page.h

  1/* SPDX-License-Identifier: GPL-2.0 */
  2/*
  3 * VM ops
  4 *
  5 * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
  6 * Copyright (C) 2008-2009 PetaLogix
  7 * Copyright (C) 2006 Atmark Techno, Inc.
  8 * Changes for MMU support:
  9 *    Copyright (C) 2007 Xilinx, Inc.  All rights reserved.
 10 */
 11
 12#ifndef _ASM_MICROBLAZE_PAGE_H
 13#define _ASM_MICROBLAZE_PAGE_H
 14
 15#include <linux/pfn.h>
 16#include <asm/setup.h>
 17#include <asm/asm-compat.h>
 18#include <linux/const.h>
 19
 20#ifdef __KERNEL__
 21
 22#include <vdso/page.h>
 23
 24#define LOAD_OFFSET	ASM_CONST((CONFIG_KERNEL_START-CONFIG_KERNEL_BASE_ADDR))
 25
 26#define PTE_SHIFT	(PAGE_SHIFT - 2)	/* 1024 ptes per page */
 27
 28#ifndef __ASSEMBLER__
 29
 30/*
 31 * PAGE_OFFSET -- the first address of the first page of memory. With MMU
 32 * it is set to the kernel start address (aligned on a page boundary).
 33 *
 34 * CONFIG_KERNEL_START is defined in arch/microblaze/config.in and used
 35 * in arch/microblaze/Makefile.
 36 */
 37#define PAGE_OFFSET	CONFIG_KERNEL_START
 38
 39/*
 40 * The basic type of a PTE - 32 bit physical addressing.
 41 */
 42typedef unsigned long pte_basic_t;
 43#define PTE_FMT		"%.8lx"
 44
 45# define copy_page(to, from)			memcpy((to), (from), PAGE_SIZE)
 46# define clear_page(pgaddr)			memset((pgaddr), 0, PAGE_SIZE)
 47
 48# define clear_user_page(pgaddr, vaddr, page)	memset((pgaddr), 0, PAGE_SIZE)
 49# define copy_user_page(vto, vfrom, vaddr, topg) \
 50			memcpy((vto), (vfrom), PAGE_SIZE)
 51
 52/*
 53 * These are used to make use of C type-checking..
 54 */
 55typedef struct page *pgtable_t;
 56typedef struct { unsigned long	pte; }		pte_t;
 57typedef struct { unsigned long	pgprot; }	pgprot_t;
 58/* FIXME this can depend on linux kernel version */
 59typedef struct { unsigned long pgd; } pgd_t;
 60
 61# define pte_val(x)	((x).pte)
 62# define pgprot_val(x)	((x).pgprot)
 63
 64#   define pgd_val(x)      ((x).pgd)
 65
 66# define __pte(x)	((pte_t) { (x) })
 67# define __pgd(x)	((pgd_t) { (x) })
 68# define __pgprot(x)	((pgprot_t) { (x) })
 69
 70/**
 71 * Conversions for virtual address, physical address, pfn, and struct
 72 * page are defined in the following files.
 73 *
 74 * virt -+
 75 *	 | asm-microblaze/page.h
 76 * phys -+
 77 *	 | linux/pfn.h
 78 *  pfn -+
 79 *	 | asm-generic/memory_model.h
 80 * page -+
 81 *
 82 */
 83
 84extern unsigned long max_low_pfn;
 85extern unsigned long min_low_pfn;
 86extern unsigned long max_pfn;
 87
 88extern unsigned long memory_start;
 89extern unsigned long memory_size;
 90extern unsigned long lowmem_size;
 91
 92extern unsigned long kernel_tlb;
 93
 94extern int page_is_ram(unsigned long pfn);
 95
 96# define phys_to_pfn(phys)	(PFN_DOWN(phys))
 97# define pfn_to_phys(pfn)	(PFN_PHYS(pfn))
 98
 99#  define virt_to_page(kaddr)	(pfn_to_page(__pa(kaddr) >> PAGE_SHIFT))
100#  define page_to_virt(page)   __va(page_to_pfn(page) << PAGE_SHIFT)
101
102#  define ARCH_PFN_OFFSET	(memory_start >> PAGE_SHIFT)
103# endif /* __ASSEMBLER__ */
104
105/* Convert between virtual and physical address for MMU. */
106/* Handle MicroBlaze processor with virtual memory. */
107#define __virt_to_phys(addr) \
108	((addr) + CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
109#define __phys_to_virt(addr) \
110	((addr) + CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR)
111#define tophys(rd, rs) \
112	addik rd, rs, (CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
113#define tovirt(rd, rs) \
114	addik rd, rs, (CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR)
115
116#ifndef __ASSEMBLER__
117
118# define __pa(x)	__virt_to_phys((unsigned long)(x))
119# define __va(x)	((void *)__phys_to_virt((unsigned long)(x)))
120
121static inline unsigned long virt_to_pfn(const void *vaddr)
122{
123	return phys_to_pfn(__pa(vaddr));
124}
125
126static inline const void *pfn_to_virt(unsigned long pfn)
127{
128	return __va(pfn_to_phys((pfn)));
129}
130
131#define	virt_addr_valid(vaddr)	(pfn_valid(virt_to_pfn(vaddr)))
132
133#endif /* __ASSEMBLER__ */
134
135#define TOPHYS(addr)  __virt_to_phys(addr)
136
137#endif /* __KERNEL__ */
138
139#include <asm-generic/memory_model.h>
140#include <asm-generic/getorder.h>
141
142#endif /* _ASM_MICROBLAZE_PAGE_H */