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
12#ifndef __ASSEMBLY__
13
14#include <asm/types.h>
15#include <asm/cache.h>
16
17#define clear_page(page)	clear_page_asm((void *)(page))
18#define copy_page(to, from)	copy_page_asm((void *)(to), (void *)(from))
19
20struct page;
21struct vm_area_struct;
22
23void clear_page_asm(void *page);
24void copy_page_asm(void *to, void *from);
25#define clear_user_page(vto, vaddr, page) clear_page_asm(vto)
26void copy_user_highpage(struct page *to, struct page *from, unsigned long vaddr,
27		struct vm_area_struct *vma);
28#define __HAVE_ARCH_COPY_USER_HIGHPAGE
29
30/*
31 * These are used to make use of C type-checking..
32 */
33#define STRICT_MM_TYPECHECKS
34#ifdef STRICT_MM_TYPECHECKS
35typedef struct { unsigned long pte; } pte_t; /* either 32 or 64bit */
36
37/* NOTE: even on 64 bits, these entries are __u32 because we allocate
38 * the pmd and pgd in ZONE_DMA (i.e. under 4GB) */
39typedef struct { __u32 pgd; } pgd_t;
40typedef struct { unsigned long pgprot; } pgprot_t;
41
42#if CONFIG_PGTABLE_LEVELS == 3
43typedef struct { __u32 pmd; } pmd_t;
44#define __pmd(x)	((pmd_t) { (x) } )
45/* pXd_val() do not work as lvalues, so make sure we don't use them as such. */
46#define pmd_val(x)	((x).pmd + 0)
47#endif
48
49#define pte_val(x)	((x).pte)
50#define pgd_val(x)	((x).pgd + 0)
51#define pgprot_val(x)	((x).pgprot)
52
53#define __pte(x)	((pte_t) { (x) } )
54#define __pgd(x)	((pgd_t) { (x) } )
55#define __pgprot(x)	((pgprot_t) { (x) } )
56
57#else
58/*
59 * .. while these make it easier on the compiler
60 */
61typedef unsigned long pte_t;
62
63#if CONFIG_PGTABLE_LEVELS == 3
64typedef         __u32 pmd_t;
65#define pmd_val(x)      (x)
66#define __pmd(x)	(x)
67#endif
68
69typedef         __u32 pgd_t;
70typedef unsigned long pgprot_t;
71
72#define pte_val(x)      (x)
73#define pgd_val(x)      (x)
74#define pgprot_val(x)   (x)
75
76#define __pte(x)        (x)
77#define __pgd(x)        (x)
78#define __pgprot(x)     (x)
79
80#endif /* STRICT_MM_TYPECHECKS */
81
82#define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
83#if CONFIG_PGTABLE_LEVELS == 3
84#define set_pud(pudptr, pudval) (*(pudptr) = (pudval))
85#endif
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	2
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#ifdef CONFIG_HUGETLB_PAGE
151#define HPAGE_SHIFT		PMD_SHIFT /* fixed for transparent huge pages */
152#define HPAGE_SIZE      	((1UL) << HPAGE_SHIFT)
153#define HPAGE_MASK		(~(HPAGE_SIZE - 1))
154#define HUGETLB_PAGE_ORDER	(HPAGE_SHIFT - PAGE_SHIFT)
155
156#if defined(CONFIG_64BIT) && defined(CONFIG_PARISC_PAGE_SIZE_4KB)
157# define REAL_HPAGE_SHIFT	20 /* 20 = 1MB */
158# define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_1M
159#elif !defined(CONFIG_64BIT) && defined(CONFIG_PARISC_PAGE_SIZE_4KB)
160# define REAL_HPAGE_SHIFT	22 /* 22 = 4MB */
161# define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_4M
162#else
163# define REAL_HPAGE_SHIFT	24 /* 24 = 16MB */
164# define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_16M
165#endif
166#endif /* CONFIG_HUGETLB_PAGE */
167
168#define virt_addr_valid(kaddr)	pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
169
170#define page_to_phys(page)	(page_to_pfn(page) << PAGE_SHIFT)
171#define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
172
173#include <asm-generic/memory_model.h>
174#include <asm-generic/getorder.h>
175#include <asm/pdc.h>
176
177#define PAGE0   ((struct zeropage *)absolute_pointer(__PAGE_OFFSET))
178
179/* DEFINITION OF THE ZERO-PAGE (PAG0) */
180/* based on work by Jason Eckhardt (jason@equator.com) */
181
182#endif /* _PARISC_PAGE_H */
183