1 /* SPDX-License-Identifier: GPL-2.0 */
5 #include <linux/const.h>
7 #if defined(CONFIG_PARISC_PAGE_SIZE_4KB)
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
14 # error "unknown default kernel page size"
16 #define PAGE_SIZE (_AC(1,UL) << PAGE_SHIFT)
17 #define PAGE_MASK (~(PAGE_SIZE-1))
22 #include <asm/types.h>
23 #include <asm/cache.h>
25 #define clear_page(page) clear_page_asm((void *)(page))
26 #define copy_page(to, from) copy_page_asm((void *)(to), (void *)(from))
30 void clear_page_asm(void *page);
31 void copy_page_asm(void *to, void *from);
32 #define clear_user_page(vto, vaddr, page) clear_page_asm(vto)
33 void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
37 * These are used to make use of C type-checking..
39 #define STRICT_MM_TYPECHECKS
40 #ifdef STRICT_MM_TYPECHECKS
41 typedef struct { unsigned long pte; } pte_t; /* either 32 or 64bit */
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) */
45 typedef struct { __u32 pgd; } pgd_t;
46 typedef struct { unsigned long pgprot; } pgprot_t;
48 #if CONFIG_PGTABLE_LEVELS == 3
49 typedef 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)
55 #define pte_val(x) ((x).pte)
56 #define pgd_val(x) ((x).pgd + 0)
57 #define pgprot_val(x) ((x).pgprot)
59 #define __pte(x) ((pte_t) { (x) } )
60 #define __pgd(x) ((pgd_t) { (x) } )
61 #define __pgprot(x) ((pgprot_t) { (x) } )
65 * .. while these make it easier on the compiler
67 typedef unsigned long pte_t;
69 #if CONFIG_PGTABLE_LEVELS == 3
71 #define pmd_val(x) (x)
76 typedef unsigned long pgprot_t;
78 #define pte_val(x) (x)
79 #define pgd_val(x) (x)
80 #define pgprot_val(x) (x)
84 #define __pgprot(x) (x)
86 #endif /* STRICT_MM_TYPECHECKS */
88 #define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
89 #if CONFIG_PGTABLE_LEVELS == 3
90 #define set_pud(pudptr, pudval) (*(pudptr) = (pudval))
93 typedef struct page *pgtable_t;
95 typedef struct __physmem_range {
96 unsigned long start_pfn;
97 unsigned long pages; /* PAGE_SIZE pages */
100 extern physmem_range_t pmem_ranges[];
101 extern int npmem_ranges;
103 #endif /* !__ASSEMBLY__ */
105 /* WARNING: The definitions below must match exactly to sizeof(pte_t)
109 #define BITS_PER_PTE_ENTRY 3
110 #define BITS_PER_PMD_ENTRY 2
111 #define BITS_PER_PGD_ENTRY 2
113 #define BITS_PER_PTE_ENTRY 2
114 #define BITS_PER_PMD_ENTRY 2
115 #define BITS_PER_PGD_ENTRY 2
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)
121 #define LINUX_GATEWAY_SPACE 0
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 */
127 #define __PAGE_OFFSET_DEFAULT (0x40000000) /* 1GB */
129 #define __PAGE_OFFSET_DEFAULT (0x10000000) /* 256MB */
132 #if defined(BOOTLOADER)
133 #define __PAGE_OFFSET (0) /* bootloader uses physical addresses */
135 #define __PAGE_OFFSET __PAGE_OFFSET_DEFAULT
136 #endif /* BOOTLOADER */
138 #define PAGE_OFFSET ((unsigned long)__PAGE_OFFSET)
140 /* The size of the gateway page (we leave lots of room for expansion) */
141 #define GATEWAY_PAGE_SIZE 0x4000
143 /* The start of the actual kernel binary---used in vmlinux.lds.S
144 * Leave some space after __PAGE_OFFSET for detecting kernel null
146 #define KERNEL_BINARY_TEXT_START (__PAGE_OFFSET + 0x100000)
148 /* These macros don't work for 64-bit C code -- don't allow in C at all */
150 # define PA(x) ((x)-__PAGE_OFFSET)
151 # define VA(x) ((x)+__PAGE_OFFSET)
153 #define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
154 #define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
156 #ifndef CONFIG_SPARSEMEM
157 #define pfn_valid(pfn) ((pfn) < max_mapnr)
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)
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
173 # define REAL_HPAGE_SHIFT 24 /* 24 = 16MB */
174 # define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_16M
176 #endif /* CONFIG_HUGETLB_PAGE */
178 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
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)
183 #include <asm-generic/memory_model.h>
184 #include <asm-generic/getorder.h>
187 #define PAGE0 ((struct zeropage *)__PAGE_OFFSET)
189 /* DEFINITION OF THE ZERO-PAGE (PAG0) */
190 /* based on work by Jason Eckhardt (jason@equator.com) */
192 #endif /* _PARISC_PAGE_H */