[linux-2.6-block.git] / arch / arm64 / include / asm / memory.h

/*
 * Based on arch/arm/include/asm/memory.h
 *
 * Copyright (C) 2000-2002 Russell King
 * Copyright (C) 2012 ARM Ltd.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * Note: this file should not be included by non-asm/.h files
 */
#ifndef __ASM_MEMORY_H
#define __ASM_MEMORY_H

#include <linux/compiler.h>
#include <linux/const.h>
#include <linux/types.h>
#include <asm/bug.h>
#include <asm/sizes.h>

/*
 * Allow for constants defined here to be used from assembly code
 * by prepending the UL suffix only with actual C code compilation.
 */
#define UL(x) _AC(x, UL)

/*
 * Size of the PCI I/O space. This must remain a power of two so that
 * IO_SPACE_LIMIT acts as a mask for the low bits of I/O addresses.
 */
#define PCI_IO_SIZE		SZ_16M

/*
 * Log2 of the upper bound of the size of a struct page. Used for sizing
 * the vmemmap region only, does not affect actual memory footprint.
 * We don't use sizeof(struct page) directly since taking its size here
 * requires its definition to be available at this point in the inclusion
 * chain, and it may not be a power of 2 in the first place.
 */
#define STRUCT_PAGE_MAX_SHIFT	6

/*
 * VMEMMAP_SIZE - allows the whole linear region to be covered by
 *                a struct page array
 */
#define VMEMMAP_SIZE (UL(1) << (VA_BITS - PAGE_SHIFT - 1 + STRUCT_PAGE_MAX_SHIFT))

/*
 * PAGE_OFFSET - the virtual address of the start of the kernel image (top
 *		 (VA_BITS - 1))
 * VA_BITS - the maximum number of bits for virtual addresses.
 * VA_START - the first kernel virtual address.
 * TASK_SIZE - the maximum size of a user space task.
 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area.
 */
#define VA_BITS			(CONFIG_ARM64_VA_BITS)
#define VA_START		(UL(0xffffffffffffffff) << VA_BITS)
#define PAGE_OFFSET		(UL(0xffffffffffffffff) << (VA_BITS - 1))
#define KIMAGE_VADDR		(MODULES_END)
#define MODULES_END		(MODULES_VADDR + MODULES_VSIZE)
#define MODULES_VADDR		(VA_START + KASAN_SHADOW_SIZE)
#define MODULES_VSIZE		(SZ_128M)
#define VMEMMAP_START		(PAGE_OFFSET - VMEMMAP_SIZE)
#define PCI_IO_END		(VMEMMAP_START - SZ_2M)
#define PCI_IO_START		(PCI_IO_END - PCI_IO_SIZE)
#define FIXADDR_TOP		(PCI_IO_START - SZ_2M)
#define TASK_SIZE_64		(UL(1) << VA_BITS)

#ifdef CONFIG_COMPAT
#define TASK_SIZE_32		UL(0x100000000)
#define TASK_SIZE		(test_thread_flag(TIF_32BIT) ? \
				TASK_SIZE_32 : TASK_SIZE_64)
#define TASK_SIZE_OF(tsk)	(test_tsk_thread_flag(tsk, TIF_32BIT) ? \
				TASK_SIZE_32 : TASK_SIZE_64)
#else
#define TASK_SIZE		TASK_SIZE_64
#endif /* CONFIG_COMPAT */

#define TASK_UNMAPPED_BASE	(PAGE_ALIGN(TASK_SIZE / 4))

#define KERNEL_START      _text
#define KERNEL_END        _end

/*
 * The size of the KASAN shadow region. This should be 1/8th of the
 * size of the entire kernel virtual address space.
 */
#ifdef CONFIG_KASAN
#define KASAN_SHADOW_SIZE	(UL(1) << (VA_BITS - 3))
#else
#define KASAN_SHADOW_SIZE	(0)
#endif

/*
 * Physical vs virtual RAM address space conversion.  These are
 * private definitions which should NOT be used outside memory.h
 * files.  Use virt_to_phys/phys_to_virt/__pa/__va instead.
 */
#define __virt_to_phys(x) ({						\
	phys_addr_t __x = (phys_addr_t)(x);				\
	__x & BIT(VA_BITS - 1) ? (__x & ~PAGE_OFFSET) + PHYS_OFFSET :	\
				 (__x - kimage_voffset); })

#define __phys_to_virt(x)	((unsigned long)((x) - PHYS_OFFSET) | PAGE_OFFSET)
#define __phys_to_kimg(x)	((unsigned long)((x) + kimage_voffset))

/*
 * Convert a page to/from a physical address
 */
#define page_to_phys(page)	(__pfn_to_phys(page_to_pfn(page)))
#define phys_to_page(phys)	(pfn_to_page(__phys_to_pfn(phys)))

/*
 * Memory types available.
 */
#define MT_DEVICE_nGnRnE	0
#define MT_DEVICE_nGnRE		1
#define MT_DEVICE_GRE		2
#define MT_NORMAL_NC		3
#define MT_NORMAL		4
#define MT_NORMAL_WT		5

/*
 * Memory types for Stage-2 translation
 */
#define MT_S2_NORMAL		0xf
#define MT_S2_DEVICE_nGnRE	0x1

#ifdef CONFIG_ARM64_4K_PAGES
#define IOREMAP_MAX_ORDER	(PUD_SHIFT)
#else
#define IOREMAP_MAX_ORDER	(PMD_SHIFT)
#endif

#ifdef CONFIG_BLK_DEV_INITRD
#define __early_init_dt_declare_initrd(__start, __end)			\
	do {								\
		initrd_start = (__start);				\
		initrd_end = (__end);					\
	} while (0)
#endif

#ifndef __ASSEMBLY__

#include <linux/bitops.h>
#include <linux/mmdebug.h>

extern s64			memstart_addr;
/* PHYS_OFFSET - the physical address of the start of memory. */
#define PHYS_OFFSET		({ VM_BUG_ON(memstart_addr & 1); memstart_addr; })

/* the virtual base of the kernel image (minus TEXT_OFFSET) */
extern u64			kimage_vaddr;

/* the offset between the kernel virtual and physical mappings */
extern u64			kimage_voffset;

/*
 * Allow all memory at the discovery stage. We will clip it later.
 */
#define MIN_MEMBLOCK_ADDR	0
#define MAX_MEMBLOCK_ADDR	U64_MAX

/*
 * PFNs are used to describe any physical page; this means
 * PFN 0 == physical address 0.
 *
 * This is the PFN of the first RAM page in the kernel
 * direct-mapped view.  We assume this is the first page
 * of RAM in the mem_map as well.
 */
#define PHYS_PFN_OFFSET	(PHYS_OFFSET >> PAGE_SHIFT)

/*
 * Note: Drivers should NOT use these.  They are the wrong
 * translation for translating DMA addresses.  Use the driver
 * DMA support - see dma-mapping.h.
 */
#define virt_to_phys virt_to_phys
static inline phys_addr_t virt_to_phys(const volatile void *x)
{
	return __virt_to_phys((unsigned long)(x));
}

#define phys_to_virt phys_to_virt
static inline void *phys_to_virt(phys_addr_t x)
{
	return (void *)(__phys_to_virt(x));
}

/*
 * Drivers should NOT use these either.
 */
#define __pa(x)			__virt_to_phys((unsigned long)(x))
#define __va(x)			((void *)__phys_to_virt((phys_addr_t)(x)))
#define pfn_to_kaddr(pfn)	__va((pfn) << PAGE_SHIFT)
#define virt_to_pfn(x)      __phys_to_pfn(__virt_to_phys(x))

/*
 *  virt_to_page(k)	convert a _valid_ virtual address to struct page *
 *  virt_addr_valid(k)	indicates whether a virtual address is valid
 */
#define ARCH_PFN_OFFSET		((unsigned long)PHYS_PFN_OFFSET)

#ifndef CONFIG_SPARSEMEM_VMEMMAP
#define virt_to_page(kaddr)	pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
#define virt_addr_valid(kaddr)	pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
#else
#define __virt_to_pgoff(kaddr)	(((u64)(kaddr) & ~PAGE_OFFSET) / PAGE_SIZE * sizeof(struct page))
#define __page_to_voff(kaddr)	(((u64)(page) & ~VMEMMAP_START) * PAGE_SIZE / sizeof(struct page))

#define page_to_virt(page)	((void *)((__page_to_voff(page)) | PAGE_OFFSET))
#define virt_to_page(vaddr)	((struct page *)((__virt_to_pgoff(vaddr)) | VMEMMAP_START))

#define virt_addr_valid(kaddr)	pfn_valid((((u64)(kaddr) & ~PAGE_OFFSET) \
					   + PHYS_OFFSET) >> PAGE_SHIFT)
#endif
#endif

#include <asm-generic/memory_model.h>

#endif
Commit	Line	Data
4f04d8f0 CM	1	/*
	2	* Based on arch/arm/include/asm/memory.h
	3	*
	4	* Copyright (C) 2000-2002 Russell King
	5	* Copyright (C) 2012 ARM Ltd.
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	18	*
	19	* Note: this file should not be included by non-asm/.h files
	20	*/
	21	#ifndef __ASM_MEMORY_H
	22	#define __ASM_MEMORY_H
	23
	24	#include <linux/compiler.h>
	25	#include <linux/const.h>
	26	#include <linux/types.h>
a7f8de16	27	#include <asm/bug.h>
4f04d8f0 CM	28	#include <asm/sizes.h>
	29
	30	/*
	31	* Allow for constants defined here to be used from assembly code
	32	* by prepending the UL suffix only with actual C code compilation.
	33	*/
	34	#define UL(x) _AC(x, UL)
	35
aa03c428 MR	36	/*
	37	* Size of the PCI I/O space. This must remain a power of two so that
	38	* IO_SPACE_LIMIT acts as a mask for the low bits of I/O addresses.
	39	*/
	40	#define PCI_IO_SIZE SZ_16M
	41
3e1907d5 AB	42	/*
	43	* Log2 of the upper bound of the size of a struct page. Used for sizing
	44	* the vmemmap region only, does not affect actual memory footprint.
	45	* We don't use sizeof(struct page) directly since taking its size here
	46	* requires its definition to be available at this point in the inclusion
	47	* chain, and it may not be a power of 2 in the first place.
	48	*/
	49	#define STRUCT_PAGE_MAX_SHIFT 6
	50
	51	/*
	52	* VMEMMAP_SIZE - allows the whole linear region to be covered by
	53	* a struct page array
	54	*/
	55	#define VMEMMAP_SIZE (UL(1) << (VA_BITS - PAGE_SHIFT - 1 + STRUCT_PAGE_MAX_SHIFT))
	56
4f04d8f0	57	/*
847264fb CM	58	* PAGE_OFFSET - the virtual address of the start of the kernel image (top
847264fb CM	59	* (VA_BITS - 1))
4f04d8f0	60	* VA_BITS - the maximum number of bits for virtual addresses.
127db024	61	* VA_START - the first kernel virtual address.
4f04d8f0 CM	62	* TASK_SIZE - the maximum size of a user space task.
4f04d8f0 CM	63	* TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area.
4f04d8f0	64	*/
e41ceed0	65	#define VA_BITS (CONFIG_ARM64_VA_BITS)
127db024	66	#define VA_START (UL(0xffffffffffffffff) << VA_BITS)
847264fb	67	#define PAGE_OFFSET (UL(0xffffffffffffffff) << (VA_BITS - 1))
f9040773 AB	68	#define KIMAGE_VADDR (MODULES_END)
	69	#define MODULES_END (MODULES_VADDR + MODULES_VSIZE)
	70	#define MODULES_VADDR (VA_START + KASAN_SHADOW_SIZE)
f80fb3a3	71	#define MODULES_VSIZE (SZ_128M)
3e1907d5 AB	72	#define VMEMMAP_START (PAGE_OFFSET - VMEMMAP_SIZE)
3e1907d5 AB	73	#define PCI_IO_END (VMEMMAP_START - SZ_2M)
aa03c428 MR	74	#define PCI_IO_START (PCI_IO_END - PCI_IO_SIZE)
aa03c428 MR	75	#define FIXADDR_TOP (PCI_IO_START - SZ_2M)
4f04d8f0 CM	76	#define TASK_SIZE_64 (UL(1) << VA_BITS)
	77
	78	#ifdef CONFIG_COMPAT
	79	#define TASK_SIZE_32 UL(0x100000000)
	80	#define TASK_SIZE (test_thread_flag(TIF_32BIT) ? \
	81	TASK_SIZE_32 : TASK_SIZE_64)
fa2ec3ea CC	82	#define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT) ? \
fa2ec3ea CC	83	TASK_SIZE_32 : TASK_SIZE_64)
4f04d8f0 CM	84	#else
	85	#define TASK_SIZE TASK_SIZE_64
	86	#endif /* CONFIG_COMPAT */
	87
	88	#define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 4))
	89
28c72583 JM	90	#define KERNEL_START _text
	91	#define KERNEL_END _end
	92
f9040773 AB	93	/*
	94	* The size of the KASAN shadow region. This should be 1/8th of the
	95	* size of the entire kernel virtual address space.
	96	*/
	97	#ifdef CONFIG_KASAN
	98	#define KASAN_SHADOW_SIZE (UL(1) << (VA_BITS - 3))
	99	#else
	100	#define KASAN_SHADOW_SIZE (0)
	101	#endif
	102
4f04d8f0 CM	103	/*
	104	* Physical vs virtual RAM address space conversion. These are
	105	* private definitions which should NOT be used outside memory.h
	106	* files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
	107	*/
ab893fb9 AB	108	#define __virt_to_phys(x) ({ \
ab893fb9 AB	109	phys_addr_t __x = (phys_addr_t)(x); \
8439e62a AB	110	__x & BIT(VA_BITS - 1) ? (__x & ~PAGE_OFFSET) + PHYS_OFFSET : \
8439e62a AB	111	(__x - kimage_voffset); })
ab893fb9	112
8439e62a	113	#define __phys_to_virt(x) ((unsigned long)((x) - PHYS_OFFSET) \| PAGE_OFFSET)
a7f8de16	114	#define __phys_to_kimg(x) ((unsigned long)((x) + kimage_voffset))
4f04d8f0	115
4f04d8f0 CM	116	/*
	117	* Convert a page to/from a physical address
	118	*/
	119	#define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page)))
	120	#define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys)))
	121
	122	/*
	123	* Memory types available.
	124	*/
	125	#define MT_DEVICE_nGnRnE 0
	126	#define MT_DEVICE_nGnRE 1
	127	#define MT_DEVICE_GRE 2
	128	#define MT_NORMAL_NC 3
	129	#define MT_NORMAL 4
8d446c86	130	#define MT_NORMAL_WT 5
4f04d8f0	131
36311607 MZ	132	/*
	133	* Memory types for Stage-2 translation
	134	*/
	135	#define MT_S2_NORMAL 0xf
	136	#define MT_S2_DEVICE_nGnRE 0x1
	137
324420bf AB	138	#ifdef CONFIG_ARM64_4K_PAGES
	139	#define IOREMAP_MAX_ORDER (PUD_SHIFT)
	140	#else
	141	#define IOREMAP_MAX_ORDER (PMD_SHIFT)
	142	#endif
	143
a89dea58 AB	144	#ifdef CONFIG_BLK_DEV_INITRD
	145	#define __early_init_dt_declare_initrd(__start, __end) \
	146	do { \
	147	initrd_start = (__start); \
	148	initrd_end = (__end); \
	149	} while (0)
	150	#endif
	151
4f04d8f0 CM	152	#ifndef __ASSEMBLY__
4f04d8f0 CM	153
8439e62a	154	#include <linux/bitops.h>
a92405f0 AB	155	#include <linux/mmdebug.h>
a92405f0 AB	156
020d044f	157	extern s64 memstart_addr;
4f04d8f0	158	/* PHYS_OFFSET - the physical address of the start of memory. */
a92405f0	159	#define PHYS_OFFSET ({ VM_BUG_ON(memstart_addr & 1); memstart_addr; })
a7f8de16	160
f80fb3a3 AB	161	/* the virtual base of the kernel image (minus TEXT_OFFSET) */
	162	extern u64 kimage_vaddr;
	163
a7f8de16 AB	164	/* the offset between the kernel virtual and physical mappings */
a7f8de16 AB	165	extern u64 kimage_voffset;
4f04d8f0	166
34ba2c42	167	/*
a7f8de16	168	* Allow all memory at the discovery stage. We will clip it later.
34ba2c42	169	*/
a7f8de16 AB	170	#define MIN_MEMBLOCK_ADDR 0
a7f8de16 AB	171	#define MAX_MEMBLOCK_ADDR U64_MAX
34ba2c42	172
4f04d8f0 CM	173	/*
	174	* PFNs are used to describe any physical page; this means
	175	* PFN 0 == physical address 0.
	176	*
	177	* This is the PFN of the first RAM page in the kernel
	178	* direct-mapped view. We assume this is the first page
	179	* of RAM in the mem_map as well.
	180	*/
	181	#define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
	182
	183	/*
	184	* Note: Drivers should NOT use these. They are the wrong
	185	* translation for translating DMA addresses. Use the driver
	186	* DMA support - see dma-mapping.h.
	187	*/
09a57239	188	#define virt_to_phys virt_to_phys
4f04d8f0 CM	189	static inline phys_addr_t virt_to_phys(const volatile void *x)
	190	{
	191	return __virt_to_phys((unsigned long)(x));
	192	}
	193
09a57239	194	#define phys_to_virt phys_to_virt
4f04d8f0 CM	195	static inline void *phys_to_virt(phys_addr_t x)
	196	{
	197	return (void *)(__phys_to_virt(x));
	198	}
	199
	200	/*
	201	* Drivers should NOT use these either.
	202	*/
	203	#define __pa(x) __virt_to_phys((unsigned long)(x))
	204	#define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x)))
	205	#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
1f53ba6e	206	#define virt_to_pfn(x) __phys_to_pfn(__virt_to_phys(x))
4f04d8f0 CM	207
	208	/*
	209	* virt_to_page(k) convert a _valid_ virtual address to struct page *
	210	* virt_addr_valid(k) indicates whether a virtual address is valid
	211	*/
5fd6690c	212	#define ARCH_PFN_OFFSET ((unsigned long)PHYS_PFN_OFFSET)
4f04d8f0	213
9f287591	214	#ifndef CONFIG_SPARSEMEM_VMEMMAP
4f04d8f0	215	#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
9f287591 AB	216	#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
	217	#else
	218	#define __virt_to_pgoff(kaddr) (((u64)(kaddr) & ~PAGE_OFFSET) / PAGE_SIZE * sizeof(struct page))
	219	#define __page_to_voff(kaddr) (((u64)(page) & ~VMEMMAP_START) * PAGE_SIZE / sizeof(struct page))
	220
	221	#define page_to_virt(page) ((void *)((__page_to_voff(page)) \| PAGE_OFFSET))
	222	#define virt_to_page(vaddr) ((struct page *)((__virt_to_pgoff(vaddr)) \| VMEMMAP_START))
4f04d8f0	223
9f287591 AB	224	#define virt_addr_valid(kaddr) pfn_valid((((u64)(kaddr) & ~PAGE_OFFSET) \
	225	+ PHYS_OFFSET) >> PAGE_SHIFT)
	226	#endif
4f04d8f0 CM	227	#endif
	228
	229	#include <asm-generic/memory_model.h>
	230
	231	#endif