From 8797a9cd1fe6723db34b0c125d0d9d04e3483e8d Mon Sep 17 00:00:00 2001
From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Date: Sat, 17 Sep 2011 22:22:58 +0200
Subject: Add support for the RTAI real-time extension

[Peter: fix rtai Config.in]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
---
 linux/Config.ext.in     | 13 +++++++++++++
 linux/linux-ext-rtai.mk | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 60 insertions(+)
 create mode 100644 linux/linux-ext-rtai.mk

(limited to 'linux')

diff --git a/linux/Config.ext.in b/linux/Config.ext.in
index 893edb58b..8a9f87ec4 100644
--- a/linux/Config.ext.in
+++ b/linux/Config.ext.in
@@ -15,4 +15,17 @@ config BR2_LINUX_KERNEL_EXT_XENOMAI_ADEOS_PATCH
 	  Download it at http://download.gna.org/adeos/patches/v2.6/$(ARCH)/
 	  and verify that your kernel version in buildroot matches.
 
+# RTAI
+config BR2_LINUX_KERNEL_EXT_RTAI
+       bool "RTAI Real-time patch"
+       select BR2_PACKAGE_RTAI
+       help
+         RTAI Kernel part.
+
+config BR2_LINUX_KERNEL_EXT_RTAI_PATCH
+       depends on BR2_LINUX_KERNEL_EXT_RTAI
+       string "Path for RTAI patch file"
+       help
+         Optionally, explicitly specify the RTAI patch to use.
+
 endmenu
diff --git a/linux/linux-ext-rtai.mk b/linux/linux-ext-rtai.mk
new file mode 100644
index 000000000..a54230d32
--- /dev/null
+++ b/linux/linux-ext-rtai.mk
@@ -0,0 +1,47 @@
+##################################################
+# Linux RTAI extensions
+#
+# Patch the linux kernel with RTAI extension
+##################################################
+
+ifeq ($(BR2_LINUX_KERNEL_EXT_RTAI),y)
+# Add dependency to RTAI (user-space) which provide kernel patches
+LINUX_DEPENDENCIES += rtai-patch
+
+RTAI_PATCH = $(call qstrip,$(BR2_LINUX_KERNEL_EXT_RTAI_PATCH))
+
+ifeq ($(KERNEL_ARCH),i386)
+RTAI_ARCH = x86
+else ifeq ($(KERNEL_ARCH),x86_64)
+RTAI_ARCH = x86
+else ifeq ($(KERNEL_ARCH),powerpc)
+RTAI_ARCH = ppc
+else
+RTAI_ARCH = $(KERNEL_ARCH)
+endif
+
+# Prepare kernel patch
+ifeq ($(RTAI_PATCH),)
+define RTAI_PREPARE_KERNEL
+	kver=`$(MAKE) $(LINUX_MAKE_FLAGS) -C $(LINUX_DIR) --no-print-directory -s kernelversion` ; \
+	if test -f $(RTAI_DIR)/base/arch/$(RTAI_ARCH)/patches/hal-linux-$${kver}-*patch ; then \
+		support/script/apply-patches.sh $(LINUX_DIR) 		\
+			$(RTAI_DIR)/base/arch/$(RTAI_ARCH)/patches/ 	\
+			hal-linux-$${kver}-*patch ; \
+	else \
+		echo "No RTAI patch for your kernel version" ; \
+		exit 1 ; \
+	fi
+endef
+else
+define RTAI_PREPARE_KERNEL
+	support/script/apply-patches.sh 	\
+		$(LINUX_DIR)			\
+		$(dir $(RTAI_PATCH))		\
+		$(notdir $(RTAI_PATCH))
+endef
+endif
+
+LINUX_POST_PATCH_HOOKS += RTAI_PREPARE_KERNEL
+
+endif #BR2_LINUX_EXT_RTAI
-- 
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