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

[Rahul Pathak]

mconfigptr is an mandatory CSR as per the priv spec.
This csr holds the physical address of the configuration
data structure if this data structure is implemented
Its an readonly csr set to zero making configuration
data structure not supported.

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

diff --git a/target/riscv/cpu_bits.h b/target/riscv/cpu_bits.h
index 999187a9ee..5dc4729ed5 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 23fbbd3216..2182943f54 100644
--- a/target/riscv/csr.c
+++ b/target/riscv/csr.c
@@ -1549,6 +1549,7 @@ riscv_csr_operations csr_ops[CSR_TABLE_SIZE] = {
     [CSR_MARCHID]   = { "marchid",   any,   read_zero    },
     [CSR_MIMPID]    = { "mimpid",    any,   read_zero    },
     [CSR_MHARTID]   = { "mhartid",   any,   read_mhartid },
+    [CSR_MCONFIGPTR] = {"mconfigptr", any,  read_zero    },
 
     /* Machine Trap Setup */
     [CSR_MSTATUS]     = { "mstatus",    any,   read_mstatus,     write_mstatus 
    },
-- 
2.25.1