[linux-2.6-block.git] / arch / sh / include / asm / page.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASM_SH_PAGE_H
#define __ASM_SH_PAGE_H

/*
 * Copyright (C) 1999  Niibe Yutaka
 */

#include <linux/const.h>

#include <vdso/page.h>

#define PTE_MASK	PAGE_MASK

#if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
#define HPAGE_SHIFT	16
#elif defined(CONFIG_HUGETLB_PAGE_SIZE_256K)
#define HPAGE_SHIFT	18
#elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
#define HPAGE_SHIFT	20
#elif defined(CONFIG_HUGETLB_PAGE_SIZE_4MB)
#define HPAGE_SHIFT	22
#elif defined(CONFIG_HUGETLB_PAGE_SIZE_64MB)
#define HPAGE_SHIFT	26
#endif

#ifdef CONFIG_HUGETLB_PAGE
#define HPAGE_SIZE		(1UL << HPAGE_SHIFT)
#define HPAGE_MASK		(~(HPAGE_SIZE-1))
#define HUGETLB_PAGE_ORDER	(HPAGE_SHIFT-PAGE_SHIFT)
#endif

#ifndef __ASSEMBLER__
#include <asm/uncached.h>

extern unsigned long shm_align_mask;
extern unsigned long max_low_pfn, min_low_pfn;
extern unsigned long memory_start, memory_end, memory_limit;

static inline unsigned long
pages_do_alias(unsigned long addr1, unsigned long addr2)
{
	return (addr1 ^ addr2) & shm_align_mask;
}

#define clear_page(page)	memset((void *)(page), 0, PAGE_SIZE)
extern void copy_page(void *to, void *from);
#define copy_user_page(to, from, vaddr, pg)  __copy_user(to, from, PAGE_SIZE)

struct page;
struct vm_area_struct;

extern void copy_user_highpage(struct page *to, struct page *from,
			       unsigned long vaddr, struct vm_area_struct *vma);
#define __HAVE_ARCH_COPY_USER_HIGHPAGE
extern void clear_user_highpage(struct page *page, unsigned long vaddr);
#define clear_user_highpage	clear_user_highpage

/*
 * These are used to make use of C type-checking..
 */
#ifdef CONFIG_X2TLB
typedef struct { unsigned long pte_low, pte_high; } pte_t;
typedef struct { unsigned long long pgprot; } pgprot_t;
typedef struct { unsigned long long pgd; } pgd_t;
#define pte_val(x) \
	((x).pte_low | ((unsigned long long)(x).pte_high << 32))
#define __pte(x) \
	({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
#else
typedef struct { unsigned long pte_low; } pte_t;
typedef struct { unsigned long pgprot; } pgprot_t;
typedef struct { unsigned long pgd; } pgd_t;
#define pte_val(x)	((x).pte_low)
#define __pte(x)	((pte_t) { (x) } )
#endif

#define pgd_val(x)	((x).pgd)
#define pgprot_val(x)	((x).pgprot)

#define __pgd(x) ((pgd_t) { (x) } )
#define __pgprot(x)	((pgprot_t) { (x) } )

typedef struct page *pgtable_t;

#define pte_pgprot(x) __pgprot(pte_val(x) & PTE_FLAGS_MASK)

#endif /* !__ASSEMBLER__ */

/*
 * __MEMORY_START and SIZE are the physical addresses and size of RAM.
 */
#define __MEMORY_START		CONFIG_MEMORY_START
#define __MEMORY_SIZE		CONFIG_MEMORY_SIZE

/*
 * PHYSICAL_OFFSET is the offset in physical memory where the base
 * of the kernel is loaded.
 */
#ifdef CONFIG_PHYSICAL_START
#define PHYSICAL_OFFSET (CONFIG_PHYSICAL_START - __MEMORY_START)
#else
#define PHYSICAL_OFFSET 0
#endif

/*
 * PAGE_OFFSET is the virtual address of the start of kernel address
 * space.
 */
#define PAGE_OFFSET		CONFIG_PAGE_OFFSET

/*
 * Virtual to physical RAM address translation.
 *
 * In 29 bit mode, the physical offset of RAM from address 0 is visible in
 * the kernel virtual address space, and thus we don't have to take
 * this into account when translating. However in 32 bit mode this offset
 * is not visible (it is part of the PMB mapping) and so needs to be
 * added or subtracted as required.
 */
#ifdef CONFIG_PMB
#define ___pa(x)	((x)-PAGE_OFFSET+__MEMORY_START)
#define ___va(x)	((x)+PAGE_OFFSET-__MEMORY_START)
#else
#define ___pa(x)	((x)-PAGE_OFFSET)
#define ___va(x)	((x)+PAGE_OFFSET)
#endif

#ifndef __ASSEMBLER__
#define __pa(x)		___pa((unsigned long)x)
#define __va(x)		(void *)___va((unsigned long)x)
#endif /* !__ASSEMBLER__ */

#ifdef CONFIG_UNCACHED_MAPPING
#if defined(CONFIG_29BIT)
#define UNCAC_ADDR(addr)	P2SEGADDR(addr)
#define CAC_ADDR(addr)		P1SEGADDR(addr)
#else
#define UNCAC_ADDR(addr)	((addr) - PAGE_OFFSET + uncached_start)
#define CAC_ADDR(addr)		((addr) - uncached_start + PAGE_OFFSET)
#endif
#else
#define UNCAC_ADDR(addr)	((addr))
#define CAC_ADDR(addr)		((addr))
#endif

#define pfn_to_kaddr(pfn)	__va((pfn) << PAGE_SHIFT)

/*
 * PFN = physical frame number (ie PFN 0 == physical address 0)
 * PFN_START is the PFN of the first page of RAM. By defining this we
 * don't have struct page entries for the portion of address space
 * between physical address 0 and the start of RAM.
 */
#define PFN_START		(__MEMORY_START >> PAGE_SHIFT)
#define ARCH_PFN_OFFSET		(PFN_START)
#define virt_to_page(kaddr)	pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
#define virt_addr_valid(kaddr)	pfn_valid(__pa(kaddr) >> PAGE_SHIFT)

#include <asm-generic/memory_model.h>
#include <asm-generic/getorder.h>

#endif /* __ASM_SH_PAGE_H */
Commit	Line	Data
	1	/* SPDX-License-Identifier: GPL-2.0 */
	2	#ifndef __ASM_SH_PAGE_H
	3	#define __ASM_SH_PAGE_H
	4
	5	/*
	6	* Copyright (C) 1999 Niibe Yutaka
	7	*/
	8
	9	#include <linux/const.h>
	10
	11	#include <vdso/page.h>
	12
	13	#define PTE_MASK PAGE_MASK
	14
	15	#if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
	16	#define HPAGE_SHIFT 16
	17	#elif defined(CONFIG_HUGETLB_PAGE_SIZE_256K)
	18	#define HPAGE_SHIFT 18
	19	#elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
	20	#define HPAGE_SHIFT 20
	21	#elif defined(CONFIG_HUGETLB_PAGE_SIZE_4MB)
	22	#define HPAGE_SHIFT 22
	23	#elif defined(CONFIG_HUGETLB_PAGE_SIZE_64MB)
	24	#define HPAGE_SHIFT 26
	25	#endif
	26
	27	#ifdef CONFIG_HUGETLB_PAGE
	28	#define HPAGE_SIZE (1UL << HPAGE_SHIFT)
	29	#define HPAGE_MASK (~(HPAGE_SIZE-1))
	30	#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT-PAGE_SHIFT)
	31	#endif
	32
	33	#ifndef __ASSEMBLER__
	34	#include <asm/uncached.h>
	35
	36	extern unsigned long shm_align_mask;
	37	extern unsigned long max_low_pfn, min_low_pfn;
	38	extern unsigned long memory_start, memory_end, memory_limit;
	39
	40	static inline unsigned long
	41	pages_do_alias(unsigned long addr1, unsigned long addr2)
	42	{
	43	return (addr1 ^ addr2) & shm_align_mask;
	44	}
	45
	46	#define clear_page(page) memset((void *)(page), 0, PAGE_SIZE)
	47	extern void copy_page(void to, void from);
	48	#define copy_user_page(to, from, vaddr, pg) __copy_user(to, from, PAGE_SIZE)
	49
	50	struct page;
	51	struct vm_area_struct;
	52
	53	extern void copy_user_highpage(struct page to, struct page from,
	54	unsigned long vaddr, struct vm_area_struct *vma);
	55	#define __HAVE_ARCH_COPY_USER_HIGHPAGE
	56	extern void clear_user_highpage(struct page *page, unsigned long vaddr);
	57	#define clear_user_highpage clear_user_highpage
	58
	59	/*
	60	* These are used to make use of C type-checking..
	61	*/
	62	#ifdef CONFIG_X2TLB
	63	typedef struct { unsigned long pte_low, pte_high; } pte_t;
	64	typedef struct { unsigned long long pgprot; } pgprot_t;
	65	typedef struct { unsigned long long pgd; } pgd_t;
	66	#define pte_val(x) \
	67	((x).pte_low \| ((unsigned long long)(x).pte_high << 32))
	68	#define __pte(x) \
	69	({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
	70	#else
	71	typedef struct { unsigned long pte_low; } pte_t;
	72	typedef struct { unsigned long pgprot; } pgprot_t;
	73	typedef struct { unsigned long pgd; } pgd_t;
	74	#define pte_val(x) ((x).pte_low)
	75	#define __pte(x) ((pte_t) { (x) } )
	76	#endif
	77
	78	#define pgd_val(x) ((x).pgd)
	79	#define pgprot_val(x) ((x).pgprot)
	80
	81	#define __pgd(x) ((pgd_t) { (x) } )
	82	#define __pgprot(x) ((pgprot_t) { (x) } )
	83
	84	typedef struct page *pgtable_t;
	85
	86	#define pte_pgprot(x) __pgprot(pte_val(x) & PTE_FLAGS_MASK)
	87
	88	#endif /* !__ASSEMBLER__ */
	89
	90	/*
	91	* __MEMORY_START and SIZE are the physical addresses and size of RAM.
	92	*/
	93	#define __MEMORY_START CONFIG_MEMORY_START
	94	#define __MEMORY_SIZE CONFIG_MEMORY_SIZE
	95
	96	/*
	97	* PHYSICAL_OFFSET is the offset in physical memory where the base
	98	* of the kernel is loaded.
	99	*/
	100	#ifdef CONFIG_PHYSICAL_START
	101	#define PHYSICAL_OFFSET (CONFIG_PHYSICAL_START - __MEMORY_START)
	102	#else
	103	#define PHYSICAL_OFFSET 0
	104	#endif
	105
	106	/*
	107	* PAGE_OFFSET is the virtual address of the start of kernel address
	108	* space.
	109	*/
	110	#define PAGE_OFFSET CONFIG_PAGE_OFFSET
	111
	112	/*
	113	* Virtual to physical RAM address translation.
	114	*
	115	* In 29 bit mode, the physical offset of RAM from address 0 is visible in
	116	* the kernel virtual address space, and thus we don't have to take
	117	* this into account when translating. However in 32 bit mode this offset
	118	* is not visible (it is part of the PMB mapping) and so needs to be
	119	* added or subtracted as required.
	120	*/
	121	#ifdef CONFIG_PMB
	122	#define ___pa(x) ((x)-PAGE_OFFSET+__MEMORY_START)
	123	#define ___va(x) ((x)+PAGE_OFFSET-__MEMORY_START)
	124	#else
	125	#define ___pa(x) ((x)-PAGE_OFFSET)
	126	#define ___va(x) ((x)+PAGE_OFFSET)
	127	#endif
	128
	129	#ifndef __ASSEMBLER__
	130	#define __pa(x) ___pa((unsigned long)x)
	131	#define __va(x) (void *)___va((unsigned long)x)
	132	#endif /* !__ASSEMBLER__ */
	133
	134	#ifdef CONFIG_UNCACHED_MAPPING
	135	#if defined(CONFIG_29BIT)
	136	#define UNCAC_ADDR(addr) P2SEGADDR(addr)
	137	#define CAC_ADDR(addr) P1SEGADDR(addr)
	138	#else
	139	#define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + uncached_start)
	140	#define CAC_ADDR(addr) ((addr) - uncached_start + PAGE_OFFSET)
	141	#endif
	142	#else
	143	#define UNCAC_ADDR(addr) ((addr))
	144	#define CAC_ADDR(addr) ((addr))
	145	#endif
	146
	147	#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
	148
	149	/*
	150	* PFN = physical frame number (ie PFN 0 == physical address 0)
	151	* PFN_START is the PFN of the first page of RAM. By defining this we
	152	* don't have struct page entries for the portion of address space
	153	* between physical address 0 and the start of RAM.
	154	*/
	155	#define PFN_START (__MEMORY_START >> PAGE_SHIFT)
	156	#define ARCH_PFN_OFFSET (PFN_START)
	157	#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
	158	#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
	159
	160	#include <asm-generic/memory_model.h>
	161	#include <asm-generic/getorder.h>
	162
	163	#endif /* __ASM_SH_PAGE_H */