From: Simon Kagstrom <simon.kagstrom@netinsight.net>
To: x86@kernel.org, linux-serial@vger.kernel.org,
linux-kernel@vger.kernel.org
Cc: mingo@redhat.com, tglx@linutronix.de, alan@linux.intel.com,
akpm@linux-foundation.org, hpa@zytor.com
Subject: [PATCH 2/2]: x86 real mode: Set delay port according to kernel config
Date: Wed, 17 Mar 2010 13:30:56 +0100 [thread overview]
Message-ID: <20100317133056.289d8dc7@marrow.netinsight.se> (raw)
In-Reply-To: <20100317132849.7d49939b@marrow.netinsight.se>
Port 0x80 is not safe to use on all x86 boards (see
arch/x86/kernel/io_delay.c), so optionally use 0xed from the kernel
config instead.
Signed-off-by: Simon Kagstrom <simon.kagstrom@netinsight.net>
---
arch/x86/boot/boot.h | 5 +++++
1 files changed, 5 insertions(+), 0 deletions(-)
diff --git a/arch/x86/boot/boot.h b/arch/x86/boot/boot.h
index 98239d2..79880b1 100644
--- a/arch/x86/boot/boot.h
+++ b/arch/x86/boot/boot.h
@@ -73,7 +73,12 @@ static inline u32 inl(u32 port)
static inline void io_delay(void)
{
+#ifdef CONFIG_IO_DELAY_0XED
+ const u16 DELAY_PORT = 0xed;
+#else
const u16 DELAY_PORT = 0x80;
+#endif
+
asm volatile("outb %%al,%0" : : "dN" (DELAY_PORT));
}
--
1.6.0.4
prev parent reply other threads:[~2010-03-17 12:31 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-17 12:28 [PATCH 0/2]: x86: Honor IO_DELAY IO port settings Simon Kagstrom
2010-03-17 12:30 ` [PATCH 1/2]: serial8250: Use native_io_delay on the x86 Simon Kagstrom
2010-03-17 13:01 ` Alan Cox
2010-03-17 14:09 ` Simon Kagstrom
2010-03-17 18:25 ` H. Peter Anvin
2010-03-17 18:36 ` Alan Cox
2010-03-17 18:43 ` H. Peter Anvin
2010-03-17 12:30 ` Simon Kagstrom [this message]
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