Re: [Minios-devel] [PATCH 03/40] arm64: add the boot code

[Julien Grall <julien.grall@xxxxxxxxxx>]

Hi Shijie,

More question about the boot code...

On 03/11/17 03:11, Huang Shijie wrote:
> +ENTRY(_start)
> +    /* Save the FDT pointer */
> +    mov     x20, x0
> +
> +    /* Calculate where we are */
> +    bl      _calc_offset
> +
> +    PRINT("- Mini-OS booting -\n")
> +
> +    PRINT("- Setup CPU -\n")
> +    /* Setup CPU for turning on the MMU. */
> +    bl      _setup_cpu
> +
> +    PRINT("- Setup booting pagetable -\n")
> +    /* Setup the initial page table. */
> +    bl      _setup_initial_pgtable
> +
> +    /* Setup the identity mapping */
> +    bl      _setup_idmap_pgtable
> +
> +    /* Load TTBRx */
> +    msr     ttbr1_el1, x4
> +    msr     ttbr0_el1, x5
First at all, this is not entirely obvious where x4 and x5 are been set. 
Proper documentation would be needed for that.
Now, IIUC the code TTBR0_EL1 will contain the identity mappings. I was 
expecting to see it removed as soon as MMU is enabled. But this does not 
seem to be the case. Why?
Cheers,

--
Julien Grall

_______________________________________________
Minios-devel mailing list
Minios-devel@xxxxxxxxxxxxxxxxxxxx
https://lists.xenproject.org/cgi-bin/mailman/listinfo/minios-devel