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>

diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index 3cff3c8..30b046b 100644 (file)
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -160,6 +160,7 @@ KBUILD_AFLAGS += $(mflags-y)
 
 head-y := arch/x86/kernel/head_$(BITS).o
 head-y += arch/x86/kernel/head$(BITS).o
+head-y += arch/x86/kernel/head.o
 head-y += arch/x86/kernel/init_task.o
 
 libs-y  += arch/x86/lib/

diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index 5369a4e..7e01ce3 100644 (file)
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -2,7 +2,7 @@
 # Makefile for the linux kernel.
 #
 
-extra-y                := head_$(BITS).o head$(BITS).o init_task.o vmlinux.lds
+extra-y                := head_$(BITS).o head$(BITS).o head.o init_task.o vmlinux.lds
 
 CPPFLAGS_vmlinux.lds += -U$(UTS_MACHINE)
 

diff --git a/arch/x86/kernel/head.c b/arch/x86/kernel/head.c
new file mode 100644 (file)
index 0000000..e0d0ce5
--- /dev/null
+++ b/arch/x86/kernel/head.c
@@ -0,0 +1,55 @@
+#include <linux/kernel.h>
+#include <linux/init.h>
+
+#include <asm/setup.h>
+#include <asm/bios_ebda.h>
+
+#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.
+ */
+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");
+}

diff --git a/arch/x86/kernel/head32.c b/arch/x86/kernel/head32.c
index 0b6cb9f..fa1d25d 100644 (file)
--- a/arch/x86/kernel/head32.c
+++ b/arch/x86/kernel/head32.c
@@ -13,56 +13,6 @@
 #include <asm/e820.h>
 #include <asm/bios_ebda.h>
 
-#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");
-}
-
 void __init i386_start_kernel(void)
 {
        reserve_early(__pa_symbol(&_text), __pa_symbol(&_end), "TEXT DATA BSS");

diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index e25c57b..f1773c8 100644 (file)
--- 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;

diff --git a/include/asm-x86/bios_ebda.h b/include/asm-x86/bios_ebda.h
index b4a46b7..0033e50 100644 (file)
--- a/include/asm-x86/bios_ebda.h
+++ b/include/asm-x86/bios_ebda.h
@@ -14,4 +14,6 @@ static inline unsigned int get_bios_ebda(void)
        return address; /* 0 means none */
 }
 
+void reserve_ebda_region(void);
+
 #endif /* _MACH_BIOS_EBDA_H */