> to avoid confusion with the already existing riscv target in qemu and Am 30.12.19, 09:56 schrieb "Oberon im Auftrag von Paul Reed" : IF cpu = 53H THEN (* RISC5: with interrupts + floating-point, *)ĮLSIF cpu = 54H THEN (* RISC5a: no interrupts, no floating-point, *)
THE OBERON SYSTEM PDF CODE
You can ask the RISC processor to reveal its version with this code And as a side benefit it seems quite fast, comparatively. Of course this is just another emulator and the Oberon community already has plenty of those but I wanted to work with just one emulation platform across several porting efforts, and QEMU is to me the obvious choice. after I correct DIV for negative operands and finish floating point! Also, I missed the CPU version bits in the emulator - I will have to make sure the SYSTEM.H code works too.
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I'll make it clear that RISC5 is the correct name for the architecture. I thought I saw a way out of the name confusion. Sometimes I am too clever for my own good. PROCEDURE Off* BEGIN Interrupt.Install(NIL) END Off PROCEDURE On* BEGIN Interrupt.Install(Int) END On INC(cnt) IF cnt = 500 THEN led := 3 - led LED(led) cnt := 0 END PROCEDURE* Int (*interrupt handler called every millisecond*) With the above API, interrupts are easily consumable (no import of SYSTEM, all the nitty gritty details hidden in Interrupt.Mod) Kernel.Mod) or at least a module of the outer core to be provided with the standard distribution. Kernel.Install(SYSTEM.VAL(INTEGER, handler), 4) įor me something like the above should be part of the inner core (e.g. IF instr = 0A0E00000H THEN (* valid interrupt handler *)
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SYSTEM.GET(SYSTEM.VAL, INTEGER, handler)+4, instr)
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PROCEDURE Install*(handler: PROCEDURE) (* handler=NIL: deactivate interrupts *) OS support: an easy to use API to use the interrupt in a program. Compiler support: PROCEDURE* is parsed and correct instructions are generated. CPU support: instructions to enable/disable interrupts and return from interrupts. Offering interrupts to the programmer needs three parts: I don‘t find it user-friendly a programmer has to import SYSTEM and has to know the „magic“ address 4. The current implementation of interrupts looks to me a little bit like a quick and dirty hack or proof of concept. Oberon at mailing list for ETH Oberon and related systems My end goal is to trigger an interrupt (from firmware or otherwise) in reaction to stimulus without having to wait for the millisecond timer Can this method still be used for "real-time tasks" in which a procedure is run when an external stimulus changes? So far all the interrupt examples I've seen make use of interrupts triggered periodically by the millisecond timer. I see that Kernel.Install still exists in the RISC5 source. In which I believe interrupt handlers installed with Kernel.Install(Handler, N) are triggered when a device or buffer is updated? The details are unclear in the paper. In this Oberon-1 paper ( ) from 1996, Wirth discusses a method of "real-time tasks". I'm using Oberon on an embedded RISC5 system, and am able to modify both firmware and software.
THE OBERON SYSTEM PDF INSTALL
Instead of Kernel.Install you would call Interrupt.Install to install the interrupt handler.Īntworten an: ETH Oberon and related systems īetreff: Stimulus driven interrupts? a packet on the Ethernet board arrived or the temperature sensor says the meat is tender.īelow I attached an older mail on an “simple” API to facilitate programming with interrupts.
THE OBERON SYSTEM PDF FREE
inbus(inbus),īut you are totally free to set the CPU’s. irq, and the current RISC5Top.v hands over periodic interrupts with the Verilog code below The interrupt signal in the CPU is called. The interrupt signal is handed over by the HW to the RISC5 CPU in RISC5Top.v.
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