/* startup.s - start */ DISABLE = 340 / PS to disable interrupts /*------------------------------------------------------------------------ /* Xinu system entry point -- first location beyond interrupt vectors /*------------------------------------------------------------------------ .globl start, _restart _restart: / a name used by C for reboot start: mtps $DISABLE / Disable interrupts mov $kernstk,sp / set up temporary stack pointer jsr pc,sizmem / _maxaddr set to max address mov _maxaddr,sp / switch stack to high memory tst -(sp) / leave space for MAGIC word reset / reset bus clr r5 / clear initial r5 for debugging clr r4 jmp _nulluser / Jump to C startup routine