* question about reserve_bios_regions
@ 2019-01-04 7:35 Cao jin
0 siblings, 0 replies; only message in thread
From: Cao jin @ 2019-01-04 7:35 UTC (permalink / raw)
To: Thomas Gleixner, Ingo Molnar, bp, H. Peter Anvin; +Cc: x86, LKML
Hi,
I am looking into these code via find_trampoline_placement, and I have
some questions still not clear after lots of investigation, hope to get
some hints.
1. How is the value of BIOS_START_MIN(128k) determined? I don't find any
clue about it until now.
2. BIOS_START_MAX is define as 0x9f000U(636k), but both the comments say
640k, is that a quirk or just typo? I thought the 4k difference is the
quirk, but later I guess the real quirk lies in latter judgment of :
if (ebda_start >= BIOS_START_MIN && ebda_start < bios_start)
I have checked out commit edce21216a8: ("x86/boot: Reorganize and clean
up the BIOS area reservation code"), still no clue.
--
Sincerely,
Cao jin
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