Disabling interrupt with the ARM GIC (global interrupt controller) -



Disabling interrupt with the ARM GIC (global interrupt controller) -

i have specific requirement nee disable device interrupt specific period without affecting other interrupts(code running on arm processor). arm document pointed gic registers (related enable, disable , clear interrupts) of arm banked registers, there 1 per cpu interface. banked registers accessible designated cpu , controls cpu's ppi , sgi interrupts only.

what mean? if disable specific interrupt writing gic register, disabled on core or on cores?

there 2 register sets gic; banked per cpu set , distribution (also distributor) scheme global gic. link above, irqenset0 per-cpu register banked (again) , handles ppi , sgi interrupts cpu. irqenset1 list of global interrupts , these maybe disable. distribution (also distributor) can target interrupts cpu.

arm has many different names these registers , different versions of gic. concepts same of them. there set of registers not banked per-cpu , these command things globally including disabling interrupts scheme wide. reader competent plenty find , read specific controller documentation soc.

what mean? if disable specific interrupt writing gic register, disabled on core or on cores?

ppi - peripheral private interrupt. example, per-cpu timer in smp systems. sgi - software generated interrupt. known ipi on other systems. allows signaling 1 cpu cpu. (ipi inter-processor interrupt).

these interrupts create sense each , every cpu. however, hardware ethernet, spi, video, can bus, i2c, adc, etc. scheme global.

for distributor registers, global interrupts have read/write enable/disable. registers per-cpu read-only in distributor , indicate interrupt present. other set of registers (per-cpu) normal mechanism enable/disable interrupt per-cpu. software should have inter-lock (semaphore) when accessing distributor global system. alternatively, elected or boot cpu utilize distributor. per-cpu registers banked core may perform read-modify-write without worrying race conditions.

reference: arm generic interrupt controller - architecture specification, may require registration.

arm

Comments

Post a Comment

Popular posts from this blog

xslt - DocBook 5 to PDF transform failing with error: "fo:flow" is missing child elements. Required content model: marker* -

xslt - DocBook 5 to PDF transform failing with error: "fo:flow" is missing child elements. Required content model: marker* - i've inherited doc publishing process takes docbook , builds html , pdf output, using apache fop both. project had been started, never completed. lots of tweaking, i've able of doc sets build (20+), except handful, , fail severe code 1 of these 2 conditions: "fo:flow" missing kid elements. required content model: marker* "fo:block" not valid kid of "fo:root" the xml output comes out of docbook , docbook-fop checks out well-formed. the fop error in 1 book, "endecagloss", example, points end of string: <fo:flow flow-name="xsl-region-body" start-indent="4pc" end-indent="0pt"/> here’s log output in case: [java] severe: javax.xml.transform.transformerexception: file:/scratch/publishing/hudson/jobs/build-main-endeca-documentation/workspace/serverdoc/w...
Read more

mediawiki - How do I insert tables inside infoboxes on Wikia pages? -

mediawiki - How do I insert tables inside infoboxes on Wikia pages? - i want insert tables in infoboxes. example, have proteinbox i've developed using infobox template (http://health-and-medicine.wikia.com/wiki/template:proteinbox), , fasta field big fit comfortably in proteinbox. hence collapsible table within box. this tried: {{infobox | row 1 = {| class = "mw-collapsible mw-collapsed wikitable" |- | <!-- table content --> |} }} your problem is, putting nested table within template. pipe characters ( | ) in table syntax collides pipe usage in templates. the commonly used hack around create template called template:! , containing pipe character, , utilize when need set tables, parser functions or other stuff using pipe characters, within templates. table (with every | replaced {{!}} ): {{{!}} {{!}}- {{!}} a1 {{!}} b1 {{!}}- {{!}} a2 {{!}} b2 {{!}}} ...the equivalent of {| |- | a1 | b1 |- | a2 | b2 |} furthermore, hav...
Read more

Local Service User Logged into Windows -

Local Service User Logged into Windows - i created windows service tracks app server user connected through load balancer. it retrieves user logged windows on machine, cross references active directory (ad) business relationship homecoming first name, lastly name , e-mail (for notification through website created project) there 1 scheme on network users remote system, vista system, reason returning values "local service" logged machine, it's weird , security guys impossible "local service" business relationship logged windows. here how user logged windows managementscope ms = new managementscope("\\\\.\\root\\cimv2"); objectquery query = new objectquery("select * win32_computersystem"); managementobjectsearcher searcher = new managementobjectsearcher(ms, query); foreach (managementobject mo in searcher.get()) { _username = mo["username"].tostring(); } // remove domain part username string[] usernameparts = _...
Read more