[Bug 203941] arm64 IMPLEMENT ME: dtrace_toxic_ranges

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=203941

--- Comment #1 from Ed Maste <emaste at freebsd.org> ---
And for quick reference:

/*
 * DTrace Toxic Ranges
 *
 * DTrace supports safe loads from probe context; if the address turns out to  
 * be invalid, a bit will be set by the kernel indicating that DTrace
 * encountered a memory error, and DTrace will propagate the error to the user 
 * accordingly.  However, there may exist some regions of memory in which an   
 * arbitrary load can change system state, and from which it is impossible to  
 * recover from such a load after it has been attempted.  Examples of this may 
 * include memory in which programmable I/O registers are mapped (for which a  
 * read may have some implications for the device) or (in the specific case of 
 * UltraSPARC-I and -II) the virtual address hole.  The platform is required   
 * to make DTrace aware of these toxic ranges; DTrace will then check that     
 * target addresses are not in a toxic range before attempting to issue a      
 * safe load.
 */

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