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Re: [Qemu-devel] [PATCH v2 03/13] armv7m: Rewrite NVIC to not use any GI
From: |
Alex Bennée |
Subject: |
Re: [Qemu-devel] [PATCH v2 03/13] armv7m: Rewrite NVIC to not use any GIC code |
Date: |
Fri, 24 Feb 2017 17:25:04 +0000 |
User-agent: |
mu4e 0.9.19; emacs 25.2.5 |
Peter Maydell <address@hidden> writes:
> On 16 February 2017 at 16:35, Peter Maydell <address@hidden> wrote:
>> From: Michael Davidsaver <address@hidden>
>>
>> Despite some superficial similarities of register layout, the
>> M-profile NVIC is really very different from the A-profile GIC.
>> Our current attempt to reuse the GIC code means that we have
>> significant bugs in our NVIC.
>>
>> Implement the NVIC as an entirely separate device, to give
>> us somewhere we can get the behaviour correct.
>>
>> This initial commit does not attempt to implement exception
>> priority escalation, since the GIC-based code didn't either.
>> It does fix a few bugs in passing:
>> * ICSR.RETTOBASE polarity was wrong and didn't account for
>> internal exceptions
>> * ICSR.VECTPENDING was 16 too high if the pending exception
>> was for an external interrupt
>> * UsageFault, BusFault and MemFault were not disabled on reset
>> as they are supposed to be
>>
>> Signed-off-by: Michael Davidsaver <address@hidden>
>> [PMM: reworked, various bugs and stylistic cleanups]
>> Signed-off-by: Peter Maydell <address@hidden>
>
>> + case 0x400 ... 0x5ef: /* NVIC Priority */
>> + startvec = 8 * (offset - 0x400) + NVIC_FIRST_IRQ; /* vector # */
>> +
>> + for (i = 0; i < size; i++) {
>
> Just noticed this line should be
> + for (i = 0; i < size && startvec + i < s->num_irq; i++) {
>
> which brings it into line with the nvic_sysreg_read() code
> and prevents an assert() in set_prio() if the guest writes to
> registers beyond the end of the implemented IRQ range.
>
>> + set_prio(s, startvec + i, (value >> (i * 8)) & 0xff);
>> + }
>> + nvic_irq_update(s);
>> + return;
>
> Unless there's some other problem that means I need
> to respin anyway I propose to just squash in that fix.
With the squashed fix:
Reviewed-by: Alex Bennée <address@hidden>
>
> thanks
> -- PMM
--
Alex Bennée
- [Qemu-devel] [PATCH v2 11/13] armv7m: Check exception return consistency, (continued)
- [Qemu-devel] [PATCH v2 11/13] armv7m: Check exception return consistency, Peter Maydell, 2017/02/16
- [Qemu-devel] [PATCH v2 08/13] armv7m: Simpler and faster exception start, Peter Maydell, 2017/02/16
- [Qemu-devel] [PATCH v2 07/13] armv7m: Remove unused armv7m_nvic_acknowledge_irq() return value, Peter Maydell, 2017/02/16
- [Qemu-devel] [PATCH v2 06/13] armv7m: Escalate exceptions to HardFault if necessary, Peter Maydell, 2017/02/16
- [Qemu-devel] [PATCH v2 05/13] arm: gic: Remove references to NVIC, Peter Maydell, 2017/02/16
- [Qemu-devel] [PATCH v2 04/13] armv7m: Fix condition check for taking exceptions, Peter Maydell, 2017/02/16
- [Qemu-devel] [PATCH v2 01/13] armv7m: Rename nvic_state to NVICState, Peter Maydell, 2017/02/16
- [Qemu-devel] [PATCH v2 03/13] armv7m: Rewrite NVIC to not use any GIC code, Peter Maydell, 2017/02/16
- Re: [Qemu-devel] [Qemu-arm] [PATCH v2 00/13] Rewrite NVIC to not depend on the GIC, Peter Maydell, 2017/02/16
- Re: [Qemu-devel] [Qemu-arm] [PATCH v2 00/13] Rewrite NVIC to not depend on the GIC, Alex Bennée, 2017/02/24
- Re: [Qemu-devel] [Qemu-arm] [PATCH v2 00/13] Rewrite NVIC to not depend on the GIC, Peter Maydell, 2017/02/24
- Re: [Qemu-devel] [Qemu-arm] [PATCH v2 00/13] Rewrite NVIC to not depend on the GIC, Peter Maydell, 2017/02/24
- Re: [Qemu-devel] [Qemu-arm] [PATCH v2 00/13] Rewrite NVIC to not depend on the GIC, Alex Bennée, 2017/02/24
- Re: [Qemu-devel] [Qemu-arm] [PATCH v2 00/13] Rewrite NVIC to not depend on the GIC, Peter Maydell, 2017/02/24
- Re: [Qemu-devel] [Qemu-arm] [PATCH v2 00/13] Rewrite NVIC to not depend on the GIC, Alex Bennée, 2017/02/24
- Re: [Qemu-devel] [Qemu-arm] [PATCH v2 00/13] Rewrite NVIC to not depend on the GIC, Peter Maydell, 2017/02/24
- Re: [Qemu-devel] [Qemu-arm] [PATCH v2 00/13] Rewrite NVIC to not depend on the GIC, Alex Bennée, 2017/02/24