linux-kernel - [PATCH 2/2]: x86 real mode: Set delay port according to kernel config

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Message-ID: <20100317133056.289d8dc7@marrow.netinsight.se>
Date:	Wed, 17 Mar 2010 13:30:56 +0100
From:	Simon Kagstrom <simon.kagstrom@...insight.net>
To:	x86@...nel.org, linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc:	mingo@...hat.com, tglx@...utronix.de, alan@...ux.intel.com,
	akpm@...ux-foundation.org, hpa@...or.com
Subject: [PATCH 2/2]: x86 real mode: Set delay port according to kernel
 config

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@...insight.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

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