From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jonathan Larmour To: MJLiu@mxic.com.tw Cc: ecos-discuss@sources.redhat.com Subject: Re: [ECOS] Questions about Interrupt and Handler? Date: Tue, 17 Jul 2001 08:05:00 -0000 Message-id: <3B54542F.96138ECA@redhat.com> References: X-SW-Source: 2001-07/msg00512.html MJLiu@mxic.com.tw wrote: > > 1. As we know, the relationship between exception type and its respective > vector address in ARM7TDMI is as follows: > > vector address exception type > 0x00 Reset > 0x04 Undefined Instruction > 0x08 SWI > 0x0C Prefetch Abort > 0x10 Data Abort > 0x14 Reserved > 0x18 IRQ > 0x1C FIQ > > And as we know, in eCos, there exist the mechanism of interrupts and > exceptions, and there are distinct spaces for exception and interrupt > vectors. > > My question is that which exception vector addresses of ARM7TDMI are for > exception vectors in eCos, and which are for interrupt vectors in eCos? All are exceptions except IRQ and FIQ which are interrupts (despite the indication otherwise in hal/arm/arch/current/inclued/hal_intr.h). Although Reset isn't really an exception anyway. > 2. I need to program exception and interrupt handlers for ARM7TDMI. So, are > there any source code examples for exception and interrupt handler > installation and manipulation? Most device drivers do. > 3. Are there any detailed documents and source code examples for VSR > (vector service routine) manipulation? > In eCos documents, it seems that they do not mention how to install > VSRs. Would someone tell me how to make it? http://sources.redhat.com/ecos/docs-latest/ref/ecos-ref.9.html#pgfId=1023460 It's an assembler routine. Examples are the default routines in vectors.S in hal/arm/arch Jifl -- Red Hat, Rustat House, Clifton Road, Cambridge, UK. Tel: +44 (1223) 271062 Maybe this world is another planet's Hell -Aldous Huxley || Opinions==mine Come to the Red Hat TechWorld open source conference in Brussels! Keynotes, techie talks and exhibitions http://www.redhat-techworld.com/