Entry | |
---|---|
R4 | Bits 0-23: 1 (reason code) |
Bits 24-31: Driver number |
Exit | |
---|---|
R0-R3 | Corrupt |
R4 | 0 |
- | All other registers preserved |
The display driver should call this vector when a VSync interrupt occurs.
If a display driver receives this vector then it should ignore it and pass it on unmodified.
When the kernel receives this vector, it will claim it (by setting R4 to 0) and perform its usual VSync processing – updating the pointer position by issuing GraphicsV 5, releasing any foreground task waiting on OS_Byte 19, etc.