Improve device interrupt handling

fachat / GeckOS-V2

GeckOS version 2, a multi-tasking and multithreading operating system for the 6502

http://www.6502.org/users/andre/osa/index.html

GNU General Public License v2.0

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Improve device interrupt handling #77

Closed fachat closed 5 months ago

fachat commented 1 year ago

Device interrupts are currently handled via standard DEVCMD chain. Interrupt handling could be faster if:

separate interrupt chain, that only contains those devices that are not run inside the timer interrupt. In a C64 this would for example only be the RS232 device.
ack the timer interrupt in the kernel, then call a timer interrupt DEVCMD chain (like now)
The DEVCMD chain could then be made interruptible, with the kernel checking any re-entry

fachat commented 5 months ago

The kernel interrupt code has been cleaned up, with clear separation of hardware out to the architecture code. CHECKTIMER() now ack's a timer interrupt, and returns C=1 if it was the timer. The kernel then either sends DC_IRQ or DC_TIMER to the devices.

fachat commented 5 months ago

Interruptible devices are possible now.

(only console does cli, and only for short periods though - it is not really made for this due to setscr copying variables around at the beginning)