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From: "Rajesh Ghanekar" <ghanekar_rajesh@hotmail.com>
To: freebsd-hackers@freebsd.org
Date: Thu, 31 Mar 2005 00:40:15 +0530
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Subject: physical address to virtual address conversion
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Hi,

   I am trying to convert a physical memory location (address 0x000F0000)
to virtual memory address in kernel module with pmap_map() / pmap_enter().
Whenever i call these two functions, system hangs. Is this a proper
way for conversion?

  The same physical address can be accessed from the userspace by opening
/dev/mem. The code which does the memory mapping to /dev/mem at kernel
level is in ./sys/i386/i386/mem.c as mmrw() which also uses pmap_enter().

kernel = FreeBSD 4.10

- Rajesh

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