- #ifndef _ASM_IA64_PAGE_H
- #define _ASM_IA64_PAGE_H
- /*
- * Pagetable related stuff.
- *
- * Copyright (C) 1998, 1999 Hewlett-Packard Co
- * Copyright (C) 1998, 1999 David Mosberger-Tang <davidm@hpl.hp.com>
- */
- #include <linux/config.h>
- #include <asm/types.h>
- /*
- * PAGE_SHIFT determines the actual kernel page size.
- */
- #if defined(CONFIG_IA64_PAGE_SIZE_4KB)
- # define PAGE_SHIFT 12
- #elif defined(CONFIG_IA64_PAGE_SIZE_8KB)
- # define PAGE_SHIFT 13
- #elif defined(CONFIG_IA64_PAGE_SIZE_16KB)
- # define PAGE_SHIFT 14
- #elif defined(CONFIG_IA64_PAGE_SIZE_64KB)
- # define PAGE_SHIFT 16
- #else
- # error Unsupported page size!
- #endif
- #define PAGE_SIZE (__IA64_UL_CONST(1) << PAGE_SHIFT)
- #define PAGE_MASK (~(PAGE_SIZE - 1))
- #define PAGE_ALIGN(addr) (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
- #ifdef __ASSEMBLY__
- # define __pa(x) ((x) - PAGE_OFFSET)
- # define __va(x) ((x) + PAGE_OFFSET)
- #else /* !__ASSEMBLY */
- # ifdef __KERNEL__
- # define STRICT_MM_TYPECHECKS
- extern void clear_page (void *page);
- extern void copy_page (void *to, void *from);
- /*
- * Note: the MAP_NR_*() macro can't use __pa() because MAP_NR_*(X) MUST
- * map to something >= max_mapnr if X is outside the identity mapped
- * kernel space.
- */
- /*
- * The dense variant can be used as long as the size of memory holes isn't
- * very big.
- */
- #define MAP_NR_DENSE(addr) (((unsigned long) (addr) - PAGE_OFFSET) >> PAGE_SHIFT)
- #ifdef CONFIG_IA64_GENERIC
- # include <asm/machvec.h>
- # define virt_to_page(kaddr) (mem_map + platform_map_nr(kaddr))
- # define page_to_phys(page) XXX fix me
- #elif defined (CONFIG_IA64_SGI_SN1)
- # ifndef CONFIG_DISCONTIGMEM
- # define virt_to_page(kaddr) (mem_map + MAP_NR_DENSE(kaddr))
- # define page_to_phys(page) XXX fix me
- # endif
- #else
- # define virt_to_page(kaddr) (mem_map + MAP_NR_DENSE(kaddr))
- # define page_to_phys(page) ((page - mem_map) << PAGE_SHIFT)
- #endif
- #define VALID_PAGE(page) ((page - mem_map) < max_mapnr)
- typedef union ia64_va {
- struct {
- unsigned long off : 61; /* intra-region offset */
- unsigned long reg : 3; /* region number */
- } f;
- unsigned long l;
- void *p;
- } ia64_va;
- /*
- * Note: These macros depend on the fact that PAGE_OFFSET has all
- * region bits set to 1 and all other bits set to zero. They are
- * expressed in this way to ensure they result in a single "dep"
- * instruction.
- */
- #define __pa(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg = 0; _v.l;})
- #define __va(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg = -1; _v.p;})
- #define REGION_NUMBER(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg;})
- #define REGION_OFFSET(x) ({ia64_va _v; _v.l = (long) (x); _v.f.off;})
- #define REGION_SIZE REGION_NUMBER(1)
- #define REGION_KERNEL 7
- #define BUG() do { printk("kernel BUG at %s:%d!n", __FILE__, __LINE__); *(int *)0=0; } while (0)
- #define PAGE_BUG(page) do { BUG(); } while (0)
- static __inline__ int
- get_order (unsigned long size)
- {
- double d = size - 1;
- long order;
- __asm__ ("getf.exp %0=%1" : "=r"(order) : "f"(d));
- order = order - PAGE_SHIFT - 0xffff + 1;
- if (order < 0)
- order = 0;
- return order;
- }
- # endif /* __KERNEL__ */
- #endif /* !__ASSEMBLY__ */
- #ifdef STRICT_MM_TYPECHECKS
- /*
- * These are used to make use of C type-checking..
- */
- typedef struct { unsigned long pte; } pte_t;
- typedef struct { unsigned long pmd; } pmd_t;
- typedef struct { unsigned long pgd; } pgd_t;
- typedef struct { unsigned long pgprot; } pgprot_t;
- # define pte_val(x) ((x).pte)
- # define pmd_val(x) ((x).pmd)
- # define pgd_val(x) ((x).pgd)
- # define pgprot_val(x) ((x).pgprot)
- # define __pte(x) ((pte_t) { (x) } )
- # define __pgprot(x) ((pgprot_t) { (x) } )
- #else /* !STRICT_MM_TYPECHECKS */
- /*
- * .. while these make it easier on the compiler
- */
- # ifndef __ASSEMBLY__
- typedef unsigned long pte_t;
- typedef unsigned long pmd_t;
- typedef unsigned long pgd_t;
- typedef unsigned long pgprot_t;
- # endif
- # define pte_val(x) (x)
- # define pmd_val(x) (x)
- # define pgd_val(x) (x)
- # define pgprot_val(x) (x)
- # define __pte(x) (x)
- # define __pgd(x) (x)
- # define __pgprot(x) (x)
- #endif /* !STRICT_MM_TYPECHECKS */
- #define PAGE_OFFSET 0xe000000000000000
- #endif /* _ASM_IA64_PAGE_H */