Re: [Xen-devel] [PATCH v2 4/6] multiboot2: Add tags used to pass ImageHandle to loaded image

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Mon, Jul 20, 2015 at 04:35:52PM +0200, Daniel Kiper wrote:
> Add tags used to pass ImageHandle to loaded image. It is used

s/loaded image/loaded image if requested./
> by at least ExitBootServices() function.
> 
> Signed-off-by: Daniel Kiper <daniel.kiper@xxxxxxxxxx>
> ---
>  grub-core/loader/multiboot_mbi2.c |   46 
> +++++++++++++++++++++++++++++--------
>  include/multiboot2.h              |   16 +++++++++++++
>  2 files changed, 53 insertions(+), 9 deletions(-)
> 
> diff --git a/grub-core/loader/multiboot_mbi2.c 
> b/grub-core/loader/multiboot_mbi2.c
> index 8d66e3f..dc9c709 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 +409,18 @@ 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
>      + ALIGN_UP (sizeof (struct multiboot_tag_efi32), MULTIBOOT_TAG_ALIGN)
>      + ALIGN_UP (sizeof (struct multiboot_tag_efi64), MULTIBOOT_TAG_ALIGN)
> +    + ALIGN_UP (sizeof (struct multiboot_tag_efi32_ih), MULTIBOOT_TAG_ALIGN)

Shouldn't they be wrapped with #ifdef __x86_64__ (for efi64_ih) and #ifdef 
__i386__
for the other?

Or two functions (in the header?) wrapped with proper #ifdef machinery?

> +    + ALIGN_UP (sizeof (struct multiboot_tag_efi64_ih), MULTIBOOT_TAG_ALIGN)
> +    + ALIGN_UP (sizeof (struct multiboot_tag_efi_mmap)
> +             + efi_mmap_size, MULTIBOOT_TAG_ALIGN)
> +#endif
>      + 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;
>  }
> @@ -906,11 +910,35 @@ 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 __x86_64__
> +      {
> +     struct multiboot_tag_efi64_ih *tag = (struct multiboot_tag_efi64_ih *) 
> ptrorig;
> +     tag->type = MULTIBOOT_TAG_TYPE_EFI64_IH;
> +     tag->size = sizeof (*tag);

The other places where sizeof is used ends up using the full structure so it :

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
> +
> +#ifdef __i386__
> +      {
> +     struct multiboot_tag_efi32_ih *tag = (struct multiboot_tag_efi32_ih *) 
> ptrorig;
> +     tag->type = MULTIBOOT_TAG_TYPE_EFI32_IH;
> +     tag->size = sizeof (*tag);

Ditto.
> +     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 b3977e3..9f97ddc 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
>  
>  #define MULTIBOOT_HEADER_TAG_END  0
>  #define MULTIBOOT_HEADER_TAG_INFORMATION_REQUEST  1
> @@ -379,6 +381,20 @@ struct multiboot_tag_efi_mmap
>    multiboot_uint8_t efi_mmap[0];
>  }; 
>  
> +struct multiboot_tag_efi32_ih
> +{
> +  multiboot_uint32_t type;
> +  multiboot_uint32_t size;
> +  multiboot_uint32_t pointer;
> +};
> +
> +struct multiboot_tag_efi64_ih
> +{
> +  multiboot_uint32_t type;
> +  multiboot_uint32_t size;
> +  multiboot_uint64_t pointer;
> +};
> +
>  #endif /* ! ASM_FILE */
>  
>  #endif /* ! MULTIBOOT_HEADER */
> -- 
> 1.7.10.4
> 

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