[PATCH v3 4/4] kexec, x86_64: Load bzImage64 above 4G

Yinghai Lu yinghai at kernel.org
Wed Nov 21 15:01:30 EST 2012

On Wed, Nov 21, 2012 at 11:56 AM, H. Peter Anvin <hpa at zytor.com> wrote:
> On 11/21/2012 11:54 AM, Yinghai Lu wrote:
>> in kernel arch/x86/kernel/head_64.S
>> it only set first 1G ident mapping. and if it find that code is above
>> 1G, it will set extra ident mapping
>> for new _text.._end.
>> To make checking and add extra mapping simple and also save two extra
>> pages for mapping.
>> Limit that _text.._end in them same GB range.
> No, this is backwards.

old one: it limited bzImage in [0,1G) aka the first 1G.

Now we can put it in any aligned 1G range.

So how could it be called backwards?

> We should fix that limitation instead.

sure, but that will make arch/x86/boot/compressed/head_64.S not need

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