ASR_BASE
Change-Id: Icf3719cc0afe3eeb3edc7fa80a2eb5199ca9dda1
diff --git a/marvell/linux/arch/x86/kernel/ioport.c b/marvell/linux/arch/x86/kernel/ioport.c
new file mode 100644
index 0000000..61a89d3
--- /dev/null
+++ b/marvell/linux/arch/x86/kernel/ioport.c
@@ -0,0 +1,141 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * This contains the io-permission bitmap code - written by obz, with changes
+ * by Linus. 32/64 bits code unification by Miguel Botón.
+ */
+
+#include <linux/sched.h>
+#include <linux/sched/task_stack.h>
+#include <linux/kernel.h>
+#include <linux/capability.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/ioport.h>
+#include <linux/security.h>
+#include <linux/smp.h>
+#include <linux/stddef.h>
+#include <linux/slab.h>
+#include <linux/thread_info.h>
+#include <linux/syscalls.h>
+#include <linux/bitmap.h>
+#include <asm/syscalls.h>
+#include <asm/desc.h>
+
+/*
+ * this changes the io permissions bitmap in the current task.
+ */
+long ksys_ioperm(unsigned long from, unsigned long num, int turn_on)
+{
+ struct thread_struct *t = ¤t->thread;
+ struct tss_struct *tss;
+ unsigned int i, max_long, bytes, bytes_updated;
+
+ if ((from + num <= from) || (from + num > IO_BITMAP_BITS))
+ return -EINVAL;
+ if (turn_on && (!capable(CAP_SYS_RAWIO) ||
+ security_locked_down(LOCKDOWN_IOPORT)))
+ 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) {
+ unsigned long *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);
+
+ /*
+ * Now that we have an IO bitmap, we need our TSS limit to be
+ * correct. It's fine if we are preempted after doing this:
+ * with TIF_IO_BITMAP set, context switches will keep our TSS
+ * limit correct.
+ */
+ preempt_disable();
+ refresh_tss_limit();
+ preempt_enable();
+ }
+
+ /*
+ * 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(cpu_tss_rw, get_cpu());
+
+ if (turn_on)
+ bitmap_clear(t->io_bitmap_ptr, from, num);
+ else
+ bitmap_set(t->io_bitmap_ptr, from, num);
+
+ /*
+ * 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(unsigned 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;
+}
+
+SYSCALL_DEFINE3(ioperm, unsigned long, from, unsigned long, num, int, turn_on)
+{
+ return ksys_ioperm(from, num, turn_on);
+}
+
+/*
+ * 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 flags 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.
+ */
+SYSCALL_DEFINE1(iopl, unsigned int, level)
+{
+ struct pt_regs *regs = current_pt_regs();
+ struct thread_struct *t = ¤t->thread;
+
+ /*
+ * Careful: the IOPL bits in regs->flags are undefined under Xen PV
+ * and changing them has no effect.
+ */
+ unsigned int old = t->iopl >> X86_EFLAGS_IOPL_BIT;
+
+ if (level > 3)
+ return -EINVAL;
+ /* Trying to gain more privileges? */
+ if (level > old) {
+ if (!capable(CAP_SYS_RAWIO) ||
+ security_locked_down(LOCKDOWN_IOPORT))
+ return -EPERM;
+ }
+ regs->flags = (regs->flags & ~X86_EFLAGS_IOPL) |
+ (level << X86_EFLAGS_IOPL_BIT);
+ t->iopl = level << X86_EFLAGS_IOPL_BIT;
+ set_iopl_mask(t->iopl);
+
+ return 0;
+}