// SPDX-License-Identifier: GPL-2.0-only
/*
 * ARC700 mmap
 *
 * (started from arm version - for VIPT alias handling)
 *
 * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
 */

#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/sched/mm.h>

#include <asm/cacheflush.h>

/*
 * Ensure that shared mappings are correctly aligned to
 * avoid aliasing issues with VIPT caches.
 * We need to ensure that
 * a specific page of an object is always mapped at a multiple of
 * SHMLBA bytes.
 */
unsigned long
arch_get_unmapped_area(struct file *filp, unsigned long addr,
                unsigned long len, unsigned long pgoff,
                unsigned long flags, vm_flags_t vm_flags)
{
        struct mm_struct *mm = current->mm;
        struct vm_area_struct *vma;
        struct vm_unmapped_area_info info = {};

        /*
         * We enforce the MAP_FIXED case.
         */
        if (flags & MAP_FIXED) {
                if (flags & MAP_SHARED &&
                    (addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1))
                        return -EINVAL;
                return addr;
        }

        if (len > TASK_SIZE)
                return -ENOMEM;

        if (addr) {
                addr = PAGE_ALIGN(addr);

                vma = find_vma(mm, addr);
                if (TASK_SIZE - len >= addr &&
                    (!vma || addr + len <= vm_start_gap(vma)))
                        return addr;
        }

        info.length = len;
        info.low_limit = mm->mmap_base;
        info.high_limit = TASK_SIZE;
        info.align_offset = pgoff << PAGE_SHIFT;
        return vm_unmapped_area(&info);
}

static const pgprot_t protection_map[16] = {
        [VM_NONE]                                       = PAGE_U_NONE,
        [VM_READ]                                       = PAGE_U_R,
        [VM_WRITE]                                      = PAGE_U_R,
        [VM_WRITE | VM_READ]                            = PAGE_U_R,
        [VM_EXEC]                                       = PAGE_U_X_R,
        [VM_EXEC | VM_READ]                             = PAGE_U_X_R,
        [VM_EXEC | VM_WRITE]                            = PAGE_U_X_R,
        [VM_EXEC | VM_WRITE | VM_READ]                  = PAGE_U_X_R,
        [VM_SHARED]                                     = PAGE_U_NONE,
        [VM_SHARED | VM_READ]                           = PAGE_U_R,
        [VM_SHARED | VM_WRITE]                          = PAGE_U_W_R,
        [VM_SHARED | VM_WRITE | VM_READ]                = PAGE_U_W_R,
        [VM_SHARED | VM_EXEC]                           = PAGE_U_X_R,
        [VM_SHARED | VM_EXEC | VM_READ]                 = PAGE_U_X_R,
        [VM_SHARED | VM_EXEC | VM_WRITE]                = PAGE_U_X_W_R,
        [VM_SHARED | VM_EXEC | VM_WRITE | VM_READ]      = PAGE_U_X_W_R
};
DECLARE_VM_GET_PAGE_PROT