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From: | "Gerrit van Niekerk" <gerritvn AT gpvno DOT co DOT za> |
Organization: | GPvNO |
To: | djgpp AT delorie DOT com |
Date: | Mon, 21 Jan 2008 22:13:10 +0200 |
MIME-Version: | 1.0 |
Subject: | RM/PM ISR |
Message-ID: | <479518F6.7820.CAEFE78@gerritvn.gpvno.co.za> |
X-mailer: | Pegasus Mail for Windows (4.41) |
Reply-To: | djgpp AT delorie DOT com |
Looking at the GDB serial port driver SER-GO32.C, I notice that the RM ISR is implemented as a _go32_dpmi_allocate_real_mode_callback_iret to the PM ISR. My question: Is there really an advantage in implementing a RM ISR this way? An interrupt in RM will result in a switch to PM which would have happened anyway if there was no RM ISR and the interrupt got reflected to PM. Anything I'm missing?
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