lkml.org 
[lkml]   [2018]   [Nov]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v16 07/16] arm64: add image head flag definitions
Date
Those image head's flags will be used later by kexec_file loader.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Acked-by: James Morse <james.morse@arm.com>
---
arch/arm64/include/asm/image.h | 59 ++++++++++++++++++++++++++++++++++
arch/arm64/kernel/head.S | 3 +-
arch/arm64/kernel/image.h | 21 +++++++-----
3 files changed, 74 insertions(+), 9 deletions(-)
create mode 100644 arch/arm64/include/asm/image.h

diff --git a/arch/arm64/include/asm/image.h b/arch/arm64/include/asm/image.h
new file mode 100644
index 000000000000..e2c27a2278e9
--- /dev/null
+++ b/arch/arm64/include/asm/image.h
@@ -0,0 +1,59 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __ASM_IMAGE_H
+#define __ASM_IMAGE_H
+
+#define ARM64_IMAGE_MAGIC "ARM\x64"
+
+#define ARM64_IMAGE_FLAG_BE_SHIFT 0
+#define ARM64_IMAGE_FLAG_PAGE_SIZE_SHIFT (ARM64_IMAGE_FLAG_BE_SHIFT + 1)
+#define ARM64_IMAGE_FLAG_PHYS_BASE_SHIFT \
+ (ARM64_IMAGE_FLAG_PAGE_SIZE_SHIFT + 2)
+#define ARM64_IMAGE_FLAG_BE_MASK 0x1
+#define ARM64_IMAGE_FLAG_PAGE_SIZE_MASK 0x3
+#define ARM64_IMAGE_FLAG_PHYS_BASE_MASK 0x1
+
+#define ARM64_IMAGE_FLAG_LE 0
+#define ARM64_IMAGE_FLAG_BE 1
+#define ARM64_IMAGE_FLAG_PAGE_SIZE_4K 1
+#define ARM64_IMAGE_FLAG_PAGE_SIZE_16K 2
+#define ARM64_IMAGE_FLAG_PAGE_SIZE_64K 3
+#define ARM64_IMAGE_FLAG_PHYS_BASE 1
+
+#ifndef __ASSEMBLY__
+
+#define arm64_image_flag_field(flags, field) \
+ (((flags) >> field##_SHIFT) & field##_MASK)
+
+/*
+ * struct arm64_image_header - arm64 kernel image header
+ * See Documentation/arm64/booting.txt for details
+ *
+ * @code0: Executable code, or
+ * @mz_header alternatively used for part of MZ header
+ * @code1: Executable code
+ * @text_offset: Image load offset
+ * @image_size: Effective Image size
+ * @flags: kernel flags
+ * @reserved: reserved
+ * @magic: Magic number
+ * @reserved5: reserved, or
+ * @pe_header: alternatively used for PE COFF offset
+ */
+
+struct arm64_image_header {
+ __le32 code0;
+ __le32 code1;
+ __le64 text_offset;
+ __le64 image_size;
+ __le64 flags;
+ __le64 res2;
+ __le64 res3;
+ __le64 res4;
+ __le32 magic;
+ __le32 res5;
+};
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* __ASM_IMAGE_H */
diff --git a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S
index 4471f570a295..4d0b78c95c34 100644
--- a/arch/arm64/kernel/head.S
+++ b/arch/arm64/kernel/head.S
@@ -31,6 +31,7 @@
#include <asm/cache.h>
#include <asm/cputype.h>
#include <asm/elf.h>
+#include <asm/image.h>
#include <asm/kernel-pgtable.h>
#include <asm/kvm_arm.h>
#include <asm/memory.h>
@@ -91,7 +92,7 @@ _head:
.quad 0 // reserved
.quad 0 // reserved
.quad 0 // reserved
- .ascii "ARM\x64" // Magic number
+ .ascii ARM64_IMAGE_MAGIC // Magic number
#ifdef CONFIG_EFI
.long pe_header - _head // Offset to the PE header.

diff --git a/arch/arm64/kernel/image.h b/arch/arm64/kernel/image.h
index a820ed07fb80..d843f9cbcd92 100644
--- a/arch/arm64/kernel/image.h
+++ b/arch/arm64/kernel/image.h
@@ -15,13 +15,15 @@
* 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 __ASM_IMAGE_H
-#define __ASM_IMAGE_H
+#ifndef __ARM64_KERNEL_IMAGE_H
+#define __ARM64_KERNEL_IMAGE_H

#ifndef LINKER_SCRIPT
#error This file should only be included in vmlinux.lds.S
#endif

+#include <asm/image.h>
+
/*
* There aren't any ELF relocations we can use to endian-swap values known only
* at link time (e.g. the subtraction of two symbol addresses), so we must get
@@ -47,19 +49,22 @@
sym##_lo32 = DATA_LE32((data) & 0xffffffff); \
sym##_hi32 = DATA_LE32((data) >> 32)

+#define __HEAD_FLAG(field) (__HEAD_FLAG_##field << \
+ ARM64_IMAGE_FLAG_##field##_SHIFT)
+
#ifdef CONFIG_CPU_BIG_ENDIAN
-#define __HEAD_FLAG_BE 1
+#define __HEAD_FLAG_BE ARM64_IMAGE_FLAG_BE
#else
-#define __HEAD_FLAG_BE 0
+#define __HEAD_FLAG_BE ARM64_IMAGE_FLAG_LE
#endif

#define __HEAD_FLAG_PAGE_SIZE ((PAGE_SHIFT - 10) / 2)

#define __HEAD_FLAG_PHYS_BASE 1

-#define __HEAD_FLAGS ((__HEAD_FLAG_BE << 0) | \
- (__HEAD_FLAG_PAGE_SIZE << 1) | \
- (__HEAD_FLAG_PHYS_BASE << 3))
+#define __HEAD_FLAGS (__HEAD_FLAG(BE) | \
+ __HEAD_FLAG(PAGE_SIZE) | \
+ __HEAD_FLAG(PHYS_BASE))

/*
* These will output as part of the Image header, which should be little-endian
@@ -119,4 +124,4 @@ __efistub_screen_info = KALLSYMS_HIDE(screen_info);

#endif

-#endif /* __ASM_IMAGE_H */
+#endif /* __ARM64_KERNEL_IMAGE_H */
--
2.19.0
\
 
 \ /
  Last update: 2018-11-15 06:53    [W:0.090 / U:29.600 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site