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* [PATCH v2 1/2] ARM: set zero page accessible before copying ATAGs there
@ 2023-05-31 10:35 Sascha Hauer
  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 10:40 ` [PATCH v2 1/2] ARM: set zero page accessible before copying ATAGs there Ahmad Fatoum
  0 siblings, 2 replies; 10+ messages in thread
From: Sascha Hauer @ 2023-05-31 10:35 UTC (permalink / raw)
  To: Barebox List

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




^ permalink raw reply	[flat|nested] 10+ messages in thread

end of thread, other threads:[~2023-06-01  7:01 UTC | newest]

Thread overview: 10+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-05-31 10:35 [PATCH v2 1/2] ARM: set zero page accessible before copying ATAGs there Sascha Hauer
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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