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 pgd; } pgd_t;
46typedef struct { unsigned long pgprot; } pgprot_t;
47
48#if CONFIG_PGTABLE_LEVELS == 3
49typedef struct { __u32 pmd; } pmd_t;
50#define __pmd(x)	((pmd_t) { (x) } )
51/* pXd_val() do not work as lvalues, so make sure we don't use them as such. */
52#define pmd_val(x)	((x).pmd + 0)
53#endif
54
55#define pte_val(x)	((x).pte)
56#define pgd_val(x)	((x).pgd + 0)
57#define pgprot_val(x)	((x).pgprot)
58
59#define __pte(x)	((pte_t) { (x) } )
60#define __pgd(x)	((pgd_t) { (x) } )
61#define __pgprot(x)	((pgprot_t) { (x) } )
62
63#else
64/*
65 * .. while these make it easier on the compiler
66 */
67typedef unsigned long pte_t;
68
69#if CONFIG_PGTABLE_LEVELS == 3
70typedef         __u32 pmd_t;
71#define pmd_val(x)      (x)
72#define __pmd(x)	(x)
73#endif
74
75typedef         __u32 pgd_t;
76typedef unsigned long pgprot_t;
77
78#define pte_val(x)      (x)
79#define pgd_val(x)      (x)
80#define pgprot_val(x)   (x)
81
82#define __pte(x)        (x)
83#define __pgd(x)        (x)
84#define __pgprot(x)     (x)
85
86#endif /* STRICT_MM_TYPECHECKS */
87
88#define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
89#if CONFIG_PGTABLE_LEVELS == 3
90#define set_pud(pudptr, pudval) (*(pudptr) = (pudval))
91#endif
92
93typedef struct page *pgtable_t;
94
95typedef struct __physmem_range {
96	unsigned long start_pfn;
97	unsigned long pages;       /* PAGE_SIZE pages */
98} physmem_range_t;
99
100extern physmem_range_t pmem_ranges[];
101extern int npmem_ranges;
102
103#endif /* !__ASSEMBLY__ */
104
105/* WARNING: The definitions below must match exactly to sizeof(pte_t)
106 * etc
107 */
108#ifdef CONFIG_64BIT
109#define BITS_PER_PTE_ENTRY	3
110#define BITS_PER_PMD_ENTRY	2
111#define BITS_PER_PGD_ENTRY	2
112#else
113#define BITS_PER_PTE_ENTRY	2
114#define BITS_PER_PMD_ENTRY	2
115#define BITS_PER_PGD_ENTRY	2
116#endif
117#define PGD_ENTRY_SIZE	(1UL << BITS_PER_PGD_ENTRY)
118#define PMD_ENTRY_SIZE	(1UL << BITS_PER_PMD_ENTRY)
119#define PTE_ENTRY_SIZE	(1UL << BITS_PER_PTE_ENTRY)
120
121#define LINUX_GATEWAY_SPACE     0
122
123/* This governs the relationship between virtual and physical addresses.
124 * If you alter it, make sure to take care of our various fixed mapping
125 * segments in fixmap.h */
126#ifdef CONFIG_64BIT
127#define __PAGE_OFFSET_DEFAULT	(0x40000000)	/* 1GB */
128#else
129#define __PAGE_OFFSET_DEFAULT	(0x10000000)	/* 256MB */
130#endif
131
132#if defined(BOOTLOADER)
133#define __PAGE_OFFSET	(0)	/* bootloader uses physical addresses */
134#else
135#define __PAGE_OFFSET	__PAGE_OFFSET_DEFAULT
136#endif /* BOOTLOADER */
137
138#define PAGE_OFFSET		((unsigned long)__PAGE_OFFSET)
139
140/* The size of the gateway page (we leave lots of room for expansion) */
141#define GATEWAY_PAGE_SIZE	0x4000
142
143/* The start of the actual kernel binary---used in vmlinux.lds.S
144 * Leave some space after __PAGE_OFFSET for detecting kernel null
145 * ptr derefs */
146#define KERNEL_BINARY_TEXT_START	(__PAGE_OFFSET + 0x100000)
147
148/* These macros don't work for 64-bit C code -- don't allow in C at all */
149#ifdef __ASSEMBLY__
150#   define PA(x)	((x)-__PAGE_OFFSET)
151#   define VA(x)	((x)+__PAGE_OFFSET)
152#endif
153#define __pa(x)			((unsigned long)(x)-PAGE_OFFSET)
154#define __va(x)			((void *)((unsigned long)(x)+PAGE_OFFSET))
155
156#ifndef CONFIG_SPARSEMEM
157#define pfn_valid(pfn)		((pfn) < max_mapnr)
158#endif
159
160#ifdef CONFIG_HUGETLB_PAGE
161#define HPAGE_SHIFT		PMD_SHIFT /* fixed for transparent huge pages */
162#define HPAGE_SIZE      	((1UL) << HPAGE_SHIFT)
163#define HPAGE_MASK		(~(HPAGE_SIZE - 1))
164#define HUGETLB_PAGE_ORDER	(HPAGE_SHIFT - PAGE_SHIFT)
165
166#if defined(CONFIG_64BIT) && defined(CONFIG_PARISC_PAGE_SIZE_4KB)
167# define REAL_HPAGE_SHIFT	20 /* 20 = 1MB */
168# define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_1M
169#elif !defined(CONFIG_64BIT) && defined(CONFIG_PARISC_PAGE_SIZE_4KB)
170# define REAL_HPAGE_SHIFT	22 /* 22 = 4MB */
171# define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_4M
172#else
173# define REAL_HPAGE_SHIFT	24 /* 24 = 16MB */
174# define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_16M
175#endif
176#endif /* CONFIG_HUGETLB_PAGE */
177
178#define virt_addr_valid(kaddr)	pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
179
180#define page_to_phys(page)	(page_to_pfn(page) << PAGE_SHIFT)
181#define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
182
183#include <asm-generic/memory_model.h>
184#include <asm-generic/getorder.h>
185#include <asm/pdc.h>
186
187#define PAGE0   ((struct zeropage *)absolute_pointer(__PAGE_OFFSET))
188
189/* DEFINITION OF THE ZERO-PAGE (PAG0) */
190/* based on work by Jason Eckhardt (jason@equator.com) */
191
192#endif /* _PARISC_PAGE_H */
193