[deliverable/linux.git] / arch / x86 / include / asm / fixmap.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
 * 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 <linux/kernel.h>
#include <asm/acpi.h>
#include <asm/apicdef.h>
#include <asm/page.h>
#include <asm/pvclock.h>
#ifdef CONFIG_X86_32
#include <linux/threads.h>
#include <asm/kmap_types.h>
#else
#include <uapi/asm/vsyscall.h>
#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<<PMD_SHIFT) - \
			 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
	VSYSCALL_PAGE = (FIXADDR_TOP - VSYSCALL_ADDR) >> PAGE_SHIFT,
#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,

	/*
	 * 256 temporary boot-time mappings, used by early_ioremap(),
	 * before ioremap() is functional.
	 *
	 * If necessary 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
#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_BOOT_SIZE	(__end_of_fixed_addresses << PAGE_SHIFT)
#define FIXADDR_START		(FIXADDR_TOP - FIXADDR_SIZE)
#define FIXADDR_BOOT_START	(FIXADDR_TOP - FIXADDR_BOOT_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 <asm-generic/fixmap.h>

#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 */
Commit	Line	Data
c577b098 GP	1	/*
	2	* fixmap.h: compile-time virtual memory allocation
	3	*
	4	* This file is subject to the terms and conditions of the GNU General Public
	5	* License. See the file "COPYING" in the main directory of this archive
	6	* for more details.
	7	*
	8	* Copyright (C) 1998 Ingo Molnar
	9	*
	10	* Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
	11	* x86_32 and x86_64 integration by Gustavo F. Padovan, February 2009
	12	*/
	13
1965aae3 PA	14	#ifndef _ASM_X86_FIXMAP_H
1965aae3 PA	15	#define _ASM_X86_FIXMAP_H
3ec96783	16
c577b098 GP	17	#ifndef __ASSEMBLY__
	18	#include <linux/kernel.h>
	19	#include <asm/acpi.h>
	20	#include <asm/apicdef.h>
	21	#include <asm/page.h>
71056ae2	22	#include <asm/pvclock.h>
c577b098 GP	23	#ifdef CONFIG_X86_32
	24	#include <linux/threads.h>
	25	#include <asm/kmap_types.h>
	26	#else
f40c3300	27	#include <uapi/asm/vsyscall.h>
c577b098 GP	28	#endif
	29
	30	/*
	31	* We can't declare FIXADDR_TOP as variable for x86_64 because vsyscall
	32	* uses fixmaps that relies on FIXADDR_TOP for proper address calculation.
	33	* Because of this, FIXADDR_TOP x86 integration was left as later work.
	34	*/
	35	#ifdef CONFIG_X86_32
	36	/* used by vmalloc.c, vsyscall.lds.S.
	37	*
	38	* Leave one empty page between vmalloc'ed areas and
	39	* the start of the fixmap.
	40	*/
	41	extern unsigned long __FIXADDR_TOP;
	42	#define FIXADDR_TOP ((unsigned long)__FIXADDR_TOP)
c577b098	43	#else
f40c3300 AL	44	#define FIXADDR_TOP (round_up(VSYSCALL_ADDR + PAGE_SIZE, 1<<PMD_SHIFT) - \
f40c3300 AL	45	PAGE_SIZE)
c577b098 GP	46	#endif
	47
	48
	49	/*
	50	* Here we define all the compile-time 'special' virtual
	51	* addresses. The point is to have a constant address at
	52	* compile time, but to set the physical address only
	53	* in the boot process.
	54	* for x86_32: We allocate these special addresses
	55	* from the end of virtual memory (0xfffff000) backwards.
	56	* Also this lets us do fail-safe vmalloc(), we
	57	* can guarantee that these special addresses and
	58	* vmalloc()-ed addresses never overlap.
	59	*
	60	* These 'compile-time allocated' memory buffers are
	61	* fixed-size 4k pages (or larger if used with an increment
	62	* higher than 1). Use set_fixmap(idx,phys) to associate
	63	* physical memory with fixmap indices.
	64	*
	65	* TLB entries of such buffers will not be flushed across
	66	* task switches.
	67	*/
	68	enum fixed_addresses {
96a388de	69	#ifdef CONFIG_X86_32
c577b098	70	FIX_HOLE,
96a388de	71	#else
f40c3300	72	VSYSCALL_PAGE = (FIXADDR_TOP - VSYSCALL_ADDR) >> PAGE_SHIFT,
71056ae2 MT	73	#ifdef CONFIG_PARAVIRT_CLOCK
	74	PVCLOCK_FIXMAP_BEGIN,
	75	PVCLOCK_FIXMAP_END = PVCLOCK_FIXMAP_BEGIN+PVCLOCK_VSYSCALL_NR_PAGES-1,
cbdce7b2	76	#endif
96a388de	77	#endif
c577b098 GP	78	FIX_DBGP_BASE,
c577b098 GP	79	FIX_EARLYCON_MEM_BASE,
ff30a054 JB	80	#ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
	81	FIX_OHCI1394_BASE,
	82	#endif
c577b098 GP	83	#ifdef CONFIG_X86_LOCAL_APIC
	84	FIX_APIC_BASE, /* local (CPU) APIC) -- required for SMP or not */
	85	#endif
	86	#ifdef CONFIG_X86_IO_APIC
	87	FIX_IO_APIC_BASE_0,
	88	FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS - 1,
c577b098	89	#endif
4eefbe79	90	FIX_RO_IDT, /* Virtual mapping for read-only IDT */
c577b098 GP	91	#ifdef CONFIG_X86_32
	92	FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */
	93	FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1,
	94	#ifdef CONFIG_PCI_MMCONFIG
	95	FIX_PCIE_MCFG,
	96	#endif
	97	#endif
	98	#ifdef CONFIG_PARAVIRT
	99	FIX_PARAVIRT_BOOTMAP,
	100	#endif
12b9d7cc MD	101	FIX_TEXT_POKE1, /* reserve 2 pages for text_poke() */
12b9d7cc MD	102	FIX_TEXT_POKE0, /* first page is last, because allocation is backward */
933b9463	103	#ifdef CONFIG_X86_INTEL_MID
7309282c FT	104	FIX_LNW_VRTC,
7309282c FT	105	#endif
fa36e956 AV	106	__end_of_permanent_fixed_addresses,
fa36e956 AV	107
c577b098 GP	108	/*
	109	* 256 temporary boot-time mappings, used by early_ioremap(),
	110	* before ioremap() is functional.
	111	*
499a5f1e JB	112	* If necessary we round it up to the next 256 pages boundary so
499a5f1e JB	113	* that we can have a single pgd entry and a single pte table:
c577b098 GP	114	*/
	115	#define NR_FIX_BTMAPS 64
	116	#define FIX_BTMAPS_SLOTS 4
499a5f1e JB	117	#define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS)
	118	FIX_BTMAP_END =
	119	(__end_of_permanent_fixed_addresses ^
	120	(__end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS - 1)) &
	121	-PTRS_PER_PTE
	122	? __end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS -
	123	(__end_of_permanent_fixed_addresses & (TOTAL_FIX_BTMAPS - 1))
	124	: __end_of_permanent_fixed_addresses,
	125	FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1,
c577b098 GP	126	#ifdef CONFIG_X86_32
c577b098 GP	127	FIX_WP_TEST,
31625340 JC	128	#endif
	129	#ifdef CONFIG_INTEL_TXT
	130	FIX_TBOOT_BASE,
c577b098 GP	131	#endif
	132	__end_of_fixed_addresses
	133	};
	134
	135
	136	extern void reserve_top_address(unsigned long reserve);
	137
	138	#define FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT)
	139	#define FIXADDR_BOOT_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
	140	#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
	141	#define FIXADDR_BOOT_START (FIXADDR_TOP - FIXADDR_BOOT_SIZE)
3ec96783	142
7c7e6e07 JF	143	extern int fixmaps_set;
7c7e6e07 JF	144
fd940934 KP	145	extern pte_t *kmap_pte;
	146	extern pgprot_t kmap_prot;
	147	extern pte_t *pkmap_page_table;
	148
aeaaa59c JF	149	void __native_set_fixmap(enum fixed_addresses idx, pte_t pte);
aeaaa59c JF	150	void native_set_fixmap(enum fixed_addresses idx,
3b3809ac	151	phys_addr_t phys, pgprot_t flags);
aeaaa59c JF	152
	153	#ifndef CONFIG_PARAVIRT
	154	static inline void __set_fixmap(enum fixed_addresses idx,
3b3809ac	155	phys_addr_t phys, pgprot_t flags)
aeaaa59c JF	156	{
	157	native_set_fixmap(idx, phys, flags);
	158	}
	159	#endif
	160
114cefc8	161	#include <asm-generic/fixmap.h>
5a47c7da	162
5b7c73e0 MS	163	#define __late_set_fixmap(idx, phys, flags) __set_fixmap(idx, phys, flags)
	164	#define __late_clear_fixmap(idx) __set_fixmap(idx, 0, __pgprot(0))
	165
	166	void __early_set_fixmap(enum fixed_addresses idx,
	167	phys_addr_t phys, pgprot_t flags);
	168
c577b098	169	#endif /* !__ASSEMBLY__ */
1965aae3	170	#endif /* _ASM_X86_FIXMAP_H */