patch-2.4.20 linux-2.4.20/include/asm-x86_64/mmu_context.h
Next file: linux-2.4.20/include/asm-x86_64/mmx.h
Previous file: linux-2.4.20/include/asm-x86_64/mmu.h
Back to the patch index
Back to the overall index
- Lines: 74
- Date:
Thu Nov 28 15:53:15 2002
- Orig file:
linux-2.4.19/include/asm-x86_64/mmu_context.h
- Orig date:
Wed Dec 31 16:00:00 1969
diff -urN linux-2.4.19/include/asm-x86_64/mmu_context.h linux-2.4.20/include/asm-x86_64/mmu_context.h
@@ -0,0 +1,73 @@
+#ifndef __X86_64_MMU_CONTEXT_H
+#define __X86_64_MMU_CONTEXT_H
+
+#include <linux/config.h>
+#include <asm/desc.h>
+#include <asm/atomic.h>
+#include <asm/pgalloc.h>
+#include <asm/pda.h>
+#include <asm/pgtable.h>
+#include <linux/spinlock.h>
+
+/*
+ * possibly do the LDT unload here?
+ */
+#define destroy_context(mm) do { } while(0)
+#define init_new_context(tsk,mm) ({ rwlock_init(&(mm)->context.ldtlock); 0; })
+
+#ifdef CONFIG_SMP
+
+static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk, unsigned cpu)
+{
+ if(cpu_tlbstate[cpu].state == TLBSTATE_OK)
+ cpu_tlbstate[cpu].state = TLBSTATE_LAZY;
+}
+#else
+static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk, unsigned cpu)
+{
+}
+#endif
+
+#define activate_mm(prev, next) \
+ switch_mm((prev),(next),NULL,smp_processor_id())
+
+
+static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
+ struct task_struct *tsk, unsigned cpu)
+{
+ if (prev != next) {
+ /* stop flush ipis for the previous mm */
+ clear_bit(cpu, &prev->cpu_vm_mask);
+ /*
+ * Re-load LDT if necessary
+ */
+ if (prev->context.segments != next->context.segments)
+ load_LDT(next);
+#ifdef CONFIG_SMP
+ cpu_tlbstate[cpu].state = TLBSTATE_OK;
+ cpu_tlbstate[cpu].active_mm = next;
+#endif
+ set_bit(cpu, &next->cpu_vm_mask);
+ set_bit(cpu, &next->context.cpuvalid);
+ /* Re-load page tables */
+ *read_pda(level4_pgt) = __pa(next->pgd) | _PAGE_TABLE;
+ __flush_tlb();
+ }
+#ifdef CONFIG_SMP
+ else {
+ cpu_tlbstate[cpu].state = TLBSTATE_OK;
+ if(cpu_tlbstate[cpu].active_mm != next)
+ out_of_line_bug();
+ if(!test_and_set_bit(cpu, &next->cpu_vm_mask)) {
+ /* We were in lazy tlb mode and leave_mm disabled
+ * tlb flush IPI delivery. We must flush our tlb.
+ */
+ local_flush_tlb();
+ }
+ if (!test_and_set_bit(cpu, &next->context.cpuvalid))
+ load_LDT(next);
+ }
+#endif
+}
+
+#endif
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)