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Michael Ellerman5cd16ee2005-11-11 14:25:24 +11001#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
Kumar Galaa3ba68f2008-10-20 03:16:55 +000013#ifndef __ASSEMBLY__
14#include <linux/types.h>
Stephen Rothwell463baa82008-10-16 20:29:07 +110015#else
16#include <asm/types.h>
Kumar Galaa3ba68f2008-10-20 03:16:55 +000017#endif
Michael Ellerman5cd16ee2005-11-11 14:25:24 +110018#include <asm/asm-compat.h>
Michael Ellerman47310412006-05-17 18:00:49 +100019#include <asm/kdump.h>
Michael Ellerman5cd16ee2005-11-11 14:25:24 +110020
21/*
Yuri Tikhonove1240122009-01-29 01:40:44 +000022 * On regular PPC32 page size is 4K (but we support 4K/16K/64K/256K pages
Ilya Yanokca9153a2008-12-11 04:55:41 +030023 * on PPC44x). For PPC64 we support either 4K or 64K software
Michael Ellerman5cd16ee2005-11-11 14:25:24 +110024 * page size. When using 64K pages however, whether we are really supporting
25 * 64K pages in HW or not is irrelevant to those definitions.
26 */
Yuri Tikhonove1240122009-01-29 01:40:44 +000027#if defined(CONFIG_PPC_256K_PAGES)
28#define PAGE_SHIFT 18
29#elif defined(CONFIG_PPC_64K_PAGES)
Michael Ellerman5cd16ee2005-11-11 14:25:24 +110030#define PAGE_SHIFT 16
Ilya Yanokca9153a2008-12-11 04:55:41 +030031#elif defined(CONFIG_PPC_16K_PAGES)
32#define PAGE_SHIFT 14
Michael Ellerman5cd16ee2005-11-11 14:25:24 +110033#else
34#define PAGE_SHIFT 12
35#endif
36
37#define PAGE_SIZE (ASM_CONST(1) << PAGE_SHIFT)
38
Becky Bruce41151e72011-06-28 09:54:48 +000039#ifndef __ASSEMBLY__
40#ifdef CONFIG_HUGETLB_PAGE
41extern unsigned int HPAGE_SHIFT;
42#else
43#define HPAGE_SHIFT PAGE_SHIFT
44#endif
45#define HPAGE_SIZE ((1UL) << HPAGE_SHIFT)
46#define HPAGE_MASK (~(HPAGE_SIZE - 1))
47#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
48#define HUGE_MAX_HSTATE (MMU_PAGE_COUNT-1)
49#endif
50
Michael Ellerman5cd16ee2005-11-11 14:25:24 +110051/* We do define AT_SYSINFO_EHDR but don't use the gate mechanism */
52#define __HAVE_ARCH_GATE_AREA 1
53
54/*
55 * Subtle: (1 << PAGE_SHIFT) is an int, not an unsigned long. So if we
56 * assign PAGE_MASK to a larger type it gets extended the way we want
57 * (i.e. with 1s in the high bits)
58 */
59#define PAGE_MASK (~((1 << PAGE_SHIFT) - 1))
60
Michael Ellermanb5666f72005-12-05 10:24:33 -060061/*
62 * KERNELBASE is the virtual address of the start of the kernel, it's often
63 * the same as PAGE_OFFSET, but _might not be_.
64 *
65 * The kdump dump kernel is one example where KERNELBASE != PAGE_OFFSET.
66 *
Kumar Gala37dd2ba2008-04-22 04:22:34 +100067 * PAGE_OFFSET is the virtual address of the start of lowmem.
68 *
69 * PHYSICAL_START is the physical address of the start of the kernel.
70 *
71 * MEMORY_START is the physical address of the start of lowmem.
72 *
73 * KERNELBASE, PAGE_OFFSET, and PHYSICAL_START are all configurable on
74 * ppc32 and based on how they are set we determine MEMORY_START.
75 *
76 * For the linear mapping the following equation should be true:
77 * KERNELBASE - PAGE_OFFSET = PHYSICAL_START - MEMORY_START
78 *
79 * Also, KERNELBASE >= PAGE_OFFSET and PHYSICAL_START >= MEMORY_START
80 *
81 * There are two was to determine a physical address from a virtual one:
82 * va = pa + PAGE_OFFSET - MEMORY_START
83 * va = pa + KERNELBASE - PHYSICAL_START
Michael Ellermanb5666f72005-12-05 10:24:33 -060084 *
85 * If you want to know something's offset from the start of the kernel you
86 * should subtract KERNELBASE.
87 *
88 * If you want to test if something's a kernel address, use is_kernel_addr().
89 */
Michael Ellerman398ab1f2005-12-04 18:39:23 +110090
Kumar Gala37dd2ba2008-04-22 04:22:34 +100091#define KERNELBASE ASM_CONST(CONFIG_KERNEL_START)
92#define PAGE_OFFSET ASM_CONST(CONFIG_PAGE_OFFSET)
93#define LOAD_OFFSET ASM_CONST((CONFIG_KERNEL_START-CONFIG_PHYSICAL_START))
94
Suzuki Poulose0f890c82011-12-14 22:57:15 +000095#if defined(CONFIG_NONSTATIC_KERNEL)
Kumar Gala37dd2ba2008-04-22 04:22:34 +100096#ifndef __ASSEMBLY__
Kumar Galaa3ba68f2008-10-20 03:16:55 +000097
Kumar Gala37dd2ba2008-04-22 04:22:34 +100098extern phys_addr_t memstart_addr;
99extern phys_addr_t kernstart_addr;
100#endif
101#define PHYSICAL_START kernstart_addr
Kumar Gala37dd2ba2008-04-22 04:22:34 +1000102#else
103#define PHYSICAL_START ASM_CONST(CONFIG_PHYSICAL_START)
Paul Mackerras549e8152008-08-30 11:43:47 +1000104#endif
105
106#ifdef CONFIG_PPC64
107#define MEMORY_START 0UL
Suzuki Poulose0f890c82011-12-14 22:57:15 +0000108#elif defined(CONFIG_NONSTATIC_KERNEL)
Paul Mackerras549e8152008-08-30 11:43:47 +1000109#define MEMORY_START memstart_addr
110#else
Kumar Gala37dd2ba2008-04-22 04:22:34 +1000111#define MEMORY_START (PHYSICAL_START + PAGE_OFFSET - KERNELBASE)
112#endif
Michael Ellerman5cd16ee2005-11-11 14:25:24 +1100113
Michael Ellerman5cd16ee2005-11-11 14:25:24 +1100114#ifdef CONFIG_FLATMEM
Scott Wood67eb5492011-03-24 11:51:19 +0000115#define ARCH_PFN_OFFSET ((unsigned long)(MEMORY_START >> PAGE_SHIFT))
Scott Wood81c386c2011-01-27 10:31:38 +0000116#define pfn_valid(pfn) ((pfn) >= ARCH_PFN_OFFSET && (pfn) < max_mapnr)
Michael Ellerman5cd16ee2005-11-11 14:25:24 +1100117#endif
118
119#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
120#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
121#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
122
Kumar Galadbc96322010-04-21 02:12:58 -0500123/*
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 non-Book-E PPC64 PAGE_OFFSET and MEMORY_START are constants so use
129 * the other definitions for __va & __pa.
130 */
131#ifdef CONFIG_BOOKE
132#define __va(x) ((void *)(unsigned long)((phys_addr_t)(x) - PHYSICAL_START + KERNELBASE))
133#define __pa(x) ((unsigned long)(x) + PHYSICAL_START - KERNELBASE)
134#else
135#define __va(x) ((void *)(unsigned long)((phys_addr_t)(x) + PAGE_OFFSET - MEMORY_START))
Paul Mackerras549e8152008-08-30 11:43:47 +1000136#define __pa(x) ((unsigned long)(x) - PAGE_OFFSET + MEMORY_START)
Kumar Galadbc96322010-04-21 02:12:58 -0500137#endif
Michael Ellerman5cd16ee2005-11-11 14:25:24 +1100138
139/*
140 * Unfortunately the PLT is in the BSS in the PPC32 ELF ABI,
141 * and needs to be executable. This means the whole heap ends
142 * up being executable.
143 */
144#define VM_DATA_DEFAULT_FLAGS32 (VM_READ | VM_WRITE | VM_EXEC | \
145 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
146
147#define VM_DATA_DEFAULT_FLAGS64 (VM_READ | VM_WRITE | \
148 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
149
150#ifdef __powerpc64__
151#include <asm/page_64.h>
152#else
153#include <asm/page_32.h>
154#endif
155
156/* align addr on a size boundary - adjust address up/down if needed */
157#define _ALIGN_UP(addr,size) (((addr)+((size)-1))&(~((size)-1)))
158#define _ALIGN_DOWN(addr,size) ((addr)&(~((size)-1)))
159
160/* align addr on a size boundary - adjust address up if needed */
161#define _ALIGN(addr,size) _ALIGN_UP(addr,size)
162
Michael Ellerman51fae6de2005-12-04 18:39:15 +1100163/*
164 * Don't compare things with KERNELBASE or PAGE_OFFSET to test for
165 * "kernelness", use is_kernel_addr() - it should do what you want.
166 */
Benjamin Herrenschmidt57e2a992009-07-28 11:59:34 +1000167#ifdef CONFIG_PPC_BOOK3E_64
168#define is_kernel_addr(x) ((x) >= 0x8000000000000000ul)
169#else
Michael Ellerman51fae6de2005-12-04 18:39:15 +1100170#define is_kernel_addr(x) ((x) >= PAGE_OFFSET)
Benjamin Herrenschmidt57e2a992009-07-28 11:59:34 +1000171#endif
Michael Ellerman51fae6de2005-12-04 18:39:15 +1100172
Becky Bruce41151e72011-06-28 09:54:48 +0000173/*
174 * Use the top bit of the higher-level page table entries to indicate whether
175 * the entries we point to contain hugepages. This works because we know that
176 * the page tables live in kernel space. If we ever decide to support having
177 * page tables at arbitrary addresses, this breaks and will have to change.
178 */
179#ifdef CONFIG_PPC64
180#define PD_HUGE 0x8000000000000000
181#else
182#define PD_HUGE 0x80000000
183#endif
184
185/*
186 * Some number of bits at the level of the page table that points to
187 * a hugepte are used to encode the size. This masks those bits.
188 */
189#define HUGEPD_SHIFT_MASK 0x3f
190
Michael Ellerman5cd16ee2005-11-11 14:25:24 +1100191#ifndef __ASSEMBLY__
192
193#undef STRICT_MM_TYPECHECKS
194
195#ifdef STRICT_MM_TYPECHECKS
196/* These are used to make use of C type-checking. */
197
198/* PTE level */
199typedef struct { pte_basic_t pte; } pte_t;
200#define pte_val(x) ((x).pte)
201#define __pte(x) ((pte_t) { (x) })
202
203/* 64k pages additionally define a bigger "real PTE" type that gathers
204 * the "second half" part of the PTE for pseudo 64k pages
205 */
Ilya Yanokca9153a2008-12-11 04:55:41 +0300206#if defined(CONFIG_PPC_64K_PAGES) && defined(CONFIG_PPC_STD_MMU_64)
Michael Ellerman5cd16ee2005-11-11 14:25:24 +1100207typedef struct { pte_t pte; unsigned long hidx; } real_pte_t;
208#else
209typedef struct { pte_t pte; } real_pte_t;
210#endif
211
212/* PMD level */
David Gibsond1953c82007-05-08 12:46:49 +1000213#ifdef CONFIG_PPC64
Michael Ellerman5cd16ee2005-11-11 14:25:24 +1100214typedef struct { unsigned long pmd; } pmd_t;
215#define pmd_val(x) ((x).pmd)
216#define __pmd(x) ((pmd_t) { (x) })
217
218/* PUD level exusts only on 4k pages */
David Gibsond1953c82007-05-08 12:46:49 +1000219#ifndef CONFIG_PPC_64K_PAGES
Michael Ellerman5cd16ee2005-11-11 14:25:24 +1100220typedef struct { unsigned long pud; } pud_t;
221#define pud_val(x) ((x).pud)
222#define __pud(x) ((pud_t) { (x) })
David Gibsond1953c82007-05-08 12:46:49 +1000223#endif /* !CONFIG_PPC_64K_PAGES */
224#endif /* CONFIG_PPC64 */
Michael Ellerman5cd16ee2005-11-11 14:25:24 +1100225
226/* PGD level */
227typedef struct { unsigned long pgd; } pgd_t;
228#define pgd_val(x) ((x).pgd)
229#define __pgd(x) ((pgd_t) { (x) })
230
231/* Page protection bits */
232typedef struct { unsigned long pgprot; } pgprot_t;
233#define pgprot_val(x) ((x).pgprot)
234#define __pgprot(x) ((pgprot_t) { (x) })
235
236#else
237
238/*
239 * .. while these make it easier on the compiler
240 */
241
242typedef pte_basic_t pte_t;
243#define pte_val(x) (x)
244#define __pte(x) (x)
245
Ilya Yanokca9153a2008-12-11 04:55:41 +0300246#if defined(CONFIG_PPC_64K_PAGES) && defined(CONFIG_PPC_STD_MMU_64)
Michael Ellerman5cd16ee2005-11-11 14:25:24 +1100247typedef struct { pte_t pte; unsigned long hidx; } real_pte_t;
248#else
Ilya Yanokca9153a2008-12-11 04:55:41 +0300249typedef pte_t real_pte_t;
Michael Ellerman5cd16ee2005-11-11 14:25:24 +1100250#endif
251
252
David Gibsond1953c82007-05-08 12:46:49 +1000253#ifdef CONFIG_PPC64
Michael Ellerman5cd16ee2005-11-11 14:25:24 +1100254typedef unsigned long pmd_t;
255#define pmd_val(x) (x)
256#define __pmd(x) (x)
257
David Gibsond1953c82007-05-08 12:46:49 +1000258#ifndef CONFIG_PPC_64K_PAGES
Michael Ellerman5cd16ee2005-11-11 14:25:24 +1100259typedef unsigned long pud_t;
260#define pud_val(x) (x)
261#define __pud(x) (x)
David Gibsond1953c82007-05-08 12:46:49 +1000262#endif /* !CONFIG_PPC_64K_PAGES */
263#endif /* CONFIG_PPC64 */
Michael Ellerman5cd16ee2005-11-11 14:25:24 +1100264
265typedef unsigned long pgd_t;
266#define pgd_val(x) (x)
267#define pgprot_val(x) (x)
268
269typedef unsigned long pgprot_t;
270#define __pgd(x) (x)
271#define __pgprot(x) (x)
272
273#endif
274
David Gibsona4fe3ce2009-10-26 19:24:31 +0000275typedef struct { signed long pd; } hugepd_t;
David Gibsona4fe3ce2009-10-26 19:24:31 +0000276
277#ifdef CONFIG_HUGETLB_PAGE
278static inline int hugepd_ok(hugepd_t hpd)
279{
280 return (hpd.pd > 0);
281}
282
283#define is_hugepd(pdep) (hugepd_ok(*((hugepd_t *)(pdep))))
284#else /* CONFIG_HUGETLB_PAGE */
285#define is_hugepd(pdep) 0
286#endif /* CONFIG_HUGETLB_PAGE */
287
Michael Ellerman5cd16ee2005-11-11 14:25:24 +1100288struct page;
289extern void clear_user_page(void *page, unsigned long vaddr, struct page *pg);
290extern void copy_user_page(void *to, void *from, unsigned long vaddr,
291 struct page *p);
292extern int page_is_ram(unsigned long pfn);
sukadev@linux.vnet.ibm.com1d54cf22011-08-30 09:19:17 +0000293extern int devmem_is_allowed(unsigned long pfn);
Michael Ellerman5cd16ee2005-11-11 14:25:24 +1100294
Robert Jennings14f966e2009-04-15 05:55:32 +0000295#ifdef CONFIG_PPC_SMLPAR
296void arch_free_page(struct page *page, int order);
297#define HAVE_ARCH_FREE_PAGE
298#endif
299
Benjamin Herrenschmidta5bba932006-05-30 13:51:37 +1000300struct vm_area_struct;
Benjamin Herrenschmidta5bba932006-05-30 13:51:37 +1000301
Martin Schwidefsky2f569af2008-02-08 04:22:04 -0800302typedef struct page *pgtable_t;
303
KAMEZAWA Hiroyuki659e3502006-03-27 01:15:35 -0800304#include <asm-generic/memory_model.h>
Michael Ellerman5cd16ee2005-11-11 14:25:24 +1100305#endif /* __ASSEMBLY__ */
306
Michael Ellerman5cd16ee2005-11-11 14:25:24 +1100307#endif /* _ASM_POWERPC_PAGE_H */