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a7e79840 RK |
1 | /* |
2 | * Page management definitions for the Hexagon architecture | |
3 | * | |
7c6a5df4 | 4 | * Copyright (c) 2010-2013, The Linux Foundation. All rights reserved. |
a7e79840 RK |
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 | */ | |
8f5a0b9d RK |
99 | #define __pa(x) ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET) |
100 | #define __va(x) ((void *)((unsigned long)(x) - PHYS_OFFSET + PAGE_OFFSET)) | |
a7e79840 RK |
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 | ||
5e115054 RK |
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 | ||
a7e79840 RK |
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 | ||
8f5a0b9d | 155 | #include <asm/mem-layout.h> |
a7e79840 RK |
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 |