patch-2.3.43 linux/include/asm-ia64/page.h

• Lines: 135
• Date: Sun Feb 6 18:42:40 2000
• Orig file: v2.3.42/linux/include/asm-ia64/page.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.42/linux/include/asm-ia64/page.h linux/include/asm-ia64/page.h
@@ -0,0 +1,134 @@
+#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);
+
+#  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 __pgd(x)	((pgd_t) { (x) } )
+#define __pgprot(x)	((pgprot_t) { (x) } )
+
+#  else /* !STRICT_MM_TYPECHECKS */
+/*
+ * .. while these make it easier on the compiler
+ */
+typedef unsigned long pte_t;
+typedef unsigned long pmd_t;
+typedef unsigned long pgd_t;
+typedef unsigned long pgprot_t;
+
+#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 */
+
+/*
+ * 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)
+
+/*
+ * This variant works well for the SGI SN1 architecture (which does have huge
+ * holes in the memory address space).
+ */
+#define MAP_NR_SN1(addr)	(((unsigned long) (addr) - PAGE_OFFSET) >> PAGE_SHIFT)
+
+#ifdef CONFIG_IA64_GENERIC
+# define MAP_NR(addr)	platform_map_nr(addr)
+#elif defined (CONFIG_IA64_SN_SN1_SIM)
+# define MAP_NR(addr)	MAP_NR_SN1(addr)
+#else
+# define MAP_NR(addr)	MAP_NR_DENSE(addr)
+#endif
+
+# endif /* __KERNEL__ */
+
+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 BUG() do { printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); *(int *)0=0; } while (0)
+#define PAGE_BUG(page) do { BUG(); } while (0)
+
+#endif /* !ASSEMBLY */
+
+#define PAGE_OFFSET		0xe000000000000000
+
+#endif /* _ASM_IA64_PAGE_H */