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

[linux-2.6.git] / include / asm-powerpc / mmu_context.h

diff --git a/include/asm-powerpc/mmu_context.h b/include/asm-powerpc/mmu_context.h
new file mode 100644 (file)
index 0000000..1b8a25f
--- /dev/null
+++ b/include/asm-powerpc/mmu_context.h
@@ -0,0 +1,91 @@
+#ifndef __ASM_POWERPC_MMU_CONTEXT_H
+#define __ASM_POWERPC_MMU_CONTEXT_H
+#ifdef __KERNEL__
+
+#ifndef CONFIG_PPC64
+#include <asm-ppc/mmu_context.h>
+#else
+
+#include <linux/kernel.h>      
+#include <linux/mm.h>  
+#include <asm/mmu.h>   
+#include <asm/cputable.h>
+
+/*
+ * Copyright (C) 2001 PPC 64 Team, IBM Corp
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+/*
+ * Getting into a kernel thread, there is no valid user segment, mark
+ * paca->pgdir NULL so that SLB miss on user addresses will fault
+ */
+static inline void enter_lazy_tlb(struct mm_struct *mm,
+                                 struct task_struct *tsk)
+{
+#ifdef CONFIG_PPC_64K_PAGES
+       get_paca()->pgdir = NULL;
+#endif /* CONFIG_PPC_64K_PAGES */
+}
+
+#define NO_CONTEXT     0
+#define MAX_CONTEXT    (0x100000-1)
+
+extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
+extern void destroy_context(struct mm_struct *mm);
+
+extern void switch_stab(struct task_struct *tsk, struct mm_struct *mm);
+extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm);
+
+/*
+ * switch_mm is the entry point called from the architecture independent
+ * code in kernel/sched.c
+ */
+static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
+                            struct task_struct *tsk)
+{
+       if (!cpu_isset(smp_processor_id(), next->cpu_vm_mask))
+               cpu_set(smp_processor_id(), next->cpu_vm_mask);
+
+       /* No need to flush userspace segments if the mm doesnt change */
+#ifdef CONFIG_PPC_64K_PAGES
+       if (prev == next && get_paca()->pgdir == next->pgd)
+               return;
+#else
+       if (prev == next)
+               return;
+#endif /* CONFIG_PPC_64K_PAGES */
+
+#ifdef CONFIG_ALTIVEC
+       if (cpu_has_feature(CPU_FTR_ALTIVEC))
+               asm volatile ("dssall");
+#endif /* CONFIG_ALTIVEC */
+
+       if (cpu_has_feature(CPU_FTR_SLB))
+               switch_slb(tsk, next);
+       else
+               switch_stab(tsk, next);
+}
+
+#define deactivate_mm(tsk,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_mm(struct mm_struct *prev, struct mm_struct *next)
+{
+       unsigned long flags;
+
+       local_irq_save(flags);
+       switch_mm(prev, next, current);
+       local_irq_restore(flags);
+}
+
+#endif /* CONFIG_PPC64 */
+#endif /* __KERNEL__ */
+#endif /* __ASM_POWERPC_MMU_CONTEXT_H */