95 lines
2.8 KiB
C
95 lines
2.8 KiB
C
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/*
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* Hexagon Virtual Machine TLB functions
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*
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* Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
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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 and
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* only version 2 as 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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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/*
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* The Hexagon Virtual Machine conceals the real workings of
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* the TLB, but there are one or two functions that need to
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* be instantiated for it, differently from a native build.
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*/
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#include <linux/mm.h>
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#include <linux/sched.h>
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#include <asm/page.h>
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#include <asm/hexagon_vm.h>
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/*
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* Initial VM implementation has only one map active at a time, with
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* TLB purgings on changes. So either we're nuking the current map,
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* or it's a no-op. This operation is messy on true SMPs where other
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* processors must be induced to flush the copies in their local TLBs,
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* but Hexagon thread-based virtual processors share the same MMU.
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*/
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void 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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if (mm->context.ptbase == current->active_mm->context.ptbase)
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__vmclrmap((void *)start, end - start);
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}
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/*
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* Flush a page from the kernel virtual map - used by highmem
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*/
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void flush_tlb_one(unsigned long vaddr)
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{
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__vmclrmap((void *)vaddr, PAGE_SIZE);
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}
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/*
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* Flush all TLBs across all CPUs, virtual or real.
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* A single Hexagon core has 6 thread contexts but
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* only one TLB.
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*/
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void tlb_flush_all(void)
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{
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/* should probably use that fixaddr end or whateve label */
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__vmclrmap(0, 0xffff0000);
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}
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/*
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* Flush TLB entries associated with a given mm_struct mapping.
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*/
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void flush_tlb_mm(struct mm_struct *mm)
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{
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/* Current Virtual Machine has only one map active at a time */
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if (current->active_mm->context.ptbase == mm->context.ptbase)
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tlb_flush_all();
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}
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/*
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* Flush TLB state associated with a page of a vma.
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*/
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void flush_tlb_page(struct vm_area_struct *vma, unsigned long vaddr)
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{
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struct mm_struct *mm = vma->vm_mm;
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if (mm->context.ptbase == current->active_mm->context.ptbase)
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__vmclrmap((void *)vaddr, PAGE_SIZE);
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}
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/*
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* Flush TLB entries associated with a kernel address range.
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* Like flush range, but without the check on the vma->vm_mm.
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*/
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void flush_tlb_kernel_range(unsigned long start, unsigned long end)
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{
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__vmclrmap((void *)start, end - start);
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}
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