i386: prepare shared kernel/ioport.c

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 0 insertions, 153 deletions

diff --git a/arch/i386/kernel/ioport.c b/arch/i386/kernel/ioport.c
deleted file mode 100644
index 3d310a946d76..000000000000
--- a/arch/i386/kernel/ioport.c
+++ /dev/null
@@ -1,153 +0,0 @@
-/*
- *	linux/arch/i386/kernel/ioport.c
- *
- * This contains the io-permission bitmap code - written by obz, with changes
- * by Linus.
- */
-
-#include <linux/sched.h>
-#include <linux/kernel.h>
-#include <linux/capability.h>
-#include <linux/errno.h>
-#include <linux/types.h>
-#include <linux/ioport.h>
-#include <linux/smp.h>
-#include <linux/stddef.h>
-#include <linux/slab.h>
-#include <linux/thread_info.h>
-#include <linux/syscalls.h>
-
-/* Set EXTENT bits starting at BASE in BITMAP to value TURN_ON. */
-static void set_bitmap(unsigned long *bitmap, unsigned int base, unsigned int extent, int new_value)
-{
-	unsigned long mask;
-	unsigned long *bitmap_base = bitmap + (base / BITS_PER_LONG);
-	unsigned int low_index = base & (BITS_PER_LONG-1);
-	int length = low_index + extent;
-
-	if (low_index != 0) {
-		mask = (~0UL << low_index);
-		if (length < BITS_PER_LONG)
-			mask &= ~(~0UL << length);
-		if (new_value)
-			*bitmap_base++ |= mask;
-		else
-			*bitmap_base++ &= ~mask;
-		length -= BITS_PER_LONG;
-	}
-
-	mask = (new_value ? ~0UL : 0UL);
-	while (length >= BITS_PER_LONG) {
-		*bitmap_base++ = mask;
-		length -= BITS_PER_LONG;
-	}
-
-	if (length > 0) {
-		mask = ~(~0UL << length);
-		if (new_value)
-			*bitmap_base++ |= mask;
-		else
-			*bitmap_base++ &= ~mask;
-	}
-}
-
-
-/*
- * this changes the io permissions bitmap in the current task.
- */
-asmlinkage long sys_ioperm(unsigned long from, unsigned long num, int turn_on)
-{
-	unsigned long i, max_long, bytes, bytes_updated;
-	struct thread_struct * t = &current->thread;
-	struct tss_struct * tss;
-	unsigned long *bitmap;
-
-	if ((from + num <= from) || (from + num > IO_BITMAP_BITS))
-		return -EINVAL;
-	if (turn_on && !capable(CAP_SYS_RAWIO))
-		return -EPERM;
-
-	/*
-	 * If it's the first ioperm() call in this thread's lifetime, set the
-	 * IO bitmap up. ioperm() is much less timing critical than clone(),
-	 * this is why we delay this operation until now:
-	 */
-	if (!t->io_bitmap_ptr) {
-		bitmap = kmalloc(IO_BITMAP_BYTES, GFP_KERNEL);
-		if (!bitmap)
-			return -ENOMEM;
-
-		memset(bitmap, 0xff, IO_BITMAP_BYTES);
-		t->io_bitmap_ptr = bitmap;
-		set_thread_flag(TIF_IO_BITMAP);
-	}
-
-	/*
-	 * do it in the per-thread copy and in the TSS ...
-	 *
-	 * Disable preemption via get_cpu() - we must not switch away
-	 * because the ->io_bitmap_max value must match the bitmap
-	 * contents:
-	 */
-	tss = &per_cpu(init_tss, get_cpu());
-
-	set_bitmap(t->io_bitmap_ptr, from, num, !turn_on);
-
-	/*
-	 * Search for a (possibly new) maximum. This is simple and stupid,
-	 * to keep it obviously correct:
-	 */
-	max_long = 0;
-	for (i = 0; i < IO_BITMAP_LONGS; i++)
-		if (t->io_bitmap_ptr[i] != ~0UL)
-			max_long = i;
-
-	bytes = (max_long + 1) * sizeof(long);
-	bytes_updated = max(bytes, t->io_bitmap_max);
-
-	t->io_bitmap_max = bytes;
-
-	/*
-	 * Sets the lazy trigger so that the next I/O operation will
-	 * reload the correct bitmap.
-	 * Reset the owner so that a process switch will not set
-	 * tss->io_bitmap_base to IO_BITMAP_OFFSET.
-	 */
-	tss->x86_tss.io_bitmap_base = INVALID_IO_BITMAP_OFFSET_LAZY;
-	tss->io_bitmap_owner = NULL;
-
-	put_cpu();
-
-	return 0;
-}
-
-/*
- * 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 long sys_iopl(unsigned long unused)
-{
-	volatile struct pt_regs * regs = (struct pt_regs *) &unused;
-	unsigned int level = regs->ebx;
-	unsigned int old = (regs->eflags >> 12) & 3;
-	struct thread_struct *t = &current->thread;
-
-	if (level > 3)
-		return -EINVAL;
-	/* Trying to gain more privileges? */
-	if (level > old) {
-		if (!capable(CAP_SYS_RAWIO))
-			return -EPERM;
-	}
-	t->iopl = level << 12;
-	regs->eflags = (regs->eflags & ~X86_EFLAGS_IOPL) | t->iopl;
-	set_iopl_mask(t->iopl);
-	return 0;
-}