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
16 void __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 }
46 EXPORT_SYMBOL(ioremap_prot);
47
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