patch-2.1.79 linux/include/asm-sparc/io-unit.h

• Lines: 44
• Date: Mon Jan 12 15:15:54 1998
• Orig file: v2.1.78/linux/include/asm-sparc/io-unit.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.78/linux/include/asm-sparc/io-unit.h linux/include/asm-sparc/io-unit.h
@@ -0,0 +1,43 @@
+/* io-unit.h: Definitions for the sun4d IO-UNIT.
+ *
+ * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
+ */
+#ifndef _SPARC_IO_UNIT_H
+#define _SPARC_IO_UNIT_H
+
+#include <asm/page.h>
+#include <asm/spinlock.h>
+
+/* The io-unit handles all virtual to physical address translations
+ * that occur between the SBUS and physical memory.  Access by
+ * the cpu to IO registers and similar go over the xdbus so are
+ * translated by the on chip SRMMU.  The io-unit and the srmmu do
+ * not need to have the same translations at all, in fact most
+ * of the time the translations they handle are a disjunct set.
+ * Basically the io-unit handles all dvma sbus activity.
+ */
+ 
+/* AIEEE, unlike the nice sun4m, these monsters have 
+   fixed DMA range 64M */
+ 
+#define IOUNIT_DMA_BASE	    0xfc000000 /* TOP - 64M */
+#define IOUNIT_DMA_SIZE	    0x04000000 /* 64M */
+/* We use last 4M for sparc_dvma_malloc */
+#define IOUNIT_DVMA_SIZE    0x00400000 /* 4M */
+
+/* The format of an iopte in the external page tables */
+#define IOUPTE_PAGE          0xffffff00 /* Physical page number (PA[35:12]) */
+#define IOUPTE_CACHE         0x00000080 /* Cached (in Viking/MXCC) */
+#define IOUPTE_STREAM        0x00000040
+#define IOUPTE_INTRA	     0x00000008 /* Not regular memory - probably direct sbus<->sbus dma 
+					   FIXME: Play with this and find out how we can make use of this */
+#define IOUPTE_WRITE         0x00000004 /* Writeable */
+#define IOUPTE_VALID         0x00000002 /* IOPTE is valid */
+#define IOUPTE_PARITY        0x00000001
+
+struct iounit_struct {
+	spinlock_t		iommu_lock;
+	iopte_t			*page_table;
+};
+
+#endif /* !(_SPARC_IO_UNIT_H) */