MIPS: Add accessor & bit definitions for GlobalNumber

MIPSr6 introduces a GlobalNumber register, which is required when VPs
are implemented (ie. when multi-threading is supported) but otherwise
optional. The register contains sufficient information to uniquely
identify a VP within a system using its cluster number, core number & VP
ID.

In preparation for using this register & its fields, introduce an
accessor macro for it & define its various bits with the typical style
preprocessor macros.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/17007/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --git a/arch/mips/include/asm/mipsregs.h b/arch/mips/include/asm/mipsregs.h
index dbb0ece..e4ed1bc 100644 (file)
--- a/arch/mips/include/asm/mipsregs.h
+++ b/arch/mips/include/asm/mipsregs.h
@@ -48,6 +48,7 @@
 #define CP0_ENTRYLO0 $2
 #define CP0_ENTRYLO1 $3
 #define CP0_CONF $3
+#define CP0_GLOBALNUMBER $3, 1
 #define CP0_CONTEXT $4
 #define CP0_PAGEMASK $5
 #define CP0_SEGCTL0 $5, 2
@@ -148,6 +149,16 @@
 #define MIPS_ENTRYLO_RI                (_ULCAST_(1) << (BITS_PER_LONG - 1))
 
 /*
+ * MIPSr6+ GlobalNumber register definitions
+ */
+#define MIPS_GLOBALNUMBER_VP_SHF       0
+#define MIPS_GLOBALNUMBER_VP           (_ULCAST_(0xff) << MIPS_GLOBALNUMBER_VP_SHF)
+#define MIPS_GLOBALNUMBER_CORE_SHF     8
+#define MIPS_GLOBALNUMBER_CORE         (_ULCAST_(0xff) << MIPS_GLOBALNUMBER_CORE_SHF)
+#define MIPS_GLOBALNUMBER_CLUSTER_SHF  16
+#define MIPS_GLOBALNUMBER_CLUSTER      (_ULCAST_(0xf) << MIPS_GLOBALNUMBER_CLUSTER_SHF)
+
+/*
  * Values for PageMask register
  */
 #ifdef CONFIG_CPU_VR41XX
@@ -1446,6 +1457,8 @@ do {                                                                      \
 #define read_c0_conf()         __read_32bit_c0_register($3, 0)
 #define write_c0_conf(val)     __write_32bit_c0_register($3, 0, val)
 
+#define read_c0_globalnumber() __read_32bit_c0_register($3, 1)
+
 #define read_c0_context()      __read_ulong_c0_register($4, 0)
 #define write_c0_context(val)  __write_ulong_c0_register($4, 0, val)