Module: xenomai-abe
Branch: analogy
Commit: 6fddc692587ab0338872ccc3fdbfcf57e5b7584b
URL:
http://git.xenomai.org/?p=xenomai-abe.git;a=commit;h=6fddc692587ab0338872ccc3fdbfcf57e5b7584b
Author: Philippe Gerum <r...@xenomai.org>
Date: Sat Oct 24 16:11:38 2009 +0200
blackfin: introduce MPU support
---
include/asm-blackfin/bits/pod.h | 57 +++++++++++++++++++++++++++++++++++++-
include/asm-blackfin/system.h | 3 ++
2 files changed, 58 insertions(+), 2 deletions(-)
diff --git a/include/asm-blackfin/bits/pod.h b/include/asm-blackfin/bits/pod.h
index a8eecb4..a77ac7e 100644
--- a/include/asm-blackfin/bits/pod.h
+++ b/include/asm-blackfin/bits/pod.h
@@ -59,12 +59,65 @@ static inline void xnarch_enter_root(xnarchtcb_t * rootcb)
{
}
+#ifdef CONFIG_MPU
+
+static inline
+struct task_struct *mpu_get_prev(struct xnarchtcb *tcb)
+{
+ return tcb->active_task;
+}
+
+static inline
+void mpu_set_next(struct xnarchtcb *tcb,
+ struct task_struct *next)
+{
+ tcb->active_task = next;
+}
+
+static inline void mpu_switch(struct task_struct *prev,
+ struct task_struct *next)
+{
+ if (next && next != prev) {
+ struct mm_struct *oldmm = prev->active_mm;
+ switch_mm(oldmm, next->active_mm, next);
+ }
+}
+
+#else /* !CONFIG_MPU */
+
+static inline
+struct task_struct *mpu_get_prev(struct xnarchtcb *tcb)
+{
+ return NULL;
+}
+
+static inline
+void mpu_set_next(struct xnarchtcb *tcb,
+ struct task_struct *next)
+{
+}
+
+static inline void mpu_switch(struct task_struct *prev,
+ struct task_struct *next)
+{
+}
+
+#endif /* CONFIG_MPU */
+
static inline void xnarch_switch_to(xnarchtcb_t * out_tcb, xnarchtcb_t *
in_tcb)
{
- if (in_tcb->user_task)
+ struct task_struct *prev = mpu_get_prev(out_tcb);
+ struct task_struct *next = in_tcb->user_task;
+
+ if (likely(next != NULL)) {
+ mpu_set_next(in_tcb, next);
rthal_clear_foreign_stack(&rthal_domain);
- else
+ } else {
+ mpu_set_next(in_tcb, prev);
rthal_set_foreign_stack(&rthal_domain);
+ }
+
+ mpu_switch(prev, next);
rthal_thread_switch(out_tcb->tsp, in_tcb->tsp);
}
diff --git a/include/asm-blackfin/system.h b/include/asm-blackfin/system.h
index 1f87c9b..f7a46b2 100644
--- a/include/asm-blackfin/system.h
+++ b/include/asm-blackfin/system.h
@@ -49,6 +49,9 @@ typedef struct xnarchtcb { /* Per-thread arch-dependent
block */
struct thread_struct ts; /* Holds kernel-based thread context. */
struct task_struct *user_task; /* Shadowed user-space task */
+#ifdef CONFIG_MPU
+ struct task_struct *active_task; /* Active user-space task */
+#endif
struct thread_struct *tsp; /* Pointer to the active thread struct (&ts or
&user->thread). */
/* Init block */
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