// 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,
                           pgprot_t 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, prot);
}
EXPORT_SYMBOL(ioremap_prot);