arch/m32r/include/asm/page.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_M32R_PAGE_H
   3 #define _ASM_M32R_PAGE_H
   4
   5 #include <linux/const.h>
   6
   7 /* PAGE_SHIFT determines the page size */
   8 #define PAGE_SHIFT      12
   9 #define PAGE_SIZE       (_AC(1, UL) << PAGE_SHIFT)
  10 #define PAGE_MASK       (~(PAGE_SIZE-1))
  11
  12 #ifndef __ASSEMBLY__
  13
  14 extern void clear_page(void *to);
  15 extern void copy_page(void *to, void *from);
  16
  17 #define clear_user_page(page, vaddr, pg)        clear_page(page)
  18 #define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
  19
  20 #define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \
  21         alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr)
  22 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
  23
  24 /*
  25  * These are used to make use of C type-checking..
  26  */
  27 typedef struct { unsigned long pte; } pte_t;
  28 typedef struct { unsigned long pmd; } pmd_t;
  29 typedef struct { unsigned long pgd; } pgd_t;
  30 #define pte_val(x)      ((x).pte)
  31 #define PTE_MASK        PAGE_MASK
  32
  33 typedef struct { unsigned long pgprot; } pgprot_t;
  34 typedef struct page *pgtable_t;
  35
  36 #define pmd_val(x)      ((x).pmd)
  37 #define pgd_val(x)      ((x).pgd)
  38 #define pgprot_val(x)   ((x).pgprot)
  39
  40 #define __pte(x) ((pte_t) { (x) } )
  41 #define __pmd(x) ((pmd_t) { (x) } )
  42 #define __pgd(x) ((pgd_t) { (x) } )
  43 #define __pgprot(x)     ((pgprot_t) { (x) } )
  44
  45 #endif /* !__ASSEMBLY__ */
  46
  47 /*
  48  * This handles the memory map.. We could make this a config
  49  * option, but too many people screw it up, and too few need
  50  * it.
  51  *
  52  * A __PAGE_OFFSET of 0xC0000000 means that the kernel has
  53  * a virtual address space of one gigabyte, which limits the
  54  * amount of physical memory you can use to about 950MB.
  55  *
  56  * If you want more physical memory than this then see the CONFIG_HIGHMEM4G
  57  * and CONFIG_HIGHMEM64G options in the kernel configuration.
  58  */
  59
  60 #define __MEMORY_START  CONFIG_MEMORY_START
  61 #define __MEMORY_SIZE   CONFIG_MEMORY_SIZE
  62
  63 #ifdef CONFIG_MMU
  64 #define __PAGE_OFFSET  (0x80000000)
  65 #else
  66 #define __PAGE_OFFSET  (0x00000000)
  67 #endif
  68
  69 #define PAGE_OFFSET             ((unsigned long)__PAGE_OFFSET)
  70 #define __pa(x)                 ((unsigned long)(x) - PAGE_OFFSET)
  71 #define __va(x)                 ((void *)((unsigned long)(x) + PAGE_OFFSET))
  72
  73 #ifndef CONFIG_DISCONTIGMEM
  74 #define PFN_BASE                (CONFIG_MEMORY_START >> PAGE_SHIFT)
  75 #define ARCH_PFN_OFFSET         PFN_BASE
  76 #define pfn_valid(pfn)          (((pfn) - PFN_BASE) < max_mapnr)
  77 #endif  /* !CONFIG_DISCONTIGMEM */
  78
  79 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
  80 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
  81
  82 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
  83                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC )
  84
  85 #define devmem_is_allowed(x) 1
  86
  87 #include <asm-generic/memory_model.h>
  88 #include <asm-generic/getorder.h>
  89
  90 #endif /* _ASM_M32R_PAGE_H */