Gilles Chanteperdrix wrote:
> Mark Saiia wrote:
>> Hello,
>>
>> The switchtest output is as follows. This was run on 2.4.5 with 2.6.26.3
>> AMD Geode LX800 board.
>> In order to get it to run, I had to remove modprobe xeno_native from my
>> start-up script. I don't know if that is an expected requirement prior to
>> running the test.
>>
>> == Testing FPU check routines...
>> r0: 1 != 2
>> r1: 1 != 2
>> r2: 1 != 2
>> r3: 1 != 2
>> r4: 1 != 2
>> r5: 1 != 2
>> r6: 1 != 2
>> r7: 1 != 2
>> == FPU check routines: OK.
>> == Threads: sleeper_ufps-0 rtk-1 rtk-2 rtk_fp-3 rtk_fp-4 rtk_fp_ufpp-5
>> rtk_fp_ufpp-6 rtup-7 rtup-8 rtup_ufpp-9 rtup_ufpp-10 rtus-11 rtus-12
>> rtus_ufps-13 rtus_ufps-14 rtuo-15 rtuo-16 rtuo_ufpp-17 rtuo_ufpp-18
>> rtuo_ufps-19 rtuo_ufps-20 rtuo_ufpp_ufps-21 rtuo_ufpp_ufps-22
>> RTT| 00:00:01
>> RTH|ctx switches|-------total
>> RTD| 17250| 17250
>> RTD| 17250| 34500
>> RTD| 17250| 51750
>> RTD| 17250| 69000
>> RTD| 17273| 86273
>> RTD| 17273| 103546
>> RTD| 17273| 120819
>> RTD| 17250| 138069
>> RTD| 17250| 155319
>> RTD| 17273| 172592
>> RTD| 17250| 189842
>> RTD| 17250| 207092
>> RTD| 17273| 224365
>> RTD| 17273| 241638
>> RTD| 17273| 258911
>> RTD| 17250| 276161
>> RTD| 17250| 293411
>> RTD| 17250| 310661
>> RTD| 17273| 327934
>> RTD| 17273| 345207
>> RTD| 17250| 362457
>>
>> Thanks in advance for any help.
>>
>> Mark Saiia
>
>
> Hi,
>
> It seems you do not get the same error with switchtest as you get with
> your test program. I had a look at linux fpu handling, and it seems to
> be very different from Xenomai fpu handling. I need to dig a little bit
> more, but will send you a patch soon.
Here comes the promised patch.
Index: include/asm-x86/bits/pod_32.h
===================================================================
--- include/asm-x86/bits/pod_32.h (revision 4355)
+++ include/asm-x86/bits/pod_32.h (working copy)
@@ -194,16 +194,37 @@ static inline void xnarch_init_thread(xn
static inline void xnarch_init_fpu(xnarchtcb_t * tcb)
{
struct task_struct *task = tcb->user_task;
+ x86_fpu_state *fpup = tcb->fpup;
/* Initialize the FPU for a task. This must be run on behalf of the
task. */
- __asm__ __volatile__("clts; fninit");
+ if (cpu_has_fxsr) {
+ struct i837_fxsave_struct *fx = &fpup->fxsave;
- if (cpu_has_xmm) {
- unsigned long __mxcsr = 0x1f80UL & 0xffbfUL;
- __asm__ __volatile__("ldmxcsr %0"::"m"(__mxcsr));
- }
+ memset(fx, 0, sizeof(*fx));
+ fx->cwd = 0x37f;
+ if (cpu_has_xmm) {
+ unsigned long __mxcsr = 0x1f80UL & 0xffbfUL;
+ fx->mxcsr = __mxcsr;
+ }
+
+ clts();
+
+ __asm__ __volatile__("fxrstor %0": /* no output */ :"m"(*fx));
+ } else {
+ struct i387_fsave_struct *fp = &fpup->fsave;
+
+ memset(fp, 0, sizeof(*fp));
+ fp->cwd = 0xffff037fu;
+ fp->swd = 0xffff0000u;
+ fp->twd = 0xffffffffu;
+ fp->fos = 0xffff0000u;
+
+ clts();
+ __asm__ __volatile__("frstor %0": /* no output */ :"m"(*fp));
+ }
+
if (task) {
/* Real-time shadow FPU initialization: tell Linux that this
thread initialized its FPU hardware. The fpu usage bit is
--
Gilles.
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