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

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  1 /*
  2  * Page management definitions for the Hexagon architecture
  3  *
  4  * Copyright (c) 2010-2013, The Linux Foundation. All rights reserved.
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License version 2 and
  8  * only version 2 as published by the Free Software Foundation.
  9  *
 10  * This program is distributed in the hope that it will be useful,
 11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 13  * GNU General Public License for more details.
 14  *
 15  * You should have received a copy of the GNU General Public License
 16  * along with this program; if not, write to the Free Software
 17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 18  * 02110-1301, USA.
 19  */
 20 
 21 #ifndef _ASM_PAGE_H
 22 #define _ASM_PAGE_H
 23 
 24 #include <linux/const.h>
 25 
 26 /*  This is probably not the most graceful way to handle this.  */
 27 
 28 #ifdef CONFIG_PAGE_SIZE_4KB
 29 #define PAGE_SHIFT 12
 30 #define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_4KB
 31 #endif
 32 
 33 #ifdef CONFIG_PAGE_SIZE_16KB
 34 #define PAGE_SHIFT 14
 35 #define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_16KB
 36 #endif
 37 
 38 #ifdef CONFIG_PAGE_SIZE_64KB
 39 #define PAGE_SHIFT 16
 40 #define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_64KB
 41 #endif
 42 
 43 #ifdef CONFIG_PAGE_SIZE_256KB
 44 #define PAGE_SHIFT 18
 45 #define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_256KB
 46 #endif
 47 
 48 #ifdef CONFIG_PAGE_SIZE_1MB
 49 #define PAGE_SHIFT 20
 50 #define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_1MB
 51 #endif
 52 
 53 /*
 54  *  These should be defined in hugetlb.h, but apparently not.
 55  *  "Huge" for us should be 4MB or 16MB, which are both represented
 56  *  in L1 PTE's.  Right now, it's set up for 4MB.
 57  */
 58 #ifdef CONFIG_HUGETLB_PAGE
 59 #define HPAGE_SHIFT 22
 60 #define HPAGE_SIZE (1UL << HPAGE_SHIFT)
 61 #define HPAGE_MASK (~(HPAGE_SIZE-1))
 62 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT-PAGE_SHIFT)
 63 #define HVM_HUGEPAGE_SIZE 0x5
 64 #endif
 65 
 66 #define PAGE_SIZE  (1UL << PAGE_SHIFT)
 67 #define PAGE_MASK  (~((1 << PAGE_SHIFT) - 1))
 68 
 69 #ifdef __KERNEL__
 70 #ifndef __ASSEMBLY__
 71 
 72 /*
 73  * This is for PFN_DOWN, which mm.h needs.  Seems the right place to pull it in.
 74  */
 75 #include <linux/pfn.h>
 76 
 77 /*
 78  * We implement a two-level architecture-specific page table structure.
 79  * Null intermediate page table level (pmd, pud) definitions will come from
 80  * asm-generic/pagetable-nopmd.h and asm-generic/pagetable-nopud.h
 81  */
 82 typedef struct { unsigned long pte; } pte_t;
 83 typedef struct { unsigned long pgd; } pgd_t;
 84 typedef struct { unsigned long pgprot; } pgprot_t;
 85 typedef struct page *pgtable_t;
 86 
 87 #define pte_val(x)     ((x).pte)
 88 #define pgd_val(x)     ((x).pgd)
 89 #define pgprot_val(x)  ((x).pgprot)
 90 #define __pte(x)       ((pte_t) { (x) })
 91 #define __pgd(x)       ((pgd_t) { (x) })
 92 #define __pgprot(x)    ((pgprot_t) { (x) })
 93 
 94 /*
 95  * We need a __pa and a __va routine for kernel space.
 96  * MIPS says they're only used during mem_init.
 97  * also, check if we need a PHYS_OFFSET.
 98  */
 99 #define __pa(x) ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET)
100 #define __va(x) ((void *)((unsigned long)(x) - PHYS_OFFSET + PAGE_OFFSET))
101 
102 /* The "page frame" descriptor is defined in linux/mm.h */
103 struct page;
104 
105 /* Returns page frame descriptor for virtual address. */
106 #define virt_to_page(kaddr) pfn_to_page(PFN_DOWN(__pa(kaddr)))
107 
108 /* Default vm area behavior is non-executable.  */
109 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \
110                                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
111 
112 #define pfn_valid(pfn) ((pfn) < max_mapnr)
113 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
114 
115 /*  Need to not use a define for linesize; may move this to another file.  */
116 static inline void clear_page(void *page)
117 {
118         /*  This can only be done on pages with L1 WB cache */
119         asm volatile(
120                 "       loop0(1f,%1);\n"
121                 "1:     { dczeroa(%0);\n"
122                 "         %0 = add(%0,#32); }:endloop0\n"
123                 : "+r" (page)
124                 : "r" (PAGE_SIZE/32)
125                 : "lc0", "sa0", "memory"
126         );
127 }
128 
129 #define copy_page(to, from)     memcpy((to), (from), PAGE_SIZE)
130 
131 /*
132  * Under assumption that kernel always "sees" user map...
133  */
134 #define clear_user_page(page, vaddr, pg)        clear_page(page)
135 #define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
136 
137 /*
138  * page_to_phys - convert page to physical address
139  * @page - pointer to page entry in mem_map
140  */
141 #define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
142 
143 #define virt_to_pfn(kaddr)      (__pa(kaddr) >> PAGE_SHIFT)
144 #define pfn_to_virt(pfn)        __va((pfn) << PAGE_SHIFT)
145 
146 #define page_to_virt(page)      __va(page_to_phys(page))
147 
148 /*
149  * For port to Hexagon Virtual Machine, MAYBE we check for attempts
150  * to reference reserved HVM space, but in any case, the VM will be
151  * protected.
152  */
153 #define kern_addr_valid(addr)   (1)
154 
155 #include <asm/mem-layout.h>
156 #include <asm-generic/memory_model.h>
157 /* XXX Todo: implement assembly-optimized version of getorder. */
158 #include <asm-generic/getorder.h>
159 
160 #endif /* ifdef __ASSEMBLY__ */
161 #endif /* ifdef __KERNEL__ */
162 
163 #endif
164 

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