include/asm/page.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 #ifndef _ALPHA_PAGE_H
0003 #define _ALPHA_PAGE_H
0004
0005 #include <linux/const.h>
0006 #include <asm/pal.h>
0007
0008 /* PAGE_SHIFT determines the page size */
0009 #define PAGE_SHIFT  13
0010 #define PAGE_SIZE   (_AC(1,UL) << PAGE_SHIFT)
0011 #define PAGE_MASK   (~(PAGE_SIZE-1))
0012
0013 #ifndef __ASSEMBLY__
0014
0015 #define STRICT_MM_TYPECHECKS
0016
0017 extern void clear_page(void *page);
0018 #define clear_user_page(page, vaddr, pg)    clear_page(page)
0019
0020 #define alloc_zeroed_user_highpage_movable(vma, vaddr) \
0021     alloc_page_vma(GFP_HIGHUSER_MOVABLE | __GFP_ZERO, vma, vaddr)
0022 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE_MOVABLE
0023
0024 extern void copy_page(void * _to, void * _from);
0025 #define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
0026
0027 #ifdef STRICT_MM_TYPECHECKS
0028 /*
0029  * These are used to make use of C type-checking..
0030  */
0031 typedef struct { unsigned long pte; } pte_t;
0032 typedef struct { unsigned long pmd; } pmd_t;
0033 typedef struct { unsigned long pgd; } pgd_t;
0034 typedef struct { unsigned long pgprot; } pgprot_t;
0035
0036 #define pte_val(x)  ((x).pte)
0037 #define pmd_val(x)  ((x).pmd)
0038 #define pgd_val(x)  ((x).pgd)
0039 #define pgprot_val(x)   ((x).pgprot)
0040
0041 #define __pte(x)    ((pte_t) { (x) } )
0042 #define __pmd(x)    ((pmd_t) { (x) } )
0043 #define __pgd(x)    ((pgd_t) { (x) } )
0044 #define __pgprot(x) ((pgprot_t) { (x) } )
0045
0046 #else
0047 /*
0048  * .. while these make it easier on the compiler
0049  */
0050 typedef unsigned long pte_t;
0051 typedef unsigned long pmd_t;
0052 typedef unsigned long pgd_t;
0053 typedef unsigned long pgprot_t;
0054
0055 #define pte_val(x)  (x)
0056 #define pmd_val(x)  (x)
0057 #define pgd_val(x)  (x)
0058 #define pgprot_val(x)   (x)
0059
0060 #define __pte(x)    (x)
0061 #define __pgd(x)    (x)
0062 #define __pgprot(x) (x)
0063
0064 #endif /* STRICT_MM_TYPECHECKS */
0065
0066 typedef struct page *pgtable_t;
0067
0068 #ifdef USE_48_BIT_KSEG
0069 #define PAGE_OFFSET     0xffff800000000000UL
0070 #else
0071 #define PAGE_OFFSET     0xfffffc0000000000UL
0072 #endif
0073
0074 #else
0075
0076 #ifdef USE_48_BIT_KSEG
0077 #define PAGE_OFFSET     0xffff800000000000
0078 #else
0079 #define PAGE_OFFSET     0xfffffc0000000000
0080 #endif
0081
0082 #endif /* !__ASSEMBLY__ */
0083
0084 #define __pa(x)         ((unsigned long) (x) - PAGE_OFFSET)
0085 #define __va(x)         ((void *)((unsigned long) (x) + PAGE_OFFSET))
0086
0087 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
0088 #define virt_addr_valid(kaddr)  pfn_valid((__pa(kaddr) >> PAGE_SHIFT))
0089
0090 #ifdef CONFIG_FLATMEM
0091 #define pfn_valid(pfn)      ((pfn) < max_mapnr)
0092 #endif /* CONFIG_FLATMEM */
0093
0094 #include <asm-generic/memory_model.h>
0095 #include <asm-generic/getorder.h>
0096
0097 #endif /* _ALPHA_PAGE_H */