MIPS: define MAAR register accessors & bits

Add accessor macros for the Memory Accessibility Attribute Registers
(MAARs), the bits contained within the MAARs & the Config5.MRP bit
indicating their presence. The only current use of the MAARs is to
enable speculative accesses to regions of memory. Besides the potential
performance benefits of speculative accesses, they are a requirement
for the P5600 core to handle non-128b-aligned MSA vector loads & stores
rather than generating an address error.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/7329/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 12 insertions, 0 deletions

diff --git a/arch/mips/include/asm/mipsregs.h b/arch/mips/include/asm/mipsregs.h
index 9775c1aba4d3..f7e092befe14 100644
--- a/arch/mips/include/asm/mipsregs.h
+++ b/arch/mips/include/asm/mipsregs.h
@@ -653,6 +653,7 @@
 
 #define MIPS_CONF5_NF           (_ULCAST_(1) << 0)
 #define MIPS_CONF5_UFR          (_ULCAST_(1) << 2)
+#define MIPS_CONF5_MRP          (_ULCAST_(1) << 3)
 #define MIPS_CONF5_MSAEN        (_ULCAST_(1) << 27)
 #define MIPS_CONF5_EVA          (_ULCAST_(1) << 28)
 #define MIPS_CONF5_CV           (_ULCAST_(1) << 29)
@@ -669,6 +670,12 @@
 #define MIPS_CONF7_IAR          (_ULCAST_(1) << 10)
 #define MIPS_CONF7_AR           (_ULCAST_(1) << 16)
 
+/* MAAR bit definitions */
+#define MIPS_MAAR_ADDR          ((BIT_ULL(BITS_PER_LONG - 12) - 1) << 12)
+#define MIPS_MAAR_ADDR_SHIFT    12
+#define MIPS_MAAR_S             (_ULCAST_(1) << 1)
+#define MIPS_MAAR_V             (_ULCAST_(1) << 0)
+
 /*  EntryHI bit definition */
 #define MIPS_ENTRYHI_EHINV      (_ULCAST_(1) << 10)
 
@@ -1076,6 +1083,11 @@ do {									\
 #define write_c0_config6(val)   __write_32bit_c0_register($16, 6, val)
 #define write_c0_config7(val)   __write_32bit_c0_register($16, 7, val)
 
+#define read_c0_maar()          __read_ulong_c0_register($17, 1)
+#define write_c0_maar(val)      __write_ulong_c0_register($17, 1, val)
+#define read_c0_maari()         __read_32bit_c0_register($17, 2)
+#define write_c0_maari(val)     __write_32bit_c0_register($17, 2, val)
+
 /*
  * The WatchLo register.  There may be up to 8 of them.
  */