From 2cf08fa82161bf398c1a6321d738a45730b0acd2 Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@linutronix.de>
Date: Thu, 11 Oct 2007 11:14:34 +0200
Subject: x86_64: prepare shared kernel/ioport.c

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
 arch/x86_64/kernel/Makefile    |   2 +-
 arch/x86_64/kernel/ioport.c    | 119 -----------------------------------------
 arch/x86_64/kernel/ioport_64.c | 119 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 120 insertions(+), 120 deletions(-)
 delete mode 100644 arch/x86_64/kernel/ioport.c
 create mode 100644 arch/x86_64/kernel/ioport_64.c

(limited to 'arch/x86_64/kernel')

diff --git a/arch/x86_64/kernel/Makefile b/arch/x86_64/kernel/Makefile
index a5ff38d5097c..7918fee8b9b3 100644
--- a/arch/x86_64/kernel/Makefile
+++ b/arch/x86_64/kernel/Makefile
@@ -5,7 +5,7 @@
 extra-y 	:= head.o head64.o init_task.o vmlinux.lds
 EXTRA_AFLAGS	:= -traditional
 obj-y	:= process.o signal.o entry.o traps_64.o irq.o \
-		ptrace.o time.o ioport.o ldt.o setup_64.o i8259_64.o sys_x86_64.o \
+		ptrace.o time.o ioport_64.o ldt.o setup_64.o i8259_64.o sys_x86_64.o \
 		x8664_ksyms.o i387.o syscall.o vsyscall_64.o \
 		setup64.o bootflag.o e820_64.o reboot.o quirks.o i8237.o \
 		pci-dma_64.o pci-nommu.o alternative.o hpet_64.o tsc.o bugs.o \
diff --git a/arch/x86_64/kernel/ioport.c b/arch/x86_64/kernel/ioport.c
deleted file mode 100644
index 653efa30b0f4..000000000000
--- a/arch/x86_64/kernel/ioport.c
+++ /dev/null
@@ -1,119 +0,0 @@
-/*
- *	linux/arch/x86_64/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)
-{
-	int i;
-		if (new_value)
-		for (i = base; i < base + extent; i++) 
-			__set_bit(i, bitmap); 
-		else
-		for (i = base; i < base + extent; i++) 
-			clear_bit(i, bitmap); 
-}
-
-/*
- * this changes the io permissions bitmap in the current task.
- */
-asmlinkage long sys_ioperm(unsigned long from, unsigned long num, int turn_on)
-{
-	unsigned int 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;
-
-	/* Update the TSS: */
-	memcpy(tss->io_bitmap, t->io_bitmap_ptr, bytes_updated);
-
-	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 int level, struct pt_regs *regs)
-{
-	unsigned int old = (regs->eflags >> 12) & 3;
-
-	if (level > 3)
-		return -EINVAL;
-	/* Trying to gain more privileges? */
-	if (level > old) {
-		if (!capable(CAP_SYS_RAWIO))
-			return -EPERM;
-	}
-	regs->eflags = (regs->eflags &~ X86_EFLAGS_IOPL) | (level << 12);
-	return 0;
-}
diff --git a/arch/x86_64/kernel/ioport_64.c b/arch/x86_64/kernel/ioport_64.c
new file mode 100644
index 000000000000..653efa30b0f4
--- /dev/null
+++ b/arch/x86_64/kernel/ioport_64.c
@@ -0,0 +1,119 @@
+/*
+ *	linux/arch/x86_64/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)
+{
+	int i;
+		if (new_value)
+		for (i = base; i < base + extent; i++) 
+			__set_bit(i, bitmap); 
+		else
+		for (i = base; i < base + extent; i++) 
+			clear_bit(i, bitmap); 
+}
+
+/*
+ * this changes the io permissions bitmap in the current task.
+ */
+asmlinkage long sys_ioperm(unsigned long from, unsigned long num, int turn_on)
+{
+	unsigned int 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;
+
+	/* Update the TSS: */
+	memcpy(tss->io_bitmap, t->io_bitmap_ptr, bytes_updated);
+
+	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 int level, struct pt_regs *regs)
+{
+	unsigned int old = (regs->eflags >> 12) & 3;
+
+	if (level > 3)
+		return -EINVAL;
+	/* Trying to gain more privileges? */
+	if (level > old) {
+		if (!capable(CAP_SYS_RAWIO))
+			return -EPERM;
+	}
+	regs->eflags = (regs->eflags &~ X86_EFLAGS_IOPL) | (level << 12);
+	return 0;
+}
-- 
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