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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v2 4/8] xen/x86: add some addresses to the Multiboot header
In comparison to ELF the PE format is not supported by the Multiboot protocol. So, if we wish to load xen.mb.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. The Multiboot protocol spec can be found at https://www.gnu.org/software/grub/manual/multiboot/ Signed-off-by: Daniel Kiper <daniel.kiper@xxxxxxxxxx> --- v2 - suggestions/fixes: - add the pointer to the Multiboot protocol spec to the commit message (suggested by Konrad Rzeszutek Wilk). --- xen/arch/x86/boot/head.S | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/xen/arch/x86/boot/head.S b/xen/arch/x86/boot/head.S index 47f254d..3ed43d9 100644 --- a/xen/arch/x86/boot/head.S +++ b/xen/arch/x86/boot/head.S @@ -201,13 +201,24 @@ ENTRY(start) .balign 4 multiboot1_header: /*** 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) + /* 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) .size multiboot1_header, . - multiboot1_header .type multiboot1_header, @object -- 1.7.10.4 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/mailman/listinfo/xen-devel
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