[Qemu-devel] Re: 452efb didn't show up in the list

[Artyom Tarasenko]

2010/4/1 Blue Swirl <address@hidden>:
> Which list?

This mailing list?

> On 4/1/10, Artyom Tarasenko <address@hidden> wrote:
>> and looks wrong or incomplete to me:
>>
>>  >According to Sun4M System Architecture Manual chapter 5.3.2, a limit
>>  >of 0 will not generate interrupts.
>>
>>  This is indeed correct, but the chapter 5.3.2 also explains why:
>>
>>  "Setting the limit register to  0  allows the counter to free run. Since the
>>  timer always resets to a value of 500 nS after reaching maximum count,
>>  there is no match and no interrupts are generated."
>>
>>  The part about 500 nS (0x00000200 in the counter register) and
>>  no match seems to be not addressed.
>
> The 500ns offset part could be addressed by making the timer period
> shorter by 1 tick. I doubt such a change would have any visible
> difference with QEMU, except that tick count of 0 should never appear
> in the counter but it may now.

as well as all the other values between 0 and 0x200. But it's less
important I guess.

> For the no match part, t->reached should not be set if t->limit == 0.


-- 
Regards,
Artyom Tarasenko

solaris/sparc under qemu blog: http://tyom.blogspot.com/