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Linux/arch/ia64/include/asm/page.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef _ASM_IA64_PAGE_H
  3 #define _ASM_IA64_PAGE_H
  4 /*
  5  * Pagetable related stuff.
  6  *
  7  * Copyright (C) 1998, 1999, 2002 Hewlett-Packard Co
  8  *      David Mosberger-Tang <davidm@hpl.hp.com>
  9  */
 10 
 11 #include <asm/intrinsics.h>
 12 #include <asm/types.h>
 13 
 14 /*
 15  * The top three bits of an IA64 address are its Region Number.
 16  * Different regions are assigned to different purposes.
 17  */
 18 #define RGN_SHIFT       (61)
 19 #define RGN_BASE(r)     (__IA64_UL_CONST(r)<<RGN_SHIFT)
 20 #define RGN_BITS        (RGN_BASE(-1))
 21 
 22 #define RGN_KERNEL      7       /* Identity mapped region */
 23 #define RGN_UNCACHED    6       /* Identity mapped I/O region */
 24 #define RGN_GATE        5       /* Gate page, Kernel text, etc */
 25 #define RGN_HPAGE       4       /* For Huge TLB pages */
 26 
 27 /*
 28  * PAGE_SHIFT determines the actual kernel page size.
 29  */
 30 #if defined(CONFIG_IA64_PAGE_SIZE_4KB)
 31 # define PAGE_SHIFT     12
 32 #elif defined(CONFIG_IA64_PAGE_SIZE_8KB)
 33 # define PAGE_SHIFT     13
 34 #elif defined(CONFIG_IA64_PAGE_SIZE_16KB)
 35 # define PAGE_SHIFT     14
 36 #elif defined(CONFIG_IA64_PAGE_SIZE_64KB)
 37 # define PAGE_SHIFT     16
 38 #else
 39 # error Unsupported page size!
 40 #endif
 41 
 42 #define PAGE_SIZE               (__IA64_UL_CONST(1) << PAGE_SHIFT)
 43 #define PAGE_MASK               (~(PAGE_SIZE - 1))
 44 
 45 #define PERCPU_PAGE_SHIFT       18      /* log2() of max. size of per-CPU area */
 46 #define PERCPU_PAGE_SIZE        (__IA64_UL_CONST(1) << PERCPU_PAGE_SHIFT)
 47 
 48 
 49 #ifdef CONFIG_HUGETLB_PAGE
 50 # define HPAGE_REGION_BASE      RGN_BASE(RGN_HPAGE)
 51 # define HPAGE_SHIFT            hpage_shift
 52 # define HPAGE_SHIFT_DEFAULT    28      /* check ia64 SDM for architecture supported size */
 53 # define HPAGE_SIZE             (__IA64_UL_CONST(1) << HPAGE_SHIFT)
 54 # define HPAGE_MASK             (~(HPAGE_SIZE - 1))
 55 
 56 # define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
 57 #endif /* CONFIG_HUGETLB_PAGE */
 58 
 59 #ifdef __ASSEMBLY__
 60 # define __pa(x)                ((x) - PAGE_OFFSET)
 61 # define __va(x)                ((x) + PAGE_OFFSET)
 62 #else /* !__ASSEMBLY */
 63 #  define STRICT_MM_TYPECHECKS
 64 
 65 extern void clear_page (void *page);
 66 extern void copy_page (void *to, void *from);
 67 
 68 /*
 69  * clear_user_page() and copy_user_page() can't be inline functions because
 70  * flush_dcache_page() can't be defined until later...
 71  */
 72 #define clear_user_page(addr, vaddr, page)      \
 73 do {                                            \
 74         clear_page(addr);                       \
 75         flush_dcache_page(page);                \
 76 } while (0)
 77 
 78 #define copy_user_page(to, from, vaddr, page)   \
 79 do {                                            \
 80         copy_page((to), (from));                \
 81         flush_dcache_page(page);                \
 82 } while (0)
 83 
 84 
 85 #define __alloc_zeroed_user_highpage(movableflags, vma, vaddr)          \
 86 ({                                                                      \
 87         struct page *page = alloc_page_vma(                             \
 88                 GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr);  \
 89         if (page)                                                       \
 90                 flush_dcache_page(page);                                \
 91         page;                                                           \
 92 })
 93 
 94 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
 95 
 96 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 97 
 98 #ifdef CONFIG_VIRTUAL_MEM_MAP
 99 extern int ia64_pfn_valid (unsigned long pfn);
100 #else
101 # define ia64_pfn_valid(pfn) 1
102 #endif
103 
104 #ifdef CONFIG_VIRTUAL_MEM_MAP
105 extern struct page *vmem_map;
106 #ifdef CONFIG_DISCONTIGMEM
107 # define page_to_pfn(page)      ((unsigned long) (page - vmem_map))
108 # define pfn_to_page(pfn)       (vmem_map + (pfn))
109 # define __pfn_to_phys(pfn)     PFN_PHYS(pfn)
110 #else
111 # include <asm-generic/memory_model.h>
112 #endif
113 #else
114 # include <asm-generic/memory_model.h>
115 #endif
116 
117 #ifdef CONFIG_FLATMEM
118 # define pfn_valid(pfn)         (((pfn) < max_mapnr) && ia64_pfn_valid(pfn))
119 #elif defined(CONFIG_DISCONTIGMEM)
120 extern unsigned long min_low_pfn;
121 extern unsigned long max_low_pfn;
122 # define pfn_valid(pfn)         (((pfn) >= min_low_pfn) && ((pfn) < max_low_pfn) && ia64_pfn_valid(pfn))
123 #endif
124 
125 #define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
126 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
127 #define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
128 
129 typedef union ia64_va {
130         struct {
131                 unsigned long off : 61;         /* intra-region offset */
132                 unsigned long reg :  3;         /* region number */
133         } f;
134         unsigned long l;
135         void *p;
136 } ia64_va;
137 
138 /*
139  * Note: These macros depend on the fact that PAGE_OFFSET has all
140  * region bits set to 1 and all other bits set to zero.  They are
141  * expressed in this way to ensure they result in a single "dep"
142  * instruction.
143  */
144 #define __pa(x)         ({ia64_va _v; _v.l = (long) (x); _v.f.reg = 0; _v.l;})
145 #define __va(x)         ({ia64_va _v; _v.l = (long) (x); _v.f.reg = -1; _v.p;})
146 
147 #define REGION_NUMBER(x)        ({ia64_va _v; _v.l = (long) (x); _v.f.reg;})
148 #define REGION_OFFSET(x)        ({ia64_va _v; _v.l = (long) (x); _v.f.off;})
149 
150 #ifdef CONFIG_HUGETLB_PAGE
151 # define htlbpage_to_page(x)    (((unsigned long) REGION_NUMBER(x) << 61)                       \
152                                  | (REGION_OFFSET(x) >> (HPAGE_SHIFT-PAGE_SHIFT)))
153 # define HUGETLB_PAGE_ORDER     (HPAGE_SHIFT - PAGE_SHIFT)
154 extern unsigned int hpage_shift;
155 #endif
156 
157 static __inline__ int
158 get_order (unsigned long size)
159 {
160         long double d = size - 1;
161         long order;
162 
163         order = ia64_getf_exp(d);
164         order = order - PAGE_SHIFT - 0xffff + 1;
165         if (order < 0)
166                 order = 0;
167         return order;
168 }
169 
170 #endif /* !__ASSEMBLY__ */
171 
172 #ifdef STRICT_MM_TYPECHECKS
173   /*
174    * These are used to make use of C type-checking..
175    */
176   typedef struct { unsigned long pte; } pte_t;
177   typedef struct { unsigned long pmd; } pmd_t;
178 #if CONFIG_PGTABLE_LEVELS == 4
179   typedef struct { unsigned long pud; } pud_t;
180 #endif
181   typedef struct { unsigned long pgd; } pgd_t;
182   typedef struct { unsigned long pgprot; } pgprot_t;
183   typedef struct page *pgtable_t;
184 
185 # define pte_val(x)     ((x).pte)
186 # define pmd_val(x)     ((x).pmd)
187 #if CONFIG_PGTABLE_LEVELS == 4
188 # define pud_val(x)     ((x).pud)
189 #endif
190 # define pgd_val(x)     ((x).pgd)
191 # define pgprot_val(x)  ((x).pgprot)
192 
193 # define __pte(x)       ((pte_t) { (x) } )
194 # define __pmd(x)       ((pmd_t) { (x) } )
195 # define __pgprot(x)    ((pgprot_t) { (x) } )
196 
197 #else /* !STRICT_MM_TYPECHECKS */
198   /*
199    * .. while these make it easier on the compiler
200    */
201 # ifndef __ASSEMBLY__
202     typedef unsigned long pte_t;
203     typedef unsigned long pmd_t;
204     typedef unsigned long pgd_t;
205     typedef unsigned long pgprot_t;
206     typedef struct page *pgtable_t;
207 # endif
208 
209 # define pte_val(x)     (x)
210 # define pmd_val(x)     (x)
211 # define pgd_val(x)     (x)
212 # define pgprot_val(x)  (x)
213 
214 # define __pte(x)       (x)
215 # define __pgd(x)       (x)
216 # define __pgprot(x)    (x)
217 #endif /* !STRICT_MM_TYPECHECKS */
218 
219 #define PAGE_OFFSET                     RGN_BASE(RGN_KERNEL)
220 
221 #define VM_DATA_DEFAULT_FLAGS           (VM_READ | VM_WRITE |                                   \
222                                          VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC |                \
223                                          (((current->personality & READ_IMPLIES_EXEC) != 0)     \
224                                           ? VM_EXEC : 0))
225 
226 #define GATE_ADDR               RGN_BASE(RGN_GATE)
227 
228 /*
229  * 0xa000000000000000+2*PERCPU_PAGE_SIZE
230  * - 0xa000000000000000+3*PERCPU_PAGE_SIZE remain unmapped (guard page)
231  */
232 #define KERNEL_START             (GATE_ADDR+__IA64_UL_CONST(0x100000000))
233 #define PERCPU_ADDR             (-PERCPU_PAGE_SIZE)
234 #define LOAD_OFFSET             (KERNEL_START - KERNEL_TR_PAGE_SIZE)
235 
236 #define __HAVE_ARCH_GATE_AREA   1
237 
238 #endif /* _ASM_IA64_PAGE_H */
239 

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