82 lines
2.0 KiB
C
82 lines
2.0 KiB
C
// 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)
|
|
{
|
|
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.flags = 0;
|
|
info.length = len;
|
|
info.low_limit = mm->mmap_base;
|
|
info.high_limit = TASK_SIZE;
|
|
info.align_mask = 0;
|
|
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
|