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81 lines
2.2 KiB
81 lines
2.2 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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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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/* |
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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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