x86: EFI_PAGE_SHIFT fix
Make x86 EFI code works when EFI_PAGE_SHIFT != PAGE_SHIFT. The
memrage_efi_to_native() provided in this patch can be used on other
EFI platform such as IA64 too.
This patch has been tested on Intel x86_64 platform with EFI 64/32
firmware.
Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
diff --git a/arch/x86/kernel/efi_64.c b/arch/x86/kernel/efi_64.c
index d143a1e..d0060fd 100644
--- a/arch/x86/kernel/efi_64.c
+++ b/arch/x86/kernel/efi_64.c
@@ -105,14 +105,14 @@
void __iomem * __init efi_ioremap(unsigned long phys_addr, unsigned long size)
{
- static unsigned pages_mapped;
+ static unsigned pages_mapped __initdata;
unsigned i, pages;
+ unsigned long offset;
- /* phys_addr and size must be page aligned */
- if ((phys_addr & ~PAGE_MASK) || (size & ~PAGE_MASK))
- return NULL;
+ pages = PFN_UP(phys_addr + size) - PFN_DOWN(phys_addr);
+ offset = phys_addr & ~PAGE_MASK;
+ phys_addr &= PAGE_MASK;
- pages = size >> PAGE_SHIFT;
if (pages_mapped + pages > MAX_EFI_IO_PAGES)
return NULL;
@@ -124,5 +124,5 @@
}
return (void __iomem *)__fix_to_virt(FIX_EFI_IO_MAP_FIRST_PAGE - \
- (pages_mapped - pages));
+ (pages_mapped - pages)) + offset;
}