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/*
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 */
90struct 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 pfn_valid(pfn) ((pfn) < max_mapnr)
99#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
100
101/*  Need to not use a define for linesize; may move this to another file.  */
102static inline void clear_page(void *page)
103{
104	/*  This can only be done on pages with L1 WB cache */
105	asm volatile(
106		"	loop0(1f,%1);\n"
107		"1:	{ dczeroa(%0);\n"
108		"	  %0 = add(%0,#32); }:endloop0\n"
109		: "+r" (page)
110		: "r" (PAGE_SIZE/32)
111		: "lc0", "sa0", "memory"
112	);
113}
114
115#define copy_page(to, from)	memcpy((to), (from), PAGE_SIZE)
116
117/*
118 * Under assumption that kernel always "sees" user map...
119 */
120#define clear_user_page(page, vaddr, pg)	clear_page(page)
121#define copy_user_page(to, from, vaddr, pg)	copy_page(to, from)
122
123/*
124 * page_to_phys - convert page to physical address
125 * @page - pointer to page entry in mem_map
126 */
127#define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
128
129#define virt_to_pfn(kaddr)      (__pa(kaddr) >> PAGE_SHIFT)
130#define pfn_to_virt(pfn)        __va((pfn) << PAGE_SHIFT)
131
132#define page_to_virt(page)	__va(page_to_phys(page))
133
134/*
135 * For port to Hexagon Virtual Machine, MAYBE we check for attempts
136 * to reference reserved HVM space, but in any case, the VM will be
137 * protected.
138 */
139#define kern_addr_valid(addr)   (1)
140
141#include <asm/mem-layout.h>
142#include <asm-generic/memory_model.h>
143/* XXX Todo: implement assembly-optimized version of getorder. */
144#include <asm-generic/getorder.h>
145
146#endif /* ifdef __ASSEMBLY__ */
147#endif /* ifdef __KERNEL__ */
148
149#endif
150