Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / s390 / kernel / sys_s390.c

diff --git a/kernel/arch/s390/kernel/sys_s390.c b/kernel/arch/s390/kernel/sys_s390.c
new file mode 100644 (file)
index 0000000..f145490
--- /dev/null
+++ b/kernel/arch/s390/kernel/sys_s390.c
@@ -0,0 +1,91 @@
+/*
+ *  S390 version
+ *    Copyright IBM Corp. 1999, 2000
+ *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
+ *               Thomas Spatzier (tspat@de.ibm.com)
+ *
+ *  Derived from "arch/i386/kernel/sys_i386.c"
+ *
+ *  This file contains various random system calls that
+ *  have a non-standard calling sequence on the Linux/s390
+ *  platform.
+ */
+
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/fs.h>
+#include <linux/smp.h>
+#include <linux/sem.h>
+#include <linux/msg.h>
+#include <linux/shm.h>
+#include <linux/stat.h>
+#include <linux/syscalls.h>
+#include <linux/mman.h>
+#include <linux/file.h>
+#include <linux/utsname.h>
+#include <linux/personality.h>
+#include <linux/unistd.h>
+#include <linux/ipc.h>
+#include <asm/uaccess.h>
+#include "entry.h"
+
+/*
+ * Perform the mmap() system call. Linux for S/390 isn't able to handle more
+ * than 5 system call parameters, so this system call uses a memory block
+ * for parameter passing.
+ */
+
+struct s390_mmap_arg_struct {
+       unsigned long addr;
+       unsigned long len;
+       unsigned long prot;
+       unsigned long flags;
+       unsigned long fd;
+       unsigned long offset;
+};
+
+SYSCALL_DEFINE1(mmap2, struct s390_mmap_arg_struct __user *, arg)
+{
+       struct s390_mmap_arg_struct a;
+       int error = -EFAULT;
+
+       if (copy_from_user(&a, arg, sizeof(a)))
+               goto out;
+       error = sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
+out:
+       return error;
+}
+
+/*
+ * sys_ipc() is the de-multiplexer for the SysV IPC calls.
+ */
+SYSCALL_DEFINE5(s390_ipc, uint, call, int, first, unsigned long, second,
+               unsigned long, third, void __user *, ptr)
+{
+       if (call >> 16)
+               return -EINVAL;
+       /* The s390 sys_ipc variant has only five parameters instead of six
+        * like the generic variant. The only difference is the handling of
+        * the SEMTIMEDOP subcall where on s390 the third parameter is used
+        * as a pointer to a struct timespec where the generic variant uses
+        * the fifth parameter.
+        * Therefore we can call the generic variant by simply passing the
+        * third parameter also as fifth parameter.
+        */
+       return sys_ipc(call, first, second, third, ptr, third);
+}
+
+SYSCALL_DEFINE1(s390_personality, unsigned int, personality)
+{
+       unsigned int ret;
+
+       if (personality(current->personality) == PER_LINUX32 &&
+           personality(personality) == PER_LINUX)
+               personality |= PER_LINUX32;
+       ret = sys_personality(personality);
+       if (personality(ret) == PER_LINUX32)
+               ret &= ~PER_LINUX32;
+
+       return ret;
+}