On 16 Jun 2014, at 22:41, Michael Tuexen <tue...@freebsd.org> wrote:
>
> On 16 Jun 2014, at 22:13, Mark R V Murray <ma...@freebsd.org> wrote:
>
>>
>> On 16 Jun 2014, at 20:38, Michael Tuexen <tue...@freebsd.org> wrote:
>>> Hmm, the documentation reads
>>
>> Which docs are you using?
>>
>> I’m using DDI0360F. (And that could easily be a wrong choice).
> That is what I'm also looking at. Selecting ARM1176...
>
> The code regarding _PMC_USER_READ_WRITE_ also needs to be adopted.
> I need to test it... I'll come back in a couple of hours...
Using the following updated patch in addition to your patch:
Index: cpufunc.c
===================================================================
--- cpufunc.c (revision 267555)
+++ cpufunc.c (working copy)
@@ -1409,7 +1409,20 @@
* BEWARE! This gives write access also, which may not be what
* you want!
*/
+#if defined(CPU_ARM1136) || defined(CPU_ARM1176)
#ifdef _PMC_USER_READ_WRITE_
+ /* Use Secure User and Non-secure Access Validation Control Register
+ to allow userland access */
+ __asm volatile ("mcr p15, 0, %0, c15, c9, 0\n\t"
+ :
+ : "r"(0x00000001));
+#endif
+ /* Set PMCR[2,0] to enable counters and reset CCNT */
+ __asm volatile ("mcr p15, 0, %0, c15, c12, 0\n\t"
+ :
+ : "r"(0x00000005));
+#else
+#ifdef _PMC_USER_READ_WRITE_
/* Set PMUSERENR[0] to allow userland access */
__asm volatile ("mcr p15, 0, %0, c9, c14, 0\n\t"
:
@@ -1426,6 +1439,7 @@
: "r"(0xFFFFFFFF),
"r"(0x00000005),
"r"(0x80000000));
+#endif
}
#endif
allows your test program to run successfully without root privileges, if I
compile the
kernel with _PMC_USER_READ_WRITE_ defined.
Best regards
Michael
>
> Best regards
> Michael
>>
>> M
>> --
>> Mark R V Murray
>>
>>
>
>
>
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