5 * Copyright (C) 2001 PPC64 Team, IBM Corp
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.
13 #include <linux/config.h>
15 /* PAGE_SHIFT determines the page size */
18 # define PAGE_SIZE (1UL << PAGE_SHIFT)
20 # define PAGE_SIZE (1 << PAGE_SHIFT)
22 #define PAGE_MASK (~(PAGE_SIZE-1))
23 #define PAGE_OFFSET_MASK (PAGE_SIZE-1)
26 #define SID_MASK 0xfffffffff
27 #define GET_ESID(x) (((x) >> SID_SHIFT) & SID_MASK)
29 #ifdef CONFIG_HUGETLB_PAGE
31 #define HPAGE_SHIFT 24
32 #define HPAGE_SIZE ((1UL) << HPAGE_SHIFT)
33 #define HPAGE_MASK (~(HPAGE_SIZE - 1))
34 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
36 /* For 64-bit processes the hugepage range is 1T-1.5T */
37 #define TASK_HPAGE_BASE (0x0000010000000000UL)
38 #define TASK_HPAGE_END (0x0000018000000000UL)
40 #define LOW_ESID_MASK(addr, len) (((1U << (GET_ESID(addr+len-1)+1)) \
41 - (1U << GET_ESID(addr))) & 0xffff)
43 #define ARCH_HAS_HUGEPAGE_ONLY_RANGE
44 #define ARCH_HAS_PREPARE_HUGEPAGE_RANGE
46 #define touches_hugepage_low_range(addr, len) \
47 (LOW_ESID_MASK((addr), (len)) & current->mm->context.htlb_segs)
48 #define touches_hugepage_high_range(addr, len) \
49 (((addr) > (TASK_HPAGE_BASE-(len))) && ((addr) < TASK_HPAGE_END))
51 #define __within_hugepage_low_range(addr, len, segmask) \
52 ((LOW_ESID_MASK((addr), (len)) | (segmask)) == (segmask))
53 #define within_hugepage_low_range(addr, len) \
54 __within_hugepage_low_range((addr), (len), \
55 current->mm->context.htlb_segs)
56 #define within_hugepage_high_range(addr, len) (((addr) >= TASK_HPAGE_BASE) \
57 && ((addr)+(len) <= TASK_HPAGE_END) && ((addr)+(len) >= (addr)))
59 #define is_hugepage_only_range(addr, len) \
60 (touches_hugepage_high_range((addr), (len)) || \
61 touches_hugepage_low_range((addr), (len)))
62 #define hugetlb_free_pgtables free_pgtables
63 #define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
65 #define in_hugepage_area(context, addr) \
66 ((cur_cpu_spec->cpu_features & CPU_FTR_16M_PAGE) && \
67 ( (((addr) >= TASK_HPAGE_BASE) && ((addr) < TASK_HPAGE_END)) || \
68 ( ((addr) < 0x100000000L) && \
69 ((1 << GET_ESID(addr)) & (context).htlb_segs) ) ) )
71 #else /* !CONFIG_HUGETLB_PAGE */
73 #define in_hugepage_area(mm, addr) 0
75 #endif /* !CONFIG_HUGETLB_PAGE */
77 /* align addr on a size boundary - adjust address up/down if needed */
78 #define _ALIGN_UP(addr,size) (((addr)+((size)-1))&(~((size)-1)))
79 #define _ALIGN_DOWN(addr,size) ((addr)&(~((size)-1)))
81 /* align addr on a size boundary - adjust address up if needed */
82 #define _ALIGN(addr,size) _ALIGN_UP(addr,size)
84 /* to align the pointer to the (next) double word boundary */
85 #define DOUBLEWORD_ALIGN(addr) _ALIGN(addr,sizeof(unsigned long))
87 /* to align the pointer to the (next) page boundary */
88 #define PAGE_ALIGN(addr) _ALIGN(addr, PAGE_SIZE)
94 #undef STRICT_MM_TYPECHECKS
96 #define REGION_SIZE 4UL
97 #define REGION_SHIFT 60UL
98 #define REGION_MASK (((1UL<<REGION_SIZE)-1UL)<<REGION_SHIFT)
99 #define REGION_STRIDE (1UL << REGION_SHIFT)
101 static __inline__ void clear_page(void *addr)
103 unsigned long lines, line_size;
105 line_size = systemcfg->dCacheL1LineSize;
106 lines = naca->dCacheL1LinesPerPage;
108 __asm__ __volatile__(
109 "mtctr %1 # clear_page\n\
114 : "r" (lines), "0" (addr), "r" (line_size)
118 extern void copy_page(void *to, void *from);
120 extern void clear_user_page(void *page, unsigned long vaddr, struct page *pg);
121 extern void copy_user_page(void *to, void *from, unsigned long vaddr, struct page *p);
123 #ifdef STRICT_MM_TYPECHECKS
125 * These are used to make use of C type-checking.
126 * Entries in the pte table are 64b, while entries in the pgd & pmd are 32b.
128 typedef struct { unsigned long pte; } pte_t;
129 typedef struct { unsigned int pmd; } pmd_t;
130 typedef struct { unsigned int pgd; } pgd_t;
131 typedef struct { unsigned long pgprot; } pgprot_t;
133 #define pte_val(x) ((x).pte)
134 #define pmd_val(x) ((x).pmd)
135 #define pgd_val(x) ((x).pgd)
136 #define pgprot_val(x) ((x).pgprot)
138 #define __pte(x) ((pte_t) { (x) } )
139 #define __pmd(x) ((pmd_t) { (x) } )
140 #define __pgd(x) ((pgd_t) { (x) } )
141 #define __pgprot(x) ((pgprot_t) { (x) } )
145 * .. while these make it easier on the compiler
147 typedef unsigned long pte_t;
148 typedef unsigned int pmd_t;
149 typedef unsigned int pgd_t;
150 typedef unsigned long pgprot_t;
152 #define pte_val(x) (x)
153 #define pmd_val(x) (x)
154 #define pgd_val(x) (x)
155 #define pgprot_val(x) (x)
160 #define __pgprot(x) (x)
164 /* Pure 2^n version of get_order */
165 static inline int get_order(unsigned long size)
169 size = (size-1) >> (PAGE_SHIFT-1);
178 #define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
180 /* Not 100% correct, for use by /dev/mem only */
181 extern int page_is_ram(unsigned long physaddr);
183 #endif /* __ASSEMBLY__ */
186 #define __page_aligned __attribute__((__aligned__(PAGE_SIZE)))
188 #define __page_aligned \
189 __attribute__((__aligned__(PAGE_SIZE), \
190 __section__(".data.page_aligned")))
194 /* This must match the -Ttext linker address */
195 /* Note: tophys & tovirt make assumptions about how */
196 /* KERNELBASE is defined for performance reasons. */
197 /* When KERNELBASE moves, those macros may have */
199 #define PAGE_OFFSET 0xC000000000000000
200 #define KERNELBASE PAGE_OFFSET
201 #define VMALLOCBASE 0xD000000000000000
202 #define IOREGIONBASE 0xE000000000000000
203 #define EEHREGIONBASE 0xA000000000000000
205 #define IO_REGION_ID (IOREGIONBASE>>REGION_SHIFT)
206 #define EEH_REGION_ID (EEHREGIONBASE>>REGION_SHIFT)
207 #define VMALLOC_REGION_ID (VMALLOCBASE>>REGION_SHIFT)
208 #define KERNEL_REGION_ID (KERNELBASE>>REGION_SHIFT)
209 #define USER_REGION_ID (0UL)
210 #define REGION_ID(X) (((unsigned long)(X))>>REGION_SHIFT)
213 * Define valid/invalid EA bits (for all ranges)
215 #define VALID_EA_BITS (0x000001ffffffffffUL)
216 #define INVALID_EA_BITS (~(REGION_MASK|VALID_EA_BITS))
218 #define IS_VALID_REGION_ID(x) \
219 (((x) == USER_REGION_ID) || ((x) >= KERNEL_REGION_ID))
220 #define IS_VALID_EA(x) \
221 ((!((x) & INVALID_EA_BITS)) && IS_VALID_REGION_ID(REGION_ID(x)))
223 #define __bpn_to_ba(x) ((((unsigned long)(x))<<PAGE_SHIFT) + KERNELBASE)
224 #define __ba_to_bpn(x) ((((unsigned long)(x)) & ~REGION_MASK) >> PAGE_SHIFT)
226 #define __va(x) ((void *)((unsigned long)(x) + KERNELBASE))
228 #ifdef CONFIG_DISCONTIGMEM
229 #define page_to_pfn(page) discontigmem_page_to_pfn(page)
230 #define pfn_to_page(pfn) discontigmem_pfn_to_page(pfn)
231 #define pfn_valid(pfn) discontigmem_pfn_valid(pfn)
233 #define pfn_to_page(pfn) (mem_map + (pfn))
234 #define page_to_pfn(page) ((unsigned long)((page) - mem_map))
235 #define pfn_valid(pfn) ((pfn) < max_mapnr)
238 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
240 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
242 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
243 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
245 #endif /* __KERNEL__ */
246 #endif /* _PPC64_PAGE_H */