1 files changed, 72 insertions, 0 deletions

diff --git a/include/asm-i386/mmu_context.h b/include/asm-i386/mmu_context.h
new file mode 100644
index 000000000000..bf08218357ea
--- /dev/null
+++ b/include/asm-i386/mmu_context.h
@@ -0,0 +1,72 @@
+#ifndef __I386_SCHED_H
+#define __I386_SCHED_H
+
+#include <linux/config.h>
+#include <asm/desc.h>
+#include <asm/atomic.h>
+#include <asm/pgalloc.h>
+#include <asm/tlbflush.h>
+
+/*
+ * Used for LDT copy/destruction.
+ */
+int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
+void destroy_context(struct mm_struct *mm);
+
+
+static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
+{
+#ifdef CONFIG_SMP
+        unsigned cpu = smp_processor_id();
+        if (per_cpu(cpu_tlbstate, cpu).state == TLBSTATE_OK)
+                per_cpu(cpu_tlbstate, cpu).state = TLBSTATE_LAZY;
+#endif
+}
+
+static inline void switch_mm(struct mm_struct *prev,
+                             struct mm_struct *next,
+                             struct task_struct *tsk)
+{
+        int cpu = smp_processor_id();
+
+        if (likely(prev != next)) {
+                /* stop flush ipis for the previous mm */
+                cpu_clear(cpu, prev->cpu_vm_mask);
+#ifdef CONFIG_SMP
+                per_cpu(cpu_tlbstate, cpu).state = TLBSTATE_OK;
+                per_cpu(cpu_tlbstate, cpu).active_mm = next;
+#endif
+                cpu_set(cpu, next->cpu_vm_mask);
+
+                /* Re-load page tables */
+                load_cr3(next->pgd);
+
+                /*
+                 * load the LDT, if the LDT is different:
+                 */
+                if (unlikely(prev->context.ldt != next->context.ldt))
+                        load_LDT_nolock(&next->context, cpu);
+        }
+#ifdef CONFIG_SMP
+        else {
+                per_cpu(cpu_tlbstate, cpu).state = TLBSTATE_OK;
+                BUG_ON(per_cpu(cpu_tlbstate, cpu).active_mm != next);
+
+                if (!cpu_test_and_set(cpu, next->cpu_vm_mask)) {
+                        /* We were in lazy tlb mode and leave_mm disabled 
+                         * tlb flush IPI delivery. We must reload %cr3.
+                         */
+                        load_cr3(next->pgd);
+                        load_LDT_nolock(&next->context, cpu);
+                }
+        }
+#endif
+}
+
+#define deactivate_mm(tsk, mm) \
+        asm("movl %0,%%fs ; movl %0,%%gs": :"r" (0))
+
+#define activate_mm(prev, next) \
+        switch_mm((prev),(next),NULL)
+
+#endif