On 12/13/13 at 12:30pm, Matt Fleming wrote:
> I agree with Borislav that this should be invoked from efisubsys_init().
> Also Dave, there's nothing inherently x86-specific about runtime-map.c -
> we've been trying not to dump arch-specific code in
> drivers/firmware/efi/.
>
> How about something like this, just to give you an idea? This would
> allow the ARM/ia64 folks to enable this code if they want at some later
> date. But more than that, it makes the code more self-contained and uses
> some real interfaces instead of relying on global variables,
>
> (not compile tested)
>
> ---
>
> diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
> index 94a1cbcf6e2e..f45ea41deae0 100644
> --- a/arch/x86/platform/efi/efi.c
> +++ b/arch/x86/platform/efi/efi.c
> @@ -76,8 +76,8 @@ static __initdata efi_config_table_type_t arch_tables[] = {
> {NULL_GUID, NULL, NULL},
> };
>
> -void *efi_runtime_map;
> -int nr_efi_runtime_map;
> +static void *efi_runtime_map;
> +static int nr_efi_runtime_map;
> static u64 efi_setup; /* efi setup_data physical address */
>
> /*
> @@ -1084,6 +1084,9 @@ void __init efi_enter_virtual_mode(void)
> }
> }
>
> + efi_runtime_map_setup(efi_runtime_map, nr_efi_runtime_map,
> + boot_params.efi_info.efi_memdesc_size);
> +
> BUG_ON(!efi.systab);
After this change, nr_efi_runtime_map become static, but since I'm moving
the parse_efi_setup to efi_64.c and nr_efi_runtime_map is set there for
kexec kernel use..
So I will just save the setup_data paddr as efi_setup in efi_64.c, and
move other code from parse_efi_setup() to below function which is called
in efi_init();
+static void __init efi_setup_init(void)
+{
+ struct setup_data *sd;
+
+ if (!efi_setup)
+ return;
+
+ sd = early_memremap(efi_setup, sizeof(struct setup_data));
+ if (!sd) {
+ pr_warn("early_memremap setup_data failed\n");
+ efi_setup = 0;
+ return;
+ }
+ efi_setup += sizeof(struct setup_data);
+ nr_efi_runtime_map = (sd->len - sizeof(struct efi_setup_data)) /
+ sizeof(efi_memory_desc_t);
+ early_memunmap(sd, sizeof(struct setup_data));
+}
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