+/* Added functions for PREM support */
+
+/*
+ * Disable IRQ syscall (__NR_prem_irq_disable)
+ */
+asmlinkage long sys_prem_irq_disable(void)
+{
+ /* We need to update userspace pstate that is going to be recovered.
+ * If we call any system call, the irq enabled on OS level */
+ struct pt_regs * regs = task_pt_regs(current);
+ regs->pstate |= (PSR_I_BIT | PSR_F_BIT);
+ return 0;
+}
+
+/*
+ * Enable IRQ syscall (__NR_prem_irq_enable)
+ */
+asmlinkage long sys_prem_irq_enable(void)
+{
+ struct pt_regs * regs = task_pt_regs(current);
+ regs->pstate &= ~(PSR_I_BIT | PSR_F_BIT);
+ return 0;
+}
+
+extern void __flush_dcache_all(void);
+
+/*
+ * Flush and invalidate entire cache (__NR_prem_flush)
+ */
+asmlinkage long sys_prem_flush(void)
+{
+ __flush_dcache_all();
+ return 0;
+}
+