[Xen-devel] [PATCH v2] 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 v1:
        * Updated commit message
        * Removed endianess code
---
 xen/arch/arm/arm64/head.S          | 5 +++--
 xen/arch/arm/arm64/lib/assembler.h | 9 +++++++++
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/xen/arch/arm/arm64/head.S b/xen/arch/arm/arm64/head.S
index d63734f..8e35968 100644
--- a/xen/arch/arm/arm64/head.S
+++ b/xen/arch/arm/arm64/head.S
@@ -25,6 +25,7 @@
 #include <asm/early_printk.h>
 #include <efi/efierr.h>
 #include <asm/arm64/efibind.h>
+#include "lib/assembler.h"
 
 #define PT_PT     0xf7f /* nG=1 AF=1 SH=11 AP=01 NS=1 ATTR=111 T=1 P=1 */
 #define PT_MEM    0xf7d /* nG=1 AF=1 SH=11 AP=01 NS=1 ATTR=111 T=0 P=1 */
@@ -120,8 +121,8 @@ 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   __KERNEL_SIZE        /* Effective size of kernel image, 
little-endian */
+        .quad   __HEAD_FLAGS         /* Informative flags, little-endian */
         .quad   0                    /* reserved */
         .quad   0                    /* reserved */
         .quad   0                    /* reserved */
diff --git a/xen/arch/arm/arm64/lib/assembler.h 
b/xen/arch/arm/arm64/lib/assembler.h
index 3f9c0dc..7239c19 100644
--- a/xen/arch/arm/arm64/lib/assembler.h
+++ b/xen/arch/arm/arm64/lib/assembler.h
@@ -9,4 +9,13 @@
 #define CPU_BE(x...)
 #define CPU_LE(x...) x
 
+#define __HEAD_FLAG_PAGE_SIZE   1 /* 4K hard-coded */
+
+#define __HEAD_FLAG_PHYS_BASE   1
+
+#define __HEAD_FLAGS            ((__HEAD_FLAG_PAGE_SIZE << 1) |  \
+                                (__HEAD_FLAG_PHYS_BASE << 3))
+
+#define __KERNEL_SIZE           (_end - start)
+
 #endif /* __ASM_ASSEMBLER_H__ */
-- 
1.9.1


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