patch-2.4.0-test12 linux/include/asm-parisc/mmu.h

• Lines: 65
• Date: Tue Dec 5 12:29:39 2000
• Orig file: v2.4.0-test11/linux/include/asm-parisc/mmu.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.0-test11/linux/include/asm-parisc/mmu.h linux/include/asm-parisc/mmu.h
@@ -0,0 +1,64 @@
+/*
+ * parisc mmu structures 
+ */
+
+#ifndef _PARISC_MMU_H_
+#define _PARISC_MMU_H_
+
+#ifndef __ASSEMBLY__
+/* Hardware Page Table Entry */
+typedef struct _PTE {
+	unsigned long v:1;	/* Entry is valid */
+	unsigned long tag:31;	/* Unique Tag */
+
+	unsigned long r:1;	/* referenced */
+	unsigned long os_1:1;	/*  */
+	unsigned long t:1;	/* page reference trap */
+	unsigned long d:1;	/* dirty */
+	unsigned long b:1;	/* break */
+	unsigned long type:3;	/* access type */
+	unsigned long pl1:2;	/* PL1 (execute) */
+	unsigned long pl2:2;	/* PL2 (write) */
+	unsigned long u:1;	/* uncacheable */
+	unsigned long id:1;	/* access id */
+	unsigned long os_2:1;	/*  */
+
+	unsigned long os_3:3;	/*  */
+	unsigned long res_1:4;	/*  */
+	unsigned long phys:20;	/* physical page number */
+	unsigned long os_4:2;	/*  */
+	unsigned long res_2:3;	/*  */
+
+	unsigned long next;	/* pointer to next page */
+} PTE; 
+
+/*
+ * Simulated two-level MMU.  This structure is used by the kernel
+ * to keep track of MMU mappings and is used to update/maintain
+ * the hardware HASH table which is really a cache of mappings.
+ *
+ * The simulated structures mimic the hardware available on other
+ * platforms, notably the 80x86 and 680x0.
+ */
+
+typedef struct _pte {
+   	unsigned long page_num:20;
+   	unsigned long flags:12;		/* Page flags (some unused bits) */
+} pte;
+
+#define PD_SHIFT (10+12)		/* Page directory */
+#define PD_MASK  0x02FF
+#define PT_SHIFT (12)			/* Page Table */
+#define PT_MASK  0x02FF
+#define PG_SHIFT (12)			/* Page Entry */
+
+/* MMU context */
+
+typedef struct _MMU_context {
+	long	pid[4];
+	pte	**pmap;		/* Two-level page-map structure */
+} MMU_context;
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* _PARISC_MMU_H_ */