Re: HLA & OS development
- From: NoSpam@xxxxxxxxxxx (Bob Masta)
- Date: Wed, 12 Dec 2007 13:05:18 GMT
On Tue, 11 Dec 2007 16:43:42 -0500, "Rod Pemberton"
<spamtrap@xxxxxxxxxx> wrote:
"Bob Masta" <NoSpam@xxxxxxxxxxx> wrote in message
news:475e88f5.1111502@xxxxxxxxxxxxxxxxxxxxx
On Mon, 10 Dec 2007 21:51:18 -0500, "Rod Pemberton"less
<spamtrap@xxxxxxxxxx> wrote:
<snip>
3) any function which uses a privileged instruction won't be useable in
privileged code. e.g, use of rdtsc for some timing function won't be
useable by "user" code, aforementioned lgdt, lidt, etc.
RDTSC works just fine in user code.
It depends on privilege, specifically the state of the flag CR4.TSD...
Rod Pemberton
Bob Masta
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