Re: [Minios-devel] [UNIKRAFT/PLAT_RASPI PATCH 02/13] plats/raspi: Adding assembly CPU start file

[Julien Grall <julien@xxxxxxx>]

Hi,

On 09/01/2020 14:30, Santiago Pagani wrote:
> start.S is the file containing the initial code run by all cores in the 
> platform at boot time.
> Several things are happening here.
> 1- We first read the RTC from the SoC, to know how much time the GPU took for 
> booting and reseting the CPU.
> 2- We check the id of the cores, and halt any core other than core 0.
> 3- Configure main CPU registers to our needs.
> 4- Enter EL1 and setup the page tables.
> 5- If selected in the menuconfig, watermark the stack to measure the stack 
> usage.
> 6- Clear the BSS region.
> 7- Setup the stack pointer.
> 8- Restore the value of the RTC measured at the beginning of the file and jump 
> to _libraspiplat_entry.
>
> Signed-off-by: Santiago Pagani <santiagopagani@xxxxxxxxx>
> ---
>   start.S | 198 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
64-bit boot Arm should have nearly no differences between each platform. 
So why can't you re-use what's existing for KVM?
>   1 file changed, 198 insertions(+)
>   create mode 100644 start.S
>
> diff --git a/start.S b/start.S
> new file mode 100644
> index 0000000..04c938d
> --- /dev/null
> +++ b/start.S
> @@ -0,0 +1,198 @@
> +/*
> + * Copyright (C) 2018, bzt (bztsrc@github), 
> https://github.com/bztsrc/raspi3-tutorial
> + * Copyright (c) 2018, Sergey Matyukevich 
> <https://github.com/s-matyukevich/raspberry-pi-os>
Looking at the two links above, the code is largely based on Linux. So I 
am a bit surprised you are using a non-GPL license below. Do you mind 
giving more details?
Cheers,

--
Julien Grall

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