https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233863
--- Comment #43 from Mark Millard <[email protected]> ---
(In reply to Justin Hibbits from comment #40)
Continuity and common structure certainly are
considerations.
For reference, I updated my code to dump out
the HID0, HID1, HID4, and HDI5 values for the
ap's, dumping values from both before FreeBSD
changes them and after they are changed. I was
curious. The result was:
HIOR(311) before: fff00000, 0 after
before: HID0 fc1c000000000000
after: HID0 0151108100000000
before: HDI1 0
after: HDI1 fd3c200000000000
before: HID4 10000000000, HID5 0
after: HID4 1000000000, HID5 0
So differences in:
(Hopefully I matched everything up correctly)
HID0: one_ppc, do_single, isync_sc, ser-gp, reserved bits 4:5,
deep nap, doze, nhr, ext_tb_en, reserved bit 24, en_attn.
HID1: bht_pm, en_ls, en_cc, en_ic, pf_mode, en_if_cach,
en_ic_rec, ic_pe.
HID4: rm_ci, en_sp_dtw.
HID5: none.
I'll note that en_ic is described with:
QUOTE
Enable instruction cache (must be ‘1’ for proper functioning).
END QUOTE
(Not that there is a description of what the improper functioning
of the 970MP would be.) This was the wording I was most
worried about.
[There are some other bits that have differences from "preferred
state", not that I know the importance of them.]
[slbtrap and handle_kernel_slb_spill are using mftb() and so
ext_tb_en being different is in use before HID0 is updated.]
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