On 9 June 2014 13:54, Vivek Goyal <vgoyal@xxxxxxxxxx> wrote: > Hi Matt, > > So with new kexec syscall I have written 64bit bzImage loader. For now > I would like to detect this situation and disable loading and once > 32bit loader gets implemented it can take care of loading bzImage below > 4G. What situation do you want to detect? You want to detect when it's impossible to load a kernel above 4G in the kexec path because you're booting with 32-bit EFI firmware? > So how do I find out if EFI is 32bit. efi_enabled(EFI_64BIT) will tell you that, but you probably also want to check that EFI runtime services are actually usable with efi_enabled(EFI_RUNTIME_SERVICES) since if they're not, you'll never call into the firmware so it doesn't matter where you load the kernel (this may happen with "noefi" kernel parameter). -- To unsubscribe from this list: send the line "unsubscribe linux-efi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
