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

[Daniel Kiper <daniel.kiper@xxxxxxxxxx>]

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>
---
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


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