List of SITS system calls
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SITS system calls were done using EMT in older versions, and TRAP in newer. The system call number makes up the lower 7 bits. Bit 200 can be set to have the call fault on error, in which case a $ replaces the . in the symbolic name.
System call inputs are popped off the stack, and outputs are pushed. On error, the Z flag is set and arguments are left on the stack. In the table below, (C) indicates a capability.
| Number | Name | Description | Inputs | Outputs | |||
|---|---|---|---|---|---|---|---|
| 0 | .NOOP | - | - | - | |||
| 1 | .FORK | Create new process | Entry point | - | |||
| 2 | .POOFF | Kill this process | - | - | |||
| 3 | .SLEEP | Sleep | Time (least significant) | Time (most significant) | - | ||
| 4 | .SINK | Disable floating point | - | - | |||
| 5 | .FLOAT | Enable floating point | - | - | |||
| 6 | .INVOK | Invoke capability | Function,,capability (C) | argument | argument | (Variable) | |
| 7 | .QULK | Lock queue | Queue (C) | - | |||
| 10 | .QUNLK | Unlock queue | Queue (C) | - | |||
| 11 | .TTGIV | Give TTY away | Master sphere (C) | Teletype (C) | - | ||
| 12 | .TTGET | Get the TTY | Teletype (C) | - | |||
| 13 | .WRDI | Word input | File (C) | Data | |||
| 14 | .WRDO | Word output | File (C) | - | |||
| 15 | .BYTI | Byte input | File (C) | Data | |||
| 16 | .BYTO | Byte output | File (C) | - | |||
| 17 | .BLKI | Block input File (C) | File (C) | Length | Address | - | |
| 20 | .BLKO | Block output | File (C) | Length | Address | - | |
| 21 | .MAP | Create page | Access,,sphere (C) | Destination page,,source type | Source page | Page length,,page offset | - |
| 22 | .ALLOC | Allocate swap | Size | Start | Disk | - | |
| 23 | .CRUSR | Make this a user process | Copy name | Length of name | Pointer to name | - | |
| 24 | .RDMAP | Read map | Sphere (C) | Address | - | ||
| 25 | .FONT | Read or write font | Function,,font | Address | - | ||
| 26 | .SSTAT | Read system status | Address | - | |||
| 27 | .VIDSW | Set video switch modes | Source | Destination | - | ||
| 30 | .RUG | System sphere breakpoint to RUG | - | - | |||
| 31 | .GERRW | Get error word | - | (Variable) | |||
| 32 | .TIME | Get or set time | Address of six words: seconds, minutes, hours, days, months, years | - | |||
| 33 | .SYSJB | Perform system job | - | - | |||
| 34 | .GETID | Get process id | - | Id | |||
| 35 | .MFPI | Read word from instruction address space | Address | Data | |||
| 36 | .OSPAC | (?) | - | ||||
The .INVOK call is further decoded from the function:
| Number | Name | Description | Input |
|---|---|---|---|
| 200 | .DELCP | Delete capacity | - |
| 201 | .CPYCP | Copy capacity | Control bits to clear |
| 202 | .GIVCP | Give capacity to another sphere | Source |
| 203 | .TAKCP | Take capacity from the sphere | C-list |
