d6dd61c831
Add hooks to allow a paravirt implementation to track the lifetime of an mm. Paravirtualization requires three hooks, but only two are needed in common code. They are: arch_dup_mmap, which is called when a new mmap is created at fork arch_exit_mmap, which is called when the last process reference to an mm is dropped, which typically happens on exit and exec. The third hook is activate_mm, which is called from the arch-specific activate_mm() macro/function, and so doesn't need stub versions for other architectures. It's called when an mm is first used. Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com> Signed-off-by: Andi Kleen <ak@suse.de> Cc: linux-arch@vger.kernel.org Cc: James Bottomley <James.Bottomley@SteelEye.com> Acked-by: Ingo Molnar <mingo@elte.hu>
154 lines
3.3 KiB
C
154 lines
3.3 KiB
C
#ifndef __M68K_MMU_CONTEXT_H
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#define __M68K_MMU_CONTEXT_H
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#include <asm-generic/mm_hooks.h>
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static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
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{
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}
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#ifndef CONFIG_SUN3
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#include <asm/setup.h>
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#include <asm/page.h>
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#include <asm/pgalloc.h>
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static inline int init_new_context(struct task_struct *tsk,
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struct mm_struct *mm)
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{
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mm->context = virt_to_phys(mm->pgd);
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return 0;
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}
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#define destroy_context(mm) do { } while(0)
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static inline void switch_mm_0230(struct mm_struct *mm)
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{
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unsigned long crp[2] = {
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0x80000000 | _PAGE_TABLE, mm->context
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};
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unsigned long tmp;
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asm volatile (".chip 68030");
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/* flush MC68030/MC68020 caches (they are virtually addressed) */
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asm volatile (
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"movec %%cacr,%0;"
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"orw %1,%0; "
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"movec %0,%%cacr"
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: "=d" (tmp) : "di" (FLUSH_I_AND_D));
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/* Switch the root pointer. For a 030-only kernel,
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* avoid flushing the whole ATC, we only need to
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* flush the user entries. The 68851 does this by
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* itself. Avoid a runtime check here.
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*/
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asm volatile (
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#ifdef CPU_M68030_ONLY
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"pmovefd %0,%%crp; "
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"pflush #0,#4"
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#else
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"pmove %0,%%crp"
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#endif
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: : "m" (crp[0]));
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asm volatile (".chip 68k");
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}
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static inline void switch_mm_0460(struct mm_struct *mm)
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{
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asm volatile (".chip 68040");
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/* flush address translation cache (user entries) */
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asm volatile ("pflushan");
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/* switch the root pointer */
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asm volatile ("movec %0,%%urp" : : "r" (mm->context));
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if (CPU_IS_060) {
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unsigned long tmp;
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/* clear user entries in the branch cache */
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asm volatile (
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"movec %%cacr,%0; "
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"orl %1,%0; "
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"movec %0,%%cacr"
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: "=d" (tmp): "di" (0x00200000));
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}
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asm volatile (".chip 68k");
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}
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static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk)
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{
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if (prev != next) {
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if (CPU_IS_020_OR_030)
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switch_mm_0230(next);
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else
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switch_mm_0460(next);
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}
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}
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#define deactivate_mm(tsk,mm) do { } while (0)
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static inline void activate_mm(struct mm_struct *prev_mm,
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struct mm_struct *next_mm)
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{
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next_mm->context = virt_to_phys(next_mm->pgd);
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if (CPU_IS_020_OR_030)
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switch_mm_0230(next_mm);
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else
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switch_mm_0460(next_mm);
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}
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#else /* CONFIG_SUN3 */
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#include <asm/sun3mmu.h>
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#include <linux/sched.h>
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extern unsigned long get_free_context(struct mm_struct *mm);
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extern void clear_context(unsigned long context);
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/* set the context for a new task to unmapped */
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static inline int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
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{
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mm->context = SUN3_INVALID_CONTEXT;
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return 0;
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}
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/* find the context given to this process, and if it hasn't already
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got one, go get one for it. */
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static inline void get_mmu_context(struct mm_struct *mm)
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{
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if(mm->context == SUN3_INVALID_CONTEXT)
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mm->context = get_free_context(mm);
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}
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/* flush context if allocated... */
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static inline void destroy_context(struct mm_struct *mm)
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{
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if(mm->context != SUN3_INVALID_CONTEXT)
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clear_context(mm->context);
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}
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static inline void activate_context(struct mm_struct *mm)
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{
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get_mmu_context(mm);
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sun3_put_context(mm->context);
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}
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static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk)
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{
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activate_context(tsk->mm);
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}
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#define deactivate_mm(tsk,mm) do { } while (0)
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static inline void activate_mm(struct mm_struct *prev_mm,
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struct mm_struct *next_mm)
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{
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activate_context(next_mm);
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}
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#endif
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#endif
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