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Commit c78f322c authored by Gustavo Padovan's avatar Gustavo Padovan Committed by H. Peter Anvin
Browse files

x86, fixmap: prepare fixmap_32.h for unification 



Impact: cleanup

Just prepare fixmap for later mechanic unification.
No real modification on code.

   text    data     bss     dec     hex filename
3831152  353188  372736 4557076  458914 vmlinux-32.after
3831152  353188  372736 4557076  458914 vmlinux-32.before

Signed-off-by: default avatarGustavo F. Padovan <gustavo@las.ic.unicamp.br>
Acked-by: default avatarGlauber Costa <gcosta@redhat.com>
Signed-off-by: default avatarH. Peter Anvin <hpa@zytor.com>
parent e365bcd9

arch/x86/include/asm/fixmap_32.h

+56 −17
Original line number Diff line number Diff line
@@ -8,50 +8,80 @@ 
 * Copyright (C) 1998 Ingo Molnar

 *

 * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999

 * x86_32 and x86_64 integration by Gustavo F. Padovan, February 2009

 */



#ifndef _ASM_X86_FIXMAP_32_H

#define _ASM_X86_FIXMAP_32_H



#ifndef __ASSEMBLY__

#include <linux/kernel.h>

#include <asm/acpi.h>

#include <asm/apicdef.h>

#include <asm/page.h>

#ifdef CONFIG_X86_32

#include <linux/threads.h>

#include <asm/kmap_types.h>

#else

#include <asm/vsyscall.h>

#ifdef CONFIG_EFI

#include <asm/efi.h>

#endif

#endif



/*

 * We can't declare FIXADDR_TOP as variable for x86_64 because vsyscall

 * uses fixmaps that relies on FIXADDR_TOP for proper address calculation.

 * Because of this, FIXADDR_TOP x86 integration was left as later work.

 */

#ifdef CONFIG_X86_32

/* used by vmalloc.c, vsyscall.lds.S.

 *

 * Leave one empty page between vmalloc'ed areas and

 * the start of the fixmap.

 */

extern unsigned long __FIXADDR_TOP;

#define FIXADDR_TOP	((unsigned long)__FIXADDR_TOP)



#define FIXADDR_USER_START     __fix_to_virt(FIX_VDSO)

#define FIXADDR_USER_END       __fix_to_virt(FIX_VDSO - 1)

#else

#define FIXADDR_TOP	(VSYSCALL_END-PAGE_SIZE)



#ifndef __ASSEMBLY__

#include <linux/kernel.h>

#include <asm/acpi.h>

#include <asm/apicdef.h>

#include <asm/page.h>

#include <linux/threads.h>

#include <asm/kmap_types.h>

/* Only covers 32bit vsyscalls currently. Need another set for 64bit. */

#define FIXADDR_USER_START	((unsigned long)VSYSCALL32_VSYSCALL)

#define FIXADDR_USER_END	(FIXADDR_USER_START + PAGE_SIZE)

#endif



/*

 * Here we define all the compile-time 'special' virtual

 * addresses. The point is to have a constant address at

 * compile time, but to set the physical address only

 * in the boot process. We allocate these special addresses

 * in the boot process.

 * for x86_32: We allocate these special addresses

 * from the end of virtual memory (0xfffff000) backwards.

 * Also this lets us do fail-safe vmalloc(), we

 * can guarantee that these special addresses and

 * vmalloc()-ed addresses never overlap.

 *

 * these 'compile-time allocated' memory buffers are

 * fixed-size 4k pages. (or larger if used with an increment

 * highger than 1) use fixmap_set(idx,phys) to associate

 * These 'compile-time allocated' memory buffers are

 * fixed-size 4k pages (or larger if used with an increment

 * higher than 1). Use set_fixmap(idx,phys) to associate

 * physical memory with fixmap indices.

 *

 * TLB entries of such buffers will not be flushed across

 * task switches.

 */

enum fixed_addresses {

#ifdef CONFIG_X86_32

	FIX_HOLE,

	FIX_VDSO,

#else

	VSYSCALL_LAST_PAGE,

	VSYSCALL_FIRST_PAGE = VSYSCALL_LAST_PAGE

			    + ((VSYSCALL_END-VSYSCALL_START) >> PAGE_SHIFT) - 1,

	VSYSCALL_HPET,

#endif

	FIX_DBGP_BASE,

	FIX_EARLYCON_MEM_BASE,

#ifdef CONFIG_X86_LOCAL_APIC
@@ -61,6 +91,13 @@ enum fixed_addresses { 
	FIX_IO_APIC_BASE_0,

	FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS - 1,

#endif

#ifdef CONFIG_X86_64

#ifdef CONFIG_EFI

	FIX_EFI_IO_MAP_LAST_PAGE,

	FIX_EFI_IO_MAP_FIRST_PAGE = FIX_EFI_IO_MAP_LAST_PAGE

				  + MAX_EFI_IO_PAGES - 1,

#endif

#endif

#ifdef CONFIG_X86_VISWS_APIC

	FIX_CO_CPU,	/* Cobalt timer */

	FIX_CO_APIC,	/* Cobalt APIC Redirection Table */
@@ -73,15 +110,20 @@ enum fixed_addresses { 
#ifdef CONFIG_X86_CYCLONE_TIMER

	FIX_CYCLONE_TIMER, /*cyclone timer register*/

#endif

#ifdef CONFIG_X86_32

	FIX_KMAP_BEGIN,	/* reserved pte's for temporary kernel mappings */

	FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1,

#ifdef CONFIG_PCI_MMCONFIG

	FIX_PCIE_MCFG,

#endif

#endif

#ifdef CONFIG_PARAVIRT

	FIX_PARAVIRT_BOOTMAP,

#endif

	__end_of_permanent_fixed_addresses,

#ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT

	FIX_OHCI1394_BASE,

#endif

	/*

	 * 256 temporary boot-time mappings, used by early_ioremap(),

	 * before ioremap() is functional.
@@ -94,17 +136,14 @@ enum fixed_addresses { 
	FIX_BTMAP_END = __end_of_permanent_fixed_addresses + 256 -

			(__end_of_permanent_fixed_addresses & 255),

	FIX_BTMAP_BEGIN = FIX_BTMAP_END + NR_FIX_BTMAPS*FIX_BTMAPS_SLOTS - 1,

#ifdef CONFIG_X86_32

	FIX_WP_TEST,

#ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT

	FIX_OHCI1394_BASE,

#endif

	__end_of_fixed_addresses

};



extern void reserve_top_address(unsigned long reserve);





#define FIXADDR_TOP	((unsigned long)__FIXADDR_TOP)

extern void reserve_top_address(unsigned long reserve);



#define FIXADDR_SIZE	(__end_of_permanent_fixed_addresses << PAGE_SHIFT)

#define FIXADDR_BOOT_SIZE	(__end_of_fixed_addresses << PAGE_SHIFT)