linux-kernel - [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry

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Message-Id: <1436214373-12969-6-git-send-email-pali.rohar@gmail.com>
Date:	Mon,  6 Jul 2015 22:26:13 +0200
From:	Pali Rohár <pali.rohar@...il.com>
To:	Russell King <linux@....linux.org.uk>,
	Laura Abbott <lauraa@...eaurora.org>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robherring2@...il.com>,
	Will Deacon <will.deacon@....com>,
	Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
	Sebastian Reichel <sre@...ian.org>,
	Pavel Machek <pavel@....cz>, Tony Lindgren <tony@...mide.com>,
	Andreas Färber <afaerber@...e.de>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-omap@...r.kernel.org,
	Pali Rohár <pali.rohar@...il.com>
Subject: [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry

Legacy bootloaders can pass additional information for kernel or legacy
userspace applications. When booting DT kernel then ATAGs structure is not
more visible after running kernel uncompress code. This patch stores full
ATAGs structure into DT "/chosen/linux,atags" entry, so kernel can later
reuse it and export via /proc/atags to userspace.

Signed-off-by: Pali Rohár <pali.rohar@...il.com>
---
 arch/arm/boot/compressed/atags_to_fdt.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/arm/boot/compressed/atags_to_fdt.c b/arch/arm/boot/compressed/atags_to_fdt.c
index e7e1cc9..ae93973 100644
--- a/arch/arm/boot/compressed/atags_to_fdt.c
+++ b/arch/arm/boot/compressed/atags_to_fdt.c
@@ -112,7 +112,7 @@ int atags_to_fdt(void *atag_list, void *fdt, int total_space)
 	 * address and size for each bank */
 	uint32_t mem_reg_property[2 * 2 * NR_BANKS];
 	int memcount = 0;
-	int ret, memsize;
+	int ret, memsize, atag_size;
 
 	/* make sure we've got an aligned pointer */
 	if ((u32)atag_list & 0x3)
@@ -189,5 +189,9 @@ int atags_to_fdt(void *atag_list, void *fdt, int total_space)
 			4 * memcount * memsize);
 	}
 
+	/* include the terminating ATAG_NONE */
+	atag_size = (char *)atag - (char *)atag_list + sizeof(struct tag_header);
+	setprop(fdt, "/chosen", "linux,atags", atag_list, atag_size);
+
 	return fdt_pack(fdt);
 }
-- 
1.7.9.5

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