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190 lines
4.6 KiB
190 lines
4.6 KiB
/*
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* Based on arch/arm/include/asm/tlbflush.h
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*
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* Copyright (C) 1999-2003 Russell King
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* Copyright (C) 2012 ARM Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ASM_TLBFLUSH_H
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#define __ASM_TLBFLUSH_H
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#ifndef __ASSEMBLY__
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#include <linux/sched.h>
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#include <asm/cputype.h>
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/*
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* Raw TLBI operations.
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*
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* Where necessary, use the __tlbi() macro to avoid asm()
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* boilerplate. Drivers and most kernel code should use the TLB
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* management routines in preference to the macro below.
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*
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* The macro can be used as __tlbi(op) or __tlbi(op, arg), depending
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* on whether a particular TLBI operation takes an argument or
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* not. The macros handles invoking the asm with or without the
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* register argument as appropriate.
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*/
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#define __TLBI_0(op, arg) asm ("tlbi " #op)
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#define __TLBI_1(op, arg) asm ("tlbi " #op ", %0" : : "r" (arg))
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#define __TLBI_N(op, arg, n, ...) __TLBI_##n(op, arg)
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#define __tlbi(op, ...) __TLBI_N(op, ##__VA_ARGS__, 1, 0)
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/*
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* TLB Management
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* ==============
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*
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* The TLB specific code is expected to perform whatever tests it needs
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* to determine if it should invalidate the TLB for each call. Start
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* addresses are inclusive and end addresses are exclusive; it is safe to
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* round these addresses down.
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*
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* flush_tlb_all()
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*
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* Invalidate the entire TLB.
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*
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* flush_tlb_mm(mm)
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*
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* Invalidate all TLB entries in a particular address space.
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* - mm - mm_struct describing address space
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*
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* flush_tlb_range(mm,start,end)
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*
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* Invalidate a range of TLB entries in the specified address
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* space.
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* - mm - mm_struct describing address space
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* - start - start address (may not be aligned)
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* - end - end address (exclusive, may not be aligned)
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*
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* flush_tlb_page(vaddr,vma)
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*
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* Invalidate the specified page in the specified address range.
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* - vaddr - virtual address (may not be aligned)
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* - vma - vma_struct describing address range
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*
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* flush_kern_tlb_page(kaddr)
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*
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* Invalidate the TLB entry for the specified page. The address
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* will be in the kernels virtual memory space. Current uses
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* only require the D-TLB to be invalidated.
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* - kaddr - Kernel virtual memory address
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*/
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static inline void local_flush_tlb_all(void)
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{
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dsb(nshst);
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__tlbi(vmalle1);
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dsb(nsh);
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isb();
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}
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static inline void flush_tlb_all(void)
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{
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dsb(ishst);
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__tlbi(vmalle1is);
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dsb(ish);
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isb();
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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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unsigned long asid = ASID(mm) << 48;
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dsb(ishst);
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__tlbi(aside1is, asid);
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dsb(ish);
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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 uaddr)
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{
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unsigned long addr = uaddr >> 12 | (ASID(vma->vm_mm) << 48);
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dsb(ishst);
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__tlbi(vale1is, addr);
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dsb(ish);
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}
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/*
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* This is meant to avoid soft lock-ups on large TLB flushing ranges and not
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* necessarily a performance improvement.
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*/
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#define MAX_TLB_RANGE (1024UL << PAGE_SHIFT)
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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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bool last_level)
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{
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unsigned long asid = ASID(vma->vm_mm) << 48;
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unsigned long addr;
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if ((end - start) > MAX_TLB_RANGE) {
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flush_tlb_mm(vma->vm_mm);
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return;
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}
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start = asid | (start >> 12);
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end = asid | (end >> 12);
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dsb(ishst);
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for (addr = start; addr < end; addr += 1 << (PAGE_SHIFT - 12)) {
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if (last_level)
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__tlbi(vale1is, addr);
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else
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__tlbi(vae1is, addr);
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}
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dsb(ish);
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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_range(vma, start, end, false);
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}
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static inline void flush_tlb_kernel_range(unsigned long start, unsigned long end)
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{
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unsigned long addr;
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if ((end - start) > MAX_TLB_RANGE) {
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flush_tlb_all();
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return;
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}
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start >>= 12;
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end >>= 12;
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dsb(ishst);
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for (addr = start; addr < end; addr += 1 << (PAGE_SHIFT - 12))
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__tlbi(vaae1is, addr);
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dsb(ish);
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isb();
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}
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/*
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* Used to invalidate the TLB (walk caches) corresponding to intermediate page
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* table levels (pgd/pud/pmd).
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*/
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static inline void __flush_tlb_pgtable(struct mm_struct *mm,
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unsigned long uaddr)
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{
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unsigned long addr = uaddr >> 12 | (ASID(mm) << 48);
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__tlbi(vae1is, addr);
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dsb(ish);
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}
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#endif
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#endif
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