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x86: EFI_PAGE_SHIFT fix

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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>
This commit is contained in:
Huang, Ying 2008-02-25 15:18:37 +08:00 • committed by Ingo Molnar
parent f8dfd5ed14
commit 4a3575fd43
3 changed files with 26 additions and 11 deletions
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7
include/linux/efi.h
View file

@ -18,6 +18,7 @@
#include <linux/proc_fs.h>
#include <linux/rtc.h>
#include <linux/ioport.h>
#include <linux/pfn.h>
#include <asm/page.h>
#include <asm/system.h>
@ -394,4 +395,10 @@ struct efi_generic_dev_path {
u16 length;
} __attribute ((packed));
static inline void memrange_efi_to_native(u64 *addr, u64 *npages)
{
*npages = PFN_UP(*addr + (*npages<<EFI_PAGE_SHIFT)) - PFN_DOWN(*addr);
*addr &= PAGE_MASK;
}
#endif /* _LINUX_EFI_H */