Re: [PATCH 2/2] xen/arm64: head: Allow to use early printk while on 1:1 mapping

[Julien Grall <julien@xxxxxxx>]

Hi Michal,

On 15/01/2024 12:48, Michal Orzel wrote:
> Take an example from commit 1ec3fe1f664f ("xen/arm32: head: Improve
> logging in head.S") to add support for printing early boot messages
> while running on identity mapping:
>   - define PRINT_SECT() macro to be able to specify a section for storing
>     a string. PRINT() will use .rodata.str and PRINT_ID() - .rodata.idmap.
>     This is necessary, because when running on identity mapping, the
>     strings need to be part of the first page that is mapped,
>   - move loading a runtime virtual UART address right after enabling MMU
>     (the corresponding steps repeated in {primary,secondary}_switched are
>     now consolidated in a single place),
>   - move early printk 'hex' string into .rodata.idmap and replace 'adr'
>     instruction in asm_putn with 'adr_l' to extend the addressable range,
>   - remove RODATA_STR() macro given no use.
>
> Signed-off-by: Michal Orzel <michal.orzel@xxxxxxx>
I have tested with my upcoming series to get all pre-MMU code in a 
single page.
Acked-by: Julien Grall <jgrall@xxxxxxxxxx>

Cheers,

--
Julien Grall