hardware choices
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 - DBRI audio (Am7930)
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 - BPP parallel
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 - Diagnostic switch
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 - ESP PIO mode
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Sun4d:
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- A lot of unimplemented features:
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 - SBI
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 - IO-unit
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- Maybe split from Sun4m
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Sun4u:
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- Unimplemented features/bugs:
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 - Interrupt controller
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 - PCI/IOMMU support (Simba, JIO, Tomatillo, Psycho, Schizo, Safari...)
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 - SMP
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 - Happy Meal Ethernet, flash, I2C, GPIO
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 - A lot of real machine types
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Sun4v:
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- To be added