MIPS: spaces: Define a couple of handy macros

Define CKSEGX_SIZE to represent the size of each KSEG segment.

Introduce CKSEG0ADDR_OR_64BIT and CKSEG1ADDR_OR_64BIT to get an XPHYS
address in 64bits and CKSEG[01]ADDR() in 32 bits mode.

Co-developed-by: Jiaxun Yang <[e-mail]>
Signed-off-by: Gregory CLEMENT <[e-mail]>
Signed-off-by: Thomas Bogendoerfer <[e-mail]>

arch/mips/include/asm/addrspace.h

···
 #define KSEGX(a)		((_ACAST32_(a)) & _ACAST32_(0xe0000000))
 
 /*
+ * Gives the size of each kernel segment
+ */
+#define CSEGX_SIZE		0x20000000
+
+/*
  * Returns the physical address of a CKSEGx / XKPHYS address
  */
 #define CPHYSADDR(a)		((_ACAST32_(a)) & 0x1fffffff)

arch/mips/include/asm/mach-generic/spaces.h

···
 #define HIGHMEM_START		_AC(0x20000000, UL)
 #endif
 
+#define CKSEG0ADDR_OR_64BIT(x)	CKSEG0ADDR(x)
+#define CKSEG1ADDR_OR_64BIT(x)	CKSEG1ADDR(x)
 #endif /* CONFIG_32BIT */
 
 #ifdef CONFIG_64BIT
···
 #define TO_CAC(x)		(CAC_BASE   | ((x) & TO_PHYS_MASK))
 #define TO_UNCAC(x)		(UNCAC_BASE | ((x) & TO_PHYS_MASK))
 
+#define CKSEG0ADDR_OR_64BIT(x)	TO_CAC(x)
+#define CKSEG1ADDR_OR_64BIT(x)	TO_UNCAC(x)
 #endif /* CONFIG_64BIT */
 
 /*