On Mon, Dec 09, 2013 at 05:42:20PM +0800, Dave Young wrote:
> Export fw_vendor, runtime and config table physical addresses to
> /sys/firmware/efi/fw_vendor, /sys/firmware/efi/runtime and
> /sys/firmware/efi/config_table because kexec kernel will need them.
you might wanna shorten:
... sys/firmware/efi/{fw_vendor,runtime,config_table} ...
>
> From EFI spec these 3 variables will be updated to
> virtual address after entering virtual mode. But
> kernel startup code will need the physical address.
>
> changelog:
> Greg: add standalone sysfs files instead of add lines to systab
> Document them as testing ABI
> Greg: use group attrs and is_visible
> Boris: align comments lines
> Boris: add macros for _show functions
> Matt: Documentation fixes.
>
> Signed-off-by: Dave Young <dyoung@xxxxxxxxxx>
> ---
> Documentation/ABI/testing/sysfs-firmware-efi | 24 +++++++++++++++++
> arch/x86/platform/efi/efi.c | 4 +++
> drivers/firmware/efi/efi.c | 39 ++++++++++++++++++++++++++++
> include/linux/efi.h | 3 +++
> 4 files changed, 70 insertions(+)
> create mode 100644 Documentation/ABI/testing/sysfs-firmware-efi
>
> diff --git a/Documentation/ABI/testing/sysfs-firmware-efi b/Documentation/ABI/testing/sysfs-firmware-efi
> new file mode 100644
> index 0000000..8c6e460
> --- /dev/null
> +++ b/Documentation/ABI/testing/sysfs-firmware-efi
> @@ -0,0 +1,24 @@
> +What: /sys/firmware/efi/fw_vendor
> +Date: December 2013
> +Contact: Dave Young <dyoung@xxxxxxxxxx>
> +Description:
> + It shows the physical address of firmware vendor field in the
Why doesn't this start at the same line as "Description:"?
> + EFI system table.
> +
Superfluous newline.
> +Users: Kexec
> +
> +What: /sys/firmware/efi/runtime
> +Date: December 2013
> +Contact: Dave Young <dyoung@xxxxxxxxxx>
> +Description:
> + It shows the physical address of runtime service table entry in
> + the EFI system table.
> +Users: Kexec
> +
> +What: /sys/firmware/efi/config_table
> +Date: December 2013
> +Contact: Dave Young <dyoung@xxxxxxxxxx>
> +Description:
> + It shows the physical address of config table entry in the EFI
> + system table.
> +Users: Kexec
> diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
> index 7778b5f..3e8b760 100644
> --- a/arch/x86/platform/efi/efi.c
> +++ b/arch/x86/platform/efi/efi.c
> @@ -653,6 +653,10 @@ void __init efi_init(void)
>
> set_bit(EFI_SYSTEM_TABLES, &x86_efi_facility);
>
> + efi.config_table = (unsigned long)efi.systab->tables;
> + efi.fw_vendor = (unsigned long)efi.systab->fw_vendor;
> + efi.runtime = (unsigned long)efi.systab->runtime;
> +
> /*
> * Show what we know for posterity
> */
> diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
> index b716a66..0ecccab 100644
> --- a/drivers/firmware/efi/efi.c
> +++ b/drivers/firmware/efi/efi.c
> @@ -32,6 +32,9 @@ struct efi __read_mostly efi = {
> .hcdp = EFI_INVALID_TABLE_ADDR,
> .uga = EFI_INVALID_TABLE_ADDR,
> .uv_systab = EFI_INVALID_TABLE_ADDR,
> + .fw_vendor = EFI_INVALID_TABLE_ADDR,
> + .runtime = EFI_INVALID_TABLE_ADDR,
> + .config_table = EFI_INVALID_TABLE_ADDR,
> };
> EXPORT_SYMBOL(efi);
>
> @@ -71,13 +74,49 @@ static ssize_t systab_show(struct kobject *kobj,
> static struct kobj_attribute efi_attr_systab =
> __ATTR(systab, 0400, systab_show, NULL);
>
> +#define EFI_FIELD(var) efi.var
> +
> +#define EFI_ATTR_SHOW(name) \
> +static ssize_t name##_show(struct kobject *kobj, \
> + struct kobj_attribute *attr, char *buf) \
> +{ \
> + return sprintf(buf, "0x%lx\n", EFI_FIELD(name)); \
> +}
> +
> +EFI_ATTR_SHOW(fw_vendor);
> +EFI_ATTR_SHOW(runtime);
> +EFI_ATTR_SHOW(config_table);
> +
> +static struct kobj_attribute efi_attr_fw_vendor = __ATTR_RO(fw_vendor);
> +static struct kobj_attribute efi_attr_runtime = __ATTR_RO(runtime);
> +static struct kobj_attribute efi_attr_config_table = __ATTR_RO(config_table);
> +
> static struct attribute *efi_subsys_attrs[] = {
> &efi_attr_systab.attr,
> + &efi_attr_fw_vendor.attr,
> + &efi_attr_runtime.attr,
> + &efi_attr_config_table.attr,
> NULL, /* maybe more in the future? */
^^^^^
Now that there's more, you can drop that wise guy comment :)
--
Regards/Gruss,
Boris.
Sent from a fat crate under my desk. Formatting is fine.
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