linux-kernel - Re: [RFC PATCH] x86: make 64bit efi to use ioremap_cache for efi

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Date:	Thu, 11 Dec 2008 15:41:08 -0500
From:	"Jonathan Barkelew" <debtech@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] x86: make 64bit efi to use ioremap_cache for efi_ioremap

>> then how about use ioremap directly to replace fixed mapping in 64bit
>> with efi_ioremap?
>
> Because for kexec to work, EFI runtime memory area should be mapped to
> same virtual address across reboot.

Why would this require a separate function for 64-bit systems?
Wouldn't the 32-bit function have to take this into consideration as well?

Also, why is the fixed address space so limited? What about EFI runtime services
that are larger than 1MB?

Thanks,
Jonathan Barkelew
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