On 08/17/2012 05:11 PM, Gilles Chanteperdrix wrote:
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?
No, but actually, I never ported Xenomai to power3 and will likely never
do this. It's the early 64bit server architecture; we won't officially
support any 64bit platform which does not comply with ISA 2.04 at least
anyway. Best effort would be to depend on a gcc define built-in for
mcpu=power3 if any.
--
Philippe.
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