/* * This file contains the routines for TLB flushing. * On machines where the MMU uses a hash table to store virtual to * physical translations, these routines flush entries from the * hash table also. * -- paulus * * Derived from arch/ppc/mm/init.c: * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) * * Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au) * and Cort Dougan (PReP) (cort@cs.nmt.edu) * Copyright (C) 1996 Paul Mackerras * Amiga/APUS changes by Jesper Skov (jskov@cygnus.co.uk). * * Derived from "arch/i386/mm/init.c" * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * */ #include <linux/kernel.h> #include <linux/mm.h> #include <linux/init.h> #include <linux/highmem.h> #include <linux/pagemap.h> #include <asm/tlbflush.h> #include <asm/tlb.h> #include "mmu_decl.h" /* * Called when unmapping pages to flush entries from the TLB/hash table. */ void flush_hash_entry(struct mm_struct *mm, pte_t *ptep, unsigned long addr) { unsigned long ptephys; if (Hash != 0) { ptephys = __pa(ptep) & PAGE_MASK; flush_hash_pages(mm->context.id, addr, ptephys, 1); } } /* * Called by ptep_set_access_flags, must flush on CPUs for which the * DSI handler can't just "fixup" the TLB on a write fault */ void flush_tlb_page_nohash(struct vm_area_struct *vma, unsigned long addr) { if (Hash != 0) return; _tlbie(addr); } /* * Called at the end of a mmu_gather operation to make sure the * TLB flush is completely done. */ void tlb_flush(struct mmu_gather *tlb) { if (Hash == 0) { /* * 603 needs to flush the whole TLB here since * it doesn't use a hash table. */ _tlbia(); } } /* * TLB flushing: * * - flush_tlb_mm(mm) flushes the specified mm context TLB's * - flush_tlb_page(vma, vmaddr) flushes one page * - flush_tlb_range(vma, start, end) flushes a range of pages * - flush_tlb_kernel_range(start, end) flushes kernel pages * * since the hardware hash table functions as an extension of the * tlb as far as the linux tables are concerned, flush it too. * -- Cort */ /* * 750 SMP is a Bad Idea because the 750 doesn't broadcast all * the cache operations on the bus. Hence we need to use an IPI * to get the other CPU(s) to invalidate their TLBs. */ #ifdef CONFIG_SMP_750 #define FINISH_FLUSH smp_send_tlb_invalidate(0) #else #define FINISH_FLUSH do { } while (0) #endif static void flush_range(struct mm_struct *mm, unsigned long start, unsigned long end) { pmd_t *pmd; unsigned long pmd_end; int count; unsigned int ctx = mm->context.id; if (Hash == 0) { _tlbia(); return; } start &= PAGE_MASK; if (start >= end) return; end = (end - 1) | ~PAGE_MASK; pmd = pmd_offset(pgd_offset(mm, start), start); for (;;) { pmd_end = ((start + PGDIR_SIZE) & PGDIR_MASK) - 1; if (pmd_end > end) pmd_end = end; if (!pmd_none(*pmd)) { count = ((pmd_end - start) >> PAGE_SHIFT) + 1; flush_hash_pages(ctx, start, pmd_val(*pmd), count); } if (pmd_end == end) break; start = pmd_end + 1; ++pmd; } } /* * Flush kernel TLB entries in the given range */ void flush_tlb_kernel_range(unsigned long start, unsigned long end) { flush_range(&init_mm, start, end); FINISH_FLUSH; } /* * Flush all the (user) entries for the address space described by mm. */ void flush_tlb_mm(struct mm_struct *mm) { struct vm_area_struct *mp; if (Hash == 0) { _tlbia(); return; } for (mp = mm->mmap; mp != NULL; mp = mp->vm_next) flush_range(mp->vm_mm, mp->vm_start, mp->vm_end); FINISH_FLUSH; } void flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr) { struct mm_struct *mm; pmd_t *pmd; if (Hash == 0) { _tlbie(vmaddr); return; } mm = (vmaddr < TASK_SIZE)? vma->vm_mm: &init_mm; pmd = pmd_offset(pgd_offset(mm, vmaddr), vmaddr); if (!pmd_none(*pmd)) flush_hash_pages(mm->context.id, vmaddr, pmd_val(*pmd), 1); FINISH_FLUSH; } /* * For each address in the range, find the pte for the address * and check _PAGE_HASHPTE bit; if it is set, find and destroy * the corresponding HPTE. */ void flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end) { flush_range(vma->vm_mm, start, end); FINISH_FLUSH; }