arch/x86/include/asm/fixmap_32.h

/*
 * fixmap.h: compile-time virtual memory allocation
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1998 Ingo Molnar
 *
 * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
 */

#ifndef _ASM_X86_FIXMAP_32_H
#define _ASM_X86_FIXMAP_32_H


/* 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_USER_START     __fix_to_virt(FIX_VDSO)
#define FIXADDR_USER_END       __fix_to_virt(FIX_VDSO - 1)

#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>

/*
 * 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
 * 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
 * physical memory with fixmap indices.
 *
 * TLB entries of such buffers will not be flushed across
 * task switches.
 */
enum fixed_addresses {
	FIX_HOLE,
	FIX_VDSO,
	FIX_DBGP_BASE,
	FIX_EARLYCON_MEM_BASE,
#ifdef CONFIG_X86_LOCAL_APIC
	FIX_APIC_BASE,	/* local (CPU) APIC) -- required for SMP or not */
#endif
#ifdef CONFIG_X86_IO_APIC
	FIX_IO_APIC_BASE_0,
	FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS-1,
#endif
#ifdef CONFIG_X86_VISWS_APIC
	FIX_CO_CPU,	/* Cobalt timer */
	FIX_CO_APIC,	/* Cobalt APIC Redirection Table */
	FIX_LI_PCIA,	/* Lithium PCI Bridge A */
	FIX_LI_PCIB,	/* Lithium PCI Bridge B */
#endif
#ifdef CONFIG_X86_F00F_BUG
	FIX_F00F_IDT,	/* Virtual mapping for IDT */
#endif
#ifdef CONFIG_X86_CYCLONE_TIMER
	FIX_CYCLONE_TIMER, /*cyclone timer register*/
#endif
	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
#ifdef CONFIG_PARAVIRT
	FIX_PARAVIRT_BOOTMAP,
#endif
	__end_of_permanent_fixed_addresses,
	/*
	 * 256 temporary boot-time mappings, used by early_ioremap(),
	 * before ioremap() is functional.
	 *
	 * We round it up to the next 256 pages boundary so that we
	 * can have a single pgd entry and a single pte table:
	 */
#define NR_FIX_BTMAPS		64
#define FIX_BTMAPS_SLOTS	4
	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,
	FIX_WP_TEST,
#ifdef CONFIG_ACPI
	FIX_ACPI_BEGIN,
	FIX_ACPI_END = FIX_ACPI_BEGIN + FIX_ACPI_PAGES - 1,
#endif
#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)

#define __FIXADDR_SIZE	(__end_of_permanent_fixed_addresses << PAGE_SHIFT)
#define __FIXADDR_BOOT_SIZE	(__end_of_fixed_addresses << PAGE_SHIFT)
#define FIXADDR_START		(FIXADDR_TOP - __FIXADDR_SIZE)
#define FIXADDR_BOOT_START	(FIXADDR_TOP - __FIXADDR_BOOT_SIZE)

#endif /* !__ASSEMBLY__ */
#endif /* _ASM_X86_FIXMAP_32_H */