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