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6732c0e494
Legacy ARC700 processors (first generation of MMU enabled ARC cores) had VIPT cached which could be configured such that they could alias. Corresponding support in kernel (with all the obnoxious cache flush overhead) was added in ARC port 10 years ago to support 1 silicon. That is long bygone and we can let it RIP. Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Vineet Gupta <vgupta@kernel.org>
81 lines
2 KiB
C
81 lines
2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* ARC700 mmap
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*
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* (started from arm version - for VIPT alias handling)
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*
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* Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
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*/
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#include <linux/fs.h>
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#include <linux/mm.h>
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#include <linux/mman.h>
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#include <linux/sched/mm.h>
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#include <asm/cacheflush.h>
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/*
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* Ensure that shared mappings are correctly aligned to
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* avoid aliasing issues with VIPT caches.
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* We need to ensure that
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* a specific page of an object is always mapped at a multiple of
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* SHMLBA bytes.
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*/
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unsigned long
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arch_get_unmapped_area(struct file *filp, unsigned long addr,
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unsigned long len, unsigned long pgoff, unsigned long flags)
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{
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struct mm_struct *mm = current->mm;
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struct vm_area_struct *vma;
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struct vm_unmapped_area_info info;
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/*
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* We enforce the MAP_FIXED case.
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*/
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if (flags & MAP_FIXED) {
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if (flags & MAP_SHARED &&
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(addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1))
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return -EINVAL;
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return addr;
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}
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if (len > TASK_SIZE)
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return -ENOMEM;
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if (addr) {
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addr = PAGE_ALIGN(addr);
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vma = find_vma(mm, addr);
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if (TASK_SIZE - len >= addr &&
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(!vma || addr + len <= vm_start_gap(vma)))
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return addr;
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}
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info.flags = 0;
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info.length = len;
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info.low_limit = mm->mmap_base;
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info.high_limit = TASK_SIZE;
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info.align_mask = 0;
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info.align_offset = pgoff << PAGE_SHIFT;
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return vm_unmapped_area(&info);
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}
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static const pgprot_t protection_map[16] = {
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[VM_NONE] = PAGE_U_NONE,
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[VM_READ] = PAGE_U_R,
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[VM_WRITE] = PAGE_U_R,
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[VM_WRITE | VM_READ] = PAGE_U_R,
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[VM_EXEC] = PAGE_U_X_R,
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[VM_EXEC | VM_READ] = PAGE_U_X_R,
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[VM_EXEC | VM_WRITE] = PAGE_U_X_R,
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[VM_EXEC | VM_WRITE | VM_READ] = PAGE_U_X_R,
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[VM_SHARED] = PAGE_U_NONE,
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[VM_SHARED | VM_READ] = PAGE_U_R,
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[VM_SHARED | VM_WRITE] = PAGE_U_W_R,
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[VM_SHARED | VM_WRITE | VM_READ] = PAGE_U_W_R,
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[VM_SHARED | VM_EXEC] = PAGE_U_X_R,
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[VM_SHARED | VM_EXEC | VM_READ] = PAGE_U_X_R,
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[VM_SHARED | VM_EXEC | VM_WRITE] = PAGE_U_X_W_R,
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[VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = PAGE_U_X_W_R
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};
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DECLARE_VM_GET_PAGE_PROT
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