1/* SPDX-License-Identifier: GPL-2.0-only */
  2/*
  3 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
  4 */
  5#ifndef __ASM_ARC_PAGE_H
  6#define __ASM_ARC_PAGE_H
  7
  8#include <uapi/asm/page.h>
  9
 10#ifdef CONFIG_ARC_HAS_PAE40
 11
 12#define MAX_POSSIBLE_PHYSMEM_BITS	40
 13#define PAGE_MASK_PHYS			(0xff00000000ull | PAGE_MASK)
 14
 15#else /* CONFIG_ARC_HAS_PAE40 */
 16
 17#define MAX_POSSIBLE_PHYSMEM_BITS	32
 18#define PAGE_MASK_PHYS			PAGE_MASK
 19
 20#endif /* CONFIG_ARC_HAS_PAE40 */
 21
 22#ifndef __ASSEMBLY__
 23
 24#define clear_page(paddr)		memset((paddr), 0, PAGE_SIZE)
 25#define copy_user_page(to, from, vaddr, pg)	copy_page(to, from)
 26#define copy_page(to, from)		memcpy((to), (from), PAGE_SIZE)
 27
 28struct vm_area_struct;
 29struct page;
 30
 31#define __HAVE_ARCH_COPY_USER_HIGHPAGE
 32
 33void copy_user_highpage(struct page *to, struct page *from,
 34			unsigned long u_vaddr, struct vm_area_struct *vma);
 35void clear_user_page(void *to, unsigned long u_vaddr, struct page *page);
 36
 37typedef struct {
 38	unsigned long pgd;
 39} pgd_t;
 40
 41#define pgd_val(x)	((x).pgd)
 42#define __pgd(x)	((pgd_t) { (x) })
 43
 44#if CONFIG_PGTABLE_LEVELS > 3
 45
 46typedef struct {
 47	unsigned long pud;
 48} pud_t;
 49
 50#define pud_val(x)      	((x).pud)
 51#define __pud(x)        	((pud_t) { (x) })
 52
 53#endif
 54
 55#if CONFIG_PGTABLE_LEVELS > 2
 56
 57typedef struct {
 58	unsigned long pmd;
 59} pmd_t;
 60
 61#define pmd_val(x)	((x).pmd)
 62#define __pmd(x)	((pmd_t) { (x) })
 63
 64#endif
 65
 66typedef struct {
 67#ifdef CONFIG_ARC_HAS_PAE40
 68	unsigned long long pte;
 69#else
 70	unsigned long pte;
 71#endif
 72} pte_t;
 73
 74#define pte_val(x)	((x).pte)
 75#define __pte(x)	((pte_t) { (x) })
 76
 77typedef struct {
 78	unsigned long pgprot;
 79} pgprot_t;
 80
 81#define pgprot_val(x)	((x).pgprot)
 82#define __pgprot(x)	((pgprot_t) { (x) })
 83#define pte_pgprot(x)	__pgprot(pte_val(x))
 84
 85typedef struct page *pgtable_t;
 86
 87/*
 88 * When HIGHMEM is enabled we have holes in the memory map so we need
 89 * pfn_valid() that takes into account the actual extents of the physical
 90 * memory
 91 */
 92#ifdef CONFIG_HIGHMEM
 93
 94extern unsigned long arch_pfn_offset;
 95#define ARCH_PFN_OFFSET		arch_pfn_offset
 96
 97extern int pfn_valid(unsigned long pfn);
 98#define pfn_valid		pfn_valid
 99
100#else /* CONFIG_HIGHMEM */
101
102#define ARCH_PFN_OFFSET		virt_to_pfn((void *)CONFIG_LINUX_RAM_BASE)
103
104#endif /* CONFIG_HIGHMEM */
105
106/*
107 * __pa, __va, virt_to_page (ALERT: deprecated, don't use them)
108 *
109 * These macros have historically been misnamed
110 * virt here means link-address/program-address as embedded in object code.
111 * And for ARC, link-addr = physical address
112 */
113#define __pa(vaddr)  		((unsigned long)(vaddr))
114#define __va(paddr)  		((void *)((unsigned long)(paddr)))
115
116/*
117 * Use virt_to_pfn with caution:
118 * If used in pte or paddr related macros, it could cause truncation
119 * in PAE40 builds
120 * As a rule of thumb, only use it in helpers starting with virt_
121 * You have been warned !
122 */
123static inline unsigned long virt_to_pfn(const void *kaddr)
124{
125	return __pa(kaddr) >> PAGE_SHIFT;
126}
127
128#define virt_to_page(kaddr)	pfn_to_page(virt_to_pfn(kaddr))
129#define virt_addr_valid(kaddr)  pfn_valid(virt_to_pfn(kaddr))
130
131/* Default Permissions for stack/heaps pages (Non Executable) */
132#define VM_DATA_DEFAULT_FLAGS	VM_DATA_FLAGS_NON_EXEC
133
134#define WANT_PAGE_VIRTUAL   1
135
136#include <asm-generic/memory_model.h>   /* page_to_pfn, pfn_to_page */
137#include <asm-generic/getorder.h>
138
139#endif /* !__ASSEMBLY__ */
140
141#endif