patch-1.3.71 linux/arch/sparc/mm/s4clow.h

• Lines: 49
• Date: Mon Mar 4 08:49:58 1996
• Orig file: v1.3.70/linux/arch/sparc/mm/s4clow.h
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v1.3.70/linux/arch/sparc/mm/s4clow.h linux/arch/sparc/mm/s4clow.h
@@ -0,0 +1,48 @@
+/* s4clow.h: Defines for in-window low level tlb refill code.
+ *
+ * Copyright (C) 1995 David S. Miller (davem@caipfs.rutgers.edu)
+ */
+#ifndef _SPARC_S4CLOW_H
+#define _SPARC_S4CLOW_H
+
+#define         PAGE_SIZE       0x00001000
+#define		REAL_PGDIR_MASK	0xfffc0000
+#define		VMALLOC_START	0xfe100000
+
+#define		RING_RINGHD	0x00
+#define		RING_NENTRIES   0x10
+
+#define		MMU_ENTRY_NEXT	0x00
+#define		MMU_ENTRY_PREV	0x04
+#define		MMU_ENTRY_VADDR	0x08
+#define		MMU_ENTRY_PSEG	0x0c
+#define		MMU_ENTRY_LCK	0x0d
+
+#define		VACINFO_SIZE	0x00
+#define		VACINFO_HWFLSH	0x08
+#define		VACINFO_LSIZE	0x0c
+
+/* Each of the routines could get called by any of the
+ * other low level sun4c tlb routines.  Well... at least
+ * we code it that way.  Because we are in window we need
+ * a way to make a routine completely self contained and
+ * only need to worry about saving it's own set of registers
+ * which it in fact uses.  With traps off this is difficult
+ * ... however...
+ *
+ * The Sparc can address anywhere in the two ranges
+ * 0 --> PAGE_SIZE and -PAGE_SIZE --> -1 without any
+ * address calculation registers.  So we pull a trick,
+ * we map a special page for these low level tlb routines
+ * since they must be as quick as possible.  Since the low
+ * page is the NULL unmapped page and in user space we use
+ * the high one for simplicity.  Kids, do not try this at
+ * home.
+ */
+#define          REGSAVE_BASE   (-PAGE_SIZE)
+
+#define          FLUSHREGS      0
+#define          KFLTREGS       256
+#define          UFLTREGS       512
+
+#endif /* !(_SPARC_S4CLOW_H) */