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target-ppc: Fix narrow-mode add/sub carry output
[mirror_qemu.git] / target-mips / TODO
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1Unsolved issues/bugs in the mips/mipsel backend
2-----------------------------------------------
3
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4General
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d0f48074 6- Unimplemented ASEs:
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7 - MDMX
8 - SmartMIPS
b30706dd 9 - microMIPS DSP r1 & r2 encodings
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10- MT ASE only partially implemented and not functional
11- Shadow register support only partially implemented,
12 lacks set switching on interrupt/exception.
13- 34K ITC not implemented.
14- A general lack of documentation, especially for technical internals.
15 Existing documentation is x86-centric.
16- Reverse endianness bit not implemented
17- The TLB emulation is very inefficient:
6576b74b 18 QEMU's softmmu implements a x86-style MMU, with separate entries
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19 for read/write/execute, a TLB index which is just a modulo of the
20 virtual address, and a set of TLBs for each user/kernel/supervisor
21 MMU mode.
22 MIPS has a single entry for read/write/execute and only one MMU mode.
23 But it is fully associative with randomized entry indices, and uses
24 up to 256 ASID tags as additional matching criterion (which roughly
25 equates to 256 MMU modes). It also has a global flag which causes
26 entries to match regardless of ASID.
6576b74b 27 To cope with these differences, QEMU currently flushes the TLB at
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28 each ASID change. Using the MMU modes to implement ASIDs hinges on
29 implementing the global bit efficiently.
bec19c09 30- save/restore of the CPU state is not implemented (see machine.c).
2c52c816 31
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32MIPS64
33------
540635ba 34- Userland emulation (both n32 and n64) not functional.
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35
36"Generic" 4Kc system emulation
37------------------------------
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38- Doesn't correspond to any real hardware. Should be removed some day,
39 U-Boot is the last remaining user.
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41PICA 61 system emulation
42------------------------
43- No framebuffer support yet.
44
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45MALTA system emulation
46----------------------
2c52c816 47- We fake firmware support instead of doing the real thing
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48- Real firmware (YAMON) falls over when trying to init RAM, presumably
49 due to lacking system controller emulation.
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50- Bonito system controller not implemented
51- MSC1 system controller not implemented