Re: [Xen-devel] [PATCH] xen/arm: UART addresses are not always aligned to a page.

[Julien Grall <julien.grall@xxxxxxxxxx>]

(+Adding ARM maintainers)

Hi,

On 10/24/2013 07:35 PM, Jon Fraser wrote:
> Add the page offset of the UART to the mapped address.
Thanks for the patch, can you also modify arm64 code?

> Signed-off-by: Jon Fraser <jfraser@xxxxxxxxxxxx>
> ---
>   xen/arch/arm/arm32/debug.S | 5 +++--
>   xen/arch/arm/arm32/head.S  | 3 ++-
>   2 files changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/xen/arch/arm/arm32/debug.S b/xen/arch/arm/arm32/debug.S
> index ec774cd..e095911 100644
> --- a/xen/arch/arm/arm32/debug.S
> +++ b/xen/arch/arm/arm32/debug.S
> @@ -22,18 +22,19 @@
>   #ifdef EARLY_PRINTK_INC
>   #include EARLY_PRINTK_INC
>   #endif
> +#define UART_OFFSET (EARLY_UART_BASE_ADDRESS & ~PAGE_MASK)
>
>   /* Print a character on the UART - this function is called by C
>    * r0: character to print */
>   GLOBAL(early_putch)
> -        ldr   r1, =FIXMAP_ADDR(FIXMAP_CONSOLE)  /* r1 := VA UART base address 
> */
> +        ldr   r1, =FIXMAP_ADDR(FIXMAP_CONSOLE) + UART_OFFSET  /* r1 := VA UART 
> base address */
You use FIXMAP_ADDR(FIXMAP_CONSOLE) + UART_OFFSET in different files. 
How about creating a define EARLY_UART_VIRTUAL_ADDRESS in 
asm-arm/early_printk.h?
--
Julien Grall

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