120 строки
3.0 KiB
C
120 строки
3.0 KiB
C
#ifndef _X8664_TLBFLUSH_H
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#define _X8664_TLBFLUSH_H
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#include <linux/config.h>
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#include <linux/mm.h>
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#include <asm/processor.h>
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#define __flush_tlb() \
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do { \
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unsigned long tmpreg; \
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\
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__asm__ __volatile__( \
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"movq %%cr3, %0; # flush TLB \n" \
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"movq %0, %%cr3; \n" \
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: "=r" (tmpreg) \
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:: "memory"); \
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} while (0)
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/*
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* Global pages have to be flushed a bit differently. Not a real
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* performance problem because this does not happen often.
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*/
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#define __flush_tlb_global() \
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do { \
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unsigned long tmpreg; \
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\
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__asm__ __volatile__( \
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"movq %1, %%cr4; # turn off PGE \n" \
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"movq %%cr3, %0; # flush TLB \n" \
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"movq %0, %%cr3; \n" \
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"movq %2, %%cr4; # turn PGE back on \n" \
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: "=&r" (tmpreg) \
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: "r" (mmu_cr4_features & ~X86_CR4_PGE), \
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"r" (mmu_cr4_features) \
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: "memory"); \
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} while (0)
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extern unsigned long pgkern_mask;
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#define __flush_tlb_all() __flush_tlb_global()
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#define __flush_tlb_one(addr) \
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__asm__ __volatile__("invlpg %0": :"m" (*(char *) addr))
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/*
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* TLB flushing:
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*
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* - flush_tlb() flushes the current mm struct TLBs
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* - flush_tlb_all() flushes all processes TLBs
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* - flush_tlb_mm(mm) flushes the specified mm context TLB's
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* - flush_tlb_page(vma, vmaddr) flushes one page
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* - flush_tlb_range(vma, start, end) flushes a range of pages
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* - flush_tlb_kernel_range(start, end) flushes a range of kernel pages
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* - flush_tlb_pgtables(mm, start, end) flushes a range of page tables
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*
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* ..but the x86_64 has somewhat limited tlb flushing capabilities,
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* and page-granular flushes are available only on i486 and up.
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*/
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#ifndef CONFIG_SMP
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#define flush_tlb() __flush_tlb()
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#define flush_tlb_all() __flush_tlb_all()
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#define local_flush_tlb() __flush_tlb()
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static inline void flush_tlb_mm(struct mm_struct *mm)
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{
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if (mm == current->active_mm)
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__flush_tlb();
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}
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static inline void flush_tlb_page(struct vm_area_struct *vma,
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unsigned long addr)
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{
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if (vma->vm_mm == current->active_mm)
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__flush_tlb_one(addr);
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}
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static inline void flush_tlb_range(struct vm_area_struct *vma,
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unsigned long start, unsigned long end)
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{
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if (vma->vm_mm == current->active_mm)
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__flush_tlb();
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}
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#else
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#include <asm/smp.h>
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#define local_flush_tlb() \
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__flush_tlb()
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extern void flush_tlb_all(void);
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extern void flush_tlb_current_task(void);
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extern void flush_tlb_mm(struct mm_struct *);
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extern void flush_tlb_page(struct vm_area_struct *, unsigned long);
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#define flush_tlb() flush_tlb_current_task()
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static inline void flush_tlb_range(struct vm_area_struct * vma, unsigned long start, unsigned long end)
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{
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flush_tlb_mm(vma->vm_mm);
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}
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#define TLBSTATE_OK 1
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#define TLBSTATE_LAZY 2
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#endif
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#define flush_tlb_kernel_range(start, end) flush_tlb_all()
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static inline void flush_tlb_pgtables(struct mm_struct *mm,
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unsigned long start, unsigned long end)
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{
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/* x86_64 does not keep any page table caches in TLB */
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}
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#endif /* _X8664_TLBFLUSH_H */
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