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#define PAGE_SHIFT CONFIG_PAGE_SHIFT
49#define PAGE_SIZE  (1UL << PAGE_SHIFT)
50#define PAGE_MASK  (~((1 << PAGE_SHIFT) - 1))
51
52#ifdef __KERNEL__
53#ifndef __ASSEMBLY__
54
55/*
56 * This is for PFN_DOWN, which mm.h needs.  Seems the right place to pull it in.
57 */
58#include <linux/pfn.h>
59
60/*
61 * We implement a two-level architecture-specific page table structure.
62 * Null intermediate page table level (pmd, pud) definitions will come from
63 * asm-generic/pagetable-nopmd.h and asm-generic/pagetable-nopud.h
64 */
65typedef struct { unsigned long pte; } pte_t;
66typedef struct { unsigned long pgd; } pgd_t;
67typedef struct { unsigned long pgprot; } pgprot_t;
68typedef struct page *pgtable_t;
69
70#define pte_val(x)     ((x).pte)
71#define pgd_val(x)     ((x).pgd)
72#define pgprot_val(x)  ((x).pgprot)
73#define __pte(x)       ((pte_t) { (x) })
74#define __pgd(x)       ((pgd_t) { (x) })
75#define __pgprot(x)    ((pgprot_t) { (x) })
76
77/* Needed for PAGE_OFFSET used in the macro right below */
78#include <asm/mem-layout.h>
79
80/*
81 * We need a __pa and a __va routine for kernel space.
82 * MIPS says they're only used during mem_init.
83 * also, check if we need a PHYS_OFFSET.
84 */
85#define __pa(x) ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET)
86#define __va(x) ((void *)((unsigned long)(x) - PHYS_OFFSET + PAGE_OFFSET))
87
88/* The "page frame" descriptor is defined in linux/mm.h */
89struct page;
90
91/* Returns page frame descriptor for virtual address. */
92#define virt_to_page(kaddr) pfn_to_page(PFN_DOWN(__pa(kaddr)))
93
94/* Default vm area behavior is non-executable.  */
95#define VM_DATA_DEFAULT_FLAGS	VM_DATA_FLAGS_NON_EXEC
96
97#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
98
99/*  Need to not use a define for linesize; may move this to another file.  */
100static inline void clear_page(void *page)
101{
102	/*  This can only be done on pages with L1 WB cache */
103	asm volatile(
104		"	loop0(1f,%1);\n"
105		"1:	{ dczeroa(%0);\n"
106		"	  %0 = add(%0,#32); }:endloop0\n"
107		: "+r" (page)
108		: "r" (PAGE_SIZE/32)
109		: "lc0", "sa0", "memory"
110	);
111}
112
113#define copy_page(to, from)	memcpy((to), (from), PAGE_SIZE)
114
115/*
116 * Under assumption that kernel always "sees" user map...
117 */
118#define clear_user_page(page, vaddr, pg)	clear_page(page)
119#define copy_user_page(to, from, vaddr, pg)	copy_page(to, from)
120
121/*
122 * page_to_phys - convert page to physical address
123 * @page - pointer to page entry in mem_map
124 */
125#define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
126
127static inline unsigned long virt_to_pfn(const void *kaddr)
128{
129	return __pa(kaddr) >> PAGE_SHIFT;
130}
131
132#define page_to_virt(page)	__va(page_to_phys(page))
133
134#include <asm/mem-layout.h>
135#include <asm-generic/memory_model.h>
136/* XXX Todo: implement assembly-optimized version of getorder. */
137#include <asm-generic/getorder.h>
138
139#endif /* ifdef __ASSEMBLY__ */
140#endif /* ifdef __KERNEL__ */
141
142#endif
143