2 * (c) Copyright 2006 Hewlett-Packard Development Company, L.P.
3 * Bjorn Helgaas <bjorn.helgaas@hp.com>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
10 #include <linux/compiler.h>
11 #include <linux/module.h>
12 #include <linux/efi.h>
14 #include <asm/meminit.h>
16 static inline void __iomem *
17 __ioremap (unsigned long offset, unsigned long size)
20 offset = HYPERVISOR_ioremap(offset, size);
22 return (void __iomem *) (__IA64_UNCACHED_OFFSET | offset);
26 ioremap (unsigned long offset, unsigned long size)
29 unsigned long gran_base, gran_size;
32 * For things in kern_memmap, we must use the same attribute
33 * as the rest of the kernel. For more details, see
34 * Documentation/ia64/aliasing.txt.
36 attr = kern_mem_attribute(offset, size);
37 if (attr & EFI_MEMORY_WB)
38 return (void __iomem *) phys_to_virt(offset);
39 else if (attr & EFI_MEMORY_UC)
40 return __ioremap(offset, size);
43 * Some chipsets don't support UC access to memory. If
44 * WB is supported for the whole granule, we prefer that.
46 gran_base = GRANULEROUNDDOWN(offset);
47 gran_size = GRANULEROUNDUP(offset + size) - gran_base;
48 if (efi_mem_attribute(gran_base, gran_size) & EFI_MEMORY_WB)
49 return (void __iomem *) phys_to_virt(offset);
51 return __ioremap(offset, size);
53 EXPORT_SYMBOL(ioremap);
56 ioremap_nocache (unsigned long offset, unsigned long size)
58 if (kern_mem_attribute(offset, size) & EFI_MEMORY_WB)
61 return __ioremap(offset, size);
63 EXPORT_SYMBOL(ioremap_nocache);