Commit 0c51a965 authored by Huang, Ying's avatar Huang, Ying Committed by Thomas Gleixner
Browse files

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: default avatarHuang Ying <ying.huang@intel.com>
Cc: andi@firstfloor.org
Cc: mingo@redhat.com
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent ecacf09f

arch/x86/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -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/

arch/x86/kernel/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -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)

arch/x86/kernel/head.c

0 → 100644
+55 −0
Original line number Diff line number Diff line 
#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");

}

arch/x86/kernel/head32.c

+0 −50
Original line number Diff line number Diff line
@@ -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");

arch/x86/kernel/head64.c

+0 −50
Original line number Diff line number Diff line
@@ -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;

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