patch-2.3.99-pre8 linux/include/asm-s390/io.h

• Lines: 95
• Date: Fri May 12 11:41:44 2000
• Orig file: v2.3.99-pre7/linux/include/asm-s390/io.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.99-pre7/linux/include/asm-s390/io.h linux/include/asm-s390/io.h
@@ -0,0 +1,94 @@
+/*
+ *  include/asm-s390/io.h
+ *
+ *  S390 version
+ *    Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
+ *
+ *  Derived from "include/asm-i386/io.h"
+ */
+
+#ifndef _S390_IO_H
+#define _S390_IO_H
+
+#ifdef __KERNEL__
+
+#include <linux/vmalloc.h>
+#include <asm/page.h>
+
+#define IO_SPACE_LIMIT 0xffffffff
+
+#define __io_virt(x)            ((void *)(PAGE_OFFSET | (unsigned long)(x)))
+#define __io_phys(x)            ((unsigned long)(x) & ~PAGE_OFFSET)
+/*
+ * Change virtual addresses to physical addresses and vv.
+ * These are pretty trivial
+ */
+extern inline unsigned long virt_to_phys(volatile void * address)
+{
+	unsigned long real_address;
+	__asm__ ("   lra    %0,0(0,%1)\n"
+                 "   jz     0f\n"
+                 "   sr     %0,%0\n"
+                 "0:"
+                 : "=a" (real_address) : "a" (address) );
+        return real_address;
+}
+
+extern inline void * phys_to_virt(unsigned long address)
+{
+        return __io_virt(address);
+}
+
+extern void * __ioremap(unsigned long offset, unsigned long size, unsigned long flags);
+
+extern inline void * ioremap (unsigned long offset, unsigned long size)
+{
+        return __ioremap(offset, size, 0);
+}
+
+/*
+ * This one maps high address device memory and turns off caching for that area.
+ * it's useful if some control registers are in such an area and write combining
+ * or read caching is not desirable:
+ */
+extern inline void * ioremap_nocache (unsigned long offset, unsigned long size)
+{
+        return __ioremap(offset, size, 0);
+}
+
+extern void iounmap(void *addr);
+
+/*
+ * IO bus memory addresses are also 1:1 with the physical address
+ */
+#define virt_to_bus virt_to_phys
+#define bus_to_virt phys_to_virt
+
+/*
+ * readX/writeX() are used to access memory mapped devices. On some
+ * architectures the memory mapped IO stuff needs to be accessed
+ * differently.
+ */
+
+#define readb(addr) (*(volatile unsigned char *) __io_virt(addr))
+#define readw(addr) (*(volatile unsigned short *) __io_virt(addr))
+#define readl(addr) (*(volatile unsigned int *) __io_virt(addr))
+
+#define writeb(b,addr) (*(volatile unsigned char *) __io_virt(addr) = (b))
+#define writew(b,addr) (*(volatile unsigned short *) __io_virt(addr) = (b))
+#define writel(b,addr) (*(volatile unsigned int *) __io_virt(addr) = (b))
+
+#define memset_io(a,b,c)        memset(__io_virt(a),(b),(c))
+#define memcpy_fromio(a,b,c)    memcpy((a),__io_virt(b),(c))
+#define memcpy_toio(a,b,c)      memcpy(__io_virt(a),(b),(c))
+
+#define inb_p(addr) readb(addr)
+#define inb(addr) readb(addr)
+
+#define outb(x,addr) ((void) writeb(x,addr))
+#define outb_p(x,addr) outb(x,addr)
+
+#endif /* __KERNEL__ */
+
+#endif