[PATCH 7/7] efi: write volatile EFI variables used by systemd

[Sascha Hauer]

On Thu, Jul 16, 2015 at 10:43:56AM +0200, Michael Olbrich wrote:
> LoaderTimeInitUSec and LoaderTimeExecUSec are used e.g. in systemd-analyze
> to calculate the time spent in the firmare and barebox.
> 
> LoaderDevicePartUUID is used to mount the EFI partition to /boot.
> 
> Signed-off-by: Michael Olbrich <m.olbrich at pengutronix.de>
> ---
>  arch/efi/efi/efi-image.c |  5 +++++
>  arch/efi/efi/efi.c       | 14 ++++++++++++++
>  common/efi-guid.c        |  1 +
>  include/efi.h            |  5 +++++
>  4 files changed, 25 insertions(+)
> 
> diff --git a/arch/efi/efi/efi-image.c b/arch/efi/efi/efi-image.c
> index f41322744bbc..89b712baab1f 100644
> --- a/arch/efi/efi/efi-image.c
> +++ b/arch/efi/efi/efi-image.c
> @@ -17,6 +17,7 @@
>   *
>   */
>  
> +#include <clock.h>
>  #include <common.h>
>  #include <linux/sizes.h>
>  #include <memory.h>
> @@ -242,6 +243,10 @@ static int do_bootm_efi(struct image_data *data)
>  			       boot_header->ramdisk_image);
>  		printf("...\n");
>  	}
> +
> +	efi_set_variable_usec("LoaderTimeExecUSec", &efi_systemd_vendor_guid,
> +			      get_time_ns()/1000);
> +
>  	linux_efi_handover(handle, boot_header);
>  
>  	return 0;
> diff --git a/arch/efi/efi/efi.c b/arch/efi/efi/efi.c
> index b0e98f95b02b..a665a546be90 100644
> --- a/arch/efi/efi/efi.c
> +++ b/arch/efi/efi/efi.c
> @@ -340,6 +340,7 @@ efi_status_t efi_main(efi_handle_t image, efi_system_table_t *sys_table)
>  	efi_physical_addr_t mem;
>  	size_t memsize;
>  	efi_status_t efiret;
> +	char *uuid;
>  
>  #ifdef DEBUG
>  	sys_table->con_out->output_string(sys_table->con_out, L"barebox\n");
> @@ -377,6 +378,19 @@ efi_status_t efi_main(efi_handle_t image, efi_system_table_t *sys_table)
>  	mem_malloc_init((void *)mem, (void *)mem + memsize);
>  
>  	efi_clocksource_init();
> +	efi_set_variable_usec("LoaderTimeInitUSec", &efi_systemd_vendor_guid,
> +			      get_time_ns()/1000);
> +
> +	uuid = device_path_to_partuuid(device_path_from_handle(
> +				       efi_loaded_image->device_handle));
> +	if (uuid) {
> +		wchar_t *uuid16 = strdup_char_to_wchar(uuid);
> +		efi_set_variable("LoaderDevicePartUUID",
> +				 &efi_systemd_vendor_guid,
> +				 EFI_VARIABLE_BOOTSERVICE_ACCESS |
> +				 EFI_VARIABLE_RUNTIME_ACCESS,
> +				 uuid16, (strlen(uuid)+1) * sizeof(wchar_t));
> +	}

Shouldn't you free uuid here?

Sascha


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