1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Page management definitions for the Hexagon architecture
4 *
5 * Copyright (c) 2010-2013, The Linux Foundation. All rights reserved.
6 */
7
8 #ifndef _ASM_PAGE_H
9 #define _ASM_PAGE_H
10
11 #include <linux/const.h>
12
13 /* This is probably not the most graceful way to handle this. */
14
15 #ifdef CONFIG_PAGE_SIZE_4KB
16 #define PAGE_SHIFT 12
17 #define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_4KB
18 #endif
19
20 #ifdef CONFIG_PAGE_SIZE_16KB
21 #define PAGE_SHIFT 14
22 #define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_16KB
23 #endif
24
25 #ifdef CONFIG_PAGE_SIZE_64KB
26 #define PAGE_SHIFT 16
27 #define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_64KB
28 #endif
29
30 #ifdef CONFIG_PAGE_SIZE_256KB
31 #define PAGE_SHIFT 18
32 #define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_256KB
33 #endif
34
35 #ifdef CONFIG_PAGE_SIZE_1MB
36 #define PAGE_SHIFT 20
37 #define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_1MB
38 #endif
39
40 /*
41 * These should be defined in hugetlb.h, but apparently not.
42 * "Huge" for us should be 4MB or 16MB, which are both represented
43 * in L1 PTE's. Right now, it's set up for 4MB.
44 */
45 #ifdef CONFIG_HUGETLB_PAGE
46 #define HPAGE_SHIFT 22
47 #define HPAGE_SIZE (1UL << HPAGE_SHIFT)
48 #define HPAGE_MASK (~(HPAGE_SIZE-1))
49 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT-PAGE_SHIFT)
50 #define HVM_HUGEPAGE_SIZE 0x5
51 #endif
52
53 #define PAGE_SIZE (1UL << PAGE_SHIFT)
54 #define PAGE_MASK (~((1 << PAGE_SHIFT) - 1))
55
56 #ifdef __KERNEL__
57 #ifndef __ASSEMBLY__
58
59 /*
60 * This is for PFN_DOWN, which mm.h needs. Seems the right place to pull it in.
61 */
62 #include <linux/pfn.h>
63
64 /*
65 * We implement a two-level architecture-specific page table structure.
66 * Null intermediate page table level (pmd, pud) definitions will come from
67 * asm-generic/pagetable-nopmd.h and asm-generic/pagetable-nopud.h
68 */
69 typedef struct { unsigned long pte; } pte_t;
70 typedef struct { unsigned long pgd; } pgd_t;
71 typedef struct { unsigned long pgprot; } pgprot_t;
72 typedef struct page *pgtable_t;
73
74 #define pte_val(x) ((x).pte)
75 #define pgd_val(x) ((x).pgd)
76 #define pgprot_val(x) ((x).pgprot)
77 #define __pte(x) ((pte_t) { (x) })
78 #define __pgd(x) ((pgd_t) { (x) })
79 #define __pgprot(x) ((pgprot_t) { (x) })
80
81 /*
82 * We need a __pa and a __va routine for kernel space.
83 * MIPS says they're only used during mem_init.
84 * also, check if we need a PHYS_OFFSET.
85 */
86 #define __pa(x) ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET)
87 #define __va(x) ((void *)((unsigned long)(x) - PHYS_OFFSET + PAGE_OFFSET))
88
89 /* The "page frame" descriptor is defined in linux/mm.h */
90 struct page;
91
92 /* Returns page frame descriptor for virtual address. */
93 #define virt_to_page(kaddr) pfn_to_page(PFN_DOWN(__pa(kaddr)))
94
95 /* Default vm area behavior is non-executable. */
96 #define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_NON_EXEC
97
98 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
99
100 /* Need to not use a define for linesize; may move this to another file. */
clear_page(void * page)101 static inline void clear_page(void *page)
102 {
103 /* This can only be done on pages with L1 WB cache */
104 asm volatile(
105 " loop0(1f,%1);\n"
106 "1: { dczeroa(%0);\n"
107 " %0 = add(%0,#32); }:endloop0\n"
108 : "+r" (page)
109 : "r" (PAGE_SIZE/32)
110 : "lc0", "sa0", "memory"
111 );
112 }
113
114 #define copy_page(to, from) memcpy((to), (from), PAGE_SIZE)
115
116 /*
117 * Under assumption that kernel always "sees" user map...
118 */
119 #define clear_user_page(page, vaddr, pg) clear_page(page)
120 #define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
121
122 /*
123 * page_to_phys - convert page to physical address
124 * @page - pointer to page entry in mem_map
125 */
126 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
127
128 #define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT)
129 #define pfn_to_virt(pfn) __va((pfn) << PAGE_SHIFT)
130
131 #define page_to_virt(page) __va(page_to_phys(page))
132
133 #include <asm/mem-layout.h>
134 #include <asm-generic/memory_model.h>
135 /* XXX Todo: implement assembly-optimized version of getorder. */
136 #include <asm-generic/getorder.h>
137
138 #endif /* ifdef __ASSEMBLY__ */
139 #endif /* ifdef __KERNEL__ */
140
141 #endif
142