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Diffstat (limited to 'arch/mn10300/include/asm/mmu_context.h')
-rw-r--r--arch/mn10300/include/asm/mmu_context.h73
1 files changed, 48 insertions, 25 deletions
diff --git a/arch/mn10300/include/asm/mmu_context.h b/arch/mn10300/include/asm/mmu_context.h
index cb294c2..c8f6c82 100644
--- a/arch/mn10300/include/asm/mmu_context.h
+++ b/arch/mn10300/include/asm/mmu_context.h
@@ -27,28 +27,38 @@
#include <asm/tlbflush.h>
#include <asm-generic/mm_hooks.h>
+#define MMU_CONTEXT_TLBPID_NR 256
#define MMU_CONTEXT_TLBPID_MASK 0x000000ffUL
#define MMU_CONTEXT_VERSION_MASK 0xffffff00UL
#define MMU_CONTEXT_FIRST_VERSION 0x00000100UL
#define MMU_NO_CONTEXT 0x00000000UL
-
-extern unsigned long mmu_context_cache[NR_CPUS];
-#define mm_context(mm) (mm->context.tlbpid[smp_processor_id()])
+#define MMU_CONTEXT_TLBPID_LOCK_NR 0
#define enter_lazy_tlb(mm, tsk) do {} while (0)
+static inline void cpu_ran_vm(int cpu, struct mm_struct *mm)
+{
#ifdef CONFIG_SMP
-#define cpu_ran_vm(cpu, mm) \
- cpumask_set_cpu((cpu), mm_cpumask(mm))
-#define cpu_maybe_ran_vm(cpu, mm) \
- cpumask_test_and_set_cpu((cpu), mm_cpumask(mm))
+ cpumask_set_cpu(cpu, mm_cpumask(mm));
+#endif
+}
+
+static inline bool cpu_maybe_ran_vm(int cpu, struct mm_struct *mm)
+{
+#ifdef CONFIG_SMP
+ return cpumask_test_and_set_cpu(cpu, mm_cpumask(mm));
#else
-#define cpu_ran_vm(cpu, mm) do {} while (0)
-#define cpu_maybe_ran_vm(cpu, mm) true
-#endif /* CONFIG_SMP */
+ return true;
+#endif
+}
-/*
- * allocate an MMU context
+#ifdef CONFIG_MN10300_TLB_USE_PIDR
+extern unsigned long mmu_context_cache[NR_CPUS];
+#define mm_context(mm) (mm->context.tlbpid[smp_processor_id()])
+
+/**
+ * allocate_mmu_context - Allocate storage for the arch-specific MMU data
+ * @mm: The userspace VM context being set up
*/
static inline unsigned long allocate_mmu_context(struct mm_struct *mm)
{
@@ -58,7 +68,7 @@ static inline unsigned long allocate_mmu_context(struct mm_struct *mm)
if (!(mc & MMU_CONTEXT_TLBPID_MASK)) {
/* we exhausted the TLB PIDs of this version on this CPU, so we
* flush this CPU's TLB in its entirety and start new cycle */
- flush_tlb_all();
+ local_flush_tlb_all();
/* fix the TLB version if needed (we avoid version #0 so as to
* distingush MMU_NO_CONTEXT) */
@@ -101,22 +111,34 @@ static inline int init_new_context(struct task_struct *tsk,
}
/*
- * destroy context related info for an mm_struct that is about to be put to
- * rest
- */
-#define destroy_context(mm) do { } while (0)
-
-/*
* after we have set current->mm to a new value, this activates the context for
* the new mm so we see the new mappings.
*/
-static inline void activate_context(struct mm_struct *mm, int cpu)
+static inline void activate_context(struct mm_struct *mm)
{
PIDR = get_mmu_context(mm) & MMU_CONTEXT_TLBPID_MASK;
}
+#else /* CONFIG_MN10300_TLB_USE_PIDR */
-/*
- * change between virtual memory sets
+#define init_new_context(tsk, mm) (0)
+#define activate_context(mm) local_flush_tlb()
+
+#endif /* CONFIG_MN10300_TLB_USE_PIDR */
+
+/**
+ * destroy_context - Destroy mm context information
+ * @mm: The MM being destroyed.
+ *
+ * Destroy context related info for an mm_struct that is about to be put to
+ * rest
+ */
+#define destroy_context(mm) do {} while (0)
+
+/**
+ * switch_mm - Change between userspace virtual memory contexts
+ * @prev: The outgoing MM context.
+ * @next: The incoming MM context.
+ * @tsk: The incoming task.
*/
static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
struct task_struct *tsk)
@@ -124,11 +146,12 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
int cpu = smp_processor_id();
if (prev != next) {
+#ifdef CONFIG_SMP
+ per_cpu(cpu_tlbstate, cpu).active_mm = next;
+#endif
cpu_ran_vm(cpu, next);
- activate_context(next, cpu);
PTBR = (unsigned long) next->pgd;
- } else if (!cpu_maybe_ran_vm(cpu, next)) {
- activate_context(next, cpu);
+ activate_context(next);
}
}
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