[Xen-devel] [PATCH v3] xen:arm: Populate arm64 image header

[Amit Singh Tomar <amittomer25@xxxxxxxxx>]

This patch adds image size and flags to XEN image header. It uses
those fields according to the updated Linux kernel image definition.

With this patch bootloader can now place XEN image anywhere in system
RAM at 2MB aligned address without to worry about relocation.
For instance, it fixes the XEN boot on Amlogic SoC where bootloader(U-BOOT)
always relocates the XEN image to an address range reserved for firmware data.

Signed-off-by: Amit Singh Tomar <amittomer25@xxxxxxxxx>
---
Changes since v2:
        * Undo changes in assembler.h(as suggested by Andre)
Changes since v1:
        * Updated commit message
        * Removed endianess code
---
 xen/arch/arm/arm64/head.S | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/xen/arch/arm/arm64/head.S b/xen/arch/arm/arm64/head.S
index d63734f..ef87b5c 100644
--- a/xen/arch/arm/arm64/head.S
+++ b/xen/arch/arm/arm64/head.S
@@ -32,6 +32,13 @@
 #define PT_DEV    0xe71 /* nG=1 AF=1 SH=10 AP=01 NS=1 ATTR=100 T=0 P=1 */
 #define PT_DEV_L3 0xe73 /* nG=1 AF=1 SH=10 AP=01 NS=1 ATTR=100 T=1 P=1 */
 
+#define __HEAD_FLAG_PAGE_SIZE   ((PAGE_SHIFT - 10) / 2)
+
+#define __HEAD_FLAG_PHYS_BASE   1
+
+#define __HEAD_FLAGS            ((__HEAD_FLAG_PAGE_SIZE << 1) | \
+                                 (__HEAD_FLAG_PHYS_BASE << 3))
+
 #if (defined (CONFIG_EARLY_PRINTK)) && (defined (EARLY_PRINTK_INC))
 #include EARLY_PRINTK_INC
 #endif
@@ -120,8 +127,8 @@ efi_head:
         add     x13, x18, #0x16
         b       real_start           /* branch to kernel start */
         .quad   0                    /* Image load offset from start of RAM */
-        .quad   0                    /* reserved */
-        .quad   0                    /* reserved */
+        .quad   _end - start         /* Effective size of kernel image, 
little-endian */
+        .quad   __HEAD_FLAGS         /* Informative flags, little-endian */
         .quad   0                    /* reserved */
         .quad   0                    /* reserved */
         .quad   0                    /* reserved */
-- 
1.9.1


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