1 #ifndef _ASM_POWERPC_PAGE_H
2 #define _ASM_POWERPC_PAGE_H
5 * Copyright (C) 2001,2005 IBM Corporation.
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.
14 #include <linux/config.h>
15 #include <asm/asm-compat.h>
16 #include <asm/kdump.h>
19 * On PPC32 page size is 4K. For PPC64 we support either 4K or 64K software
20 * page size. When using 64K pages however, whether we are really supporting
21 * 64K pages in HW or not is irrelevant to those definitions.
23 #ifdef CONFIG_PPC_64K_PAGES
29 #define PAGE_SIZE (ASM_CONST(1) << PAGE_SHIFT)
31 /* We do define AT_SYSINFO_EHDR but don't use the gate mechanism */
32 #define __HAVE_ARCH_GATE_AREA 1
35 * Subtle: (1 << PAGE_SHIFT) is an int, not an unsigned long. So if we
36 * assign PAGE_MASK to a larger type it gets extended the way we want
37 * (i.e. with 1s in the high bits)
39 #define PAGE_MASK (~((1 << PAGE_SHIFT) - 1))
42 * KERNELBASE is the virtual address of the start of the kernel, it's often
43 * the same as PAGE_OFFSET, but _might not be_.
45 * The kdump dump kernel is one example where KERNELBASE != PAGE_OFFSET.
47 * To get a physical address from a virtual one you subtract PAGE_OFFSET,
50 * If you want to know something's offset from the start of the kernel you
51 * should subtract KERNELBASE.
53 * If you want to test if something's a kernel address, use is_kernel_addr().
56 #define PAGE_OFFSET ASM_CONST(CONFIG_KERNEL_START)
57 #define KERNELBASE (PAGE_OFFSET + PHYSICAL_START)
59 #ifdef CONFIG_DISCONTIGMEM
60 #define page_to_pfn(page) discontigmem_page_to_pfn(page)
61 #define pfn_to_page(pfn) discontigmem_pfn_to_page(pfn)
62 #define pfn_valid(pfn) discontigmem_pfn_valid(pfn)
66 #define pfn_valid(pfn) ((pfn) < max_mapnr)
69 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
70 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
71 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
73 #define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET))
74 #define __pa(x) ((unsigned long)(x) - PAGE_OFFSET)
77 * Unfortunately the PLT is in the BSS in the PPC32 ELF ABI,
78 * and needs to be executable. This means the whole heap ends
79 * up being executable.
81 #define VM_DATA_DEFAULT_FLAGS32 (VM_READ | VM_WRITE | VM_EXEC | \
82 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
84 #define VM_DATA_DEFAULT_FLAGS64 (VM_READ | VM_WRITE | \
85 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
88 #include <asm/page_64.h>
90 #include <asm/page_32.h>
93 /* align addr on a size boundary - adjust address up/down if needed */
94 #define _ALIGN_UP(addr,size) (((addr)+((size)-1))&(~((size)-1)))
95 #define _ALIGN_DOWN(addr,size) ((addr)&(~((size)-1)))
97 /* align addr on a size boundary - adjust address up if needed */
98 #define _ALIGN(addr,size) _ALIGN_UP(addr,size)
100 /* to align the pointer to the (next) page boundary */
101 #define PAGE_ALIGN(addr) _ALIGN(addr, PAGE_SIZE)
104 * Don't compare things with KERNELBASE or PAGE_OFFSET to test for
105 * "kernelness", use is_kernel_addr() - it should do what you want.
107 #define is_kernel_addr(x) ((x) >= PAGE_OFFSET)
111 #undef STRICT_MM_TYPECHECKS
113 #ifdef STRICT_MM_TYPECHECKS
114 /* These are used to make use of C type-checking. */
117 typedef struct { pte_basic_t pte; } pte_t;
118 #define pte_val(x) ((x).pte)
119 #define __pte(x) ((pte_t) { (x) })
121 /* 64k pages additionally define a bigger "real PTE" type that gathers
122 * the "second half" part of the PTE for pseudo 64k pages
124 #ifdef CONFIG_PPC_64K_PAGES
125 typedef struct { pte_t pte; unsigned long hidx; } real_pte_t;
127 typedef struct { pte_t pte; } real_pte_t;
131 typedef struct { unsigned long pmd; } pmd_t;
132 #define pmd_val(x) ((x).pmd)
133 #define __pmd(x) ((pmd_t) { (x) })
135 /* PUD level exusts only on 4k pages */
136 #ifndef CONFIG_PPC_64K_PAGES
137 typedef struct { unsigned long pud; } pud_t;
138 #define pud_val(x) ((x).pud)
139 #define __pud(x) ((pud_t) { (x) })
143 typedef struct { unsigned long pgd; } pgd_t;
144 #define pgd_val(x) ((x).pgd)
145 #define __pgd(x) ((pgd_t) { (x) })
147 /* Page protection bits */
148 typedef struct { unsigned long pgprot; } pgprot_t;
149 #define pgprot_val(x) ((x).pgprot)
150 #define __pgprot(x) ((pgprot_t) { (x) })
155 * .. while these make it easier on the compiler
158 typedef pte_basic_t pte_t;
159 #define pte_val(x) (x)
162 #ifdef CONFIG_PPC_64K_PAGES
163 typedef struct { pte_t pte; unsigned long hidx; } real_pte_t;
165 typedef unsigned long real_pte_t;
169 typedef unsigned long pmd_t;
170 #define pmd_val(x) (x)
173 #if defined(CONFIG_PPC64) && !defined(CONFIG_PPC_64K_PAGES)
174 typedef unsigned long pud_t;
175 #define pud_val(x) (x)
179 typedef unsigned long pgd_t;
180 #define pgd_val(x) (x)
181 #define pgprot_val(x) (x)
183 typedef unsigned long pgprot_t;
185 #define __pgprot(x) (x)
190 extern void clear_user_page(void *page, unsigned long vaddr, struct page *pg);
191 extern void copy_user_page(void *to, void *from, unsigned long vaddr,
193 extern int page_is_ram(unsigned long pfn);
195 struct vm_area_struct;
196 extern const char *arch_vma_name(struct vm_area_struct *vma);
198 #include <asm-generic/memory_model.h>
199 #endif /* __ASSEMBLY__ */
201 #endif /* __KERNEL__ */
203 #endif /* _ASM_POWERPC_PAGE_H */