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
77typedef struct __physmem_range {
78 unsigned long start_pfn;
79 unsigned long pages; /* PAGE_SIZE pages */
80} physmem_range_t;
81
82extern physmem_range_t pmem_ranges[];
83extern int npmem_ranges;
84
85#endif /* !__ASSEMBLY__ */
86
87/* WARNING: The definitions below must match exactly to sizeof(pte_t)
88 * etc
89 */
90#ifdef __LP64__
91#define BITS_PER_PTE_ENTRY 3
92#define BITS_PER_PMD_ENTRY 2
93#define BITS_PER_PGD_ENTRY 2
94#else
95#define BITS_PER_PTE_ENTRY 3
96#define BITS_PER_PMD_ENTRY 2
97#define BITS_PER_PGD_ENTRY BITS_PER_PMD_ENTRY
98#endif
99#define PGD_ENTRY_SIZE (1UL << BITS_PER_PGD_ENTRY)
100#define PMD_ENTRY_SIZE (1UL << BITS_PER_PMD_ENTRY)
101#define PTE_ENTRY_SIZE (1UL << BITS_PER_PTE_ENTRY)
102
103/* to align the pointer to the (next) page boundary */
104#define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
105
106
107#define LINUX_GATEWAY_SPACE 0
108
109/* This governs the relationship between virtual and physical addresses.
110 * If you alter it, make sure to take care of our various fixed mapping
111 * segments in fixmap.h */
112#define __PAGE_OFFSET (0x10000000)
113
114#define PAGE_OFFSET ((unsigned long)__PAGE_OFFSET)
115
116/* The size of the gateway page (we leave lots of room for expansion) */
117#define GATEWAY_PAGE_SIZE 0x4000
118
119/* The start of the actual kernel binary---used in vmlinux.lds.S
120 * Leave some space after __PAGE_OFFSET for detecting kernel null
121 * ptr derefs */
122#define KERNEL_BINARY_TEXT_START (__PAGE_OFFSET + 0x100000)
123
124/* These macros don't work for 64-bit C code -- don't allow in C at all */
125#ifdef __ASSEMBLY__
126# define PA(x) ((x)-__PAGE_OFFSET)
127# define VA(x) ((x)+__PAGE_OFFSET)
128#endif
129#define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
130#define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
131
132#ifndef CONFIG_DISCONTIGMEM
133#define pfn_to_page(pfn) (mem_map + (pfn))
134#define page_to_pfn(page) ((unsigned long)((page) - mem_map))
135#define pfn_valid(pfn) ((pfn) < max_mapnr)
136#endif /* CONFIG_DISCONTIGMEM */
137
138#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
139
140#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
141#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
142
143#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
144 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
145
146#endif /* __KERNEL__ */
147
148#include <asm-generic/page.h>
149
150#endif /* _PARISC_PAGE_H */