patch-2.1.121 linux/arch/arm/kernel/ioport.c

• Lines: 102
• Date: Sun Sep 6 10:44:47 1998
• Orig file: v2.1.120/linux/arch/arm/kernel/ioport.c
• Orig date: Thu May 7 22:51:46 1998

diff -u --recursive --new-file v2.1.120/linux/arch/arm/kernel/ioport.c linux/arch/arm/kernel/ioport.c
@@ -1,10 +1,7 @@
 /*
  * linux/arch/arm/kernel/ioport.c
  *
- * This contains the io-permission bitmap code - written by obz, with changes
- * by Linus.
- *
- * Modifications for ARM processor Copyright (C) 1995, 1996 Russell King
+ * Io-port support is not used for ARM
  */
 
 #include <linux/sched.h>
@@ -14,85 +11,19 @@
 #include <linux/ioport.h>
 
 /* Set EXTENT bits starting at BASE in BITMAP to value TURN_ON. */
-asmlinkage void set_bitmap(unsigned long *bitmap, short base, short extent, int new_value)
+/*asmlinkage void set_bitmap(unsigned long *bitmap, short base, short extent, int new_value)
 {
-	int mask;
-	unsigned long *bitmap_base = bitmap + (base >> 5);
-	unsigned short low_index = base & 0x1f;
-	int length = low_index + extent;
+}*/
 
-	if (low_index != 0) {
-		mask = (~0 << low_index);
-		if (length < 32)
-				mask &= ~(~0 << length);
-		if (new_value)
-			*bitmap_base++ |= mask;
-		else
-			*bitmap_base++ &= ~mask;
-		length -= 32;
-	}
-
-	mask = (new_value ? ~0 : 0);
-	while (length >= 32) {
-		*bitmap_base++ = mask;
-		length -= 32;
-	}
-
-	if (length > 0) {
-		mask = ~(~0 << length);
-		if (new_value)
-			*bitmap_base++ |= mask;
-		else
-			*bitmap_base++ &= ~mask;
-	}
-}
-
-/*
- * this changes the io permissions bitmap in the current task.
- */
 asmlinkage int sys_ioperm(unsigned long from, unsigned long num, int turn_on)
 {
-	if (from + num <= from)
-		return -EINVAL;
-#ifndef __arm__
-	if (from + num > IO_BITMAP_SIZE*32)
-		return -EINVAL;
-#endif
-	if (!capable(CAP_SYS_RAWIO))
-		return -EPERM;
-
-#ifdef IODEBUG
-	printk("io: from=%d num=%d %s\n", from, num, (turn_on ? "on" : "off"));
-#endif
-#ifndef __arm__
-	set_bitmap((unsigned long *)current->tss.io_bitmap, from, num, !turn_on);
-#endif
-	return 0;
+	return -ENOSYS;
 }
 
-unsigned int *stack;
-
-/*
- * sys_iopl has to be used when you want to access the IO ports
- * beyond the 0x3ff range: to get the full 65536 ports bitmapped
- * you'd need 8kB of bitmaps/process, which is a bit excessive.
- *
- * Here we just change the eflags value on the stack: we allow
- * only the super-user to do it. This depends on the stack-layout
- * on system-call entry - see also fork() and the signal handling
- * code.
- */
 asmlinkage int sys_iopl(long ebx,long ecx,long edx,
 	     long esi, long edi, long ebp, long eax, long ds,
 	     long es, long fs, long gs, long orig_eax,
 	     long eip,long cs,long eflags,long esp,long ss)
 {
-	unsigned int level = ebx;
-
-	if (level > 3)
-		return -EINVAL;
-	if (!capable(CAP_SYS_RAWIO))
-		return -EPERM;
-	*(&eflags) = (eflags & 0xffffcfff) | (level << 12);
-	return 0;
+	return -ENOSYS;
 }