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/*

 * 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

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

 */

#ifndef _ASM_X86_FIXMAP_H

#define _ASM_X86_FIXMAP_H

#ifndef __ASSEMBLY__

#include 

#include 

#include 

#include 

#include 

#ifdef CONFIG_X86_32

#include 

#include 

#else

#include 

#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)

#else

#define FIXADDR_TOP	(round_up(VSYSCALL_ADDR + PAGE_SIZE, 1<

			 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.

 * 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

 * 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,

#else

#ifdef CONFIG_X86_VSYSCALL_EMULATION

	VSYSCALL_PAGE = (FIXADDR_TOP - VSYSCALL_ADDR) >> PAGE_SHIFT,

#endif

#ifdef CONFIG_PARAVIRT_CLOCK

	PVCLOCK_FIXMAP_BEGIN,

	PVCLOCK_FIXMAP_END = PVCLOCK_FIXMAP_BEGIN+PVCLOCK_VSYSCALL_NR_PAGES-1,

#endif

#endif

	FIX_DBGP_BASE,

	FIX_EARLYCON_MEM_BASE,

#ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT

	FIX_OHCI1394_BASE,

#endif

#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

	FIX_RO_IDT,	/* Virtual mapping for read-only IDT */

#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

	FIX_TEXT_POKE1,	/* reserve 2 pages for text_poke() */

	FIX_TEXT_POKE0, /* first page is last, because allocation is backward */

#ifdef	CONFIG_X86_INTEL_MID

	FIX_LNW_VRTC,

#endif

	__end_of_permanent_fixed_addresses,

	/*

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

	 * before ioremap() is functional.

	 *

	 * If necessary we round it up to the next 512 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	8

#define TOTAL_FIX_BTMAPS	(NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS)

	FIX_BTMAP_END =

	 (__end_of_permanent_fixed_addresses ^

	  (__end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS - 1)) &

	 -PTRS_PER_PTE

	 ? __end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS -

	   (__end_of_permanent_fixed_addresses & (TOTAL_FIX_BTMAPS - 1))

	 : __end_of_permanent_fixed_addresses,

	FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1,

#ifdef CONFIG_X86_32

	FIX_WP_TEST,

#endif

#ifdef CONFIG_INTEL_TXT

	FIX_TBOOT_BASE,

#endif

	__end_of_fixed_addresses

};

extern void reserve_top_address(unsigned long reserve);

#define FIXADDR_SIZE	(__end_of_permanent_fixed_addresses << PAGE_SHIFT)

#define FIXADDR_START		(FIXADDR_TOP - FIXADDR_SIZE)

extern int fixmaps_set;

extern pte_t *kmap_pte;

extern pgprot_t kmap_prot;

extern pte_t *pkmap_page_table;

void __native_set_fixmap(enum fixed_addresses idx, pte_t pte);

void native_set_fixmap(enum fixed_addresses idx,

		       phys_addr_t phys, pgprot_t flags);

#ifndef CONFIG_PARAVIRT

static inline void __set_fixmap(enum fixed_addresses idx,

				phys_addr_t phys, pgprot_t flags)

{

	native_set_fixmap(idx, phys, flags);

}

#endif

#include 

#define __late_set_fixmap(idx, phys, flags) __set_fixmap(idx, phys, flags)

#define __late_clear_fixmap(idx) __set_fixmap(idx, 0, __pgprot(0))

void __early_set_fixmap(enum fixed_addresses idx,

			phys_addr_t phys, pgprot_t flags);

#endif /* !__ASSEMBLY__ */

#endif /* _ASM_X86_FIXMAP_H */