Re: [Xen-devel] [PATCH 2/2] xen/dts: Support Linux initrd DT bindings

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Mon, 2013-09-16 at 16:20 +0100, Julien Grall wrote:
> Linux uses the property linux,initrd-start and linux,initrd-end to know where
> the initrd lives in memory.
> 
> Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx>

Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>

> ---
>  xen/common/device_tree.c |   25 +++++++++++++++++++++++++
>  1 file changed, 25 insertions(+)
> 
> diff --git a/xen/common/device_tree.c b/xen/common/device_tree.c
> index 9a16650..906f9f9 100644
> --- a/xen/common/device_tree.c
> +++ b/xen/common/device_tree.c
> @@ -382,6 +382,29 @@ static void __init process_multiboot_node(const void 
> *fdt, int node,
>          early_info.modules.nr_mods = nr;
>  }
>  
> +static void __init process_chosen_node(const void *fdt, int node,
> +                                       const char *name,
> +                                       u32 address_cells, u32 size_cells)
> +{
> +    struct dt_mb_module *mod = &early_info.modules.module[MOD_INITRD];
> +    u32 start, end;
> +
> +    dt_printk("Checking for initrd in /chosen\n");
> +
> +    start = device_tree_get_u32(fdt, node, "linux,initrd-start", 0);
> +    end = device_tree_get_u32(fdt, node, "linux,initrd-end", 0);
> +
> +    if ( !start || !end || (start >= end) )
> +        return;
> +
> +    dt_printk("Initrd 0x%x-0x%x\n", start, end);
> +
> +    mod->start = start;
> +    mod->size = end - start;
> +
> +    early_info.modules.nr_mods = MAX(MOD_INITRD, early_info.modules.nr_mods);
> +}
> +
>  static int __init early_scan_node(const void *fdt,
>                                    int node, const char *name, int depth,
>                                    u32 address_cells, u32 size_cells,
> @@ -391,6 +414,8 @@ static int __init early_scan_node(const void *fdt,
>          process_memory_node(fdt, node, name, address_cells, size_cells);
>      else if ( device_tree_node_compatible(fdt, node, "xen,multiboot-module" 
> ) )
>          process_multiboot_node(fdt, node, name, address_cells, size_cells);
> +    else if ( depth == 1 && device_tree_node_matches(fdt, node, "chosen") )
> +        process_chosen_node(fdt, node, name, address_cells, size_cells);
>  
>      return 0;
>  }



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