linux-kernel - [PATCH v12 07/16] arm64: add image head flag definitions

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Message-Id: <20180724065759.19186-8-takahiro.akashi@linaro.org>
Date:   Tue, 24 Jul 2018 15:57:50 +0900
From:   AKASHI Takahiro <takahiro.akashi@...aro.org>
To:     catalin.marinas@....com, will.deacon@....com, dhowells@...hat.com,
        vgoyal@...hat.com, herbert@...dor.apana.org.au,
        davem@...emloft.net, dyoung@...hat.com, bhe@...hat.com,
        arnd@...db.de, schwidefsky@...ibm.com, heiko.carstens@...ibm.com
Cc:     ard.biesheuvel@...aro.org, james.morse@....com,
        bhsharma@...hat.com, kexec@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        AKASHI Takahiro <takahiro.akashi@...aro.org>
Subject: [PATCH v12 07/16] 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@...aro.org>
Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Will Deacon <will.deacon@....com>
Acked-by: James Morse <james.morse@....com>
---
 arch/arm64/include/asm/boot.h | 15 +++++++++++++++
 arch/arm64/kernel/head.S      |  2 +-
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/include/asm/boot.h b/arch/arm64/include/asm/boot.h
index 355e552a9175..0bab7eed3012 100644
--- a/arch/arm64/include/asm/boot.h
+++ b/arch/arm64/include/asm/boot.h
@@ -5,6 +5,21 @@
 
 #include <asm/sizes.h>
 
+#define ARM64_MAGIC		"ARM\x64"
+
+#define HEAD_FLAG_BE_SHIFT		0
+#define HEAD_FLAG_PAGE_SIZE_SHIFT	1
+#define HEAD_FLAG_BE_MASK		0x1
+#define HEAD_FLAG_PAGE_SIZE_MASK	0x3
+
+#define HEAD_FLAG_BE			1
+#define HEAD_FLAG_PAGE_SIZE_4K		1
+#define HEAD_FLAG_PAGE_SIZE_16K		2
+#define HEAD_FLAG_PAGE_SIZE_64K		3
+
+#define head_flag_field(flags, field) \
+		(((flags) >> field##_SHIFT) & field##_MASK)
+
 /*
  * arm64 requires the DTB to be 8 byte aligned and
  * not exceed 2MB in size.
diff --git a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S
index b0853069702f..8cbac6232ed1 100644
--- a/arch/arm64/kernel/head.S
+++ b/arch/arm64/kernel/head.S
@@ -91,7 +91,7 @@ _head:
 	.quad	0				// reserved
 	.quad	0				// reserved
 	.quad	0				// reserved
-	.ascii	"ARM\x64"			// Magic number
+	.ascii	ARM64_MAGIC			// Magic number
 #ifdef CONFIG_EFI
 	.long	pe_header - _head		// Offset to the PE header.
 
-- 
2.18.0