From dfed8c4874b4e87d809c8bf64a8f8adc8048915f Mon Sep 17 00:00:00 2001
From: Vincenzo Frascino <vincenzo.frascino@linaro.org>
Date: Mon, 27 Mar 2017 15:52:42 +0100
Subject: [PATCH] kernel: Add stack_info to k_thread

This patck adds the stack information into the k_thread data structure.
The information will be set by when creating a new thread (_new_thread)
and will be used by the scheduling process.

Change-Id: Ibe79fe92a9ef8bce27bf8616d8e0c878508c267d
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@linaro.org>
---
 kernel/Kconfig                  |  8 ++++++++
 kernel/include/kernel_structs.h | 20 ++++++++++++++++++++
 2 files changed, 28 insertions(+)

diff --git a/kernel/Kconfig b/kernel/Kconfig
index d0c16a622b3..03e586bbc46 100644
--- a/kernel/Kconfig
+++ b/kernel/Kconfig
@@ -138,6 +138,14 @@ config ISR_STACK_SIZE
 	This option specifies the size of the stack used by interrupt
 	service routines (ISRs), and during kernel initialization.
 
+config THREAD_STACK_INFO
+	bool
+	prompt "Thread stack info"
+	default n
+	help
+	This option allows each thread to store the thread stack info into
+	the k_thread data structure.
+
 config  THREAD_CUSTOM_DATA
 	bool
 	prompt "Thread custom data"
diff --git a/kernel/include/kernel_structs.h b/kernel/include/kernel_structs.h
index 02bfc4526be..6263b8d612f 100644
--- a/kernel/include/kernel_structs.h
+++ b/kernel/include/kernel_structs.h
@@ -65,6 +65,16 @@ struct __thread_entry {
 };
 #endif
 
+#if defined(CONFIG_THREAD_STACK_INFO)
+/* Contains the stack information of a thread */
+struct _thread_stack_info {
+	/* Stack Start */
+	u32_t start;
+	/* Stack Size */
+	u32_t size;
+};
+#endif /* CONFIG_THREAD_STACK_INFO */
+
 /* can be used for creating 'dummy' threads, e.g. for pending on objects */
 struct _thread_base {
 
@@ -148,6 +158,11 @@ struct k_thread {
 	int errno_var;
 #endif
 
+#if defined(CONFIG_THREAD_STACK_INFO)
+	/* Stack Info */
+	struct _thread_stack_info stack_info;
+#endif /* CONFIG_THREAD_STACK_INFO */
+
 	/* arch-specifics: must always be at the end */
 	struct _thread_arch arch;
 };
@@ -265,6 +280,11 @@ static ALWAYS_INLINE struct k_thread *_new_thread_init(char *pStack,
 	thread->custom_data = NULL;
 #endif
 
+#if defined(CONFIG_THREAD_STACK_INFO)
+	thread->stack_info.start = (u32_t)pStack;
+	thread->stack_info.size = (u32_t)stackSize;
+#endif /* CONFIG_THREAD_STACK_INFO */
+
 	return thread;
 }