1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _PARISC_PAGE_H
3#define _PARISC_PAGE_H
4
5#include <linux/const.h>
6
7#define PAGE_SHIFT	CONFIG_PAGE_SHIFT
8#define PAGE_SIZE	(_AC(1,UL) << PAGE_SHIFT)
9#define PAGE_MASK	(~(PAGE_SIZE-1))
10
11#define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
12
13#ifndef __ASSEMBLY__
14
15#include <asm/types.h>
16#include <asm/cache.h>
17
18#define clear_page(page)	clear_page_asm((void *)(page))
19#define copy_page(to, from)	copy_page_asm((void *)(to), (void *)(from))
20
21struct page;
22struct vm_area_struct;
23
24void clear_page_asm(void *page);
25void copy_page_asm(void *to, void *from);
26#define clear_user_page(vto, vaddr, page) clear_page_asm(vto)
27void copy_user_highpage(struct page *to, struct page *from, unsigned long vaddr,
28		struct vm_area_struct *vma);
29#define __HAVE_ARCH_COPY_USER_HIGHPAGE
30
31/*
32 * These are used to make use of C type-checking..
33 */
34#define STRICT_MM_TYPECHECKS
35#ifdef STRICT_MM_TYPECHECKS
36typedef struct { unsigned long pte; } pte_t; /* either 32 or 64bit */
37
38/* NOTE: even on 64 bits, these entries are __u32 because we allocate
39 * the pmd and pgd in ZONE_DMA (i.e. under 4GB) */
40typedef struct { __u32 pgd; } pgd_t;
41typedef struct { unsigned long pgprot; } pgprot_t;
42
43#if CONFIG_PGTABLE_LEVELS == 3
44typedef struct { __u32 pmd; } pmd_t;
45#define __pmd(x)	((pmd_t) { (x) } )
46/* pXd_val() do not work as lvalues, so make sure we don't use them as such. */
47#define pmd_val(x)	((x).pmd + 0)
48#endif
49
50#define pte_val(x)	((x).pte)
51#define pgd_val(x)	((x).pgd + 0)
52#define pgprot_val(x)	((x).pgprot)
53
54#define __pte(x)	((pte_t) { (x) } )
55#define __pgd(x)	((pgd_t) { (x) } )
56#define __pgprot(x)	((pgprot_t) { (x) } )
57
58#else
59/*
60 * .. while these make it easier on the compiler
61 */
62typedef unsigned long pte_t;
63
64#if CONFIG_PGTABLE_LEVELS == 3
65typedef         __u32 pmd_t;
66#define pmd_val(x)      (x)
67#define __pmd(x)	(x)
68#endif
69
70typedef         __u32 pgd_t;
71typedef unsigned long pgprot_t;
72
73#define pte_val(x)      (x)
74#define pgd_val(x)      (x)
75#define pgprot_val(x)   (x)
76
77#define __pte(x)        (x)
78#define __pgd(x)        (x)
79#define __pgprot(x)     (x)
80
81#endif /* STRICT_MM_TYPECHECKS */
82
83#define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
84#if CONFIG_PGTABLE_LEVELS == 3
85#define set_pud(pudptr, pudval) (*(pudptr) = (pudval))
86#endif
87
88typedef struct page *pgtable_t;
89
90typedef struct __physmem_range {
91	unsigned long start_pfn;
92	unsigned long pages;       /* PAGE_SIZE pages */
93} physmem_range_t;
94
95extern physmem_range_t pmem_ranges[];
96extern int npmem_ranges;
97
98#endif /* !__ASSEMBLY__ */
99
100/* WARNING: The definitions below must match exactly to sizeof(pte_t)
101 * etc
102 */
103#ifdef CONFIG_64BIT
104#define BITS_PER_PTE_ENTRY	3
105#define BITS_PER_PMD_ENTRY	2
106#define BITS_PER_PGD_ENTRY	2
107#else
108#define BITS_PER_PTE_ENTRY	2
109#define BITS_PER_PMD_ENTRY	2
110#define BITS_PER_PGD_ENTRY	2
111#endif
112#define PGD_ENTRY_SIZE	(1UL << BITS_PER_PGD_ENTRY)
113#define PMD_ENTRY_SIZE	(1UL << BITS_PER_PMD_ENTRY)
114#define PTE_ENTRY_SIZE	(1UL << BITS_PER_PTE_ENTRY)
115
116#define LINUX_GATEWAY_SPACE     0
117
118/* This governs the relationship between virtual and physical addresses.
119 * If you alter it, make sure to take care of our various fixed mapping
120 * segments in fixmap.h */
121#ifdef CONFIG_64BIT
122#define __PAGE_OFFSET_DEFAULT	(0x40000000)	/* 1GB */
123#else
124#define __PAGE_OFFSET_DEFAULT	(0x10000000)	/* 256MB */
125#endif
126
127#if defined(BOOTLOADER)
128#define __PAGE_OFFSET	(0)	/* bootloader uses physical addresses */
129#else
130#define __PAGE_OFFSET	__PAGE_OFFSET_DEFAULT
131#endif /* BOOTLOADER */
132
133#define PAGE_OFFSET		((unsigned long)__PAGE_OFFSET)
134
135/* The size of the gateway page (we leave lots of room for expansion) */
136#define GATEWAY_PAGE_SIZE	0x4000
137
138/* The start of the actual kernel binary---used in vmlinux.lds.S
139 * Leave some space after __PAGE_OFFSET for detecting kernel null
140 * ptr derefs */
141#define KERNEL_BINARY_TEXT_START	(__PAGE_OFFSET + 0x100000)
142
143/* These macros don't work for 64-bit C code -- don't allow in C at all */
144#ifdef __ASSEMBLY__
145#   define PA(x)	((x)-__PAGE_OFFSET)
146#   define VA(x)	((x)+__PAGE_OFFSET)
147#endif
148#define __pa(x)			((unsigned long)(x)-PAGE_OFFSET)
149#define __va(x)			((void *)((unsigned long)(x)+PAGE_OFFSET))
150
151#ifdef CONFIG_HUGETLB_PAGE
152#define HPAGE_SHIFT		PMD_SHIFT /* fixed for transparent huge pages */
153#define HPAGE_SIZE      	((1UL) << HPAGE_SHIFT)
154#define HPAGE_MASK		(~(HPAGE_SIZE - 1))
155#define HUGETLB_PAGE_ORDER	(HPAGE_SHIFT - PAGE_SHIFT)
156
157#if defined(CONFIG_64BIT) && defined(CONFIG_PARISC_PAGE_SIZE_4KB)
158# define REAL_HPAGE_SHIFT	20 /* 20 = 1MB */
159# define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_1M
160#elif !defined(CONFIG_64BIT) && defined(CONFIG_PARISC_PAGE_SIZE_4KB)
161# define REAL_HPAGE_SHIFT	22 /* 22 = 4MB */
162# define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_4M
163#else
164# define REAL_HPAGE_SHIFT	24 /* 24 = 16MB */
165# define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_16M
166#endif
167#endif /* CONFIG_HUGETLB_PAGE */
168
169#define virt_addr_valid(kaddr)	pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
170
171#define page_to_phys(page)	(page_to_pfn(page) << PAGE_SHIFT)
172#define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
173
174#include <asm-generic/memory_model.h>
175#include <asm-generic/getorder.h>
176#include <asm/pdc.h>
177
178#define PAGE0   ((struct zeropage *)absolute_pointer(__PAGE_OFFSET))
179
180/* DEFINITION OF THE ZERO-PAGE (PAG0) */
181/* based on work by Jason Eckhardt (jason@equator.com) */
182
183#endif /* _PARISC_PAGE_H */
184