Possible error in dtrace

[Siddharth Muralee <siddharth.muralee%gmail.com@localhost>]

Hello,

      While going through sys/arch/amd64/pmap.h, I came across KERN_BASE[1] and confused it for KERNBASE[2]. Looking deeper into the same I think someone made the same mistake in dtrace_isa.c{3](I might be wrong). 

    I compared how the same variable was used in amd64[4] and i386[5]. There seems to be a mismatch. I computed the values for KERN_BASE and KERNBASE for amd64 and 

• KERN_BASE = 0x800000000000
• KERNBASE = 0xffffffff80000000

I think this may be an error. However, the names are definitely a bit confusing and there is no documentation to suggest what they are for. 

[1] https://nxr.netbsd.org/xref/src/sys/arch/amd64/include/pmap.h#161

[2] https://nxr.netbsd.org/xref/src/sys/arch/amd64/include/param.h#41

[3] https://nxr.netbsd.org/xref/src/external/cddl/osnet/dev/dtrace/amd64/dtrace_isa.c

[4] https://nxr.netbsd.org/xref/src/external/cddl/osnet/dev/dtrace/amd64/dtrace_isa.c#48

[5] https://nxr.netbsd.org/xref/src/external/cddl/osnet/dev/dtrace/i386/dtrace_isa.c#41

--

Regards, 

  Siddharth M
  Third Year B.Tech (CSE) Student,
  Amrita School of Engineering, Kollam

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