1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License.  See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1994 - 1999, 2000, 03 Ralf Baechle
7 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
8 */
9#ifndef _ASM_PAGE_H
10#define _ASM_PAGE_H
11
12#include <spaces.h>
13#include <linux/const.h>
14#include <linux/kernel.h>
15#include <asm/mipsregs.h>
16
17/*
18 * PAGE_SHIFT determines the page size
19 */
20#ifdef CONFIG_PAGE_SIZE_4KB
21#define PAGE_SHIFT	12
22#endif
23#ifdef CONFIG_PAGE_SIZE_8KB
24#define PAGE_SHIFT	13
25#endif
26#ifdef CONFIG_PAGE_SIZE_16KB
27#define PAGE_SHIFT	14
28#endif
29#ifdef CONFIG_PAGE_SIZE_32KB
30#define PAGE_SHIFT	15
31#endif
32#ifdef CONFIG_PAGE_SIZE_64KB
33#define PAGE_SHIFT	16
34#endif
35#define PAGE_SIZE	(_AC(1,UL) << PAGE_SHIFT)
36#define PAGE_MASK	(~((1 << PAGE_SHIFT) - 1))
37
38/*
39 * This is used for calculating the real page sizes
40 * for FTLB or VTLB + FTLB configurations.
41 */
42static inline unsigned int page_size_ftlb(unsigned int mmuextdef)
43{
44	switch (mmuextdef) {
45	case MIPS_CONF4_MMUEXTDEF_FTLBSIZEEXT:
46		if (PAGE_SIZE == (1 << 30))
47			return 5;
48		if (PAGE_SIZE == (1llu << 32))
49			return 6;
50		if (PAGE_SIZE > (256 << 10))
51			return 7; /* reserved */
52			/* fall through */
53	case MIPS_CONF4_MMUEXTDEF_VTLBSIZEEXT:
54		return (PAGE_SHIFT - 10) / 2;
55	default:
56		panic("Invalid FTLB configuration with Conf4_mmuextdef=%d value\n",
57		      mmuextdef >> 14);
58	}
59}
60
61#ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
62#define HPAGE_SHIFT	(PAGE_SHIFT + PAGE_SHIFT - 3)
63#define HPAGE_SIZE	(_AC(1,UL) << HPAGE_SHIFT)
64#define HPAGE_MASK	(~(HPAGE_SIZE - 1))
65#define HUGETLB_PAGE_ORDER	(HPAGE_SHIFT - PAGE_SHIFT)
66#else /* !CONFIG_MIPS_HUGE_TLB_SUPPORT */
67#define HPAGE_SHIFT	({BUILD_BUG(); 0; })
68#define HPAGE_SIZE	({BUILD_BUG(); 0; })
69#define HPAGE_MASK	({BUILD_BUG(); 0; })
70#define HUGETLB_PAGE_ORDER	({BUILD_BUG(); 0; })
71#endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */
72
73#include <linux/pfn.h>
74
75extern void build_clear_page(void);
76extern void build_copy_page(void);
77
78/*
79 * It's normally defined only for FLATMEM config but it's
80 * used in our early mem init code for all memory models.
81 * So always define it.
82 */
83#define ARCH_PFN_OFFSET		PFN_UP(PHYS_OFFSET)
84
85extern void clear_page(void * page);
86extern void copy_page(void * to, void * from);
87
88extern unsigned long shm_align_mask;
89
90static inline unsigned long pages_do_alias(unsigned long addr1,
91	unsigned long addr2)
92{
93	return (addr1 ^ addr2) & shm_align_mask;
94}
95
96struct page;
97
98static inline void clear_user_page(void *addr, unsigned long vaddr,
99	struct page *page)
100{
101	extern void (*flush_data_cache_page)(unsigned long addr);
102
103	clear_page(addr);
104	if (pages_do_alias((unsigned long) addr, vaddr & PAGE_MASK))
105		flush_data_cache_page((unsigned long)addr);
106}
107
108struct vm_area_struct;
109extern void copy_user_highpage(struct page *to, struct page *from,
110	unsigned long vaddr, struct vm_area_struct *vma);
111
112#define __HAVE_ARCH_COPY_USER_HIGHPAGE
113
114/*
115 * These are used to make use of C type-checking..
116 */
117#ifdef CONFIG_PHYS_ADDR_T_64BIT
118  #ifdef CONFIG_CPU_MIPS32
119    typedef struct { unsigned long pte_low, pte_high; } pte_t;
120    #define pte_val(x)	  ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
121    #define __pte(x)	  ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
122  #else
123     typedef struct { unsigned long long pte; } pte_t;
124     #define pte_val(x) ((x).pte)
125     #define __pte(x)	((pte_t) { (x) } )
126  #endif
127#else
128typedef struct { unsigned long pte; } pte_t;
129#define pte_val(x)	((x).pte)
130#define __pte(x)	((pte_t) { (x) } )
131#endif
132typedef struct page *pgtable_t;
133
134/*
135 * Right now we don't support 4-level pagetables, so all pud-related
136 * definitions come from <asm-generic/pgtable-nopud.h>.
137 */
138
139/*
140 * Finall the top of the hierarchy, the pgd
141 */
142typedef struct { unsigned long pgd; } pgd_t;
143#define pgd_val(x)	((x).pgd)
144#define __pgd(x)	((pgd_t) { (x) } )
145
146/*
147 * Manipulate page protection bits
148 */
149typedef struct { unsigned long pgprot; } pgprot_t;
150#define pgprot_val(x)	((x).pgprot)
151#define __pgprot(x)	((pgprot_t) { (x) } )
152
153/*
154 * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd
155 * pair of pages we only have a single global bit per pair of pages.  When
156 * writing to the TLB make sure we always have the bit set for both pages
157 * or none.  This macro is used to access the `buddy' of the pte we're just
158 * working on.
159 */
160#define ptep_buddy(x)	((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
161
162/*
163 * __pa()/__va() should be used only during mem init.
164 */
165#ifdef CONFIG_64BIT
166#define __pa(x)								\
167({									\
168    unsigned long __x = (unsigned long)(x);				\
169    __x < CKSEG0 ? XPHYSADDR(__x) : CPHYSADDR(__x);			\
170})
171#else
172#define __pa(x)								\
173    ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET)
174#endif
175#define __va(x)		((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET))
176#include <asm/io.h>
177
178/*
179 * RELOC_HIDE was originally added by 6007b903dfe5f1d13e0c711ac2894bdd4a61b1ad
180 * (lmo) rsp. 8431fd094d625b94d364fe393076ccef88e6ce18 (kernel.org).  The
181 * discussion can be found in lkml posting
182 * <a2ebde260608230500o3407b108hc03debb9da6e62c@mail.gmail.com> which is
183 * archived at http://lists.linuxcoding.com/kernel/2006-q3/msg17360.html
184 *
185 * It is unclear if the misscompilations mentioned in
186 * http://lkml.org/lkml/2010/8/8/138 also affect MIPS so we keep this one
187 * until GCC 3.x has been retired before we can apply
188 * https://patchwork.linux-mips.org/patch/1541/
189 */
190
191#ifndef __pa_symbol
192#define __pa_symbol(x)	__pa(RELOC_HIDE((unsigned long)(x), 0))
193#endif
194
195#define pfn_to_kaddr(pfn)	__va((pfn) << PAGE_SHIFT)
196
197#ifdef CONFIG_FLATMEM
198
199static inline int pfn_valid(unsigned long pfn)
200{
201	/* avoid <linux/mm.h> include hell */
202	extern unsigned long max_mapnr;
203
204	return pfn >= ARCH_PFN_OFFSET && pfn < max_mapnr;
205}
206
207#elif defined(CONFIG_SPARSEMEM)
208
209/* pfn_valid is defined in linux/mmzone.h */
210
211#elif defined(CONFIG_NEED_MULTIPLE_NODES)
212
213#define pfn_valid(pfn)							\
214({									\
215	unsigned long __pfn = (pfn);					\
216	int __n = pfn_to_nid(__pfn);					\
217	((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn +		\
218			       NODE_DATA(__n)->node_spanned_pages)	\
219		    : 0);						\
220})
221
222#endif
223
224#define virt_to_page(kaddr)	pfn_to_page(PFN_DOWN(virt_to_phys((void *)     \
225								  (kaddr))))
226
227extern int __virt_addr_valid(const volatile void *kaddr);
228#define virt_addr_valid(kaddr)						\
229	__virt_addr_valid((const volatile void *) (kaddr))
230
231#define VM_DATA_DEFAULT_FLAGS	(VM_READ | VM_WRITE | VM_EXEC | \
232				 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
233
234#define UNCAC_ADDR(addr)	((addr) - PAGE_OFFSET + UNCAC_BASE)
235#define CAC_ADDR(addr)		((addr) - UNCAC_BASE + PAGE_OFFSET)
236
237#include <asm-generic/memory_model.h>
238#include <asm-generic/getorder.h>
239
240#endif /* _ASM_PAGE_H */
241