PTW is short for page table walker, it is hardware page table walker
function. With PTW supported, hardware MMU will parse page table
table and update TLB entries automatically.

This patch adds type OnOffAuto for PTW feature setting.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Reviewed-by: Song Gao <gaosong@loongson.cn>
---
 target/loongarch/cpu.c | 26 ++++++++++++++++++++++++++
 target/loongarch/cpu.h |  2 ++
 2 files changed, 28 insertions(+)

diff --git a/target/loongarch/cpu.c b/target/loongarch/cpu.c
index 86490e0f72..e80a92fb2e 100644
--- a/target/loongarch/cpu.c
+++ b/target/loongarch/cpu.c
@@ -224,6 +224,25 @@ static void loongarch_set_msgint(Object *obj, bool value, Error **errp)
      cpu->env.cpucfg[1] = FIELD_DP32(cpu->env.cpucfg[1], CPUCFG1, MSG_INT, value);
 }
 
+static bool loongarch_get_ptw(Object *obj, Error **errp)
+{
+    return LOONGARCH_CPU(obj)->ptw != ON_OFF_AUTO_OFF;
+}
+
+static void loongarch_set_ptw(Object *obj, bool value, Error **errp)
+{
+    LoongArchCPU *cpu = LOONGARCH_CPU(obj);
+
+    cpu->ptw = value ? ON_OFF_AUTO_ON : ON_OFF_AUTO_OFF;
+
+    if (kvm_enabled()) {
+        /* PTW feature is only support in TCG mode now */
+        return;
+    }
+
+    cpu->env.cpucfg[2] = FIELD_DP32(cpu->env.cpucfg[2], CPUCFG2, HPTW, value);
+}
+
 static void loongarch_cpu_post_init(Object *obj)
 {
     LoongArchCPU *cpu = LOONGARCH_CPU(obj);
@@ -238,7 +257,10 @@ static void loongarch_cpu_post_init(Object *obj)
                              loongarch_set_lasx);
     object_property_add_bool(obj, "msgint", loongarch_get_msgint,
                              loongarch_set_msgint);
+    object_property_add_bool(obj, "ptw", loongarch_get_ptw,
+                             loongarch_set_ptw);
     /* lbt is enabled only in kvm mode, not supported in tcg mode */
+
     if (kvm_enabled()) {
         kvm_loongarch_cpu_post_init(cpu);
     }
@@ -346,6 +368,7 @@ static void loongarch_la464_initfn(Object *obj)
     env->CSR_PRCFG3 = FIELD_DP64(env->CSR_PRCFG3, CSR_PRCFG3, STLB_SETS, 8);
 
     cpu->msgint = ON_OFF_AUTO_OFF;
+    cpu->ptw = ON_OFF_AUTO_OFF;
     loongarch_la464_init_csr(obj);
     loongarch_cpu_post_init(obj);
 }
@@ -377,6 +400,7 @@ static void loongarch_la132_initfn(Object *obj)
     data = FIELD_DP32(data, CPUCFG1, CRC, 1);
     env->cpucfg[1] = data;
     cpu->msgint = ON_OFF_AUTO_OFF;
+    cpu->ptw = ON_OFF_AUTO_OFF;
 }
 
 static void loongarch_max_initfn(Object *obj)
@@ -388,6 +412,8 @@ static void loongarch_max_initfn(Object *obj)
     if (tcg_enabled()) {
         cpu->env.cpucfg[1] = FIELD_DP32(cpu->env.cpucfg[1], CPUCFG1, MSG_INT, 1);
         cpu->msgint = ON_OFF_AUTO_AUTO;
+        cpu->env.cpucfg[2] = FIELD_DP32(cpu->env.cpucfg[2], CPUCFG2, HPTW, 1);
+        cpu->ptw = ON_OFF_AUTO_AUTO;
     }
 }
 
diff --git a/target/loongarch/cpu.h b/target/loongarch/cpu.h
index b8e3b46c3a..b1d6799222 100644
--- a/target/loongarch/cpu.h
+++ b/target/loongarch/cpu.h
@@ -137,6 +137,7 @@ FIELD(CPUCFG2, LBT_MIPS, 20, 1)
 FIELD(CPUCFG2, LBT_ALL, 18, 3)
 FIELD(CPUCFG2, LSPW, 21, 1)
 FIELD(CPUCFG2, LAM, 22, 1)
+FIELD(CPUCFG2, HPTW, 24, 1)
 
 /* cpucfg[3] bits */
 FIELD(CPUCFG3, CCDMA, 0, 1)
@@ -402,6 +403,7 @@ struct ArchCPU {
     uint32_t  phy_id;
     OnOffAuto lbt;
     OnOffAuto pmu;
+    OnOffAuto ptw;
     OnOffAuto lsx;
     OnOffAuto lasx;
     OnOffAuto msgint;
-- 
2.43.5