This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / include / asm-i386 / mach-xen / asm / mmu_context.h

diff --git a/include/asm-i386/mach-xen/asm/mmu_context.h b/include/asm-i386/mach-xen/asm/mmu_context.h
new file mode 100644 (file)
index 0000000..317d597
--- /dev/null
+++ b/include/asm-i386/mach-xen/asm/mmu_context.h
@@ -0,0 +1,109 @@
+#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)
+{
+#if 0 /* XEN: no lazy tlb */
+       unsigned cpu = smp_processor_id();
+       if (per_cpu(cpu_tlbstate, cpu).state == TLBSTATE_OK)
+               per_cpu(cpu_tlbstate, cpu).state = TLBSTATE_LAZY;
+#endif
+}
+
+#define prepare_arch_switch(next)      __prepare_arch_switch()
+
+static inline void __prepare_arch_switch(void)
+{
+       /*
+        * Save away %fs and %gs. No need to save %es and %ds, as those
+        * are always kernel segments while inside the kernel. Must
+        * happen before reload of cr3/ldt (i.e., not in __switch_to).
+        */
+       asm volatile ( "mov %%fs,%0 ; mov %%gs,%1"
+               : "=m" (current->thread.fs),
+                 "=m" (current->thread.gs));
+       asm volatile ( "movl %0,%%fs ; movl %0,%%gs"
+               : : "r" (0) );
+}
+
+extern void mm_pin(struct mm_struct *mm);
+extern void mm_unpin(struct mm_struct *mm);
+void mm_pin_all(void);
+
+static inline void switch_mm(struct mm_struct *prev,
+                            struct mm_struct *next,
+                            struct task_struct *tsk)
+{
+       int cpu = smp_processor_id();
+       struct mmuext_op _op[2], *op = _op;
+
+       if (likely(prev != next)) {
+               BUG_ON(!xen_feature(XENFEAT_writable_page_tables) &&
+                      !test_bit(PG_pinned, &virt_to_page(next->pgd)->flags));
+
+               /* stop flush ipis for the previous mm */
+               cpu_clear(cpu, prev->cpu_vm_mask);
+#if 0 /* XEN: no lazy tlb */
+               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) */
+               op->cmd = MMUEXT_NEW_BASEPTR;
+               op->arg1.mfn = pfn_to_mfn(__pa(next->pgd) >> PAGE_SHIFT);
+               op++;
+
+               /*
+                * load the LDT, if the LDT is different:
+                */
+               if (unlikely(prev->context.ldt != next->context.ldt)) {
+                       /* load_LDT_nolock(&next->context, cpu) */
+                       op->cmd = MMUEXT_SET_LDT;
+                       op->arg1.linear_addr = (unsigned long)next->context.ldt;
+                       op->arg2.nr_ents     = next->context.size;
+                       op++;
+               }
+
+               BUG_ON(HYPERVISOR_mmuext_op(_op, op-_op, NULL, DOMID_SELF));
+       }
+#if 0 /* XEN: no lazy tlb */
+       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))
+
+static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
+{
+       if (!test_bit(PG_pinned, &virt_to_page(next->pgd)->flags))
+               mm_pin(next);
+       switch_mm(prev, next, NULL);
+}
+
+#endif