On 08/17/2012 05:02 PM, Philippe Gerum wrote:
> On 08/17/2012 04:41 PM, Gilles Chanteperdrix wrote:
>> On 08/17/2012 04:24 PM, Charles Retailleau wrote:
>>> Thanks Lennart that was very useful, it now works.
>>> Here is the little patch I made, yet I couldn't find a switch to force
>>> it for core e500/e500xx only...
>>>
>>>
>>> --- ./xenomai-2.6.1.orig/include/asm-powerpc/syscall.h 2011-11-09
>>> 13:21:36.000000000 +0100
>>> +++ ./xenomai-2.6.1.mine/./include/asm-powerpc/syscall.h 2012-08-17
>>> 15:47:28.387435909 +0200
>>> @@ -167,9 +167,9 @@
>>> } u;
>>> unsigned long __tbu;
>>>
>>> - __asm__ __volatile__("1: mftbu %0\n"
>>> - "mftb %1\n"
>>> - "mftbu %2\n"
>>> + __asm__ __volatile__("1: mfspr %0,269\n"
>>> + "mfspr %1,268\n"
>>> + "mfspr %2,269\n"
>>> "cmpw %2,%0\n"
>>> "bne- 1b\n":"=r"(u.v[0]),
>>> "=r"(u.v[1]), "=r"(__tbu));
>>> Thanks to all for your help
>>> Charles,
>>
>> If I understand correctly, this patch breaks old powerpcs. So, do we
>> have a compilation constant allowing to know whether we are compiling
>> for an old or new powerpc?
>>
>
> For the sake of completeness, we could condition mftb to CONFIG_POWER3,
> all others we care for (i.e. >= ISA 2.01) do support mfspr 268.
>
is CONFIG_POWER3 available when configuring user-space support?
--
Gilles.
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