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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#if defined(CONFIG_PARISC_PAGE_SIZE_4KB)
8# define PAGE_SHIFT 12
9#elif defined(CONFIG_PARISC_PAGE_SIZE_16KB)
10# define PAGE_SHIFT 14
11#elif defined(CONFIG_PARISC_PAGE_SIZE_64KB)
12# define PAGE_SHIFT 16
13#else
14# error "unknown default kernel page size"
15#endif
16#define PAGE_SIZE (_AC(1,UL) << PAGE_SHIFT)
17#define PAGE_MASK (~(PAGE_SIZE-1))
18
19
20#ifndef __ASSEMBLY__
21
22#include <asm/types.h>
23#include <asm/cache.h>
24
25#define clear_page(page) clear_page_asm((void *)(page))
26#define copy_page(to, from) copy_page_asm((void *)(to), (void *)(from))
27
28struct page;
29
30void clear_page_asm(void *page);
31void copy_page_asm(void *to, void *from);
32#define clear_user_page(vto, vaddr, page) clear_page_asm(vto)
33void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
34 struct page *pg);
35
36/*
37 * These are used to make use of C type-checking..
38 */
39#define STRICT_MM_TYPECHECKS
40#ifdef STRICT_MM_TYPECHECKS
41typedef struct { unsigned long pte; } pte_t; /* either 32 or 64bit */
42
43/* NOTE: even on 64 bits, these entries are __u32 because we allocate
44 * the pmd and pgd in ZONE_DMA (i.e. under 4GB) */
45typedef struct { __u32 pmd; } pmd_t;
46typedef struct { __u32 pgd; } pgd_t;
47typedef struct { unsigned long pgprot; } pgprot_t;
48
49#define pte_val(x) ((x).pte)
50/* These do not work lvalues, so make sure we don't use them as such. */
51#define pmd_val(x) ((x).pmd + 0)
52#define pgd_val(x) ((x).pgd + 0)
53#define pgprot_val(x) ((x).pgprot)
54
55#define __pte(x) ((pte_t) { (x) } )
56#define __pmd(x) ((pmd_t) { (x) } )
57#define __pgd(x) ((pgd_t) { (x) } )
58#define __pgprot(x) ((pgprot_t) { (x) } )
59
60#define __pmd_val_set(x,n) (x).pmd = (n)
61#define __pgd_val_set(x,n) (x).pgd = (n)
62
63#else
64/*
65 * .. while these make it easier on the compiler
66 */
67typedef unsigned long pte_t;
68typedef __u32 pmd_t;
69typedef __u32 pgd_t;
70typedef unsigned long pgprot_t;
71
72#define pte_val(x) (x)
73#define pmd_val(x) (x)
74#define pgd_val(x) (x)
75#define pgprot_val(x) (x)
76
77#define __pte(x) (x)
78#define __pmd(x) (x)
79#define __pgd(x) (x)
80#define __pgprot(x) (x)
81
82#define __pmd_val_set(x,n) (x) = (n)
83#define __pgd_val_set(x,n) (x) = (n)
84
85#endif /* STRICT_MM_TYPECHECKS */
86
87typedef struct page *pgtable_t;
88
89typedef struct __physmem_range {
90 unsigned long start_pfn;
91 unsigned long pages; /* PAGE_SIZE pages */
92} physmem_range_t;
93
94extern physmem_range_t pmem_ranges[];
95extern int npmem_ranges;
96
97#endif /* !__ASSEMBLY__ */
98
99/* WARNING: The definitions below must match exactly to sizeof(pte_t)
100 * etc
101 */
102#ifdef CONFIG_64BIT
103#define BITS_PER_PTE_ENTRY 3
104#define BITS_PER_PMD_ENTRY 2
105#define BITS_PER_PGD_ENTRY 2
106#else
107#define BITS_PER_PTE_ENTRY 2
108#define BITS_PER_PMD_ENTRY 2
109#define BITS_PER_PGD_ENTRY BITS_PER_PMD_ENTRY
110#endif
111#define PGD_ENTRY_SIZE (1UL << BITS_PER_PGD_ENTRY)
112#define PMD_ENTRY_SIZE (1UL << BITS_PER_PMD_ENTRY)
113#define PTE_ENTRY_SIZE (1UL << BITS_PER_PTE_ENTRY)
114
115#define LINUX_GATEWAY_SPACE 0
116
117/* This governs the relationship between virtual and physical addresses.
118 * If you alter it, make sure to take care of our various fixed mapping
119 * segments in fixmap.h */
120#ifdef CONFIG_64BIT
121#define __PAGE_OFFSET_DEFAULT (0x40000000) /* 1GB */
122#else
123#define __PAGE_OFFSET_DEFAULT (0x10000000) /* 256MB */
124#endif
125
126#if defined(BOOTLOADER)
127#define __PAGE_OFFSET (0) /* bootloader uses physical addresses */
128#else
129#define __PAGE_OFFSET __PAGE_OFFSET_DEFAULT
130#endif /* BOOTLOADER */
131
132#define PAGE_OFFSET ((unsigned long)__PAGE_OFFSET)
133
134/* The size of the gateway page (we leave lots of room for expansion) */
135#define GATEWAY_PAGE_SIZE 0x4000
136
137/* The start of the actual kernel binary---used in vmlinux.lds.S
138 * Leave some space after __PAGE_OFFSET for detecting kernel null
139 * ptr derefs */
140#define KERNEL_BINARY_TEXT_START (__PAGE_OFFSET + 0x100000)
141
142/* These macros don't work for 64-bit C code -- don't allow in C at all */
143#ifdef __ASSEMBLY__
144# define PA(x) ((x)-__PAGE_OFFSET)
145# define VA(x) ((x)+__PAGE_OFFSET)
146#endif
147#define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
148#define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
149
150#ifndef CONFIG_DISCONTIGMEM
151#define pfn_valid(pfn) ((pfn) < max_mapnr)
152#endif /* CONFIG_DISCONTIGMEM */
153
154#ifdef CONFIG_HUGETLB_PAGE
155#define HPAGE_SHIFT PMD_SHIFT /* fixed for transparent huge pages */
156#define HPAGE_SIZE ((1UL) << HPAGE_SHIFT)
157#define HPAGE_MASK (~(HPAGE_SIZE - 1))
158#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
159
160#if defined(CONFIG_64BIT) && defined(CONFIG_PARISC_PAGE_SIZE_4KB)
161# define REAL_HPAGE_SHIFT 20 /* 20 = 1MB */
162# define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_1M
163#elif !defined(CONFIG_64BIT) && defined(CONFIG_PARISC_PAGE_SIZE_4KB)
164# define REAL_HPAGE_SHIFT 22 /* 22 = 4MB */
165# define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_4M
166#else
167# define REAL_HPAGE_SHIFT 24 /* 24 = 16MB */
168# define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_16M
169#endif
170#endif /* CONFIG_HUGETLB_PAGE */
171
172#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
173
174#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
175#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
176
177#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
178 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
179
180#include <asm-generic/memory_model.h>
181#include <asm-generic/getorder.h>
182#include <asm/pdc.h>
183
184#define PAGE0 ((struct zeropage *)__PAGE_OFFSET)
185
186/* DEFINITION OF THE ZERO-PAGE (PAG0) */
187/* based on work by Jason Eckhardt (jason@equator.com) */
188
189#endif /* _PARISC_PAGE_H */