linux-kernel - [PATCH 01/11] x86/xip: add XIP_KERNEL and XIP

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Date:	Mon, 23 Mar 2015 00:46:30 -0700
From:	Jim Kukunas <james.t.kukunas@...ux.intel.com>
To:	Linux Kernel <linux-kernel@...r.kernel.org>,
	tom.zanussi@...ux.intel.com
Cc:	Arjan van de Ven <arjan@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...or.com>, tglx@...utronix.de,
	mingo@...hat.com, x86@...nel.org
Subject: [PATCH 01/11] x86/xip: add XIP_KERNEL and XIP_BASE options

The CONFIG_XIP_KERNEL Kconfig option enables eXecute-In-Place
(XIP) support. When XIP_KERNEL is set, XIP_BASE points to the
physical address of the vmlinux ELF file.

Signed-off-by: Jim Kukunas <james.t.kukunas@...ux.intel.com>
---
 arch/x86/Kconfig | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index b7d31ca..f5fa02c 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -294,6 +294,25 @@ config ZONE_DMA
 
 	  If unsure, say Y.
 
+config XIP_KERNEL
+	bool "eXecute-In-Place (XIP) support" if (X86_32 && EXPERT && EMBEDDED)
+	depends on !MODULES && !X86_PAE && !SMP
+	default n
+	help
+	  With this option enabled, the text and any read-only segments of
+	  the kernel are not copied from their initial location to their usual
+	  location in RAM. As a result, when the kernel is located in storage
+	  that is addressable by the CPU, the kernel text and read-only data
+	  segments are never loaded into memory, thereby using less RAM.
+
+	  Only enable this option if you know what you're doing.
+
+config XIP_BASE
+	hex "Physical address of XIP kernel" if XIP_KERNEL
+	default "0xFF800000"
+	help
+	  The physical address for the beginning of the vmlinux file.
+
 config SMP
 	bool "Symmetric multi-processing support"
 	---help---
-- 
2.1.0

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