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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2#ifndef _ASM_POWERPC_PAGE_H
3#define _ASM_POWERPC_PAGE_H
4
5/*
6 * Copyright (C) 2001,2005 IBM Corporation.
7 */
8
9#ifndef __ASSEMBLY__
10#include <linux/types.h>
11#include <linux/kernel.h>
12#include <linux/bug.h>
13#else
14#include <asm/types.h>
15#endif
16#include <asm/asm-const.h>
17
18/*
19 * On regular PPC32 page size is 4K (but we support 4K/16K/64K/256K pages
20 * on PPC44x and 4K/16K on 8xx). For PPC64 we support either 4K or 64K software
21 * page size. When using 64K pages however, whether we are really supporting
22 * 64K pages in HW or not is irrelevant to those definitions.
23 */
24#define PAGE_SHIFT CONFIG_PAGE_SHIFT
25#define PAGE_SIZE (ASM_CONST(1) << PAGE_SHIFT)
26
27#ifndef __ASSEMBLY__
28#ifndef CONFIG_HUGETLB_PAGE
29#define HPAGE_SHIFT PAGE_SHIFT
30#elif defined(CONFIG_PPC_BOOK3S_64)
31extern unsigned int hpage_shift;
32#define HPAGE_SHIFT hpage_shift
33#elif defined(CONFIG_PPC_8xx)
34#define HPAGE_SHIFT 19 /* 512k pages */
35#elif defined(CONFIG_PPC_E500)
36#define HPAGE_SHIFT 22 /* 4M pages */
37#endif
38#define HPAGE_SIZE ((1UL) << HPAGE_SHIFT)
39#define HPAGE_MASK (~(HPAGE_SIZE - 1))
40#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
41#define HUGE_MAX_HSTATE (MMU_PAGE_COUNT-1)
42#endif
43
44/*
45 * Subtle: (1 << PAGE_SHIFT) is an int, not an unsigned long. So if we
46 * assign PAGE_MASK to a larger type it gets extended the way we want
47 * (i.e. with 1s in the high bits)
48 */
49#define PAGE_MASK (~((1 << PAGE_SHIFT) - 1))
50
51/*
52 * KERNELBASE is the virtual address of the start of the kernel, it's often
53 * the same as PAGE_OFFSET, but _might not be_.
54 *
55 * The kdump dump kernel is one example where KERNELBASE != PAGE_OFFSET.
56 *
57 * PAGE_OFFSET is the virtual address of the start of lowmem.
58 *
59 * PHYSICAL_START is the physical address of the start of the kernel.
60 *
61 * MEMORY_START is the physical address of the start of lowmem.
62 *
63 * KERNELBASE, PAGE_OFFSET, and PHYSICAL_START are all configurable on
64 * ppc32 and based on how they are set we determine MEMORY_START.
65 *
66 * For the linear mapping the following equation should be true:
67 * KERNELBASE - PAGE_OFFSET = PHYSICAL_START - MEMORY_START
68 *
69 * Also, KERNELBASE >= PAGE_OFFSET and PHYSICAL_START >= MEMORY_START
70 *
71 * There are two ways to determine a physical address from a virtual one:
72 * va = pa + PAGE_OFFSET - MEMORY_START
73 * va = pa + KERNELBASE - PHYSICAL_START
74 *
75 * If you want to know something's offset from the start of the kernel you
76 * should subtract KERNELBASE.
77 *
78 * If you want to test if something's a kernel address, use is_kernel_addr().
79 */
80
81#define KERNELBASE ASM_CONST(CONFIG_KERNEL_START)
82#define PAGE_OFFSET ASM_CONST(CONFIG_PAGE_OFFSET)
83#define LOAD_OFFSET ASM_CONST((CONFIG_KERNEL_START-CONFIG_PHYSICAL_START))
84
85#if defined(CONFIG_NONSTATIC_KERNEL)
86#ifndef __ASSEMBLY__
87
88extern phys_addr_t memstart_addr;
89extern phys_addr_t kernstart_addr;
90
91#if defined(CONFIG_RELOCATABLE) && defined(CONFIG_PPC32)
92extern long long virt_phys_offset;
93#endif
94
95#endif /* __ASSEMBLY__ */
96#define PHYSICAL_START kernstart_addr
97
98#else /* !CONFIG_NONSTATIC_KERNEL */
99#define PHYSICAL_START ASM_CONST(CONFIG_PHYSICAL_START)
100#endif
101
102/* See Description below for VIRT_PHYS_OFFSET */
103#if defined(CONFIG_PPC32) && defined(CONFIG_BOOKE)
104#ifdef CONFIG_RELOCATABLE
105#define VIRT_PHYS_OFFSET virt_phys_offset
106#else
107#define VIRT_PHYS_OFFSET (KERNELBASE - PHYSICAL_START)
108#endif
109#endif
110
111#ifdef CONFIG_PPC64
112#define MEMORY_START 0UL
113#elif defined(CONFIG_NONSTATIC_KERNEL)
114#define MEMORY_START memstart_addr
115#else
116#define MEMORY_START (PHYSICAL_START + PAGE_OFFSET - KERNELBASE)
117#endif
118
119#ifdef CONFIG_FLATMEM
120#define ARCH_PFN_OFFSET ((unsigned long)(MEMORY_START >> PAGE_SHIFT))
121#endif
122
123/*
124 * On Book-E parts we need __va to parse the device tree and we can't
125 * determine MEMORY_START until then. However we can determine PHYSICAL_START
126 * from information at hand (program counter, TLB lookup).
127 *
128 * On BookE with RELOCATABLE && PPC32
129 *
130 * With RELOCATABLE && PPC32, we support loading the kernel at any physical
131 * address without any restriction on the page alignment.
132 *
133 * We find the runtime address of _stext and relocate ourselves based on
134 * the following calculation:
135 *
136 * virtual_base = ALIGN_DOWN(KERNELBASE,256M) +
137 * MODULO(_stext.run,256M)
138 * and create the following mapping:
139 *
140 * ALIGN_DOWN(_stext.run,256M) => ALIGN_DOWN(KERNELBASE,256M)
141 *
142 * When we process relocations, we cannot depend on the
143 * existing equation for the __va()/__pa() translations:
144 *
145 * __va(x) = (x) - PHYSICAL_START + KERNELBASE
146 *
147 * Where:
148 * PHYSICAL_START = kernstart_addr = Physical address of _stext
149 * KERNELBASE = Compiled virtual address of _stext.
150 *
151 * This formula holds true iff, kernel load address is TLB page aligned.
152 *
153 * In our case, we need to also account for the shift in the kernel Virtual
154 * address.
155 *
156 * E.g.,
157 *
158 * Let the kernel be loaded at 64MB and KERNELBASE be 0xc0000000 (same as PAGE_OFFSET).
159 * In this case, we would be mapping 0 to 0xc0000000, and kernstart_addr = 64M
160 *
161 * Now __va(1MB) = (0x100000) - (0x4000000) + 0xc0000000
162 * = 0xbc100000 , which is wrong.
163 *
164 * Rather, it should be : 0xc0000000 + 0x100000 = 0xc0100000
165 * according to our mapping.
166 *
167 * Hence we use the following formula to get the translations right:
168 *
169 * __va(x) = (x) - [ PHYSICAL_START - Effective KERNELBASE ]
170 *
171 * Where :
172 * PHYSICAL_START = dynamic load address.(kernstart_addr variable)
173 * Effective KERNELBASE = virtual_base =
174 * = ALIGN_DOWN(KERNELBASE,256M) +
175 * MODULO(PHYSICAL_START,256M)
176 *
177 * To make the cost of __va() / __pa() more light weight, we introduce
178 * a new variable virt_phys_offset, which will hold :
179 *
180 * virt_phys_offset = Effective KERNELBASE - PHYSICAL_START
181 * = ALIGN_DOWN(KERNELBASE,256M) -
182 * ALIGN_DOWN(PHYSICALSTART,256M)
183 *
184 * Hence :
185 *
186 * __va(x) = x - PHYSICAL_START + Effective KERNELBASE
187 * = x + virt_phys_offset
188 *
189 * and
190 * __pa(x) = x + PHYSICAL_START - Effective KERNELBASE
191 * = x - virt_phys_offset
192 *
193 * On non-Book-E PPC64 PAGE_OFFSET and MEMORY_START are constants so use
194 * the other definitions for __va & __pa.
195 */
196#if defined(CONFIG_PPC32) && defined(CONFIG_BOOKE)
197#define __va(x) ((void *)(unsigned long)((phys_addr_t)(x) + VIRT_PHYS_OFFSET))
198#define __pa(x) ((phys_addr_t)(unsigned long)(x) - VIRT_PHYS_OFFSET)
199#else
200#ifdef CONFIG_PPC64
201
202#define VIRTUAL_WARN_ON(x) WARN_ON(IS_ENABLED(CONFIG_DEBUG_VIRTUAL) && (x))
203
204/*
205 * gcc miscompiles (unsigned long)(&static_var) - PAGE_OFFSET
206 * with -mcmodel=medium, so we use & and | instead of - and + on 64-bit.
207 * This also results in better code generation.
208 */
209#define __va(x) \
210({ \
211 VIRTUAL_WARN_ON((unsigned long)(x) >= PAGE_OFFSET); \
212 (void *)(unsigned long)((phys_addr_t)(x) | PAGE_OFFSET); \
213})
214
215#define __pa(x) \
216({ \
217 VIRTUAL_WARN_ON((unsigned long)(x) < PAGE_OFFSET); \
218 (unsigned long)(x) & 0x0fffffffffffffffUL; \
219})
220
221#else /* 32-bit, non book E */
222#define __va(x) ((void *)(unsigned long)((phys_addr_t)(x) + PAGE_OFFSET - MEMORY_START))
223#define __pa(x) ((unsigned long)(x) - PAGE_OFFSET + MEMORY_START)
224#endif
225#endif
226
227#ifndef __ASSEMBLY__
228static inline unsigned long virt_to_pfn(const void *kaddr)
229{
230 return __pa(kaddr) >> PAGE_SHIFT;
231}
232
233static inline const void *pfn_to_kaddr(unsigned long pfn)
234{
235 return __va(pfn << PAGE_SHIFT);
236}
237#endif
238
239#define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr))
240#define virt_addr_valid(vaddr) ({ \
241 unsigned long _addr = (unsigned long)vaddr; \
242 _addr >= PAGE_OFFSET && _addr < (unsigned long)high_memory && \
243 pfn_valid(virt_to_pfn((void *)_addr)); \
244})
245
246/*
247 * Unfortunately the PLT is in the BSS in the PPC32 ELF ABI,
248 * and needs to be executable. This means the whole heap ends
249 * up being executable.
250 */
251#define VM_DATA_DEFAULT_FLAGS32 VM_DATA_FLAGS_TSK_EXEC
252#define VM_DATA_DEFAULT_FLAGS64 VM_DATA_FLAGS_NON_EXEC
253
254#ifdef __powerpc64__
255#include <asm/page_64.h>
256#else
257#include <asm/page_32.h>
258#endif
259
260/*
261 * Don't compare things with KERNELBASE or PAGE_OFFSET to test for
262 * "kernelness", use is_kernel_addr() - it should do what you want.
263 */
264#ifdef CONFIG_PPC_BOOK3E_64
265#define is_kernel_addr(x) ((x) >= 0x8000000000000000ul)
266#elif defined(CONFIG_PPC_BOOK3S_64)
267#define is_kernel_addr(x) ((x) >= PAGE_OFFSET)
268#else
269#define is_kernel_addr(x) ((x) >= TASK_SIZE)
270#endif
271
272#ifndef CONFIG_PPC_BOOK3S_64
273/*
274 * Use the top bit of the higher-level page table entries to indicate whether
275 * the entries we point to contain hugepages. This works because we know that
276 * the page tables live in kernel space. If we ever decide to support having
277 * page tables at arbitrary addresses, this breaks and will have to change.
278 */
279#ifdef CONFIG_PPC64
280#define PD_HUGE 0x8000000000000000UL
281#else
282#define PD_HUGE 0x80000000
283#endif
284
285#else /* CONFIG_PPC_BOOK3S_64 */
286/*
287 * Book3S 64 stores real addresses in the hugepd entries to
288 * avoid overlaps with _PAGE_PRESENT and _PAGE_PTE.
289 */
290#define HUGEPD_ADDR_MASK (0x0ffffffffffffffful & ~HUGEPD_SHIFT_MASK)
291#endif /* CONFIG_PPC_BOOK3S_64 */
292
293/*
294 * Some number of bits at the level of the page table that points to
295 * a hugepte are used to encode the size. This masks those bits.
296 * On 8xx, HW assistance requires 4k alignment for the hugepte.
297 */
298#ifdef CONFIG_PPC_8xx
299#define HUGEPD_SHIFT_MASK 0xfff
300#else
301#define HUGEPD_SHIFT_MASK 0x3f
302#endif
303
304#ifndef __ASSEMBLY__
305
306#ifdef CONFIG_PPC_BOOK3S_64
307#include <asm/pgtable-be-types.h>
308#else
309#include <asm/pgtable-types.h>
310#endif
311
312struct page;
313extern void clear_user_page(void *page, unsigned long vaddr, struct page *pg);
314extern void copy_user_page(void *to, void *from, unsigned long vaddr,
315 struct page *p);
316extern int devmem_is_allowed(unsigned long pfn);
317
318#ifdef CONFIG_PPC_SMLPAR
319void arch_free_page(struct page *page, int order);
320#define HAVE_ARCH_FREE_PAGE
321#endif
322
323struct vm_area_struct;
324
325extern unsigned long kernstart_virt_addr;
326
327static inline unsigned long kaslr_offset(void)
328{
329 return kernstart_virt_addr - KERNELBASE;
330}
331
332#include <asm-generic/memory_model.h>
333#endif /* __ASSEMBLY__ */
334
335#endif /* _ASM_POWERPC_PAGE_H */
1#ifndef _ASM_POWERPC_PAGE_H
2#define _ASM_POWERPC_PAGE_H
3
4/*
5 * Copyright (C) 2001,2005 IBM Corporation.
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
11 */
12
13#ifndef __ASSEMBLY__
14#include <linux/types.h>
15#include <linux/kernel.h>
16#else
17#include <asm/types.h>
18#endif
19#include <asm/asm-compat.h>
20#include <asm/kdump.h>
21
22/*
23 * On regular PPC32 page size is 4K (but we support 4K/16K/64K/256K pages
24 * on PPC44x). For PPC64 we support either 4K or 64K software
25 * page size. When using 64K pages however, whether we are really supporting
26 * 64K pages in HW or not is irrelevant to those definitions.
27 */
28#if defined(CONFIG_PPC_256K_PAGES)
29#define PAGE_SHIFT 18
30#elif defined(CONFIG_PPC_64K_PAGES)
31#define PAGE_SHIFT 16
32#elif defined(CONFIG_PPC_16K_PAGES)
33#define PAGE_SHIFT 14
34#else
35#define PAGE_SHIFT 12
36#endif
37
38#define PAGE_SIZE (ASM_CONST(1) << PAGE_SHIFT)
39
40#ifndef __ASSEMBLY__
41#ifdef CONFIG_HUGETLB_PAGE
42extern unsigned int HPAGE_SHIFT;
43#else
44#define HPAGE_SHIFT PAGE_SHIFT
45#endif
46#define HPAGE_SIZE ((1UL) << HPAGE_SHIFT)
47#define HPAGE_MASK (~(HPAGE_SIZE - 1))
48#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
49#define HUGE_MAX_HSTATE (MMU_PAGE_COUNT-1)
50#endif
51
52/*
53 * Subtle: (1 << PAGE_SHIFT) is an int, not an unsigned long. So if we
54 * assign PAGE_MASK to a larger type it gets extended the way we want
55 * (i.e. with 1s in the high bits)
56 */
57#define PAGE_MASK (~((1 << PAGE_SHIFT) - 1))
58
59/*
60 * KERNELBASE is the virtual address of the start of the kernel, it's often
61 * the same as PAGE_OFFSET, but _might not be_.
62 *
63 * The kdump dump kernel is one example where KERNELBASE != PAGE_OFFSET.
64 *
65 * PAGE_OFFSET is the virtual address of the start of lowmem.
66 *
67 * PHYSICAL_START is the physical address of the start of the kernel.
68 *
69 * MEMORY_START is the physical address of the start of lowmem.
70 *
71 * KERNELBASE, PAGE_OFFSET, and PHYSICAL_START are all configurable on
72 * ppc32 and based on how they are set we determine MEMORY_START.
73 *
74 * For the linear mapping the following equation should be true:
75 * KERNELBASE - PAGE_OFFSET = PHYSICAL_START - MEMORY_START
76 *
77 * Also, KERNELBASE >= PAGE_OFFSET and PHYSICAL_START >= MEMORY_START
78 *
79 * There are two ways to determine a physical address from a virtual one:
80 * va = pa + PAGE_OFFSET - MEMORY_START
81 * va = pa + KERNELBASE - PHYSICAL_START
82 *
83 * If you want to know something's offset from the start of the kernel you
84 * should subtract KERNELBASE.
85 *
86 * If you want to test if something's a kernel address, use is_kernel_addr().
87 */
88
89#define KERNELBASE ASM_CONST(CONFIG_KERNEL_START)
90#define PAGE_OFFSET ASM_CONST(CONFIG_PAGE_OFFSET)
91#define LOAD_OFFSET ASM_CONST((CONFIG_KERNEL_START-CONFIG_PHYSICAL_START))
92
93#if defined(CONFIG_NONSTATIC_KERNEL)
94#ifndef __ASSEMBLY__
95
96extern phys_addr_t memstart_addr;
97extern phys_addr_t kernstart_addr;
98
99#if defined(CONFIG_RELOCATABLE) && defined(CONFIG_PPC32)
100extern long long virt_phys_offset;
101#endif
102
103#endif /* __ASSEMBLY__ */
104#define PHYSICAL_START kernstart_addr
105
106#else /* !CONFIG_NONSTATIC_KERNEL */
107#define PHYSICAL_START ASM_CONST(CONFIG_PHYSICAL_START)
108#endif
109
110/* See Description below for VIRT_PHYS_OFFSET */
111#if defined(CONFIG_PPC32) && defined(CONFIG_BOOKE)
112#ifdef CONFIG_RELOCATABLE
113#define VIRT_PHYS_OFFSET virt_phys_offset
114#else
115#define VIRT_PHYS_OFFSET (KERNELBASE - PHYSICAL_START)
116#endif
117#endif
118
119#ifdef CONFIG_PPC64
120#define MEMORY_START 0UL
121#elif defined(CONFIG_NONSTATIC_KERNEL)
122#define MEMORY_START memstart_addr
123#else
124#define MEMORY_START (PHYSICAL_START + PAGE_OFFSET - KERNELBASE)
125#endif
126
127#ifdef CONFIG_FLATMEM
128#define ARCH_PFN_OFFSET ((unsigned long)(MEMORY_START >> PAGE_SHIFT))
129#define pfn_valid(pfn) ((pfn) >= ARCH_PFN_OFFSET && (pfn) < max_mapnr)
130#endif
131
132#define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT)
133#define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr))
134#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
135#define virt_addr_valid(kaddr) pfn_valid(virt_to_pfn(kaddr))
136
137/*
138 * On Book-E parts we need __va to parse the device tree and we can't
139 * determine MEMORY_START until then. However we can determine PHYSICAL_START
140 * from information at hand (program counter, TLB lookup).
141 *
142 * On BookE with RELOCATABLE && PPC32
143 *
144 * With RELOCATABLE && PPC32, we support loading the kernel at any physical
145 * address without any restriction on the page alignment.
146 *
147 * We find the runtime address of _stext and relocate ourselves based on
148 * the following calculation:
149 *
150 * virtual_base = ALIGN_DOWN(KERNELBASE,256M) +
151 * MODULO(_stext.run,256M)
152 * and create the following mapping:
153 *
154 * ALIGN_DOWN(_stext.run,256M) => ALIGN_DOWN(KERNELBASE,256M)
155 *
156 * When we process relocations, we cannot depend on the
157 * existing equation for the __va()/__pa() translations:
158 *
159 * __va(x) = (x) - PHYSICAL_START + KERNELBASE
160 *
161 * Where:
162 * PHYSICAL_START = kernstart_addr = Physical address of _stext
163 * KERNELBASE = Compiled virtual address of _stext.
164 *
165 * This formula holds true iff, kernel load address is TLB page aligned.
166 *
167 * In our case, we need to also account for the shift in the kernel Virtual
168 * address.
169 *
170 * E.g.,
171 *
172 * Let the kernel be loaded at 64MB and KERNELBASE be 0xc0000000 (same as PAGE_OFFSET).
173 * In this case, we would be mapping 0 to 0xc0000000, and kernstart_addr = 64M
174 *
175 * Now __va(1MB) = (0x100000) - (0x4000000) + 0xc0000000
176 * = 0xbc100000 , which is wrong.
177 *
178 * Rather, it should be : 0xc0000000 + 0x100000 = 0xc0100000
179 * according to our mapping.
180 *
181 * Hence we use the following formula to get the translations right:
182 *
183 * __va(x) = (x) - [ PHYSICAL_START - Effective KERNELBASE ]
184 *
185 * Where :
186 * PHYSICAL_START = dynamic load address.(kernstart_addr variable)
187 * Effective KERNELBASE = virtual_base =
188 * = ALIGN_DOWN(KERNELBASE,256M) +
189 * MODULO(PHYSICAL_START,256M)
190 *
191 * To make the cost of __va() / __pa() more light weight, we introduce
192 * a new variable virt_phys_offset, which will hold :
193 *
194 * virt_phys_offset = Effective KERNELBASE - PHYSICAL_START
195 * = ALIGN_DOWN(KERNELBASE,256M) -
196 * ALIGN_DOWN(PHYSICALSTART,256M)
197 *
198 * Hence :
199 *
200 * __va(x) = x - PHYSICAL_START + Effective KERNELBASE
201 * = x + virt_phys_offset
202 *
203 * and
204 * __pa(x) = x + PHYSICAL_START - Effective KERNELBASE
205 * = x - virt_phys_offset
206 *
207 * On non-Book-E PPC64 PAGE_OFFSET and MEMORY_START are constants so use
208 * the other definitions for __va & __pa.
209 */
210#if defined(CONFIG_PPC32) && defined(CONFIG_BOOKE)
211#define __va(x) ((void *)(unsigned long)((phys_addr_t)(x) + VIRT_PHYS_OFFSET))
212#define __pa(x) ((unsigned long)(x) - VIRT_PHYS_OFFSET)
213#else
214#ifdef CONFIG_PPC64
215/*
216 * gcc miscompiles (unsigned long)(&static_var) - PAGE_OFFSET
217 * with -mcmodel=medium, so we use & and | instead of - and + on 64-bit.
218 */
219#define __va(x) ((void *)(unsigned long)((phys_addr_t)(x) | PAGE_OFFSET))
220#define __pa(x) ((unsigned long)(x) & 0x0fffffffffffffffUL)
221
222#else /* 32-bit, non book E */
223#define __va(x) ((void *)(unsigned long)((phys_addr_t)(x) + PAGE_OFFSET - MEMORY_START))
224#define __pa(x) ((unsigned long)(x) - PAGE_OFFSET + MEMORY_START)
225#endif
226#endif
227
228/*
229 * Unfortunately the PLT is in the BSS in the PPC32 ELF ABI,
230 * and needs to be executable. This means the whole heap ends
231 * up being executable.
232 */
233#define VM_DATA_DEFAULT_FLAGS32 (VM_READ | VM_WRITE | VM_EXEC | \
234 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
235
236#define VM_DATA_DEFAULT_FLAGS64 (VM_READ | VM_WRITE | \
237 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
238
239#ifdef __powerpc64__
240#include <asm/page_64.h>
241#else
242#include <asm/page_32.h>
243#endif
244
245/* align addr on a size boundary - adjust address up/down if needed */
246#define _ALIGN_UP(addr, size) __ALIGN_KERNEL(addr, size)
247#define _ALIGN_DOWN(addr, size) ((addr)&(~((typeof(addr))(size)-1)))
248
249/* align addr on a size boundary - adjust address up if needed */
250#define _ALIGN(addr,size) _ALIGN_UP(addr,size)
251
252/*
253 * Don't compare things with KERNELBASE or PAGE_OFFSET to test for
254 * "kernelness", use is_kernel_addr() - it should do what you want.
255 */
256#ifdef CONFIG_PPC_BOOK3E_64
257#define is_kernel_addr(x) ((x) >= 0x8000000000000000ul)
258#else
259#define is_kernel_addr(x) ((x) >= PAGE_OFFSET)
260#endif
261
262#ifndef CONFIG_PPC_BOOK3S_64
263/*
264 * Use the top bit of the higher-level page table entries to indicate whether
265 * the entries we point to contain hugepages. This works because we know that
266 * the page tables live in kernel space. If we ever decide to support having
267 * page tables at arbitrary addresses, this breaks and will have to change.
268 */
269#ifdef CONFIG_PPC64
270#define PD_HUGE 0x8000000000000000
271#else
272#define PD_HUGE 0x80000000
273#endif
274
275#else /* CONFIG_PPC_BOOK3S_64 */
276/*
277 * Book3S 64 stores real addresses in the hugepd entries to
278 * avoid overlaps with _PAGE_PRESENT and _PAGE_PTE.
279 */
280#define HUGEPD_ADDR_MASK (0x0ffffffffffffffful & ~HUGEPD_SHIFT_MASK)
281#endif /* CONFIG_PPC_BOOK3S_64 */
282
283/*
284 * Some number of bits at the level of the page table that points to
285 * a hugepte are used to encode the size. This masks those bits.
286 */
287#define HUGEPD_SHIFT_MASK 0x3f
288
289#ifndef __ASSEMBLY__
290
291#ifdef CONFIG_PPC_BOOK3S_64
292#include <asm/pgtable-be-types.h>
293#else
294#include <asm/pgtable-types.h>
295#endif
296
297
298#ifndef CONFIG_HUGETLB_PAGE
299#define is_hugepd(pdep) (0)
300#define pgd_huge(pgd) (0)
301#endif /* CONFIG_HUGETLB_PAGE */
302
303struct page;
304extern void clear_user_page(void *page, unsigned long vaddr, struct page *pg);
305extern void copy_user_page(void *to, void *from, unsigned long vaddr,
306 struct page *p);
307extern int page_is_ram(unsigned long pfn);
308extern int devmem_is_allowed(unsigned long pfn);
309
310#ifdef CONFIG_PPC_SMLPAR
311void arch_free_page(struct page *page, int order);
312#define HAVE_ARCH_FREE_PAGE
313#endif
314
315struct vm_area_struct;
316#ifdef CONFIG_PPC_BOOK3S_64
317/*
318 * For BOOK3s 64 with 4k and 64K linux page size
319 * we want to use pointers, because the page table
320 * actually store pfn
321 */
322typedef pte_t *pgtable_t;
323#else
324#if defined(CONFIG_PPC_64K_PAGES) && defined(CONFIG_PPC64)
325typedef pte_t *pgtable_t;
326#else
327typedef struct page *pgtable_t;
328#endif
329#endif
330
331#include <asm-generic/memory_model.h>
332#endif /* __ASSEMBLY__ */
333
334#endif /* _ASM_POWERPC_PAGE_H */