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-rw-r--r--payloads/libpayload/arch/x86/multiboot_header.inc54
1 files changed, 54 insertions, 0 deletions
diff --git a/payloads/libpayload/arch/x86/multiboot_header.inc b/payloads/libpayload/arch/x86/multiboot_header.inc
new file mode 100644
index 0000000000..e321dc42b2
--- /dev/null
+++ b/payloads/libpayload/arch/x86/multiboot_header.inc
@@ -0,0 +1,54 @@
+/*
+ *
+ * Copyright (C) 2008 Advanced Micro Devices, Inc.
+ * Copyright (C) 2017 Patrick Rudolph <siro@das-labor.org>
+ * Copyright (C) 2024 Google Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#define MB_MAGIC 0x1BADB002
+#define MB_FLAGS 0x00010003
+
+ jmp _init
+
+/*
+ * Note: The Multiboot standard requires Multiboot header to be placed
+ * below 0x2000 in the resulting image. See:
+ * http://www.gnu.org/software/grub/manual/multiboot/html_node/OS-image-format.html
+ */
+mb_header:
+ .long MB_MAGIC
+ .long MB_FLAGS
+ .long -(MB_MAGIC + MB_FLAGS)
+ .long mb_header
+ .long _start
+ .long _edata
+ .long _end
+ .long _init
+
+_init:
+ /* Store EAX and EBX */
+ movl %eax, loader_eax
+ movl %ebx, loader_ebx