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Re: [Qemu-devel] [PATCH] 64 bit I/O support

From: Tristan Gingold
Subject: Re: [Qemu-devel] [PATCH] 64 bit I/O support
Date: Thu, 9 Apr 2009 17:45:58 +0200

On Apr 9, 2009, at 1:53 AM, Robert Reif wrote:

This patch is a rebase on current svn of my previous patch .

This patch adds support for 64 bit I/O by essentially replacing an
array of 4 function pointers with a structure containing 4 function
pointers. The current array contains 4 pointers, one for 8, 16 and 32
bit function pointers which really support only 32 bits and a
forth pointer which is unused but I assume is a place holder for a
64 bit function pointer. The current trick of passing 8, 16 or 32 bits
in a 32 bit variable doesn't extend to passing 64 bits in a 32 bit
bit variable and creating a 64 bit function would require casts to
allow being saved in the array so a sutrcture is used that can take
different function pointers.

Having a real 64 bit IO support is really useful for real 64 bit machines (sparc64, alpha...) as the current emulation makes things more complex and is unable to catch some erroneous accesses.

So I strongly support this patch.


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