[systemd-devel] [PATCH 5/5] Auto detect both x64 and ia32 boot*.efi payloads

[Darren Hart]

On Wed, 2013-08-21 at 13:16 -0700, Darren Hart wrote:
> On Wed, 2013-08-21 at 21:31 +0200, Kay Sievers wrote:
> > On Wed, Aug 21, 2013 at 9:26 PM, Darren Hart <dvhart at linux.intel.com> wrote:
> > > On Wed, 2013-08-21 at 20:59 +0200, Kay Sievers wrote:
> > >> On Wed, Aug 21, 2013 at 8:13 PM, Darren Hart <dvhart at linux.intel.com> wrote:
> > >> > The EFI specification documents /EFI/BOOT/bootx64.efi for x86_64
> > >> > machines and /EFI/BOOT/bootia32.efi for ia32 machines. Update the auto
> > >> > detection to allow for both.
> > >> >
> > >> > Signed-off-by: Darren Hart <dvhart at linux.intel.com>
> > >> > ---
> > >> >  src/efi/gummiboot.c | 5 ++++-
> > >> >  1 file changed, 4 insertions(+), 1 deletion(-)
> > >> >
> > >> > diff --git a/src/efi/gummiboot.c b/src/efi/gummiboot.c
> > >> > index 9f2f31d..32e6f32 100644
> > >> > --- a/src/efi/gummiboot.c
> > >> > +++ b/src/efi/gummiboot.c
> > >> > @@ -2199,7 +2199,10 @@ EFI_STATUS efi_main(EFI_HANDLE image, EFI_SYSTEM_TABLE *sys_table) {
> > >> >          config_entry_add_loader_auto(&config, loaded_image->DeviceHandle, root_dir, loaded_image_path,
> > >> >                                       L"auto-efi-shell", 's', L"EFI Shell", L"\\shellx64.efi");
> > >> >          config_entry_add_loader_auto(&config, loaded_image->DeviceHandle, root_dir, loaded_image_path,
> > >> > -                                     L"auto-efi-default", '\0', L"EFI Default Loader", L"\\EFI\\BOOT\\BOOTX64.EFI");
> > >> > +                                     L"auto-efi-default-64", '\0', L"EFI Default Loader (x64)", L"\\EFI\\BOOT\\BOOTX64.EFI");
> > >> > +        config_entry_add_loader_auto(&config, loaded_image->DeviceHandle, root_dir, loaded_image_path,
> > >> > +                                     L"auto-efi-default-32", '\0', L"EFI Default Loader (ia32)", L"\\EFI\\BOOT\\BOOTIA32.EFI");
> > >> > +
> > >>
> > >> Does it make sense to show both? Can EFI even start the non-native one?
> > >>
> > >> Shouldn't we just look for the "native" one, by composing the string
> > >> at compile time?
> > >
> > > Hrm, good point. In my environment, I only have OR the other, and no
> > > distros currently support IA32 EFI :-) But they should! So, yes, this
> > > should be improved as you say. Should this just be an #ifdef/#else? on
> > > the arch as is done for the ia32 tsc asm read function
> > 
> > MACHINE_TYPE_NAME might just work. It's a define from the build system.
> 
> OK, hoping you can save me some time here. I'm trying something like
> this (I believe the filenames are case insensitive?):
> 
> $ git diff
> diff --git a/src/efi/gummiboot.c b/src/efi/gummiboot.c
> index 32e6f32..edfab72 100644
> --- a/src/efi/gummiboot.c
> +++ b/src/efi/gummiboot.c
> @@ -2196,12 +2196,16 @@ EFI_STATUS efi_main(EFI_HANDLE image, EFI_SYSTEM_TABLE *sys_table) {
>          /* if we find some well-known loaders, add them to the end of the list */
>          config_entry_add_loader_auto(&config, loaded_image->DeviceHandle, root_dir, loaded_image_path,
>                                       L"auto-windows", 'w', L"Windows Boot Manager", L"\\EFI\\Microsoft\\Boot\\bootmgfw.efi");
> +
> +        s = PoolPrint(L"\\shell%s.efi", MACHINE_TYPE_NAME);
>          config_entry_add_loader_auto(&config, loaded_image->DeviceHandle, root_dir, loaded_image_path,
> -                                     L"auto-efi-shell", 's', L"EFI Shell", L"\\shellx64.efi");
> -        config_entry_add_loader_auto(&config, loaded_image->DeviceHandle, root_dir, loaded_image_path,
> -                                     L"auto-efi-default-64", '\0', L"EFI Default Loader (x64)", L"\\EFI\\BOOT\\BOOTX64.EFI");
> +                                     L"auto-efi-shell", 's', L"EFI Shell", s);
> +        FreePool(s);
> +
> +        s = PoolPrint(L"EFI Default Loader", L"\\EFI\\BOOT\\BOOT%s.EFI", MACHINE_TYPE_NAME);
>          config_entry_add_loader_auto(&config, loaded_image->DeviceHandle, root_dir, loaded_image_path,
> -                                     L"auto-efi-default-32", '\0', L"EFI Default Loader (ia32)", L"\\EFI\\BOOT\\BOOTIA32.EFI");
> +                                     L"auto-efi-default", '\0', L"EFI Default Loader", s);
> +        FreePool(s);
>  
>          config_entry_add_osx(&config);
>          efivar_set(L"LoaderEntriesAuto", config.entries_auto, FALSE);
> 
> 
> 
> But the build complains about MACHINE_TYPE_NAME not being defined:
> 
> $ make
> make --no-print-directory all-am
>   CC       src/efi/gummiboot.o
> src/efi/gummiboot.c: In function ‘efi_main’:
> src/efi/gummiboot.c:2200:41: error: ‘MACHINE_TYPE_NAME’ undeclared (first use in this function)
>          s = PoolPrint(L"\\shell%s.efi", MACHINE_TYPE_NAME);
>                                          ^
> src/efi/gummiboot.c:2200:41: note: each undeclared identifier is reported only once for each function it appears in
> make[1]: *** [src/efi/gummiboot.o] Error 1
> make: *** [all] Error 2
> 
> 
> I see it in the gummiboot_CFLAGS, what do I have to do to get that to
> src/efi/gummiboot.c?

Nevermind, found it:

$ git diff
diff --git a/Makefile.am b/Makefile.am
index 5dc9493..dcf4334 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -91,7 +91,8 @@ efi_cflags = \
        -fno-stack-protector \
        -Wsign-compare \
        -mno-sse \
-       -mno-mmx
+       -mno-mmx \
+       -DMACHINE_TYPE_NAME=\"$(MACHINE_TYPE_NAME)\"

Thanks,

-- 
Darren Hart
Intel Open Source Technology Center
Yocto Project - Linux Kernel