1// SPDX-License-Identifier: GPL-2.0
2/*
3 * arch/parisc/mm/ioremap.c
4 *
5 * (C) Copyright 1995 1996 Linus Torvalds
6 * (C) Copyright 2001-2019 Helge Deller <deller@gmx.de>
7 * (C) Copyright 2005 Kyle McMartin <kyle@parisc-linux.org>
8 */
9
10#include <linux/vmalloc.h>
11#include <linux/errno.h>
12#include <linux/module.h>
13#include <linux/io.h>
14#include <linux/mm.h>
15
16void __iomem *ioremap_prot(phys_addr_t phys_addr, size_t size,
17			   unsigned long prot)
18{
19#ifdef CONFIG_EISA
20	unsigned long end = phys_addr + size - 1;
21	/* Support EISA addresses */
22	if ((phys_addr >= 0x00080000 && end < 0x000fffff) ||
23	    (phys_addr >= 0x00500000 && end < 0x03bfffff))
24		phys_addr |= F_EXTEND(0xfc000000);
25#endif
26
27	/*
28	 * Don't allow anybody to remap normal RAM that we're using..
29	 */
30	if (phys_addr < virt_to_phys(high_memory)) {
31		char *t_addr, *t_end;
32		struct page *page;
33
34		t_addr = __va(phys_addr);
35		t_end = t_addr + (size - 1);
36
37		for (page = virt_to_page(t_addr);
38		     page <= virt_to_page(t_end); page++) {
39			if(!PageReserved(page))
40				return NULL;
41		}
42	}
43
44	return generic_ioremap_prot(phys_addr, size, __pgprot(prot));
45}
46EXPORT_SYMBOL(ioremap_prot);
47