1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
|
/*
* linux/include/asm-xtensa/page.h
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version2 as
* published by the Free Software Foundation.
*
* Copyright (C) 2001 - 2005 Tensilica Inc.
*/
#ifndef _XTENSA_PAGE_H
#define _XTENSA_PAGE_H
#ifdef __KERNEL__
#include <asm/processor.h>
#define XCHAL_KSEG_CACHED_VADDR 0xd0000000
#define XCHAL_KSEG_BYPASS_VADDR 0xd8000000
#define XCHAL_KSEG_PADDR 0x00000000
#define XCHAL_KSEG_SIZE 0x08000000
/*
* PAGE_SHIFT determines the page size
* PAGE_ALIGN(x) aligns the pointer to the (next) page boundary
*/
#define PAGE_SHIFT 12
#define PAGE_SIZE (1 << PAGE_SHIFT)
#define PAGE_MASK (~(PAGE_SIZE-1))
#define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE - 1) & PAGE_MASK)
#define PAGE_OFFSET XCHAL_KSEG_CACHED_VADDR
#define MAX_MEM_PFN XCHAL_KSEG_SIZE
#define PGTABLE_START 0x80000000
#ifdef __ASSEMBLY__
#define __pgprot(x) (x)
#else
/*
* These are used to make use of C type-checking..
*/
typedef struct { unsigned long pte; } pte_t; /* page table entry */
typedef struct { unsigned long pgd; } pgd_t; /* PGD table entry */
typedef struct { unsigned long pgprot; } pgprot_t;
#define pte_val(x) ((x).pte)
#define pgd_val(x) ((x).pgd)
#define pgprot_val(x) ((x).pgprot)
#define __pte(x) ((pte_t) { (x) } )
#define __pgd(x) ((pgd_t) { (x) } )
#define __pgprot(x) ((pgprot_t) { (x) } )
/*
* Pure 2^n version of get_order
*/
static inline int get_order(unsigned long size)
{
int order;
#ifndef XCHAL_HAVE_NSU
unsigned long x1, x2, x4, x8, x16;
size = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
x1 = size & 0xAAAAAAAA;
x2 = size & 0xCCCCCCCC;
x4 = size & 0xF0F0F0F0;
x8 = size & 0xFF00FF00;
x16 = size & 0xFFFF0000;
order = x2 ? 2 : 0;
order += (x16 != 0) * 16;
order += (x8 != 0) * 8;
order += (x4 != 0) * 4;
order += (x1 != 0);
return order;
#else
size = (size - 1) >> PAGE_SHIFT;
asm ("nsau %0, %1" : "=r" (order) : "r" (size));
return 32 - order;
#endif
}
struct page;
extern void clear_page(void *page);
extern void copy_page(void *to, void *from);
/*
* If we have cache aliasing and writeback caches, we might have to do
* some extra work
*/
#if (DCACHE_WAY_SIZE > PAGE_SIZE)
void clear_user_page(void *addr, unsigned long vaddr, struct page* page);
void copy_user_page(void *to,void* from,unsigned long vaddr,struct page* page);
#else
# define clear_user_page(page,vaddr,pg) clear_page(page)
# define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
#endif
/*
* This handles the memory map. We handle pages at
* XCHAL_KSEG_CACHED_VADDR for kernels with 32 bit address space.
* These macros are for conversion of kernel address, not user
* addresses.
*/
#define __pa(x) ((unsigned long) (x) - PAGE_OFFSET)
#define __va(x) ((void *)((unsigned long) (x) + PAGE_OFFSET))
#define pfn_valid(pfn) ((unsigned long)pfn < max_mapnr)
#ifdef CONFIG_DISCONTIGMEM
# error CONFIG_DISCONTIGMEM not supported
#endif
#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
#define page_to_virt(page) __va(page_to_pfn(page) << PAGE_SHIFT)
#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
#define WANT_PAGE_VIRTUAL
#endif /* __ASSEMBLY__ */
#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
#include <asm-generic/memory_model.h>
#endif /* __KERNEL__ */
#endif /* _XTENSA_PAGE_H */
|
