Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=d4c3a41e9a1f72bb995a6fb89ad028eda9a14c3d
Commit:     d4c3a41e9a1f72bb995a6fb89ad028eda9a14c3d
Parent:     549c64ac41fd37236543143a4e92699958a3972e
Author:     Thomas Gleixner <[EMAIL PROTECTED]>
AuthorDate: Thu Oct 11 11:12:29 2007 +0200
Committer:  Thomas Gleixner <[EMAIL PROTECTED]>
CommitDate: Thu Oct 11 11:12:29 2007 +0200

    i386: prepare shared kernel/ioport.c
    
    Signed-off-by: Thomas Gleixner <[EMAIL PROTECTED]>
    Signed-off-by: Ingo Molnar <[EMAIL PROTECTED]>
---
 arch/i386/kernel/Makefile    |    2 +-
 arch/i386/kernel/ioport.c    |  153 ------------------------------------------
 arch/i386/kernel/ioport_32.c |  153 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 154 insertions(+), 154 deletions(-)

diff --git a/arch/i386/kernel/Makefile b/arch/i386/kernel/Makefile
index a832c41..38d2b46 100644
--- a/arch/i386/kernel/Makefile
+++ b/arch/i386/kernel/Makefile
@@ -5,7 +5,7 @@
 extra-y := head.o init_task.o vmlinux.lds
 
 obj-y  := process.o signal.o entry.o traps_32.o irq.o \
-               ptrace.o time.o ioport.o ldt.o setup_32.o i8259_32.o 
sys_i386_32.o \
+               ptrace.o time.o ioport_32.o ldt.o setup_32.o i8259_32.o 
sys_i386_32.o \
                pci-dma_32.o i386_ksyms.o i387.o bootflag.o e820_32.o\
                quirks.o i8237.o topology.o alternative.o i8253_32.o tsc.o
 
diff --git a/arch/i386/kernel/ioport.c b/arch/i386/kernel/ioport.c
deleted file mode 100644
index 3d310a9..0000000
--- 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;
-}
diff --git a/arch/i386/kernel/ioport_32.c b/arch/i386/kernel/ioport_32.c
new file mode 100644
index 0000000..3d310a9
--- /dev/null
+++ b/arch/i386/kernel/ioport_32.c
@@ -0,0 +1,153 @@
+/*
+ *     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;
+}
-
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