From: Hai Vo-Ba <hai@fc.hp.com>
To: rbradetich@uswest.net
Cc: parisc-linux@thepuffingroup.com
Subject: Re: [parisc-linux] Questions understanding exec_kernel
Date: Wed, 22 Sep 1999 06:46:31 -0600 (MDT) [thread overview]
Message-ID: <199909221246.GAA29606@hpeshai.fc.hp.com> (raw)
In-Reply-To: <37E82CE6.3A5DFFB0@uswest.net> from Ryan Bradetich at Sep "21," 1999 "07:12:06" pm
> .EXIT
> rfi ; begin execution of kernel.
> nop
> [Question: Page 5-139 from the PA-RISC 1.1 Architecture and Instruction
> Set Reference Manual states: "Execution of an RFI instruction when any
> of the PSW !, I, or R bits are ones is an undefined operation." We are
> explicitly setting the Q & I bits before calling the rfi command. I
> don't understand how this works ... ]
> .PROCEND
If I remember right, RFI followed by a NOP is an idiom to tell the CPU
to start fetching instructions from an absolute address pointed to by the
IVA so we usually want to that with interrupts enabled (Q & I bits set).
--Hai
>
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next prev parent reply other threads:[~1999-09-22 12:44 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-09-22 1:12 [parisc-linux] Questions understanding exec_kernel Ryan Bradetich
1999-09-22 4:26 ` Grant Grundler
1999-09-22 6:45 ` [parisc-linux] C360 boot problem Hannu Martikka
1999-09-22 13:34 ` Philipp Rumpf
1999-09-22 13:32 ` [parisc-linux] Questions understanding exec_kernel Philipp Rumpf
1999-09-22 12:46 ` Hai Vo-Ba [this message]
1999-09-22 13:36 ` Philipp Rumpf
1999-09-22 13:29 ` Philipp Rumpf
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