Re: [GRUB2 PATCH v4 2/4] multiboot2: Add tags used to pass ImageHandle to loaded image

From: "Vladimir 'phcoder' Serbinenko" <phcoder@gmail.com>
To: Daniel Kiper <daniel.kiper@oracle.com>
Cc: "jgross@suse.com" <jgross@suse.com>,
	"grub-devel@gnu.org" <grub-devel@gnu.org>,
	"eric.snowberg@oracle.com" <eric.snowberg@oracle.com>,
	"arvidjaar@gmail.com" <arvidjaar@gmail.com>,
	"andrew.cooper3@citrix.com" <andrew.cooper3@citrix.com>,
	"cardoe@cardoe.com" <cardoe@cardoe.com>,
	"pgnet.dev@gmail.com" <pgnet.dev@gmail.com>,
	"roy.franz@linaro.org" <roy.franz@linaro.org>,
	"ning.sun@intel.com" <ning.sun@intel.com>,
	"david.vrabel@citrix.com" <david.vrabel@citrix.com>,
	"jbeulich@suse.com" <jbeulich@suse.com>,
	"stefano.stabellini@eu.citrix.com"
	<stefano.stabellini@eu.citrix.com>,
	"xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>,
	"qiaowei.ren@intel.com" <qiaowei.ren@intel.com>,
	"richard.l.maliszewski@intel.com"
	<richard.l.maliszewski@intel.com>,
	"gang.wei@intel.com" <gang.wei@intel.com>,
	"fu.wei@linaro.org" <fu.wei@linaro.org>,
	"seth.goldberg@oracle.com" <seth>
Subject: Re: [GRUB2 PATCH v4 2/4] multiboot2: Add tags used to pass ImageHandle to loaded image
Date: Tue, 15 Mar 2016 17:03:01 +0100	[thread overview]
Message-ID: <CAEaD8JNf5jhF_He-ic7z0NQcL+xEX7dPAt06NQVorMcY=PguKA__10276.3008595959$1458057824$gmane$org@mail.gmail.com> (raw)
In-Reply-To: <1458055562-24950-3-git-send-email-daniel.kiper@oracle.com>

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Looks good. Let's give others a day to comment before committing

On Tuesday, March 15, 2016, Daniel Kiper <daniel.kiper@oracle.com> 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@oracle.com <javascript:;>>
> ---
> v4 - suggestions/fixes:
>    - reduce number of #ifdefs in grub_multiboot_get_mbi_size()
>      (suggested by Vladimir 'phcoder' Serbinenko).
>
> 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 |   42
> ++++++++++++++++++++++++++++++-------
>  include/multiboot2.h              |   16 ++++++++++++++
>  2 files changed, 51 insertions(+), 7 deletions(-)
>
> diff --git a/grub-core/loader/multiboot_mbi2.c
> b/grub-core/loader/multiboot_mbi2.c
> index a3dca90..6c04402 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:
> @@ -407,13 +409,15 @@ 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)
> -    + 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_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_efi32), MULTIBOOT_TAG_ALIGN)
> +    + ALIGN_UP (sizeof (struct multiboot_tag_efi32_ih),
> MULTIBOOT_TAG_ALIGN)
> +    + ALIGN_UP (sizeof (struct multiboot_tag_efi64), MULTIBOOT_TAG_ALIGN)
> +    + 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
> @@ -907,11 +911,35 @@ 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 46e7b71..f5bebe1 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
> @@ -371,6 +373,20 @@ 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
>
>

-- 
Regards
Vladimir 'phcoder' Serbinenko

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