arch/openrisc/include/asm/page.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * OpenRISC Linux
   4  *
   5  * Linux architectural port borrowing liberally from similar works of
   6  * others.  All original copyrights apply as per the original source
   7  * declaration.
   8  *
   9  * OpenRISC implementation:
  10  * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
  11  * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
  12  * et al.
  13  */
  14
  15 #ifndef __ASM_OPENRISC_PAGE_H
  16 #define __ASM_OPENRISC_PAGE_H
  17
  18
  19 /* PAGE_SHIFT determines the page size */
  20
  21 #define PAGE_SHIFT      13
  22 #ifdef __ASSEMBLY__
  23 #define PAGE_SIZE       (1 << PAGE_SHIFT)
  24 #else
  25 #define PAGE_SIZE       (1UL << PAGE_SHIFT)
  26 #endif
  27 #define PAGE_MASK       (~(PAGE_SIZE-1))
  28
  29 #define PAGE_OFFSET     0xc0000000
  30 #define KERNELBASE      PAGE_OFFSET
  31
  32 /* This is not necessarily the right place for this, but it's needed by
  33  * drivers/of/fdt.c
  34  */
  35 #include <asm/setup.h>
  36
  37 #ifndef __ASSEMBLY__
  38
  39 #define clear_page(page)        memset((page), 0, PAGE_SIZE)
  40 #define copy_page(to, from)     memcpy((to), (from), PAGE_SIZE)
  41
  42 #define clear_user_page(page, vaddr, pg)        clear_page(page)
  43 #define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
  44
  45 /*
  46  * These are used to make use of C type-checking..
  47  */
  48 typedef struct {
  49         unsigned long pte;
  50 } pte_t;
  51 typedef struct {
  52         unsigned long pgd;
  53 } pgd_t;
  54 typedef struct {
  55         unsigned long pgprot;
  56 } pgprot_t;
  57 typedef struct page *pgtable_t;
  58
  59 #define pte_val(x)      ((x).pte)
  60 #define pgd_val(x)      ((x).pgd)
  61 #define pgprot_val(x)   ((x).pgprot)
  62
  63 #define __pte(x)        ((pte_t) { (x) })
  64 #define __pgd(x)        ((pgd_t) { (x) })
  65 #define __pgprot(x)     ((pgprot_t) { (x) })
  66
  67 #endif /* !__ASSEMBLY__ */
  68
  69
  70 #ifndef __ASSEMBLY__
  71
  72 #define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET))
  73 #define __pa(x) ((unsigned long) (x) - PAGE_OFFSET)
  74
  75 #define virt_to_pfn(kaddr)      (__pa(kaddr) >> PAGE_SHIFT)
  76 #define pfn_to_virt(pfn)        __va((pfn) << PAGE_SHIFT)
  77
  78 #define virt_to_page(addr) \
  79         (mem_map + (((unsigned long)(addr)-PAGE_OFFSET) >> PAGE_SHIFT))
  80
  81 #define page_to_phys(page)      ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
  82
  83 #define pfn_valid(pfn)          ((pfn) < max_mapnr)
  84
  85 #define virt_addr_valid(kaddr)  (pfn_valid(virt_to_pfn(kaddr)))
  86
  87 #endif /* __ASSEMBLY__ */
  88
  89 #include <asm-generic/memory_model.h>
  90 #include <asm-generic/getorder.h>
  91
  92 #endif /* __ASM_OPENRISC_PAGE_H */