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59615ecdb5
This provides a sledgehammer approach for clearing the TLBs, only to be used in cases where we know we will never want to use the mappings again and have no interest in preserving state. This also destroys wired entries. The primary use for this is when we are either entering or exiting the kernel completely, in the latter case as a precursor for CPU reset by MMU. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
138 lines
3.2 KiB
C
138 lines
3.2 KiB
C
/*
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* TLB flushing operations for SH with an MMU.
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*
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* Copyright (C) 1999 Niibe Yutaka
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* Copyright (C) 2003 Paul Mundt
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/mm.h>
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#include <asm/mmu_context.h>
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#include <asm/tlbflush.h>
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void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
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{
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unsigned int cpu = smp_processor_id();
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if (vma->vm_mm && cpu_context(cpu, vma->vm_mm) != NO_CONTEXT) {
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unsigned long flags;
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unsigned long asid;
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unsigned long saved_asid = MMU_NO_ASID;
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asid = cpu_asid(cpu, vma->vm_mm);
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page &= PAGE_MASK;
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local_irq_save(flags);
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if (vma->vm_mm != current->mm) {
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saved_asid = get_asid();
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set_asid(asid);
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}
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local_flush_tlb_one(asid, page);
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if (saved_asid != MMU_NO_ASID)
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set_asid(saved_asid);
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local_irq_restore(flags);
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}
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}
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void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
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unsigned long end)
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{
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struct mm_struct *mm = vma->vm_mm;
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unsigned int cpu = smp_processor_id();
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if (cpu_context(cpu, mm) != NO_CONTEXT) {
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unsigned long flags;
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int size;
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local_irq_save(flags);
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size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
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if (size > (MMU_NTLB_ENTRIES/4)) { /* Too many TLB to flush */
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cpu_context(cpu, mm) = NO_CONTEXT;
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if (mm == current->mm)
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activate_context(mm, cpu);
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} else {
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unsigned long asid;
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unsigned long saved_asid = MMU_NO_ASID;
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asid = cpu_asid(cpu, mm);
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start &= PAGE_MASK;
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end += (PAGE_SIZE - 1);
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end &= PAGE_MASK;
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if (mm != current->mm) {
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saved_asid = get_asid();
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set_asid(asid);
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}
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while (start < end) {
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local_flush_tlb_one(asid, start);
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start += PAGE_SIZE;
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}
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if (saved_asid != MMU_NO_ASID)
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set_asid(saved_asid);
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}
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local_irq_restore(flags);
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}
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}
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void local_flush_tlb_kernel_range(unsigned long start, unsigned long end)
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{
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unsigned int cpu = smp_processor_id();
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unsigned long flags;
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int size;
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local_irq_save(flags);
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size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
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if (size > (MMU_NTLB_ENTRIES/4)) { /* Too many TLB to flush */
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local_flush_tlb_all();
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} else {
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unsigned long asid;
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unsigned long saved_asid = get_asid();
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asid = cpu_asid(cpu, &init_mm);
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start &= PAGE_MASK;
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end += (PAGE_SIZE - 1);
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end &= PAGE_MASK;
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set_asid(asid);
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while (start < end) {
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local_flush_tlb_one(asid, start);
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start += PAGE_SIZE;
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}
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set_asid(saved_asid);
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}
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local_irq_restore(flags);
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}
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void local_flush_tlb_mm(struct mm_struct *mm)
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{
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unsigned int cpu = smp_processor_id();
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/* Invalidate all TLB of this process. */
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/* Instead of invalidating each TLB, we get new MMU context. */
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if (cpu_context(cpu, mm) != NO_CONTEXT) {
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unsigned long flags;
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local_irq_save(flags);
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cpu_context(cpu, mm) = NO_CONTEXT;
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if (mm == current->mm)
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activate_context(mm, cpu);
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local_irq_restore(flags);
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}
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}
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void __flush_tlb_global(void)
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{
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unsigned long flags;
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local_irq_save(flags);
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/*
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* This is the most destructive of the TLB flushing options,
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* and will tear down all of the UTLB/ITLB mappings, including
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* wired entries.
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*/
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__raw_writel(__raw_readl(MMUCR) | MMUCR_TI, MMUCR);
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local_irq_restore(flags);
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}
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