47 lines
1.1 KiB
C
47 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* arch/parisc/mm/ioremap.c
|
|
*
|
|
* (C) Copyright 1995 1996 Linus Torvalds
|
|
* (C) Copyright 2001-2019 Helge Deller <deller@gmx.de>
|
|
* (C) Copyright 2005 Kyle McMartin <kyle@parisc-linux.org>
|
|
*/
|
|
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/module.h>
|
|
#include <linux/io.h>
|
|
#include <linux/mm.h>
|
|
|
|
void __iomem *ioremap_prot(phys_addr_t phys_addr, size_t size,
|
|
unsigned long prot)
|
|
{
|
|
#ifdef CONFIG_EISA
|
|
unsigned long end = phys_addr + size - 1;
|
|
/* Support EISA addresses */
|
|
if ((phys_addr >= 0x00080000 && end < 0x000fffff) ||
|
|
(phys_addr >= 0x00500000 && end < 0x03bfffff))
|
|
phys_addr |= F_EXTEND(0xfc000000);
|
|
#endif
|
|
|
|
/*
|
|
* Don't allow anybody to remap normal RAM that we're using..
|
|
*/
|
|
if (phys_addr < virt_to_phys(high_memory)) {
|
|
char *t_addr, *t_end;
|
|
struct page *page;
|
|
|
|
t_addr = __va(phys_addr);
|
|
t_end = t_addr + (size - 1);
|
|
|
|
for (page = virt_to_page(t_addr);
|
|
page <= virt_to_page(t_end); page++) {
|
|
if(!PageReserved(page))
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
return generic_ioremap_prot(phys_addr, size, __pgprot(prot));
|
|
}
|
|
EXPORT_SYMBOL(ioremap_prot);
|