153 строки
3.4 KiB
C
153 строки
3.4 KiB
C
#ifndef _S390_TLBFLUSH_H
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#define _S390_TLBFLUSH_H
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#include <linux/mm.h>
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#include <asm/processor.h>
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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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/*
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* S/390 has three ways of flushing TLBs
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* 'ptlb' does a flush of the local processor
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* 'csp' flushes the TLBs on all PUs of a SMP
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* 'ipte' invalidates a pte in a page table and flushes that out of
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* the TLBs of all PUs of a SMP
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*/
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#define local_flush_tlb() \
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do { asm volatile("ptlb": : :"memory"); } while (0)
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#ifndef CONFIG_SMP
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/*
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* We always need to flush, since s390 does not flush tlb
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* on each context switch
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*/
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static inline void flush_tlb(void)
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{
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local_flush_tlb();
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}
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static inline void flush_tlb_all(void)
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{
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local_flush_tlb();
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}
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static inline void flush_tlb_mm(struct mm_struct *mm)
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{
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local_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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local_flush_tlb();
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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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local_flush_tlb();
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}
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#define flush_tlb_kernel_range(start, end) \
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local_flush_tlb();
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#else
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#include <asm/smp.h>
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extern void smp_ptlb_all(void);
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static inline void global_flush_tlb(void)
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{
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register unsigned long reg2 asm("2");
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register unsigned long reg3 asm("3");
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register unsigned long reg4 asm("4");
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long dummy;
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#ifndef __s390x__
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if (!MACHINE_HAS_CSP) {
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smp_ptlb_all();
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return;
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}
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#endif /* __s390x__ */
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dummy = 0;
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reg2 = reg3 = 0;
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reg4 = ((unsigned long) &dummy) + 1;
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asm volatile(
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" csp %0,%2"
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: : "d" (reg2), "d" (reg3), "d" (reg4), "m" (dummy) : "cc" );
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}
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/*
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* We only have to do global flush of tlb if process run since last
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* flush on any other pu than current.
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* If we have threads (mm->count > 1) we always do a global flush,
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* since the process runs on more than one processor at the same time.
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*/
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static inline void __flush_tlb_mm(struct mm_struct * mm)
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{
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cpumask_t local_cpumask;
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if (unlikely(cpus_empty(mm->cpu_vm_mask)))
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return;
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if (MACHINE_HAS_IDTE) {
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asm volatile(
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" .insn rrf,0xb98e0000,0,%0,%1,0"
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: : "a" (2048), "a" (__pa(mm->pgd)&PAGE_MASK) : "cc");
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return;
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}
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preempt_disable();
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local_cpumask = cpumask_of_cpu(smp_processor_id());
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if (cpus_equal(mm->cpu_vm_mask, local_cpumask))
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local_flush_tlb();
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else
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global_flush_tlb();
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preempt_enable();
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}
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static inline void flush_tlb(void)
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{
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__flush_tlb_mm(current->mm);
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}
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static inline void flush_tlb_all(void)
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{
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global_flush_tlb();
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}
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static inline void flush_tlb_mm(struct mm_struct *mm)
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{
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__flush_tlb_mm(mm);
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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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__flush_tlb_mm(vma->vm_mm);
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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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__flush_tlb_mm(vma->vm_mm);
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}
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#define flush_tlb_kernel_range(start, end) global_flush_tlb()
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#endif
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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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/* S/390 does not keep any page table caches in TLB */
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}
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#endif /* _S390_TLBFLUSH_H */
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