x86: use get_bios_ebda()

Use get_bios_ebda().
Signed-off-by: NAkinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

arch/x86/kernel/head64.c

@@ -22,6 +22,7 @@
 #include <asm/sections.h>
 #include <asm/kdebug.h>
 #include <asm/e820.h>
+#include <asm/bios_ebda.h>
 
 static void __init zap_identity_mappings(void)
 {
@@ -49,7 +50,6 @@ static void __init copy_bootdata(char *real_mode_data)
 	}
 }
 
-#define BIOS_EBDA_SEGMENT 0x40E
 #define BIOS_LOWMEM_KILOBYTES 0x413
 
 /*
@@ -80,8 +80,7 @@ static void __init reserve_ebda_region(void)
 	lowmem <<= 10;
 
 	/* start of EBDA area */
-	ebda_addr = *(unsigned short *)__va(BIOS_EBDA_SEGMENT);
-	ebda_addr <<= 4;
+	ebda_addr = get_bios_ebda();
 
 	/* Fixup: bios puts an EBDA in the top 64K segment */
 	/* of conventional memory, but does not adjust lowmem. */

arch/x86/kernel/setup_32.c

@@ -389,7 +389,6 @@ unsigned long __init find_max_low_pfn(void)
 	return max_low_pfn;
 }
 
-#define BIOS_EBDA_SEGMENT 0x40E
 #define BIOS_LOWMEM_KILOBYTES 0x413
 
 /*
@@ -420,8 +419,7 @@ static void __init reserve_ebda_region(void)
 	lowmem <<= 10;
 
 	/* start of EBDA area */
-	ebda_addr = *(unsigned short *)__va(BIOS_EBDA_SEGMENT);
-	ebda_addr <<= 4;
+	ebda_addr = get_bios_ebda();
 
 	/* Fixup: bios puts an EBDA in the top 64K segment */
 	/* of conventional memory, but does not adjust lowmem. */

arch/x86/kernel/summit_32.c

@@ -29,6 +29,7 @@
 #include <linux/mm.h>
 #include <linux/init.h>
 #include <asm/io.h>
+#include <asm/bios_ebda.h>
 #include <asm/mach-summit/mach_mpparse.h>
 
 static struct rio_table_hdr *rio_table_hdr __initdata;
@@ -140,8 +141,8 @@ void __init setup_summit(void)
 	int			i, next_wpeg, next_bus = 0;
 
 	/* The pointer to the EBDA is stored in the word @ phys 0x40E(40:0E) */
-	ptr = *(unsigned short *)phys_to_virt(0x40Eul);
-	ptr = (unsigned long)phys_to_virt(ptr << 4);
+	ptr = get_bios_ebda();
+	ptr = (unsigned long)phys_to_virt(ptr);
 
 	rio_table_hdr = NULL;
 	offset = 0x180;