x86: extract common part of head32.c and head64.c into head.c

This patch extracts the common part of head32.c and head64.c into head.c.

Signed-off-by: Huang Ying <ying.huang@intel.com>
Cc: andi@firstfloor.org
Cc: mingo@redhat.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 0 insertions, 50 deletions

diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index e25c57b8aa84..f1773c8ee21e 100644
--- a/arch/x86/kernel/head64.c
+++ b/arch/x86/kernel/head64.c
@@ -51,56 +51,6 @@ static void __init copy_bootdata(char *real_mode_data)
         }
 }
 
-#define BIOS_LOWMEM_KILOBYTES 0x413
-
-/*
- * The BIOS places the EBDA/XBDA at the top of conventional
- * memory, and usually decreases the reported amount of
- * conventional memory (int 0x12) too. This also contains a
- * workaround for Dell systems that neglect to reserve EBDA.
- * The same workaround also avoids a problem with the AMD768MPX
- * chipset: reserve a page before VGA to prevent PCI prefetch
- * into it (errata #56). Usually the page is reserved anyways,
- * unless you have no PS/2 mouse plugged in.
- */
-static void __init reserve_ebda_region(void)
-{
-        unsigned int lowmem, ebda_addr;
-
-        /* To determine the position of the EBDA and the */
-        /* end of conventional memory, we need to look at */
-        /* the BIOS data area. In a paravirtual environment */
-        /* that area is absent. We'll just have to assume */
-        /* that the paravirt case can handle memory setup */
-        /* correctly, without our help. */
-        if (paravirt_enabled())
-                return;
-
-        /* end of low (conventional) memory */
-        lowmem = *(unsigned short *)__va(BIOS_LOWMEM_KILOBYTES);
-        lowmem <<= 10;
-
-        /* start of EBDA area */
-        ebda_addr = get_bios_ebda();
-
-        /* Fixup: bios puts an EBDA in the top 64K segment */
-        /* of conventional memory, but does not adjust lowmem. */
-        if ((lowmem - ebda_addr) <= 0x10000)
-                lowmem = ebda_addr;
-
-        /* Fixup: bios does not report an EBDA at all. */
-        /* Some old Dells seem to need 4k anyhow (bugzilla 2990) */
-        if ((ebda_addr == 0) && (lowmem >= 0x9f000))
-                lowmem = 0x9f000;
-
-        /* Paranoia: should never happen, but... */
-        if ((lowmem == 0) || (lowmem >= 0x100000))
-                lowmem = 0x9f000;
-
-        /* reserve all memory between lowmem and the 1MB mark */
-        reserve_early(lowmem, 0x100000, "BIOS reserved");
-}
-
 static void __init reserve_setup_data(void)
 {
         struct setup_data *data;