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76 lines
1.8 KiB
76 lines
1.8 KiB
// 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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#define COLOUR_ALIGN(addr, pgoff) \ |
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((((addr) + SHMLBA - 1) & ~(SHMLBA - 1)) + \ |
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(((pgoff) << PAGE_SHIFT) & (SHMLBA - 1))) |
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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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int do_align = 0; |
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int aliasing = cache_is_vipt_aliasing(); |
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struct vm_unmapped_area_info info; |
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/* |
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* We only need to do colour alignment if D cache aliases. |
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*/ |
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if (aliasing) |
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do_align = filp || (flags & MAP_SHARED); |
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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 (aliasing && 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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if (do_align) |
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addr = COLOUR_ALIGN(addr, pgoff); |
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else |
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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 = do_align ? (PAGE_MASK & (SHMLBA - 1)) : 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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