summaryrefslogtreecommitdiffstats
path: root/include/asm-ppc64/page.h
blob: 86219574c1a53cdf5f940a64bade4e4ea3073255 (plain)
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
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
#ifndef _PPC64_PAGE_H
#define _PPC64_PAGE_H

/*
 * Copyright (C) 2001 PPC64 Team, IBM Corp
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#include <linux/config.h>

#ifdef __ASSEMBLY__
  #define ASM_CONST(x) x
#else
  #define __ASM_CONST(x) x##UL
  #define ASM_CONST(x) __ASM_CONST(x)
#endif

/* PAGE_SHIFT determines the page size */
#define PAGE_SHIFT	12
#define PAGE_SIZE	(ASM_CONST(1) << PAGE_SHIFT)
#define PAGE_MASK	(~(PAGE_SIZE-1))
#define PAGE_OFFSET_MASK (PAGE_SIZE-1)

#define SID_SHIFT       28
#define SID_MASK        0xfffffffffUL
#define ESID_MASK	0xfffffffff0000000UL
#define GET_ESID(x)     (((x) >> SID_SHIFT) & SID_MASK)

#define HPAGE_SHIFT	24
#define HPAGE_SIZE	((1UL) << HPAGE_SHIFT)
#define HPAGE_MASK	(~(HPAGE_SIZE - 1))

#ifdef CONFIG_HUGETLB_PAGE

#define HUGETLB_PAGE_ORDER	(HPAGE_SHIFT - PAGE_SHIFT)

/* For 64-bit processes the hugepage range is 1T-1.5T */
#define TASK_HPAGE_BASE ASM_CONST(0x0000010000000000)
#define TASK_HPAGE_END 	ASM_CONST(0x0000018000000000)

#define LOW_ESID_MASK(addr, len)	(((1U << (GET_ESID(addr+len-1)+1)) \
	   	                	- (1U << GET_ESID(addr))) & 0xffff)

#define ARCH_HAS_HUGEPAGE_ONLY_RANGE
#define ARCH_HAS_PREPARE_HUGEPAGE_RANGE

#define touches_hugepage_low_range(mm, addr, len) \
	(LOW_ESID_MASK((addr), (len)) & mm->context.htlb_segs)
#define touches_hugepage_high_range(addr, len) \
	(((addr) > (TASK_HPAGE_BASE-(len))) && ((addr) < TASK_HPAGE_END))

#define __within_hugepage_low_range(addr, len, segmask) \
	((LOW_ESID_MASK((addr), (len)) | (segmask)) == (segmask))
#define within_hugepage_low_range(addr, len) \
	__within_hugepage_low_range((addr), (len), \
				    current->mm->context.htlb_segs)
#define within_hugepage_high_range(addr, len) (((addr) >= TASK_HPAGE_BASE) \
	  && ((addr)+(len) <= TASK_HPAGE_END) && ((addr)+(len) >= (addr)))

#define is_hugepage_only_range(mm, addr, len) \
	(touches_hugepage_high_range((addr), (len)) || \
	  touches_hugepage_low_range((mm), (addr), (len)))
#define HAVE_ARCH_HUGETLB_UNMAPPED_AREA

#define in_hugepage_area(context, addr) \
	(cpu_has_feature(CPU_FTR_16M_PAGE) && \
	 ( (((addr) >= TASK_HPAGE_BASE) && ((addr) < TASK_HPAGE_END)) || \
	   ( ((addr) < 0x100000000L) && \
	     ((1 << GET_ESID(addr)) & (context).htlb_segs) ) ) )

#else /* !CONFIG_HUGETLB_PAGE */

#define in_hugepage_area(mm, addr)	0

#endif /* !CONFIG_HUGETLB_PAGE */

/* align addr on a size boundary - adjust address up/down if needed */
#define _ALIGN_UP(addr,size)	(((addr)+((size)-1))&(~((size)-1)))
#define _ALIGN_DOWN(addr,size)	((addr)&(~((size)-1)))

/* align addr on a size boundary - adjust address up if needed */
#define _ALIGN(addr,size)     _ALIGN_UP(addr,size)

/* to align the pointer to the (next) double word boundary */
#define DOUBLEWORD_ALIGN(addr)	_ALIGN(addr,sizeof(unsigned long))

/* to align the pointer to the (next) page boundary */
#define PAGE_ALIGN(addr)	_ALIGN(addr, PAGE_SIZE)

#ifdef __KERNEL__
#ifndef __ASSEMBLY__
#include <asm/cache.h>

#undef STRICT_MM_TYPECHECKS

#define REGION_SIZE   4UL
#define REGION_SHIFT  60UL
#define REGION_MASK   (((1UL<<REGION_SIZE)-1UL)<<REGION_SHIFT)
#define REGION_STRIDE (1UL << REGION_SHIFT)

static __inline__ void clear_page(void *addr)
{
	unsigned long lines, line_size;

	line_size = ppc64_caches.dline_size;
	lines = ppc64_caches.dlines_per_page;

	__asm__ __volatile__(
	"mtctr  	%1	# clear_page\n\
1:      dcbz  	0,%0\n\
	add	%0,%0,%3\n\
	bdnz+	1b"
        : "=r" (addr)
        : "r" (lines), "0" (addr), "r" (line_size)
	: "ctr", "memory");
}

extern void copy_page(void *to, void *from);
struct page;
extern void clear_user_page(void *page, unsigned long vaddr, struct page *pg);
extern void copy_user_page(void *to, void *from, unsigned long vaddr, struct page *p);

#ifdef STRICT_MM_TYPECHECKS
/*
 * These are used to make use of C type-checking.  
 * Entries in the pte table are 64b, while entries in the pgd & pmd are 32b.
 */
typedef struct { unsigned long pte; } pte_t;
typedef struct { unsigned int  pmd; } pmd_t;
typedef struct { unsigned int  pgd; } pgd_t;
typedef struct { unsigned long pgprot; } pgprot_t;

#define pte_val(x)	((x).pte)
#define pmd_val(x)	((x).pmd)
#define pgd_val(x)	((x).pgd)
#define pgprot_val(x)	((x).pgprot)

#define __pte(x)	((pte_t) { (x) } )
#define __pmd(x)	((pmd_t) { (x) } )
#define __pgd(x)	((pgd_t) { (x) } )
#define __pgprot(x)	((pgprot_t) { (x) } )

#else
/*
 * .. while these make it easier on the compiler
 */
typedef unsigned long pte_t;
typedef unsigned int  pmd_t;
typedef unsigned int  pgd_t;
typedef unsigned long pgprot_t;

#define pte_val(x)	(x)
#define pmd_val(x)	(x)
#define pgd_val(x)	(x)
#define pgprot_val(x)	(x)

#define __pte(x)	(x)
#define __pmd(x)	(x)
#define __pgd(x)	(x)
#define __pgprot(x)	(x)

#endif

/* Pure 2^n version of get_order */
static inline int get_order(unsigned long size)
{
	int order;

	size = (size-1) >> (PAGE_SHIFT-1);
	order = -1;
	do {
		size >>= 1;
		order++;
	} while (size);
	return order;
}

#define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)

extern int page_is_ram(unsigned long pfn);

extern u64 ppc64_pft_size;		/* Log 2 of page table size */

/* We do define AT_SYSINFO_EHDR but don't use the gate mecanism */
#define __HAVE_ARCH_GATE_AREA		1

#endif /* __ASSEMBLY__ */

#ifdef MODULE
#define __page_aligned __attribute__((__aligned__(PAGE_SIZE)))
#else
#define __page_aligned \
	__attribute__((__aligned__(PAGE_SIZE), \
		__section__(".data.page_aligned")))
#endif


/* This must match the -Ttext linker address            */
/* Note: tophys & tovirt make assumptions about how     */
/*       KERNELBASE is defined for performance reasons. */
/*       When KERNELBASE moves, those macros may have   */
/*             to change!                               */
#define PAGE_OFFSET     ASM_CONST(0xC000000000000000)
#define KERNELBASE      PAGE_OFFSET
#define VMALLOCBASE     ASM_CONST(0xD000000000000000)
#define IOREGIONBASE    ASM_CONST(0xE000000000000000)

#define IO_REGION_ID       (IOREGIONBASE>>REGION_SHIFT)
#define VMALLOC_REGION_ID  (VMALLOCBASE>>REGION_SHIFT)
#define KERNEL_REGION_ID   (KERNELBASE>>REGION_SHIFT)
#define USER_REGION_ID     (0UL)
#define REGION_ID(X)	   (((unsigned long)(X))>>REGION_SHIFT)

#define __bpn_to_ba(x) ((((unsigned long)(x))<<PAGE_SHIFT) + KERNELBASE)
#define __ba_to_bpn(x) ((((unsigned long)(x)) & ~REGION_MASK) >> PAGE_SHIFT)

#define __va(x) ((void *)((unsigned long)(x) + KERNELBASE))

#ifdef CONFIG_DISCONTIGMEM
#define page_to_pfn(page)	discontigmem_page_to_pfn(page)
#define pfn_to_page(pfn)	discontigmem_pfn_to_page(pfn)
#define pfn_valid(pfn)		discontigmem_pfn_valid(pfn)
#else
#define pfn_to_page(pfn)	(mem_map + (pfn))
#define page_to_pfn(page)	((unsigned long)((page) - mem_map))
#define pfn_valid(pfn)		((pfn) < max_mapnr)
#endif

#define virt_to_page(kaddr)	pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
#define pfn_to_kaddr(pfn)	__va((pfn) << PAGE_SHIFT)

#define virt_addr_valid(kaddr)	pfn_valid(__pa(kaddr) >> PAGE_SHIFT)

/*
 * Unfortunately the PLT is in the BSS in the PPC32 ELF ABI,
 * and needs to be executable.  This means the whole heap ends
 * up being executable.
 */
#define VM_DATA_DEFAULT_FLAGS32	(VM_READ | VM_WRITE | VM_EXEC | \
				 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)

#define VM_DATA_DEFAULT_FLAGS64	(VM_READ | VM_WRITE | \
				 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)

#define VM_DATA_DEFAULT_FLAGS \
	(test_thread_flag(TIF_32BIT) ? \
	 VM_DATA_DEFAULT_FLAGS32 : VM_DATA_DEFAULT_FLAGS64)

/*
 * This is the default if a program doesn't have a PT_GNU_STACK
 * program header entry. The PPC64 ELF ABI has a non executable stack
 * stack by default, so in the absense of a PT_GNU_STACK program header
 * we turn execute permission off.
 */
#define VM_STACK_DEFAULT_FLAGS32	(VM_READ | VM_WRITE | VM_EXEC | \
					 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)

#define VM_STACK_DEFAULT_FLAGS64	(VM_READ | VM_WRITE | \
					 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)

#define VM_STACK_DEFAULT_FLAGS \
	(test_thread_flag(TIF_32BIT) ? \
	 VM_STACK_DEFAULT_FLAGS32 : VM_STACK_DEFAULT_FLAGS64)

#endif /* __KERNEL__ */
#endif /* _PPC64_PAGE_H */