[PATCH 1/3] target/riscv: Add infrastructure for 'B' MISA extension

[Rob Bradford]

Add the infrastructure for the 'B' extension which is the union of the
Zba, Zbb and Zbs instructions.

Signed-off-by: Rob Bradford <rbradford@rivosinc.com>
---
 target/riscv/cpu.c         | 5 +++--
 target/riscv/cpu.h         | 1 +
 target/riscv/tcg/tcg-cpu.c | 1 +
 3 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
index b07a76ef6b..22f8e527ff 100644
--- a/target/riscv/cpu.c
+++ b/target/riscv/cpu.c
@@ -38,9 +38,9 @@
 #include "tcg/tcg.h"
 
 /* RISC-V CPU definitions */
-static const char riscv_single_letter_exts[] = "IEMAFDQCPVH";
+static const char riscv_single_letter_exts[] = "IEMAFDQCBPVH";
 const uint32_t misa_bits[] = {RVI, RVE, RVM, RVA, RVF, RVD, RVV,
-                              RVC, RVS, RVU, RVH, RVJ, RVG, 0};
+                              RVC, RVS, RVU, RVH, RVJ, RVG, RVB, 0};
 
 /*
  * From vector_helper.c
@@ -1251,6 +1251,7 @@ static const MISAExtInfo misa_ext_info_arr[] = {
     MISA_EXT_INFO(RVJ, "x-j", "Dynamic translated languages"),
     MISA_EXT_INFO(RVV, "v", "Vector operations"),
     MISA_EXT_INFO(RVG, "g", "General purpose (IMAFD_Zicsr_Zifencei)"),
+    MISA_EXT_INFO(RVB, "x-b", "Bit manipulation (Zba_Zbb_Zbs)")
 };
 
 static int riscv_validate_misa_info_idx(uint32_t bit)
diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h
index 2725528bb5..756a345513 100644
--- a/target/riscv/cpu.h
+++ b/target/riscv/cpu.h
@@ -69,6 +69,7 @@ typedef struct CPUArchState CPURISCVState;
 #define RVH RV('H')
 #define RVJ RV('J')
 #define RVG RV('G')
+#define RVB RV('B')
 
 extern const uint32_t misa_bits[];
 const char *riscv_get_misa_ext_name(uint32_t bit);
diff --git a/target/riscv/tcg/tcg-cpu.c b/target/riscv/tcg/tcg-cpu.c
index 8a35683a34..fda54671d5 100644
--- a/target/riscv/tcg/tcg-cpu.c
+++ b/target/riscv/tcg/tcg-cpu.c
@@ -791,6 +791,7 @@ static const RISCVCPUMisaExtConfig misa_ext_cfgs[] = {
     MISA_CFG(RVJ, false),
     MISA_CFG(RVV, false),
     MISA_CFG(RVG, false),
+    MISA_CFG(RVB, false)
 };
 
 /*
-- 
2.43.0