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Re: [PATCH v4 2/3] xen/ppc: Relocate kernel to physical address 0 on boot
- To: Shawn Anastasio <sanastasio@xxxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 23 Aug 2023 08:47:09 +0200
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- Cc: Timothy Pearson <tpearson@xxxxxxxxxxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Wed, 23 Aug 2023 06:47:16 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 23.08.2023 01:03, Shawn Anastasio wrote:
> Introduce a small assembly loop in `start` to copy the kernel to
> physical address 0 before continuing. This ensures that the physical
> address lines up with XEN_VIRT_START (0xc000000000000000) and allows us
> to identity map the kernel when the MMU is set up in the next patch.
>
> We are also able to start execution at XEN_VIRT_START after the copy
> since hardware will ignore the top 4 address bits when operating in Real
> Mode (MMU off).
>
> Signed-off-by: Shawn Anastasio <sanastasio@xxxxxxxxxxxxxxxxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
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