[RFC,3/7] xen/x86: Add some addresses to the Multiboot header
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Message ID 1499550803-25664-4-git-send-email-daniel.kiper@oracle.com
State New, archived
Headers show

Commit Message

Daniel Kiper July 8, 2017, 9:53 p.m. UTC
In comparison to ELF the PE format is not supported by the Multiboot
protocol. So, if we wish to load xen.efi using this protocol we have
to put header_addr, load_addr, load_end_addr, bss_end_addr and
entry_addr data into Multiboot header.

Signed-off-by: Daniel Kiper <daniel.kiper@oracle.com>
---
 xen/arch/x86/boot/head.S |   13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

Patch
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diff --git a/xen/arch/x86/boot/head.S b/xen/arch/x86/boot/head.S
index 28bbc04..0c603a5 100644
--- a/xen/arch/x86/boot/head.S
+++ b/xen/arch/x86/boot/head.S
@@ -195,13 +195,24 @@  ENTRY(start)
         .align 4
 multiboot1_header_start:       /*** MULTIBOOT1 HEADER ****/
 #define MULTIBOOT_HEADER_FLAGS (MULTIBOOT_HEADER_MODS_ALIGNED | \
-                                MULTIBOOT_HEADER_WANT_MEMORY)
+                                MULTIBOOT_HEADER_WANT_MEMORY | \
+                                MULTIBOOT_HEADER_HAS_ADDR)
         /* Magic number indicating a Multiboot header. */
         .long   MULTIBOOT_HEADER_MAGIC
         /* Flags to bootloader (see Multiboot spec). */
         .long   MULTIBOOT_HEADER_FLAGS
         /* Checksum: must be the negated sum of the first two fields. */
         .long   -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)
+        /* header_addr */
+        .long   sym_offs(multiboot1_header_start)
+        /* load_addr */
+        .long   sym_offs(start)
+        /* load_end_addr */
+        .long   sym_offs(__bss_start)
+        /* bss_end_addr */
+        .long   sym_offs(__2M_rwdata_end)
+        /* entry_addr */
+        .long   sym_offs(__start)
 multiboot1_header_end:
 
 /*** MULTIBOOT2 HEADER ****/