page.h

  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