Removing and operation as it is not necessary.

@mhorne Thanks for the review!

Removed "pmu_events_mfr" function
Did not remove event codes in this review
Added space setting "pcd->pcd_allocate_pmc"
Added comment when setting "kern.hwpmc.cpuid"

Avoid creating new function and convert endian in existing functions.

[POWERPC] Switch endian of common dev information

Please, Can anyone review this?

Please, Can anyone review this?

Please, Can anyone review this?

Please, Can anyone review this?

Implement memcpy focused in performance

Added improvements based on Gustavo Romero review.

Improved strcmp performance

Hi Gustavo, thank you for you review. Considering your review and some additional changes, I improved the performance and now, at least, the performance is the same as the original solution.
Explaining: In the beginning of the code, it always tested if the address was aligned, which made the performance worst for short strings. I removed that check, assuming it always will align the address, even if it is already aligned. This change removed two instruction, the test and the branch.
I have reviewed the change for almost all your comments, but I couldn't figure out how to use the pipestat, as FreeBSD is not supported. Do you know if the AT works in CentOS? If so, I could test the code as is and run the pipestat.

Added improvements based on Gustavo Romero review.

Using registers as %r as requested.

Add a trap stack area

The reason of segmentation fault when treating the 0x1500 exception
was because it was being treated as a non-hypervisor trap, which
consider the registers srr0/srr1. As this trap is an hypervisor one,
the values were being placed in hsrr0/hsrr1.
Just changed the enter point for hypertrap, which saves the value of
hsrr0 and hsrr1 in srr0 and srr1.