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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 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 */
69typedef struct { unsigned long pte; } pte_t;
70typedef struct { unsigned long pgd; } pgd_t;
71typedef struct { unsigned long pgprot; } pgprot_t;
72typedef 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/* Needed for PAGE_OFFSET used in the macro right below */
82#include <asm/mem-layout.h>
83
84/*
85 * We need a __pa and a __va routine for kernel space.
86 * MIPS says they're only used during mem_init.
87 * also, check if we need a PHYS_OFFSET.
88 */
89#define __pa(x) ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET)
90#define __va(x) ((void *)((unsigned long)(x) - PHYS_OFFSET + PAGE_OFFSET))
91
92/* The "page frame" descriptor is defined in linux/mm.h */
93struct page;
94
95/* Returns page frame descriptor for virtual address. */
96#define virt_to_page(kaddr) pfn_to_page(PFN_DOWN(__pa(kaddr)))
97
98/* Default vm area behavior is non-executable. */
99#define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_NON_EXEC
100
101#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
102
103/* Need to not use a define for linesize; may move this to another file. */
104static inline void clear_page(void *page)
105{
106 /* This can only be done on pages with L1 WB cache */
107 asm volatile(
108 " loop0(1f,%1);\n"
109 "1: { dczeroa(%0);\n"
110 " %0 = add(%0,#32); }:endloop0\n"
111 : "+r" (page)
112 : "r" (PAGE_SIZE/32)
113 : "lc0", "sa0", "memory"
114 );
115}
116
117#define copy_page(to, from) memcpy((to), (from), PAGE_SIZE)
118
119/*
120 * Under assumption that kernel always "sees" user map...
121 */
122#define clear_user_page(page, vaddr, pg) clear_page(page)
123#define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
124
125/*
126 * page_to_phys - convert page to physical address
127 * @page - pointer to page entry in mem_map
128 */
129#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
130
131static inline unsigned long virt_to_pfn(const void *kaddr)
132{
133 return __pa(kaddr) >> PAGE_SHIFT;
134}
135
136static inline void *pfn_to_virt(unsigned long pfn)
137{
138 return (void *)((unsigned long)__va(pfn) << PAGE_SHIFT);
139}
140
141
142#define page_to_virt(page) __va(page_to_phys(page))
143
144#include <asm/mem-layout.h>
145#include <asm-generic/memory_model.h>
146/* XXX Todo: implement assembly-optimized version of getorder. */
147#include <asm-generic/getorder.h>
148
149#endif /* ifdef __ASSEMBLY__ */
150#endif /* ifdef __KERNEL__ */
151
152#endif