Re: [PATCH] - make sure that EFI variable data size is always 64 bit

[Matt Domsch]

On Sun, Mar 19, 2006 at 06:43:25PM +0000, Matthew Garrett wrote:
> The EFI spec states that the data size of an EFI variable is 64 bits. 
> "unsigned long", on the other hand, isn't on IA32.
> 
> diff --git a/drivers/firmware/efivars.c b/drivers/firmware/efivars.c
> index bda5bce..488c24c 100644
> --- a/drivers/firmware/efivars.c
> +++ b/drivers/firmware/efivars.c
> @@ -110,7 +110,7 @@ static LIST_HEAD(efivar_list);
>  struct efi_variable {
>  	efi_char16_t  VariableName[1024/sizeof(efi_char16_t)];
>  	efi_guid_t    VendorGuid;
> -	unsigned long DataSize;
> +	__u64	      DataSize;
>  	__u8          Data[1024];
>  	efi_status_t  Status;
>  	__u32         Attributes;
> diff --git a/include/linux/efi.h b/include/linux/efi.h
> index 9e97bc2..3f0a179 100644
> --- a/include/linux/efi.h
> +++ b/include/linux/efi.h
> @@ -163,7 +163,7 @@ typedef efi_status_t efi_get_wakeup_time
>  					    efi_time_t *tm);
>  typedef efi_status_t efi_set_wakeup_time_t (efi_bool_t enabled, efi_time_t *tm);
>  typedef efi_status_t efi_get_variable_t (efi_char16_t *name, efi_guid_t *vendor, u32 *attr,
> -					 unsigned long *data_size, void *data);
> +					 __u64 *data_size, void *data);
>  typedef efi_status_t efi_get_next_variable_t (unsigned long *name_size, efi_char16_t *name,
>  					      efi_guid_t *vendor);
>  typedef efi_status_t efi_set_variable_t (efi_char16_t *name, efi_guid_t *vendor, 



NAK.  efibootmgr, the main userspace consumer of this struct, also
thinks this is an "unsigned long".   This wasn't specified up through
EFI 1.10, which I complained about (it, and efi_status_t being defined
as an unsigned long) both force userspace consumers of this struct to
match size of the kernel (i.e. compile a 32-bit binary for 32-bit kernel,
and compile a 64-bit binary for 64-bit kernel).

-Matt


-- 
Matt Domsch
Software Architect
Dell Linux Solutions linux.dell.com & www.dell.com/linux
Linux on Dell mailing lists @ http://lists.us.dell.com
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