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