[PATCH RFC 1/7] xen/x86: Add mbd.h header file

[Daniel Kiper <daniel.kiper@oracle.com>]

Define MultiBoot Data (MBD) type. It is used to define variable
which carry over data from multiboot protocol (any version) through
Xen preloader stage. Later all or parts of this data is used
to initialize Xen Boot Info (XBI) structure. XBI is defined
in next patch.

MBD helps to break multiboot (v1) protocol dependency. Using it
we are able to save space on trampoline (we do not allocate space
for unused data what happens in current preloader implementation).
Additionally, we are able to easily add new members to MBD if we
want support new features or protocols.

Signed-off-by: Daniel Kiper <daniel.kiper@oracle.com>
---
 xen/include/asm-x86/mbd.h |   70 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 xen/include/asm-x86/mbd.h

diff --git a/xen/include/asm-x86/mbd.h b/xen/include/asm-x86/mbd.h
new file mode 100644
index 0000000..5c20e76
--- /dev/null
+++ b/xen/include/asm-x86/mbd.h
@@ -0,0 +1,70 @@
+/*
+ * Copyright (c) 2013, 2014 Oracle Co., Daniel Kiper
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __MBD_H__
+#define __MBD_H__
+
+/* Module type. */
+typedef struct {
+    u32 start;
+    u32 end;
+
+    /* Pointer to a module command line. */
+    u32 cmdline;
+
+    /* If relocated != 0 then a given module was relocated. */
+    u32 relocated;
+} boot_module_t;
+
+/*
+ * MultiBoot Data (MBD) type. It is used to define variable which
+ * carry over data from multiboot protocol (any version) through
+ * Xen preloader stage. Later all or parts of this data is used
+ * to initialize Xen Boot Info (XBI) structure.
+ */
+typedef struct {
+    /* Pointer to boot loader name. */
+    u32 boot_loader_name;
+
+    /* Pointer to Xen command line. */
+    u32 cmdline;
+
+    /*
+     * Amount of lower memory (in KiB) accordingly to The Multiboot
+     * Specification version 0.6.96.
+     */
+    u32 mem_lower;
+
+    /*
+     * Amount of upper memory (in KiB) accordingly to The Multiboot
+     * Specification version 0.6.96.
+     */
+    u32 mem_upper;
+
+    /* Size (in bytes) of memory map provided by bootloader. */
+    u32 mmap_size;
+
+    /* Pointer to memory map provided by bootloader. */
+    u32 mmap;
+
+    /* Number of modules. */
+    u32 mods_nr;
+
+    /* Pointer to modules description (boot_module_t *). */
+    u32 mods;
+} mbd_t;
+#endif /* __MBD_H__ */
-- 
1.7.10.4