tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#ifndef _PARISC_PAGE_H
2#define _PARISC_PAGE_H
3
4/* PAGE_SHIFT determines the page size */
5#define PAGE_SHIFT 12
6#define PAGE_SIZE (1UL << PAGE_SHIFT)
7#define PAGE_MASK (~(PAGE_SIZE-1))
8
9#ifdef __KERNEL__
10#include <linux/config.h>
11#ifndef __ASSEMBLY__
12
13#include <asm/types.h>
14#include <asm/cache.h>
15
16#define clear_page(page) memset((void *)(page), 0, PAGE_SIZE)
17#define copy_page(to,from) copy_user_page_asm((void *)(to), (void *)(from))
18
19struct page;
20
21extern void purge_kernel_dcache_page(unsigned long);
22extern void copy_user_page_asm(void *to, void *from);
23extern void clear_user_page_asm(void *page, unsigned long vaddr);
24
25static inline void
26copy_user_page(void *vto, void *vfrom, unsigned long vaddr, struct page *pg)
27{
28 copy_user_page_asm(vto, vfrom);
29 flush_kernel_dcache_page(vto);
30 /* XXX: ppc flushes icache too, should we? */
31}
32
33static inline void
34clear_user_page(void *page, unsigned long vaddr, struct page *pg)
35{
36 purge_kernel_dcache_page((unsigned long)page);
37 clear_user_page_asm(page, vaddr);
38}
39
40/*
41 * These are used to make use of C type-checking..
42 */
43#ifdef __LP64__
44typedef struct { unsigned long pte; } pte_t;
45#else
46typedef struct {
47 unsigned long pte;
48 unsigned long flags;
49} pte_t;
50#endif
51/* NOTE: even on 64 bits, these entries are __u32 because we allocate
52 * the pmd and pgd in ZONE_DMA (i.e. under 4GB) */
53typedef struct { __u32 pmd; } pmd_t;
54typedef struct { __u32 pgd; } pgd_t;
55typedef struct { unsigned long pgprot; } pgprot_t;
56
57#define pte_val(x) ((x).pte)
58#ifdef __LP64__
59#define pte_flags(x) (*(__u32 *)&((x).pte))
60#else
61#define pte_flags(x) ((x).flags)
62#endif
63
64/* These do not work lvalues, so make sure we don't use them as such. */
65#define pmd_val(x) ((x).pmd + 0)
66#define pgd_val(x) ((x).pgd + 0)
67#define pgprot_val(x) ((x).pgprot)
68
69#define __pmd_val_set(x,n) (x).pmd = (n)
70#define __pgd_val_set(x,n) (x).pgd = (n)
71
72#define __pte(x) ((pte_t) { (x) } )
73#define __pmd(x) ((pmd_t) { (x) } )
74#define __pgd(x) ((pgd_t) { (x) } )
75#define __pgprot(x) ((pgprot_t) { (x) } )
76
77/* Pure 2^n version of get_order */
78extern __inline__ int get_order(unsigned long size)
79{
80 int order;
81
82 size = (size-1) >> (PAGE_SHIFT-1);
83 order = -1;
84 do {
85 size >>= 1;
86 order++;
87 } while (size);
88 return order;
89}
90
91typedef struct __physmem_range {
92 unsigned long start_pfn;
93 unsigned long pages; /* PAGE_SIZE pages */
94} physmem_range_t;
95
96extern physmem_range_t pmem_ranges[];
97extern int npmem_ranges;
98
99#endif /* !__ASSEMBLY__ */
100
101/* WARNING: The definitions below must match exactly to sizeof(pte_t)
102 * etc
103 */
104#ifdef __LP64__
105#define BITS_PER_PTE_ENTRY 3
106#define BITS_PER_PMD_ENTRY 2
107#define BITS_PER_PGD_ENTRY 2
108#else
109#define BITS_PER_PTE_ENTRY 3
110#define BITS_PER_PMD_ENTRY 2
111#define BITS_PER_PGD_ENTRY BITS_PER_PMD_ENTRY
112#endif
113#define PGD_ENTRY_SIZE (1UL << BITS_PER_PGD_ENTRY)
114#define PMD_ENTRY_SIZE (1UL << BITS_PER_PMD_ENTRY)
115#define PTE_ENTRY_SIZE (1UL << BITS_PER_PTE_ENTRY)
116
117/* to align the pointer to the (next) page boundary */
118#define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
119
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#define __PAGE_OFFSET (0x10000000)
127
128#define PAGE_OFFSET ((unsigned long)__PAGE_OFFSET)
129
130/* The size of the gateway page (we leave lots of room for expansion) */
131#define GATEWAY_PAGE_SIZE 0x4000
132
133/* The start of the actual kernel binary---used in vmlinux.lds.S
134 * Leave some space after __PAGE_OFFSET for detecting kernel null
135 * ptr derefs */
136#define KERNEL_BINARY_TEXT_START (__PAGE_OFFSET + 0x100000)
137
138/* These macros don't work for 64-bit C code -- don't allow in C at all */
139#ifdef __ASSEMBLY__
140# define PA(x) ((x)-__PAGE_OFFSET)
141# define VA(x) ((x)+__PAGE_OFFSET)
142#endif
143#define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
144#define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
145
146#ifndef CONFIG_DISCONTIGMEM
147#define pfn_to_page(pfn) (mem_map + (pfn))
148#define page_to_pfn(page) ((unsigned long)((page) - mem_map))
149#define pfn_valid(pfn) ((pfn) < max_mapnr)
150#endif /* CONFIG_DISCONTIGMEM */
151
152#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
153
154#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
155#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
156
157#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
158 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
159
160#endif /* __KERNEL__ */
161
162#endif /* _PARISC_PAGE_H */