/arch/sparc/include/asm/page_64.h

  1#ifndef _SPARC64_PAGE_H
  2#define _SPARC64_PAGE_H
  3
  4#include <linux/const.h>
  5
  6#if defined(CONFIG_SPARC64_PAGE_SIZE_8KB)
  7#define PAGE_SHIFT   13
  8#elif defined(CONFIG_SPARC64_PAGE_SIZE_64KB)
  9#define PAGE_SHIFT   16
 10#else
 11#error No page size specified in kernel configuration
 12#endif
 13
 14#define PAGE_SIZE    (_AC(1,UL) << PAGE_SHIFT)
 15#define PAGE_MASK    (~(PAGE_SIZE-1))
 16
 17/* Flushing for D-cache alias handling is only needed if
 18 * the page size is smaller than 16K.
 19 */
 20#if PAGE_SHIFT < 14
 21#define DCACHE_ALIASING_POSSIBLE
 22#endif
 23
 24#if defined(CONFIG_HUGETLB_PAGE_SIZE_4MB)
 25#define HPAGE_SHIFT		22
 26#elif defined(CONFIG_HUGETLB_PAGE_SIZE_512K)
 27#define HPAGE_SHIFT		19
 28#elif defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
 29#define HPAGE_SHIFT		16
 30#endif
 31
 32#ifdef CONFIG_HUGETLB_PAGE
 33#define HPAGE_SIZE		(_AC(1,UL) << HPAGE_SHIFT)
 34#define HPAGE_MASK		(~(HPAGE_SIZE - 1UL))
 35#define HUGETLB_PAGE_ORDER	(HPAGE_SHIFT - PAGE_SHIFT)
 36#define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
 37#endif
 38
 39#ifndef __ASSEMBLY__
 40
 41#define WANT_PAGE_VIRTUAL
 42
 43extern void _clear_page(void *page);
 44#define clear_page(X)	_clear_page((void *)(X))
 45struct page;
 46extern void clear_user_page(void *addr, unsigned long vaddr, struct page *page);
 47#define copy_page(X,Y)	memcpy((void *)(X), (void *)(Y), PAGE_SIZE)
 48extern void copy_user_page(void *to, void *from, unsigned long vaddr, struct page *topage);
 49
 50/* Unlike sparc32, sparc64's parameter passing API is more
 51 * sane in that structures which as small enough are passed
 52 * in registers instead of on the stack.  Thus, setting
 53 * STRICT_MM_TYPECHECKS does not generate worse code so
 54 * let's enable it to get the type checking.
 55 */
 56
 57#define STRICT_MM_TYPECHECKS
 58
 59#ifdef STRICT_MM_TYPECHECKS
 60/* These are used to make use of C type-checking.. */
 61typedef struct { unsigned long pte; } pte_t;
 62typedef struct { unsigned long iopte; } iopte_t;
 63typedef struct { unsigned int pmd; } pmd_t;
 64typedef struct { unsigned int pgd; } pgd_t;
 65typedef struct { unsigned long pgprot; } pgprot_t;
 66
 67#define pte_val(x)	((x).pte)
 68#define iopte_val(x)	((x).iopte)
 69#define pmd_val(x)      ((x).pmd)
 70#define pgd_val(x)	((x).pgd)
 71#define pgprot_val(x)	((x).pgprot)
 72
 73#define __pte(x)	((pte_t) { (x) } )
 74#define __iopte(x)	((iopte_t) { (x) } )
 75#define __pmd(x)        ((pmd_t) { (x) } )
 76#define __pgd(x)	((pgd_t) { (x) } )
 77#define __pgprot(x)	((pgprot_t) { (x) } )
 78
 79#else
 80/* .. while these make it easier on the compiler */
 81typedef unsigned long pte_t;
 82typedef unsigned long iopte_t;
 83typedef unsigned int pmd_t;
 84typedef unsigned int pgd_t;
 85typedef unsigned long pgprot_t;
 86
 87#define pte_val(x)	(x)
 88#define iopte_val(x)	(x)
 89#define pmd_val(x)      (x)
 90#define pgd_val(x)	(x)
 91#define pgprot_val(x)	(x)
 92
 93#define __pte(x)	(x)
 94#define __iopte(x)	(x)
 95#define __pmd(x)        (x)
 96#define __pgd(x)	(x)
 97#define __pgprot(x)	(x)
 98
 99#endif /* (STRICT_MM_TYPECHECKS) */
100
101typedef struct page *pgtable_t;
102
103#define TASK_UNMAPPED_BASE	(test_thread_flag(TIF_32BIT) ? \
104				 (_AC(0x0000000070000000,UL)) : \
105				 (_AC(0xfffff80000000000,UL) + (1UL << 32UL)))
106
107#include <asm-generic/memory_model.h>
108
109#endif /* !(__ASSEMBLY__) */
110
111/* We used to stick this into a hard-coded global register (%g4)
112 * but that does not make sense anymore.
113 */
114#define PAGE_OFFSET		_AC(0xFFFFF80000000000,UL)
115
116#ifndef __ASSEMBLY__
117
118#define __pa(x)			((unsigned long)(x) - PAGE_OFFSET)
119#define __va(x)			((void *)((unsigned long) (x) + PAGE_OFFSET))
120
121#define pfn_to_kaddr(pfn)	__va((pfn) << PAGE_SHIFT)
122
123#define virt_to_page(kaddr)	pfn_to_page(__pa(kaddr)>>PAGE_SHIFT)
124
125#define virt_addr_valid(kaddr)	pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
126
127#define virt_to_phys __pa
128#define phys_to_virt __va
129
130#endif /* !(__ASSEMBLY__) */
131
132#define VM_DATA_DEFAULT_FLAGS	(VM_READ | VM_WRITE | VM_EXEC | \
133				 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
134
135#include <asm-generic/getorder.h>
136
137#endif /* _SPARC64_PAGE_H */