Merge tag 'backlight-for-linus-3.16' of git://git.kernel.org/pub/scm/linux/kernel...

[cascardo/linux.git] / arch / arc / kernel / process.c

diff --git a/arch/arc/kernel/process.c b/arch/arc/kernel/process.c
index 07a3a96..fdd8971 100644 (file)
--- a/arch/arc/kernel/process.c
+++ b/arch/arc/kernel/process.c
@@ -150,6 +150,29 @@ int copy_thread(unsigned long clone_flags,
        return 0;
 }
 
+/*
+ * Do necessary setup to start up a new user task
+ */
+void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long usp)
+{
+       set_fs(USER_DS); /* user space */
+
+       regs->sp = usp;
+       regs->ret = pc;
+
+       /*
+        * [U]ser Mode bit set
+        * [L] ZOL loop inhibited to begin with - cleared by a LP insn
+        * Interrupts enabled
+        */
+       regs->status32 = STATUS_U_MASK | STATUS_L_MASK |
+                        STATUS_E1_MASK | STATUS_E2_MASK;
+
+       /* bogus seed values for debugging */
+       regs->lp_start = 0x10;
+       regs->lp_end = 0x80;
+}
+
 /*
  * Some archs flush debug and FPU info here
  */