[mirror_ubuntu-zesty-kernel.git] / arch / arm64 / 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
 * Copyright (C) 2013 Mark Salter <msalter@redhat.com>
 *
 * Adapted from arch/x86 version.
 *
 */

#ifndef _ASM_ARM64_FIXMAP_H
#define _ASM_ARM64_FIXMAP_H

#ifndef __ASSEMBLY__
#include <linux/kernel.h>
#include <linux/sizes.h>
#include <asm/boot.h>
#include <asm/page.h>
#include <asm/pgtable-prot.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.
 *
 * These 'compile-time allocated' memory buffers are
 * page-sized. Use set_fixmap(idx,phys) to associate
 * physical memory with fixmap indices.
 *
 */
enum fixed_addresses {
	FIX_HOLE,

	/*
	 * Reserve a virtual window for the FDT that is 2 MB larger than the
	 * maximum supported size, and put it at the top of the fixmap region.
	 * The additional space ensures that any FDT that does not exceed
	 * MAX_FDT_SIZE can be mapped regardless of whether it crosses any
	 * 2 MB alignment boundaries.
	 *
	 * Keep this at the top so it remains 2 MB aligned.
	 */
#define FIX_FDT_SIZE		(MAX_FDT_SIZE + SZ_2M)
	FIX_FDT_END,
	FIX_FDT = FIX_FDT_END + FIX_FDT_SIZE / PAGE_SIZE - 1,

	FIX_EARLYCON_MEM_BASE,
	FIX_TEXT_POKE0,
	__end_of_permanent_fixed_addresses,

	/*
	 * Temporary boot-time mappings, used by early_ioremap(),
	 * before ioremap() is functional.
	 */
#define NR_FIX_BTMAPS		(SZ_256K / PAGE_SIZE)
#define FIX_BTMAPS_SLOTS	7
#define TOTAL_FIX_BTMAPS	(NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS)

	FIX_BTMAP_END = __end_of_permanent_fixed_addresses,
	FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1,

	/*
	 * Used for kernel page table creation, so unmapped memory may be used
	 * for tables.
	 */
	FIX_PTE,
	FIX_PMD,
	FIX_PUD,
	FIX_PGD,

	__end_of_fixed_addresses
};

#define FIXADDR_SIZE	(__end_of_permanent_fixed_addresses << PAGE_SHIFT)
#define FIXADDR_START	(FIXADDR_TOP - FIXADDR_SIZE)

#define FIXMAP_PAGE_IO     __pgprot(PROT_DEVICE_nGnRE)

void __init early_fixmap_init(void);

#define __early_set_fixmap __set_fixmap

#define __late_set_fixmap __set_fixmap
#define __late_clear_fixmap(idx) __set_fixmap((idx), 0, FIXMAP_PAGE_CLEAR)

extern void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot);

#include <asm-generic/fixmap.h>

#endif /* !__ASSEMBLY__ */
#endif /* _ASM_ARM64_FIXMAP_H */
Commit	Line	Data
bf4b558e MS	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	* Copyright (C) 2013 Mark Salter <msalter@redhat.com>
	10	*
5d3c2c35	11	* Adapted from arch/x86 version.
bf4b558e MS	12	*
	13	*/
	14
	15	#ifndef _ASM_ARM64_FIXMAP_H
	16	#define _ASM_ARM64_FIXMAP_H
	17
	18	#ifndef __ASSEMBLY__
	19	#include <linux/kernel.h>
e25781e3	20	#include <linux/sizes.h>
61bd93ce	21	#include <asm/boot.h>
bf4b558e	22	#include <asm/page.h>
3eca86e7	23	#include <asm/pgtable-prot.h>
bf4b558e MS	24
	25	/*
	26	* Here we define all the compile-time 'special' virtual
	27	* addresses. The point is to have a constant address at
	28	* compile time, but to set the physical address only
	29	* in the boot process.
	30	*
	31	* These 'compile-time allocated' memory buffers are
	32	* page-sized. Use set_fixmap(idx,phys) to associate
	33	* physical memory with fixmap indices.
	34	*
	35	*/
	36	enum fixed_addresses {
dab78b6d	37	FIX_HOLE,
61bd93ce AB	38
	39	/*
	40	* Reserve a virtual window for the FDT that is 2 MB larger than the
	41	* maximum supported size, and put it at the top of the fixmap region.
	42	* The additional space ensures that any FDT that does not exceed
	43	* MAX_FDT_SIZE can be mapped regardless of whether it crosses any
	44	* 2 MB alignment boundaries.
	45	*
	46	* Keep this at the top so it remains 2 MB aligned.
	47	*/
	48	#define FIX_FDT_SIZE (MAX_FDT_SIZE + SZ_2M)
	49	FIX_FDT_END,
	50	FIX_FDT = FIX_FDT_END + FIX_FDT_SIZE / PAGE_SIZE - 1,
	51
bf4b558e	52	FIX_EARLYCON_MEM_BASE,
19fc5775	53	FIX_TEXT_POKE0,
bf4b558e MS	54	__end_of_permanent_fixed_addresses,
	55
	56	/*
	57	* Temporary boot-time mappings, used by early_ioremap(),
	58	* before ioremap() is functional.
	59	*/
e25781e3	60	#define NR_FIX_BTMAPS (SZ_256K / PAGE_SIZE)
bf4b558e MS	61	#define FIX_BTMAPS_SLOTS 7
	62	#define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS)
	63
	64	FIX_BTMAP_END = __end_of_permanent_fixed_addresses,
	65	FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1,
961faac1 MR	66
	67	/*
	68	* Used for kernel page table creation, so unmapped memory may be used
	69	* for tables.
	70	*/
	71	FIX_PTE,
	72	FIX_PMD,
	73	FIX_PUD,
	74	FIX_PGD,
	75
bf4b558e MS	76	__end_of_fixed_addresses
	77	};
	78
	79	#define FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT)
	80	#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
	81
	82	#define FIXMAP_PAGE_IO __pgprot(PROT_DEVICE_nGnRE)
	83
af86e597	84	void __init early_fixmap_init(void);
bf4b558e	85
af86e597 LA	86	#define __early_set_fixmap __set_fixmap
af86e597 LA	87
b2cedba0 MS	88	#define __late_set_fixmap __set_fixmap
	89	#define __late_clear_fixmap(idx) __set_fixmap((idx), 0, FIXMAP_PAGE_CLEAR)
	90
af86e597	91	extern void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot);
bf4b558e MS	92
	93	#include <asm-generic/fixmap.h>
	94
	95	#endif /* !__ASSEMBLY__ */
	96	#endif /* _ASM_ARM64_FIXMAP_H */