page.h

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