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
+++ /dev/null
-/*
- * 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 = ¤t->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 = ¤t->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;
-}
--- /dev/null
+/*
+ * 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 = ¤t->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 = ¤t->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;
+}
projects / deliverable / linux.git / commitdiff
