How is what done, the transition from UserMode to Kernel? It is done on a
recent x86 platform using SYSENTER, and on older x86’s using a trap. I don’t
think I understand what your actual question is.
-----Original Message-----
From: Saxena, Ajitabh Prakash [mailto:xxxxx@lsil.com]
Sent: Thursday, June 19, 2003 11:30 AM
To: NT Developers Interest List
Subject: [ntdev] RE: How Does a application switches from user mode to Ker
nal mode
Then what in the case of a call to “ReadFile” in user mode application ??
This requires the switch from user mode to kernal mode…right?? how is this
done??
-----Original Message-----
From: Roddy, Mark [mailto:xxxxx@stratus.com]
Sent: Thursday, June 19, 2003 11:22 AM
To: NT Developers Interest List
Subject: [ntdev] RE: How Does a application switches from user mode to Ker
nal mode
The timer interrupt handler in the kernel starts the whole mess going.
-----Original Message-----
From: Saxena, Ajitabh Prakash [mailto:xxxxx@lsil.com]
Sent: Thursday, June 19, 2003 11:16 AM
To: NT Developers Interest List
Subject: [ntdev] How Does a application switches from user mode to Kernal
mode
hi all,
I read in Newcomer’s book that whenever a quantum of anythread
expires a DISPATCH_LEVEL software interrupt is generated (using x86’s int
instruction).
My Questions are:
1> Say if the thread is running in user mode and it’s quantum expires
1> will
it still call “int” from “user mode”.
2> Don’t we have to be in kernal mode to generate a software interrupt
2> ???
If we have to be in kenal to use software INT instrustion then how does this
switch takes place??
Anyother details are highly appriciated.
Thanks
ajitabh
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