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Linux/arch/openrisc/include/asm/page.h

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  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 */
 93 

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