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From: Sascha Hauer <s.hauer@pengutronix.de>
To: Barebox List <barebox@lists.infradead.org>
Subject: [PATCH v2 1/2] ARM: set zero page accessible before copying ATAGs there
Date: Wed, 31 May 2023 12:35:14 +0200	[thread overview]
Message-ID: <20230531103515.845714-1-s.hauer@pengutronix.de> (raw)

We used skip setting up the zero page as faulting when the SDRAM
starts at 0x0. One reason for doing that was that ATAGs will be copied
there in that case. Call zero_page_access() if necessary to be able
to set the zero page to faulting during barebox startup in the next
step.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 arch/arm/lib32/armlinux.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/arm/lib32/armlinux.c b/arch/arm/lib32/armlinux.c
index 6cb7d4b5f3..eb30f4a952 100644
--- a/arch/arm/lib32/armlinux.c
+++ b/arch/arm/lib32/armlinux.c
@@ -18,6 +18,7 @@
 #include <memory.h>
 #include <of.h>
 #include <magicvar.h>
+#include <zero_page.h>
 
 #include <asm/byteorder.h>
 #include <asm/setup.h>
@@ -265,8 +266,12 @@ void start_linux(void *adr, int swap, unsigned long initrd_address,
 		pr_debug("booting kernel with devicetree\n");
 		params = oftree;
 	} else {
-		setup_tags(initrd_address, initrd_size, swap);
 		params = armlinux_get_bootparams();
+
+		if ((unsigned long)params < PAGE_SIZE)
+			zero_page_access();
+
+		setup_tags(initrd_address, initrd_size, swap);
 	}
 	architecture = armlinux_get_architecture();
 
-- 
2.39.2




             reply	other threads:[~2023-05-31 10:36 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-05-31 10:35 Sascha Hauer [this message]
2023-05-31 10:35 ` [PATCH v2 2/2] ARM: mmu_32: fix setting up zero page when it is in SDRAM Sascha Hauer
2023-05-31 10:45   ` Ahmad Fatoum
2023-05-31 11:21     ` Sascha Hauer
2023-05-31 11:58       ` Ahmad Fatoum
2023-05-31 12:38         ` Sascha Hauer
2023-05-31 12:40           ` Ahmad Fatoum
2023-06-01  6:46             ` Sascha Hauer
2023-06-01  7:00               ` Ahmad Fatoum
2023-05-31 10:40 ` [PATCH v2 1/2] ARM: set zero page accessible before copying ATAGs there Ahmad Fatoum

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