[PATCH v3 06/10] target/riscv: Add mips.pref instruction

[Djordje Todorovic]

Add MIPS P8700 prefetch instruction defined by Xmipscbop.

Signed-off-by: Chao-ying Fu <cfu@mips.com>
Signed-off-by: Djordje Todorovic <djordje.todorovic@htecgroup.com>
---
 target/riscv/cpu.c                        |  3 +++
 target/riscv/cpu_cfg.h                    |  3 ++-
 target/riscv/cpu_cfg_fields.h.inc         |  1 +
 target/riscv/insn_trans/trans_xmips.c.inc | 14 ++++++++++++++
 target/riscv/xmips.decode                 |  1 +
 5 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
index 6ed767e922..c96bf08edd 100644
--- a/target/riscv/cpu.c
+++ b/target/riscv/cpu.c
@@ -242,6 +242,7 @@ const RISCVIsaExtData isa_edata_arr[] = {
     ISA_EXT_DATA_ENTRY(xtheadmempair, PRIV_VERSION_1_11_0, ext_xtheadmempair),
     ISA_EXT_DATA_ENTRY(xtheadsync, PRIV_VERSION_1_11_0, ext_xtheadsync),
     ISA_EXT_DATA_ENTRY(xventanacondops, PRIV_VERSION_1_12_0, 
ext_XVentanaCondOps),
+    ISA_EXT_DATA_ENTRY(xmipscbop, PRIV_VERSION_1_12_0, ext_xmipscbop),
     ISA_EXT_DATA_ENTRY(xmipscmov, PRIV_VERSION_1_12_0, ext_xmipscmov),
 
     { },
@@ -1361,6 +1362,7 @@ const RISCVCPUMultiExtConfig riscv_cpu_vendor_exts[] = {
     MULTI_EXT_CFG_BOOL("xtheadmempair", ext_xtheadmempair, false),
     MULTI_EXT_CFG_BOOL("xtheadsync", ext_xtheadsync, false),
     MULTI_EXT_CFG_BOOL("xventanacondops", ext_XVentanaCondOps, false),
+    MULTI_EXT_CFG_BOOL("xmipscbop", ext_xmipscbop, false),
     MULTI_EXT_CFG_BOOL("xmipscmov", ext_xmipscmov, false),
 
     { },
@@ -3180,6 +3182,7 @@ static const TypeInfo riscv_cpu_type_infos[] = {
         .cfg.pmp = true,
         .cfg.ext_zba = true,
         .cfg.ext_zbb = true,
+        .cfg.ext_xmipscbop = true,
         .cfg.ext_xmipscmov = true,
         .cfg.marchid = 0x8000000000000201,
 #ifndef CONFIG_USER_ONLY
diff --git a/target/riscv/cpu_cfg.h b/target/riscv/cpu_cfg.h
index 2db471ad17..9734963035 100644
--- a/target/riscv/cpu_cfg.h
+++ b/target/riscv/cpu_cfg.h
@@ -22,6 +22,7 @@
 #define RISCV_CPU_CFG_H
 
 struct RISCVCPUConfig {
+
 #define BOOL_FIELD(x) bool x;
 #define TYPED_FIELD(type, x, default) type x;
 #include "cpu_cfg_fields.h.inc"
@@ -38,7 +39,7 @@ static inline bool always_true_p(const RISCVCPUConfig *cfg 
__attribute__((__unus
 
 static inline bool has_xmips_p(const RISCVCPUConfig *cfg)
 {
-    return cfg->ext_xmipscmov;
+    return cfg->ext_xmipscbop || cfg->ext_xmipscmov;
 }
 
 static inline bool has_xthead_p(const RISCVCPUConfig *cfg)
diff --git a/target/riscv/cpu_cfg_fields.h.inc 
b/target/riscv/cpu_cfg_fields.h.inc
index baedf0c466..9ee0a099bb 100644
--- a/target/riscv/cpu_cfg_fields.h.inc
+++ b/target/riscv/cpu_cfg_fields.h.inc
@@ -145,6 +145,7 @@ BOOL_FIELD(ext_xtheadmemidx)
 BOOL_FIELD(ext_xtheadmempair)
 BOOL_FIELD(ext_xtheadsync)
 BOOL_FIELD(ext_XVentanaCondOps)
+BOOL_FIELD(ext_xmipscbop)
 BOOL_FIELD(ext_xmipscmov)
 
 BOOL_FIELD(mmu)
diff --git a/target/riscv/insn_trans/trans_xmips.c.inc 
b/target/riscv/insn_trans/trans_xmips.c.inc
index 269b1082a6..6555a6062a 100644
--- a/target/riscv/insn_trans/trans_xmips.c.inc
+++ b/target/riscv/insn_trans/trans_xmips.c.inc
@@ -19,6 +19,12 @@
  *            (https://mips.com/products/hardware/p8700/)
  */
 
+#define REQUIRE_XMIPSCBOP(ctx) do {              \
+    if (!ctx->cfg_ptr->ext_xmipscbop) {          \
+        return false;                            \
+    }                                            \
+} while (0)
+
 #define REQUIRE_XMIPSCMOV(ctx) do {              \
     if (!ctx->cfg_ptr->ext_xmipscmov) {          \
         return false;                            \
@@ -40,3 +46,11 @@ static bool trans_ccmov(DisasContext *ctx, arg_ccmov *a)
 
     return true;
 }
+
+static bool trans_pref(DisasContext *ctx, arg_pref *a)
+{
+    REQUIRE_XMIPSCBOP(ctx);
+
+    /* Nop */
+    return true;
+}
diff --git a/target/riscv/xmips.decode b/target/riscv/xmips.decode
index cb334fa4bd..697bf26c26 100644
--- a/target/riscv/xmips.decode
+++ b/target/riscv/xmips.decode
@@ -9,3 +9,4 @@
 #            (https://mips.com/products/hardware/p8700/)
 
 ccmov          rs3:5 11 rs2:5 rs1:5 011 rd:5 0001011
+pref        000 imm_9:9 rs1:5 000 imm_hint:5 0001011
-- 
2.34.1