Re: [Xen-devel] [GRUB2 PATCH v3 2/4] multiboot2: Add tags used to pass ImageHandle to loaded image

[Daniel Kiper <daniel.kiper@xxxxxxxxxx>]

On Thu, Mar 10, 2016 at 09:26:06PM +0100, Vladimir 'phcoder' Serbinenko wrote:
> On Wednesday, March 2, 2016, Daniel Kiper <daniel.kiper@xxxxxxxxxx> wrote:
>
> > Add tags used to pass ImageHandle to loaded image if requested.
> > It is used by at least ExitBootServices() function.
> >
> > Signed-off-by: Daniel Kiper <daniel.kiper@xxxxxxxxxx <javascript:;>>
> > ---
> > v3 - suggestions/fixes:
> >    - mbi EFI related stuff size calculation
> >      should depend on target architecture
> >      (suggested by Konrad Rzeszutek Wilk),
> >    - use plain type instead of pointer
> >      dereference as sizeof() argument
> >      (suggested by Konrad Rzeszutek Wilk),
> >    - improve commit message
> >      (suggested by Konrad Rzeszutek Wilk).
> > ---
> >  grub-core/loader/multiboot_mbi2.c |   50
> > ++++++++++++++++++++++++++++++-------
> >  include/multiboot2.h              |   16 ++++++++++++
> >  2 files changed, 57 insertions(+), 9 deletions(-)
> >
> > diff --git a/grub-core/loader/multiboot_mbi2.c
> > b/grub-core/loader/multiboot_mbi2.c
> > index a3dca90..7591edc 100644
> > --- a/grub-core/loader/multiboot_mbi2.c
> > +++ b/grub-core/loader/multiboot_mbi2.c
> > @@ -172,6 +172,8 @@ grub_multiboot_load (grub_file_t file, const char
> > *filename)
> >               case MULTIBOOT_TAG_TYPE_NETWORK:
> >               case MULTIBOOT_TAG_TYPE_EFI_MMAP:
> >               case MULTIBOOT_TAG_TYPE_EFI_BS:
> > +             case MULTIBOOT_TAG_TYPE_EFI32_IH:
> > +             case MULTIBOOT_TAG_TYPE_EFI64_IH:
> >                 break;
> >
> >               default:
> > @@ -407,16 +409,22 @@ grub_multiboot_get_mbi_size (void)
> >                  + grub_get_multiboot_mmap_count ()
> >                  * sizeof (struct multiboot_mmap_entry)),
> > MULTIBOOT_TAG_ALIGN)
> >      + ALIGN_UP (sizeof (struct multiboot_tag_framebuffer),
> > MULTIBOOT_TAG_ALIGN)
> > +#ifdef GRUB_MACHINE_EFI
> > +#ifdef __i386__
> >      + ALIGN_UP (sizeof (struct multiboot_tag_efi32), MULTIBOOT_TAG_ALIGN)
> > +    + ALIGN_UP (sizeof (struct multiboot_tag_efi32_ih),
> > MULTIBOOT_TAG_ALIGN)
> > +#endif
> > +#ifdef __x86_64__
> >      + ALIGN_UP (sizeof (struct multiboot_tag_efi64), MULTIBOOT_TAG_ALIGN)
> > +    + ALIGN_UP (sizeof (struct multiboot_tag_efi64_ih),
> > MULTIBOOT_TAG_ALIGN)
> > +#endif
> > +    + ALIGN_UP (sizeof (struct multiboot_tag_efi_mmap)
> > +               + efi_mmap_size, MULTIBOOT_TAG_ALIGN)
> > +#endif
> >
> It doesn't need to be exact. It's just an upper bound. Feel free to
> simplify knowing this, removing few #ifdef.

OK.

> >      + ALIGN_UP (sizeof (struct multiboot_tag_old_acpi)
> >                 + sizeof (struct grub_acpi_rsdp_v10), MULTIBOOT_TAG_ALIGN)
> >      + acpiv2_size ()
> >      + net_size ()
> > -#ifdef GRUB_MACHINE_EFI
> > -    + ALIGN_UP (sizeof (struct multiboot_tag_efi_mmap)
> > -               + efi_mmap_size, MULTIBOOT_TAG_ALIGN)
> > -#endif
> >      + sizeof (struct multiboot_tag_vbe) + MULTIBOOT_TAG_ALIGN - 1
> >      + sizeof (struct multiboot_tag_apm) + MULTIBOOT_TAG_ALIGN - 1;
> >  }
> > @@ -907,11 +915,35 @@ grub_multiboot_make_mbi (grub_uint32_t *target)
> >
> >    if (keep_bs)
> >      {
> > -      struct multiboot_tag *tag = (struct multiboot_tag *) ptrorig;
> > -      tag->type = MULTIBOOT_TAG_TYPE_EFI_BS;
> > -      tag->size = sizeof (struct multiboot_tag);
> > -      ptrorig += ALIGN_UP (tag->size, MULTIBOOT_TAG_ALIGN)
> > -       / sizeof (grub_properly_aligned_t);
> > +      {
> > +       struct multiboot_tag *tag = (struct multiboot_tag *) ptrorig;
> > +       tag->type = MULTIBOOT_TAG_TYPE_EFI_BS;
> > +       tag->size = sizeof (struct multiboot_tag);
> > +       ptrorig += ALIGN_UP (tag->size, MULTIBOOT_TAG_ALIGN)
> > +         / sizeof (grub_properly_aligned_t);
> > +      }
> > +
> > +#ifdef __i386__
> > +      {
> > +       struct multiboot_tag_efi32_ih *tag = (struct
> > multiboot_tag_efi32_ih *) ptrorig;
> > +       tag->type = MULTIBOOT_TAG_TYPE_EFI32_IH;
> > +       tag->size = sizeof (struct multiboot_tag_efi32_ih);
> > +       tag->pointer = (grub_addr_t) grub_efi_image_handle;
> > +       ptrorig += ALIGN_UP (tag->size, MULTIBOOT_TAG_ALIGN)
> > +         / sizeof (grub_properly_aligned_t);
> > +      }
> > +#endif
> > +
> > +#ifdef __x86_64__
> > +      {
> > +       struct multiboot_tag_efi64_ih *tag = (struct
> > multiboot_tag_efi64_ih *) ptrorig;
> > +       tag->type = MULTIBOOT_TAG_TYPE_EFI64_IH;
> > +       tag->size = sizeof (struct multiboot_tag_efi64_ih);
> > +       tag->pointer = (grub_addr_t) grub_efi_image_handle;
> > +       ptrorig += ALIGN_UP (tag->size, MULTIBOOT_TAG_ALIGN)
> > +         / sizeof (grub_properly_aligned_t);
> > +      }
> > +#endif
> >      }
> >  #endif
> >
> > diff --git a/include/multiboot2.h b/include/multiboot2.h
> > index d96aa40..36a174f 100644
> > --- a/include/multiboot2.h
> > +++ b/include/multiboot2.h
> > @@ -60,6 +60,8 @@
> >  #define MULTIBOOT_TAG_TYPE_NETWORK           16
> >  #define MULTIBOOT_TAG_TYPE_EFI_MMAP          17
> >  #define MULTIBOOT_TAG_TYPE_EFI_BS            18
> > +#define MULTIBOOT_TAG_TYPE_EFI32_IH          19
> > +#define MULTIBOOT_TAG_TYPE_EFI64_IH          20
> >
> Is there a followup to define those in texi doc as well?

No problem. Which one should I update?

Daniel

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