[Bug 225688] ppc64: Unable to read timebase

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225688

            Bug ID: 225688
           Summary: ppc64: Unable to read timebase
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: breno.leitao at gmail.com

Created attachment 190344
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=190344&action=edit
Get the timebase from the proper OF field.

After revision rS328534('PPC64: use hwref instead of cpuid'), FreeBSD on
powerpc64 virtual machine panics since it is unable to read the timebase,
showing the following error:

gcc version 4.2.1 20070831 patched [FreeBSD]
WARNING: WITNESS option enabled, expect reduced performance.
WARNING: Running on a broken hypervisor that does not support mandatory
H_CLEAR_MOD and H_CLEAR_REF hypercalls. Performance will be suboptimal.
VT: init without driver.

get-property for timebase-frequency on zero phandle

panic: Unable to determine timebase frequency!
cpuid = 0
time = 1
KDB: stack backtrace:
0xc000000000008510: at .kdb_backtrace+0x5c
0xc000000000008640: at .vpanic+0x1a4
0xc000000000008700: at .panic+0x38
0xc000000000008790: at .chrp_timebase_freq+0x44
0xc000000000008820: at .platform_timebase_freq+0x78
0xc0000000000088b0: at .decr_init+0x54
0xc000000000008980: at .cpu_startup+0x20
0xc000000000008a10: at .mi_startup+0x11c
0xc000000000008aa0: at btext+0xb4
KDB: enter: panic


With the change above,  cpuref->cr_hwref does not contain the phandle anymore,
thus, it never reads the proper CPU entry in OF.

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