patch-2.3.23 linux/include/asm-i386/pgtable-2level.h

• Lines: 63
• Date: Tue Oct 19 10:22:20 1999
• Orig file: v2.3.22/linux/include/asm-i386/pgtable-2level.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.22/linux/include/asm-i386/pgtable-2level.h linux/include/asm-i386/pgtable-2level.h
@@ -0,0 +1,62 @@
+#ifndef _I386_PGTABLE_2LEVEL_H
+#define _I386_PGTABLE_2LEVEL_H
+
+/*
+ * traditional i386 two-level paging structure:
+ */
+
+#define PGDIR_SHIFT	22
+#define PTRS_PER_PGD	1024
+
+/*
+ * the i386 is two-level, so we don't really have any
+ * PMD directory physically.
+ */
+#define PMD_SHIFT	22
+#define PTRS_PER_PMD	1
+
+#define PTRS_PER_PTE	1024
+
+#define pte_ERROR(e) \
+	printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
+#define pmd_ERROR(e) \
+	printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
+#define pgd_ERROR(e) \
+	printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
+
+/*
+ * The "pgd_xxx()" functions here are trivial for a folded two-level
+ * setup: the pgd is never bad, and a pmd always exists (as it's folded
+ * into the pgd entry)
+ */
+extern inline int pgd_none(pgd_t pgd)		{ return 0; }
+extern inline int pgd_bad(pgd_t pgd)		{ return 0; }
+extern inline int pgd_present(pgd_t pgd)	{ return 1; }
+#define pgd_clear(xp)	do { pgd_val(*(xp)) = 0; } while (0)
+
+#define pgd_page(pgd) \
+((unsigned long) __va(pgd_val(pgd) & PAGE_MASK))
+
+extern inline pmd_t * pmd_offset(pgd_t * dir, unsigned long address)
+{
+	return (pmd_t *) dir;
+}
+
+extern __inline__ pmd_t *get_pmd_fast(void)
+{
+	return (pmd_t *)0;
+}
+
+extern __inline__ void free_pmd_fast(pmd_t *pmd) { }
+extern __inline__ void free_pmd_slow(pmd_t *pmd) { }
+
+extern inline pmd_t * pmd_alloc(pgd_t *pgd, unsigned long address)
+{
+	if (!pgd)
+		BUG();
+	return (pmd_t *) pgd;
+}
+
+#define SWP_ENTRY(type,offset) __pte((((type) << 1) | ((offset) << 8)))
+
+#endif /* _I386_PGTABLE_2LEVEL_H */