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arm64: add image head flag definitions 

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>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
AKASHI Takahiro 2018-11-15 14:52:46 +09:00 committed by Will Deacon
parent 497e185864
commit f56063c51f
3 changed files with 74 additions and 9 deletions
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59
arch/arm64/include/asm/image.h Normal file
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@ -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 */

3
arch/arm64/kernel/head.S
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@ -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.

21
arch/arm64/kernel/image.h
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@ -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 */