/* * arch/xtensa/mm/tlb.c * * Logic that manipulates the Xtensa MMU. Derived from MIPS. * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (C) 2001 - 2003 Tensilica Inc. * * Joe Taylor * Chris Zankel <chris@zankel.net> * Marc Gauthier */ #include <linux/mm.h> #include <asm/processor.h> #include <asm/mmu_context.h> #include <asm/tlbflush.h> #include <asm/system.h> #include <asm/cacheflush.h> static inline void __flush_itlb_all (void) { int w, i; for (w = 0; w < ITLB_ARF_WAYS; w++) { for (i = 0; i < (1 << XCHAL_ITLB_ARF_ENTRIES_LOG2); i++) { int e = w + (i << PAGE_SHIFT); invalidate_itlb_entry_no_isync(e); } } asm volatile ("isync\n"); } static inline void __flush_dtlb_all (void) { int w, i; for (w = 0; w < DTLB_ARF_WAYS; w++) { for (i = 0; i < (1 << XCHAL_DTLB_ARF_ENTRIES_LOG2); i++) { int e = w + (i << PAGE_SHIFT); invalidate_dtlb_entry_no_isync(e); } } asm volatile ("isync\n"); } void flush_tlb_all (void) { __flush_itlb_all(); __flush_dtlb_all(); } /* If mm is current, we simply assign the current task a new ASID, thus, * invalidating all previous tlb entries. If mm is someone else's user mapping, * wie invalidate the context, thus, when that user mapping is swapped in, * a new context will be assigned to it. */ void flush_tlb_mm(struct mm_struct *mm) { if (mm == current->active_mm) { int flags; local_save_flags(flags); __get_new_mmu_context(mm); __load_mmu_context(mm); local_irq_restore(flags); } else mm->context = 0; } #define _ITLB_ENTRIES (ITLB_ARF_WAYS << XCHAL_ITLB_ARF_ENTRIES_LOG2) #define _DTLB_ENTRIES (DTLB_ARF_WAYS << XCHAL_DTLB_ARF_ENTRIES_LOG2) #if _ITLB_ENTRIES > _DTLB_ENTRIES # define _TLB_ENTRIES _ITLB_ENTRIES #else # define _TLB_ENTRIES _DTLB_ENTRIES #endif void flush_tlb_range (struct vm_area_struct *vma, unsigned long start, unsigned long end) { struct mm_struct *mm = vma->vm_mm; unsigned long flags; if (mm->context == NO_CONTEXT) return; #if 0 printk("[tlbrange<%02lx,%08lx,%08lx>]\n", (unsigned long)mm->context, start, end); #endif local_save_flags(flags); if (end-start + (PAGE_SIZE-1) <= _TLB_ENTRIES << PAGE_SHIFT) { int oldpid = get_rasid_register(); set_rasid_register (ASID_INSERT(mm->context)); start &= PAGE_MASK; if (vma->vm_flags & VM_EXEC) while(start < end) { invalidate_itlb_mapping(start); invalidate_dtlb_mapping(start); start += PAGE_SIZE; } else while(start < end) { invalidate_dtlb_mapping(start); start += PAGE_SIZE; } set_rasid_register(oldpid); } else { flush_tlb_mm(mm); } local_irq_restore(flags); } void flush_tlb_page (struct vm_area_struct *vma, unsigned long page) { struct mm_struct* mm = vma->vm_mm; unsigned long flags; int oldpid; if(mm->context == NO_CONTEXT) return; local_save_flags(flags); oldpid = get_rasid_register(); if (vma->vm_flags & VM_EXEC) invalidate_itlb_mapping(page); invalidate_dtlb_mapping(page); set_rasid_register(oldpid); local_irq_restore(flags); }