1#ifndef _METAG_PAGE_H
2#define _METAG_PAGE_H
3
4#include <linux/const.h>
5
6#include <asm/metag_mem.h>
7
8/* PAGE_SHIFT determines the page size */
9#if defined(CONFIG_PAGE_SIZE_4K)
10#define PAGE_SHIFT	12
11#elif defined(CONFIG_PAGE_SIZE_8K)
12#define PAGE_SHIFT	13
13#elif defined(CONFIG_PAGE_SIZE_16K)
14#define PAGE_SHIFT	14
15#endif
16
17#define PAGE_SIZE	(_AC(1, UL) << PAGE_SHIFT)
18#define PAGE_MASK	(~(PAGE_SIZE-1))
19
20#if defined(CONFIG_HUGETLB_PAGE_SIZE_8K)
21# define HPAGE_SHIFT	13
22#elif defined(CONFIG_HUGETLB_PAGE_SIZE_16K)
23# define HPAGE_SHIFT	14
24#elif defined(CONFIG_HUGETLB_PAGE_SIZE_32K)
25# define HPAGE_SHIFT	15
26#elif defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
27# define HPAGE_SHIFT	16
28#elif defined(CONFIG_HUGETLB_PAGE_SIZE_128K)
29# define HPAGE_SHIFT	17
30#elif defined(CONFIG_HUGETLB_PAGE_SIZE_256K)
31# define HPAGE_SHIFT	18
32#elif defined(CONFIG_HUGETLB_PAGE_SIZE_512K)
33# define HPAGE_SHIFT	19
34#elif defined(CONFIG_HUGETLB_PAGE_SIZE_1M)
35# define HPAGE_SHIFT	20
36#elif defined(CONFIG_HUGETLB_PAGE_SIZE_2M)
37# define HPAGE_SHIFT	21
38#elif defined(CONFIG_HUGETLB_PAGE_SIZE_4M)
39# define HPAGE_SHIFT	22
40#endif
41
42#ifdef CONFIG_HUGETLB_PAGE
43# define HPAGE_SIZE		(1UL << HPAGE_SHIFT)
44# define HPAGE_MASK		(~(HPAGE_SIZE-1))
45# define HUGETLB_PAGE_ORDER	(HPAGE_SHIFT-PAGE_SHIFT)
46/*
47 * We define our own hugetlb_get_unmapped_area so we don't corrupt 2nd level
48 * page tables with normal pages in them.
49 */
50# define HUGEPT_SHIFT		(22)
51# define HUGEPT_ALIGN		(1 << HUGEPT_SHIFT)
52# define HUGEPT_MASK		(HUGEPT_ALIGN - 1)
53# define ALIGN_HUGEPT(x)	ALIGN(x, HUGEPT_ALIGN)
54# define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
55#endif
56
57#ifndef __ASSEMBLY__
58
59/* On the Meta, we would like to know if the address (heap) we have is
60 * in local or global space.
61 */
62#define is_global_space(addr)	((addr) > 0x7fffffff)
63#define is_local_space(addr)	(!is_global_space(addr))
64
65extern void clear_page(void *to);
66extern void copy_page(void *to, void *from);
67
68#define clear_user_page(page, vaddr, pg)        clear_page(page)
69#define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
70
71/*
72 * These are used to make use of C type-checking..
73 */
74typedef struct { unsigned long pte; } pte_t;
75typedef struct { unsigned long pgd; } pgd_t;
76typedef struct { unsigned long pgprot; } pgprot_t;
77typedef struct page *pgtable_t;
78
79#define pte_val(x)	((x).pte)
80#define pgd_val(x)	((x).pgd)
81#define pgprot_val(x)	((x).pgprot)
82
83#define __pte(x)	((pte_t) { (x) })
84#define __pgd(x)	((pgd_t) { (x) })
85#define __pgprot(x)	((pgprot_t) { (x) })
86
87/* The kernel must now ALWAYS live at either 0xC0000000 or 0x40000000 - that
88 * being either global or local space.
89 */
90#define PAGE_OFFSET		(CONFIG_PAGE_OFFSET)
91
92#if PAGE_OFFSET >= LINGLOBAL_BASE
93#define META_MEMORY_BASE  LINGLOBAL_BASE
94#define META_MEMORY_LIMIT LINGLOBAL_LIMIT
95#else
96#define META_MEMORY_BASE  LINLOCAL_BASE
97#define META_MEMORY_LIMIT LINLOCAL_LIMIT
98#endif
99
100/* Offset between physical and virtual mapping of kernel memory. */
101extern unsigned int meta_memoffset;
102
103#define __pa(x) ((unsigned long)(((unsigned long)(x)) - meta_memoffset))
104#define __va(x) ((void *)((unsigned long)(((unsigned long)(x)) + meta_memoffset)))
105
106extern unsigned long pfn_base;
107#define ARCH_PFN_OFFSET         (pfn_base)
108#define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
109#define page_to_virt(page)      __va(page_to_pfn(page) << PAGE_SHIFT)
110#define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
111#define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
112#ifdef CONFIG_FLATMEM
113extern unsigned long max_pfn;
114extern unsigned long min_low_pfn;
115#define pfn_valid(pfn)		((pfn) >= min_low_pfn && (pfn) < max_pfn)
116#endif
117
118#define pfn_to_kaddr(pfn)	__va((pfn) << PAGE_SHIFT)
119
120#define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
121				 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
122
123#include <asm-generic/memory_model.h>
124#include <asm-generic/getorder.h>
125
126#endif /* __ASSMEBLY__ */
127
128#endif /* _METAG_PAGE_H */
129