CRIS v10: Don't call get_mmu_context when switching between tasks with shared memory descriptors
Also, cleanup formatting and fix whitespace errors.
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40316c1fad
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4f073eff3f
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@ -4,8 +4,8 @@
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* Low level TLB handling
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*
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*
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* Copyright (C) 2000-2002 Axis Communications AB
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*
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* Copyright (C) 2000-2007 Axis Communications AB
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*
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* Authors: Bjorn Wesen (bjornw@axis.com)
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*
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*/
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@ -39,7 +39,7 @@ flush_tlb_all(void)
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unsigned long flags;
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/* the vpn of i & 0xf is so we dont write similar TLB entries
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* in the same 4-way entry group. details..
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* in the same 4-way entry group. details...
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*/
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local_irq_save(flags);
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@ -47,7 +47,7 @@ flush_tlb_all(void)
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*R_TLB_SELECT = ( IO_FIELD(R_TLB_SELECT, index, i) );
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*R_TLB_HI = ( IO_FIELD(R_TLB_HI, page_id, INVALID_PAGEID ) |
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IO_FIELD(R_TLB_HI, vpn, i & 0xf ) );
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*R_TLB_LO = ( IO_STATE(R_TLB_LO, global,no ) |
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IO_STATE(R_TLB_LO, valid, no ) |
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IO_STATE(R_TLB_LO, kernel,no ) |
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@ -71,10 +71,10 @@ flush_tlb_mm(struct mm_struct *mm)
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if(page_id == NO_CONTEXT)
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return;
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/* mark the TLB entries that match the page_id as invalid.
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* here we could also check the _PAGE_GLOBAL bit and NOT flush
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* global pages. is it worth the extra I/O ?
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* global pages. is it worth the extra I/O ?
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*/
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local_irq_save(flags);
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@ -83,7 +83,7 @@ flush_tlb_mm(struct mm_struct *mm)
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if (IO_EXTRACT(R_TLB_HI, page_id, *R_TLB_HI) == page_id) {
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*R_TLB_HI = ( IO_FIELD(R_TLB_HI, page_id, INVALID_PAGEID ) |
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IO_FIELD(R_TLB_HI, vpn, i & 0xf ) );
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*R_TLB_LO = ( IO_STATE(R_TLB_LO, global,no ) |
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IO_STATE(R_TLB_LO, valid, no ) |
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IO_STATE(R_TLB_LO, kernel,no ) |
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@ -96,9 +96,7 @@ flush_tlb_mm(struct mm_struct *mm)
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/* invalidate a single page */
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void
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flush_tlb_page(struct vm_area_struct *vma,
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unsigned long addr)
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void flush_tlb_page(struct vm_area_struct *vma, unsigned long addr)
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{
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struct mm_struct *mm = vma->vm_mm;
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int page_id = mm->context.page_id;
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@ -113,7 +111,7 @@ flush_tlb_page(struct vm_area_struct *vma,
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addr &= PAGE_MASK; /* perhaps not necessary */
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/* invalidate those TLB entries that match both the mm context
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* and the virtual address requested
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* and the virtual address requested
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*/
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local_irq_save(flags);
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@ -125,7 +123,7 @@ flush_tlb_page(struct vm_area_struct *vma,
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(tlb_hi & PAGE_MASK) == addr) {
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*R_TLB_HI = IO_FIELD(R_TLB_HI, page_id, INVALID_PAGEID ) |
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addr; /* same addr as before works. */
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*R_TLB_LO = ( IO_STATE(R_TLB_LO, global,no ) |
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IO_STATE(R_TLB_LO, valid, no ) |
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IO_STATE(R_TLB_LO, kernel,no ) |
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@ -144,7 +142,7 @@ dump_tlb_all(void)
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{
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int i;
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unsigned long flags;
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printk("TLB dump. LO is: pfn | reserved | global | valid | kernel | we |\n");
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local_save_flags(flags);
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@ -172,27 +170,29 @@ init_new_context(struct task_struct *tsk, struct mm_struct *mm)
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/* called in schedule() just before actually doing the switch_to */
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void
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switch_mm(struct mm_struct *prev, struct mm_struct *next,
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struct task_struct *tsk)
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void switch_mm(struct mm_struct *prev, struct mm_struct *next,
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struct task_struct *tsk)
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{
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/* make sure we have a context */
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if (prev != next) {
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/* make sure we have a context */
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get_mmu_context(next);
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get_mmu_context(next);
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/* remember the pgd for the fault handlers
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* this is similar to the pgd register in some other CPU's.
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* we need our own copy of it because current and active_mm
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* might be invalid at points where we still need to derefer
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* the pgd.
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*/
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/* remember the pgd for the fault handlers
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* this is similar to the pgd register in some other CPU's.
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* we need our own copy of it because current and active_mm
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* might be invalid at points where we still need to derefer
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* the pgd.
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*/
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per_cpu(current_pgd, smp_processor_id()) = next->pgd;
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per_cpu(current_pgd, smp_processor_id()) = next->pgd;
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/* switch context in the MMU */
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/* switch context in the MMU */
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D(printk("switching mmu_context to %d (%p)\n", next->context, next));
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D(printk(KERN_DEBUG "switching mmu_context to %d (%p)\n",
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next->context, next));
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*R_MMU_CONTEXT = IO_FIELD(R_MMU_CONTEXT, page_id, next->context.page_id);
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*R_MMU_CONTEXT = IO_FIELD(R_MMU_CONTEXT,
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page_id, next->context.page_id);
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}
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}
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