Semiconductor & Computer Engineering
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Coprocessor 0 - MIPS
Coprocessor 0 (also known as the CP0 or system control coprocessor) is a required coprocessor part of the MIPS32 and MIPS64 ISA which provides the facilities needed for an operating system.
Coprocessor 0 instructions[edit]
The following instructions can be used to read and write from CP0 registers.
| Mnemonic | Description |
|---|---|
| MFC0 | Move from Coprocessor 0 |
| MTC0 | Move to Coprocessor 0 |
Control Registers[edit]
| Register Mnemonic | Register Number | Description |
|---|---|---|
| Context | 0 | memory management (TLB) |
| Random | 1 | |
| EntryLo0 | 2 | |
| EntryLo1 | 3 | |
| Context | 4 | |
| PageMask | 5 | |
| Wired | 6 | |
| EntryHi | 10 | |
| HWREna | 7.0 | Sets user-privilege programs permissions |
| BadVAddr | 8 | Program address of the violation |
| Count | 9 | high-resolution time |
| Compare | 11 | |
| SR | 12 | Status Register |
| IntCtl | 12.1 | Interrupt vector setup |
| SRSCtl | 12.2 | Shadow register control |
| SRSMap | 12.3 | Shadow register map |
| Cause | 13 | Cause Register |
| EPC | 14 | Exception Program Counter |
| PRId | 15 | Product ID register |
| EBase | 15.1 | Exception entry point base address |
| Config | 16 | CPU setup |
| Config1 | 16.1 | |
| Config2 | 16.2 | |
| Config3 | 16.3 | |
| LLAddr | 17.0 | Cache address |
| Debug | 23.0 | EJTAG debug |
| DEPC | 24.0 | |
| DESAVE | 31.0 | |
| CacheErr | 27 | Memory error analysis registers |
| ECC | 26 | |
| ErrorEPC | 30 | |
| TagLo | 28 | Cache manipulation |
| DataLo | 28.1 | |
| TagHi | 29.0 | |
| DataHi | 29.1 | |
| WatchLo | 18.0 | Data watchpoint facility |
| WatchHi | 19.0 | |
| PerfCtl | 25.0 | Performance counter registers |
| PerfCnt | 25.1 |
