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Re: [Xen-devel] [PATCH v3] xen:arm: Populate arm64 image header
- To: Amit Singh Tomar <amittomer25@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Andre Przywara <andre.przywara@xxxxxxx>
- Date: Wed, 12 Sep 2018 10:03:24 +0100
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- Cc: julien.grall@xxxxxxx, sstabellini@xxxxxxxxxx
- Delivery-date: Wed, 12 Sep 2018 09:03:04 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
Hi,
On 11/09/2018 17:48, Amit Singh Tomar wrote:
> This patch adds image size and flags to XEN image header. It uses
> those fields according to the updated Linux kernel image definition.
>
> With this patch bootloader can now place XEN image anywhere in system
> RAM at 2MB aligned address without to worry about relocation.
> For instance, it fixes the XEN boot on Amlogic SoC where bootloader(U-BOOT)
> always relocates the XEN image to an address range reserved for firmware data.
>
> Signed-off-by: Amit Singh Tomar <amittomer25@xxxxxxxxx>
Thanks, looks good to me now:
Reviewed-by: Andre Przywara <andre.przywara@xxxxxxx>
Cheers,
Andre.
> ---
> Changes since v2:
> * Undo changes in assembler.h(as suggested by Andre)
> Changes since v1:
> * Updated commit message
> * Removed endianess code
> ---
> xen/arch/arm/arm64/head.S | 11 +++++++++--
> 1 file changed, 9 insertions(+), 2 deletions(-)
>
> diff --git a/xen/arch/arm/arm64/head.S b/xen/arch/arm/arm64/head.S
> index d63734f..ef87b5c 100644
> --- a/xen/arch/arm/arm64/head.S
> +++ b/xen/arch/arm/arm64/head.S
> @@ -32,6 +32,13 @@
> #define PT_DEV 0xe71 /* nG=1 AF=1 SH=10 AP=01 NS=1 ATTR=100 T=0 P=1 */
> #define PT_DEV_L3 0xe73 /* nG=1 AF=1 SH=10 AP=01 NS=1 ATTR=100 T=1 P=1 */
>
> +#define __HEAD_FLAG_PAGE_SIZE ((PAGE_SHIFT - 10) / 2)
> +
> +#define __HEAD_FLAG_PHYS_BASE 1
> +
> +#define __HEAD_FLAGS ((__HEAD_FLAG_PAGE_SIZE << 1) | \
> + (__HEAD_FLAG_PHYS_BASE << 3))
> +
> #if (defined (CONFIG_EARLY_PRINTK)) && (defined (EARLY_PRINTK_INC))
> #include EARLY_PRINTK_INC
> #endif
> @@ -120,8 +127,8 @@ efi_head:
> add x13, x18, #0x16
> b real_start /* branch to kernel start */
> .quad 0 /* Image load offset from start of RAM
> */
> - .quad 0 /* reserved */
> - .quad 0 /* reserved */
> + .quad _end - start /* Effective size of kernel image,
> little-endian */
> + .quad __HEAD_FLAGS /* Informative flags, little-endian */
> .quad 0 /* reserved */
> .quad 0 /* reserved */
> .quad 0 /* reserved */
>
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