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From: Ahmad Fatoum <>
Cc: Ahmad Fatoum <>
Subject: [PATCH 5/5] sandbox: add dummy memory-mapped I/O port region
Date: Tue, 29 Sep 2020 12:58:23 +0200	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

Super I/O devices on x86 have their base usually located at one of two
I/O ports. They are probed by writing a "passcode" to the I/O port
and then a value is read back.

When COMPILE_TESTing these drivers and running them on sandbox,
this fails with a segfault because all I/O port access lead to
zero page dereference on that architecture. Even without running
barebox, static analyzers correctly flag these accesses as invoking
undefined behavior. Adding a dummy I/O region solves both issues.

Signed-off-by: Ahmad Fatoum <>
 arch/sandbox/board/devices.c  | 3 +++
 arch/sandbox/include/asm/io.h | 6 +++++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/arch/sandbox/board/devices.c b/arch/sandbox/board/devices.c
index 72e62552a3b8..1fd1913ae60f 100644
--- a/arch/sandbox/board/devices.c
+++ b/arch/sandbox/board/devices.c
@@ -9,6 +9,9 @@
 #include <mach/linux.h>
 #include <init.h>
 #include <mach/linux.h>
+#include <asm/io.h>
+unsigned char __pci_iobase[IO_SPACE_LIMIT];
 static LIST_HEAD(sandbox_device_list);
diff --git a/arch/sandbox/include/asm/io.h b/arch/sandbox/include/asm/io.h
index 6a0e77aead42..9f9cd3a42ab1 100644
--- a/arch/sandbox/include/asm/io.h
+++ b/arch/sandbox/include/asm/io.h
@@ -1,7 +1,11 @@
 #ifndef __ASM_SANDBOX_IO_H
 #define __ASM_SANDBOX_IO_H
-#define	IO_SPACE_LIMIT 0
+#define	IO_SPACE_LIMIT 0xffff
+/* pacify static analyzers */
+#define PCI_IOBASE     ((void __iomem *)__pci_iobase)
+extern unsigned char __pci_iobase[IO_SPACE_LIMIT];
 #include <asm-generic/io.h>
 #include <asm-generic/bitio.h>

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  parent reply	other threads:[~2020-09-29 10:58 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-29 10:58 [PATCH 1/5] common: debug_ll: remove reference to undefined Kconfig option Ahmad Fatoum
2020-09-29 10:58 ` [PATCH 2/5] lib: ratp: rename now undefined use of a Kconfig symbol Ahmad Fatoum
2020-09-29 10:58 ` [PATCH 3/5] at91: wdt: don't include <asm-generic/io.h> directly Ahmad Fatoum
2020-09-29 10:58 ` [PATCH 4/5] include: asm-generic: bitio.h " Ahmad Fatoum
2020-09-29 10:58 ` Ahmad Fatoum [this message]
2020-10-01  6:12 ` [PATCH 1/5] common: debug_ll: remove reference to undefined Kconfig option Sascha Hauer

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