[PATCH v2 2/2] target/riscv: csr: Implement mconfigptr CSR

[Rahul Pathak]

Signed-off-by: Rahul Pathak <rpathak@ventanamicro.com>
---
 target/riscv/cpu_bits.h |  1 +
 target/riscv/csr.c      | 19 +++++++++++++++----
 2 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/target/riscv/cpu_bits.h b/target/riscv/cpu_bits.h
index cffcd3a5df..e2f154b7c5 100644
--- a/target/riscv/cpu_bits.h
+++ b/target/riscv/cpu_bits.h
@@ -140,6 +140,7 @@
 #define CSR_MARCHID         0xf12
 #define CSR_MIMPID          0xf13
 #define CSR_MHARTID         0xf14
+#define CSR_MCONFIGPTR      0xf15 
 
 /* Machine Trap Setup */
 #define CSR_MSTATUS         0x300
diff --git a/target/riscv/csr.c b/target/riscv/csr.c
index 69e4d65fcd..2d7f608d49 100644
--- a/target/riscv/csr.c
+++ b/target/riscv/csr.c
@@ -209,6 +209,16 @@ static RISCVException epmp(CPURISCVState *env, int csrno)
 
     return RISCV_EXCP_ILLEGAL_INST;
 }
+
+static RISCVException priv1p12(CPURISCVState *env, int csrno)
+{
+       if (env->priv_ver >= PRIV_VERSION_1_12_0) {
+               return RISCV_EXCP_NONE;
+       }
+
+       return RISCV_EXCP_ILLEGAL_INST;
+}
+
 #endif
 
 /* User Floating-Point CSRs */
@@ -1569,10 +1579,11 @@ riscv_csr_operations csr_ops[CSR_TABLE_SIZE] = {
     [CSR_MINSTRETH] = { "minstreth", any32, read_instreth },
 
     /* Machine Information Registers */
-    [CSR_MVENDORID] = { "mvendorid", any,   read_zero    },
-    [CSR_MARCHID]   = { "marchid",   any,   read_zero    },
-    [CSR_MIMPID]    = { "mimpid",    any,   read_zero    },
-    [CSR_MHARTID]   = { "mhartid",   any,   read_mhartid },
+    [CSR_MVENDORID] = { "mvendorid",   any,            read_zero    },
+    [CSR_MARCHID]   = { "marchid",     any,            read_zero    },
+    [CSR_MIMPID]    = { "mimpid",      any,            read_zero    },
+    [CSR_MHARTID]   = { "mhartid",     any,            read_mhartid },
+    [CSR_MCONFIGPTR] = {"mconfigptr",  priv1p12,       read_zero    },
 
     /* Machine Trap Setup */
     [CSR_MSTATUS]     = { "mstatus",    any,   read_mstatus,     write_mstatus 
    },
-- 
2.25.1