# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID 2fd3c0eb04eaeab3aa3c5d357e9b198e823b564c
# Parent b8aa9f40d67a5f94577957b9cc9578fd8e75fb53
[LINUX][X86/64] Support IO-port permissions bitmaps (ioperm() syscall).
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
xen-unstable changeset: 10288:28128dafbe03758434bc947002758edf60a2747e
xen-unstable date: Wed Jun 7 13:38:08 2006 +0100
---
linux-2.6-xen-sparse/arch/x86_64/kernel/ioport-xen.c | 59 ++++++++++++++++---
1 files changed, 51 insertions(+), 8 deletions(-)
diff -r b8aa9f40d67a -r 2fd3c0eb04ea
linux-2.6-xen-sparse/arch/x86_64/kernel/ioport-xen.c
--- a/linux-2.6-xen-sparse/arch/x86_64/kernel/ioport-xen.c Wed Jun 07
11:25:31 2006 +0100
+++ b/linux-2.6-xen-sparse/arch/x86_64/kernel/ioport-xen.c Wed Jun 07
13:39:07 2006 +0100
@@ -18,6 +18,57 @@
#include <linux/slab.h>
#include <linux/thread_info.h>
#include <xen/interface/physdev.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)
+{
+ struct thread_struct * t = ¤t->thread;
+ unsigned long *bitmap;
+ physdev_op_t op;
+
+ 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;
+
+ op.cmd = PHYSDEVOP_SET_IOBITMAP;
+ op.u.set_iobitmap.bitmap = (char *)bitmap;
+ op.u.set_iobitmap.nr_ports = IO_BITMAP_BITS;
+ HYPERVISOR_physdev_op(&op);
+ }
+
+ set_bitmap(t->io_bitmap_ptr, from, num, !turn_on);
+
+ return 0;
+}
/*
* sys_iopl has to be used when you want to access the IO ports
@@ -48,11 +99,3 @@ asmlinkage long sys_iopl(unsigned int ne
return 0;
}
-
-/*
- * this changes the io permissions bitmap in the current task.
- */
-asmlinkage long sys_ioperm(unsigned long from, unsigned long num, int turn_on)
-{
- return turn_on ? sys_iopl(3, NULL) : 0;
-}
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