--- zzzz-none-000/linux-2.4.17/arch/mips/kernel/syscall.c	2001-07-02 20:56:40.000000000 +0000
+++ sangam-fb-322/linux-2.4.17/arch/mips/kernel/syscall.c	2004-11-24 13:22:35.000000000 +0000
@@ -31,6 +31,10 @@
 #include <asm/stackframe.h>
 #include <asm/uaccess.h>
 
+#ifdef CONFIG_TI_CUSTOM_SYS_CALLS
+#include <linux/tisyscust.h>
+#endif
+
 extern asmlinkage void syscall_trace(void);
 typedef asmlinkage int (*syscall_t)(void *a0,...);
 extern asmlinkage int (*do_syscalls)(struct pt_regs *regs, syscall_t fun,
@@ -82,7 +86,16 @@
 asmlinkage unsigned long old_mmap(unsigned long addr, size_t len, int prot,
                                   int flags, int fd, off_t offset)
 {
-	return do_mmap2(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
+	int result;
+
+	result = -EINVAL;
+	if (offset & ~PAGE_MASK)
+		goto out;
+
+	result = do_mmap2(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
+
+out:
+	return result;
 }
 
 asmlinkage long
@@ -174,6 +187,30 @@
 	return error;
 }
 
+
+#ifdef CONFIG_TI_CUSTOM_SYS_CALLS
+/*
+  MIPS has no standard implementation of syscall. In order to provide custom
+  syscall the ti_syscall function is implemented here
+*/
+ti_syscall_t ti_syscalls[NR_TI_SYSCALLS];
+
+asmlinkage int sys_ti_custom(int nfunc, void* param, int *ret_val)
+{
+
+  if ((nfunc < 0)||(nfunc >= NR_TI_SYSCALLS))
+    return -ENOSYS;
+
+  if (ti_syscalls[nfunc] == NULL)
+    return -ENOSYS;
+
+  *ret_val = (ti_syscalls[nfunc])(param);
+
+  return *ret_val;
+}
+#endif
+
+
 /*
  * Do the indirect syscall syscall.
  * Don't care about kernel locking; the actual syscall will do it.