[mirror_ubuntu-hirsute-kernel.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

/*
 * Exposed to assembly code for setting up initial page tables. Cannot be
 * calculated in assembly code (fixmap entries are an enum), but is sanity
 * checked in the actual fixmap C code to make sure that the fixmap is
 * covered fully.
 */
#define FIXMAP_PMD_NUM	2
/* fixmap starts downwards from the 507th entry in level2_fixmap_pgt */
#define FIXMAP_PMD_TOP	507

#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 <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
/*
 * 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
#ifdef CONFIG_X86_VSYSCALL_EMULATION
	VSYSCALL_PAGE = (FIXADDR_TOP - VSYSCALL_ADDR) >> PAGE_SHIFT,
#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
#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
#ifdef	CONFIG_X86_INTEL_MID
	FIX_LNW_VRTC,
#endif

#ifdef CONFIG_ACPI_APEI_GHES
	/* Used for GHES mapping from assorted contexts */
	FIX_APEI_GHES_IRQ,
	FIX_APEI_GHES_NMI,
#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 pmd 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)
#define FIXADDR_TOT_SIZE	(__end_of_fixed_addresses << PAGE_SHIFT)
#define FIXADDR_TOT_START	(FIXADDR_TOP - FIXADDR_TOT_SIZE)

extern int fixmaps_set;

extern pte_t *kmap_pte;
#define kmap_prot PAGE_KERNEL
extern pte_t *pkmap_page_table;

void __native_set_fixmap(enum fixed_addresses idx, pte_t pte);
void native_set_fixmap(unsigned /* enum fixed_addresses */ idx,
		       phys_addr_t phys, pgprot_t flags);

#ifndef CONFIG_PARAVIRT_XXL
static inline void __set_fixmap(enum fixed_addresses idx,
				phys_addr_t phys, pgprot_t flags)
{
	native_set_fixmap(idx, phys, flags);
}
#endif

/*
 * FIXMAP_PAGE_NOCACHE is used for MMIO. Memory encryption is not
 * supported for MMIO addresses, so make sure that the memory encryption
 * mask is not part of the page attributes.
 */
#define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_IO_NOCACHE

/*
 * Early memremap routines used for in-place encryption. The mappings created
 * by these routines are intended to be used as temporary mappings.
 */
void __init *early_memremap_encrypted(resource_size_t phys_addr,
				      unsigned long size);
void __init *early_memremap_encrypted_wp(resource_size_t phys_addr,
					 unsigned long size);
void __init *early_memremap_decrypted(resource_size_t phys_addr,
				      unsigned long size);
void __init *early_memremap_decrypted_wp(resource_size_t phys_addr,
					 unsigned long size);

#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
05ab1d8a FT	17	/*
	18	* Exposed to assembly code for setting up initial page tables. Cannot be
	19	* calculated in assembly code (fixmap entries are an enum), but is sanity
	20	* checked in the actual fixmap C code to make sure that the fixmap is
	21	* covered fully.
	22	*/
	23	#define FIXMAP_PMD_NUM 2
	24	/* fixmap starts downwards from the 507th entry in level2_fixmap_pgt */
	25	#define FIXMAP_PMD_TOP 507
	26
c577b098 GP	27	#ifndef __ASSEMBLY__
	28	#include <linux/kernel.h>
	29	#include <asm/acpi.h>
	30	#include <asm/apicdef.h>
	31	#include <asm/page.h>
	32	#ifdef CONFIG_X86_32
	33	#include <linux/threads.h>
	34	#include <asm/kmap_types.h>
	35	#else
f40c3300	36	#include <uapi/asm/vsyscall.h>
c577b098 GP	37	#endif
	38
	39	/*
	40	* We can't declare FIXADDR_TOP as variable for x86_64 because vsyscall
	41	* uses fixmaps that relies on FIXADDR_TOP for proper address calculation.
	42	* Because of this, FIXADDR_TOP x86 integration was left as later work.
	43	*/
	44	#ifdef CONFIG_X86_32
c84b82dd	45	/*
c577b098 GP	46	* Leave one empty page between vmalloc'ed areas and
	47	* the start of the fixmap.
	48	*/
	49	extern unsigned long __FIXADDR_TOP;
	50	#define FIXADDR_TOP ((unsigned long)__FIXADDR_TOP)
c577b098	51	#else
f40c3300 AL	52	#define FIXADDR_TOP (round_up(VSYSCALL_ADDR + PAGE_SIZE, 1<<PMD_SHIFT) - \
f40c3300 AL	53	PAGE_SIZE)
c577b098 GP	54	#endif
c577b098 GP	55
c577b098 GP	56	/*
	57	* Here we define all the compile-time 'special' virtual
	58	* addresses. The point is to have a constant address at
	59	* compile time, but to set the physical address only
	60	* in the boot process.
	61	* for x86_32: We allocate these special addresses
	62	* from the end of virtual memory (0xfffff000) backwards.
	63	* Also this lets us do fail-safe vmalloc(), we
	64	* can guarantee that these special addresses and
	65	* vmalloc()-ed addresses never overlap.
	66	*
	67	* These 'compile-time allocated' memory buffers are
	68	* fixed-size 4k pages (or larger if used with an increment
	69	* higher than 1). Use set_fixmap(idx,phys) to associate
	70	* physical memory with fixmap indices.
	71	*
	72	* TLB entries of such buffers will not be flushed across
	73	* task switches.
	74	*/
	75	enum fixed_addresses {
96a388de	76	#ifdef CONFIG_X86_32
c577b098	77	FIX_HOLE,
96a388de	78	#else
1ad83c85	79	#ifdef CONFIG_X86_VSYSCALL_EMULATION
f40c3300	80	VSYSCALL_PAGE = (FIXADDR_TOP - VSYSCALL_ADDR) >> PAGE_SHIFT,
1ad83c85	81	#endif
96a388de	82	#endif
c577b098 GP	83	FIX_DBGP_BASE,
c577b098 GP	84	FIX_EARLYCON_MEM_BASE,
ff30a054 JB	85	#ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
	86	FIX_OHCI1394_BASE,
	87	#endif
c577b098 GP	88	#ifdef CONFIG_X86_LOCAL_APIC
	89	FIX_APIC_BASE, /* local (CPU) APIC) -- required for SMP or not */
	90	#endif
	91	#ifdef CONFIG_X86_IO_APIC
	92	FIX_IO_APIC_BASE_0,
	93	FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS - 1,
c577b098	94	#endif
c577b098 GP	95	#ifdef CONFIG_X86_32
	96	FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */
	97	FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1,
	98	#ifdef CONFIG_PCI_MMCONFIG
	99	FIX_PCIE_MCFG,
	100	#endif
	101	#endif
	102	#ifdef CONFIG_PARAVIRT
	103	FIX_PARAVIRT_BOOTMAP,
	104	#endif
933b9463	105	#ifdef CONFIG_X86_INTEL_MID
7309282c FT	106	FIX_LNW_VRTC,
7309282c FT	107	#endif
69218e47	108
4f89fa28 JM	109	#ifdef CONFIG_ACPI_APEI_GHES
	110	/* Used for GHES mapping from assorted contexts */
	111	FIX_APEI_GHES_IRQ,
	112	FIX_APEI_GHES_NMI,
	113	#endif
	114
fa36e956 AV	115	__end_of_permanent_fixed_addresses,
fa36e956 AV	116
c577b098	117	/*
3eddc69f	118	* 512 temporary boot-time mappings, used by early_ioremap(),
c577b098 GP	119	* before ioremap() is functional.
c577b098 GP	120	*
3eddc69f	121	* If necessary we round it up to the next 512 pages boundary so
c84b82dd	122	* that we can have a single pmd entry and a single pte table:
c577b098 GP	123	*/
c577b098 GP	124	#define NR_FIX_BTMAPS 64
3eddc69f	125	#define FIX_BTMAPS_SLOTS 8
499a5f1e JB	126	#define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS)
	127	FIX_BTMAP_END =
	128	(__end_of_permanent_fixed_addresses ^
	129	(__end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS - 1)) &
	130	-PTRS_PER_PTE
	131	? __end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS -
	132	(__end_of_permanent_fixed_addresses & (TOTAL_FIX_BTMAPS - 1))
	133	: __end_of_permanent_fixed_addresses,
	134	FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1,
c577b098 GP	135	#ifdef CONFIG_X86_32
c577b098 GP	136	FIX_WP_TEST,
31625340 JC	137	#endif
	138	#ifdef CONFIG_INTEL_TXT
	139	FIX_TBOOT_BASE,
c577b098 GP	140	#endif
	141	__end_of_fixed_addresses
	142	};
	143
	144
	145	extern void reserve_top_address(unsigned long reserve);
	146
55f49fcb WG	147	#define FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT)
	148	#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
	149	#define FIXADDR_TOT_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
	150	#define FIXADDR_TOT_START (FIXADDR_TOP - FIXADDR_TOT_SIZE)
3ec96783	151
7c7e6e07 JF	152	extern int fixmaps_set;
7c7e6e07 JF	153
fd940934	154	extern pte_t *kmap_pte;
7c360572	155	#define kmap_prot PAGE_KERNEL
fd940934 KP	156	extern pte_t *pkmap_page_table;
fd940934 KP	157
aeaaa59c	158	void __native_set_fixmap(enum fixed_addresses idx, pte_t pte);
f53e2cd0	159	void native_set_fixmap(unsigned /* enum fixed_addresses */ idx,
3b3809ac	160	phys_addr_t phys, pgprot_t flags);
aeaaa59c	161
fdc0269e	162	#ifndef CONFIG_PARAVIRT_XXL
aeaaa59c	163	static inline void __set_fixmap(enum fixed_addresses idx,
3b3809ac	164	phys_addr_t phys, pgprot_t flags)
aeaaa59c JF	165	{
	166	native_set_fixmap(idx, phys, flags);
	167	}
	168	#endif
	169
21729f81 TL	170	/*
	171	* FIXMAP_PAGE_NOCACHE is used for MMIO. Memory encryption is not
	172	* supported for MMIO addresses, so make sure that the memory encryption
	173	* mask is not part of the page attributes.
	174	*/
	175	#define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_IO_NOCACHE
	176
f88a68fa TL	177	/*
	178	* Early memremap routines used for in-place encryption. The mappings created
	179	* by these routines are intended to be used as temporary mappings.
	180	*/
	181	void __init *early_memremap_encrypted(resource_size_t phys_addr,
	182	unsigned long size);
	183	void __init *early_memremap_encrypted_wp(resource_size_t phys_addr,
	184	unsigned long size);
	185	void __init *early_memremap_decrypted(resource_size_t phys_addr,
	186	unsigned long size);
	187	void __init *early_memremap_decrypted_wp(resource_size_t phys_addr,
	188	unsigned long size);
	189
114cefc8	190	#include <asm-generic/fixmap.h>
5a47c7da	191
5b7c73e0 MS	192	#define __late_set_fixmap(idx, phys, flags) __set_fixmap(idx, phys, flags)
	193	#define __late_clear_fixmap(idx) __set_fixmap(idx, 0, __pgprot(0))
	194
	195	void __early_set_fixmap(enum fixed_addresses idx,
	196	phys_addr_t phys, pgprot_t flags);
	197
c577b098	198	#endif /* !__ASSEMBLY__ */
1965aae3	199	#endif /* _ASM_X86_FIXMAP_H */