Provide functions to access cop0 config4-7 registers

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

include/asm-mips/mipsregs.h

@@ -790,10 +790,18 @@ do {									\
 #define read_c0_config1()	__read_32bit_c0_register($16, 1)
 #define read_c0_config2()	__read_32bit_c0_register($16, 2)
 #define read_c0_config3()	__read_32bit_c0_register($16, 3)
+#define read_c0_config4()	__read_32bit_c0_register($16, 4)
+#define read_c0_config5()	__read_32bit_c0_register($16, 5)
+#define read_c0_config6()	__read_32bit_c0_register($16, 6)
+#define read_c0_config7()	__read_32bit_c0_register($16, 7)
 #define write_c0_config(val)	__write_32bit_c0_register($16, 0, val)
 #define write_c0_config1(val)	__write_32bit_c0_register($16, 1, val)
 #define write_c0_config2(val)	__write_32bit_c0_register($16, 2, val)
 #define write_c0_config3(val)	__write_32bit_c0_register($16, 3, val)
+#define write_c0_config4(val)	__write_32bit_c0_register($16, 4, val)
+#define write_c0_config5(val)	__write_32bit_c0_register($16, 5, val)
+#define write_c0_config6(val)	__write_32bit_c0_register($16, 6, val)
+#define write_c0_config7(val)	__write_32bit_c0_register($16, 7, val)
 
 /*
  * The WatchLo register.  There may be upto 8 of them.