Some users may not need LSX/LASX, this patch allows the user
enable/disable LSX/LASX features.
e.g
'-cpu max,lsx=on,lasx=on' (default);
'-cpu max,lsx=on,lasx=off' (enabled LSX);
'-cpu max,lsx=off,lasx=on' (error, need lsx=on);
'-cpu max,lsx=off' (disable LSX and LASX).
Signed-off-by: Song Gao <gaos...@loongson.cn>
---
target/loongarch/cpu.c | 64 ++++++++++++++++++++++++++++++++++++++++++
target/loongarch/cpu.h | 7 +++++
2 files changed, 71 insertions(+)
diff --git a/target/loongarch/cpu.c b/target/loongarch/cpu.c
index ef6922e812..8a47d85d8a 100644
--- a/target/loongarch/cpu.c
+++ b/target/loongarch/cpu.c
@@ -478,6 +478,7 @@ static void loongarch_max_initfn(Object *obj)
{
/* '-cpu max' for TCG: we use cpu la464. */
loongarch_la464_initfn(obj);
+ loongarch_cpu_post_init(obj);
}
static void loongarch_cpu_list_entry(gpointer data, gpointer user_data)
@@ -622,6 +623,69 @@ static const MemoryRegionOps loongarch_qemu_ops = {
};
#endif
+static bool loongarch_get_lsx(Object *obj, Error **errp)
+{
+ LoongArchCPU *cpu = LOONGARCH_CPU(obj);
+
+ if (FIELD_EX32(cpu->env.cpucfg[2], CPUCFG2, LSX)) {
+ cpu->has_lsx = true;
+ } else {
+ cpu->has_lsx = false;
+ }
+ return cpu->has_lsx;
+}
+
+static void loongarch_set_lsx(Object *obj, bool value, Error **errp)
+{
+ LoongArchCPU *cpu = LOONGARCH_CPU(obj);
+
+ if (value) {
+ cpu->env.cpucfg[2] = FIELD_DP32(cpu->env.cpucfg[2], CPUCFG2, LSX, 1);
+ } else {
+ cpu->env.cpucfg[2] = FIELD_DP32(cpu->env.cpucfg[2], CPUCFG2, LSX, 0);
+ cpu->env.cpucfg[2] = FIELD_DP32(cpu->env.cpucfg[2], CPUCFG2, LASX, 0);
+ }
+
+ cpu->has_lsx = value;
+}
+
+static bool loongarch_get_lasx(Object *obj, Error **errp)
+{
+ LoongArchCPU *cpu = LOONGARCH_CPU(obj);
+
+ if (FIELD_EX32(cpu->env.cpucfg[2], CPUCFG2, LASX)) {
+ cpu->has_lasx = true;
+ } else {
+ cpu->has_lasx = false;
+ }
+ return cpu->has_lasx;
+}
+
+static void loongarch_set_lasx(Object *obj, bool value, Error **errp)
+{
+ LoongArchCPU *cpu = LOONGARCH_CPU(obj);
+
+ if (value) {
+ if (!FIELD_EX32(cpu->env.cpucfg[2], CPUCFG2, LSX)) {
+ error_setg(errp, "Enabled LASX, need enabled LSX first!");
+ return;
+ }
+ cpu->env.cpucfg[2] = FIELD_DP32(cpu->env.cpucfg[2], CPUCFG2, LASX, 1);
+ } else {
+ cpu->env.cpucfg[2] = FIELD_DP32(cpu->env.cpucfg[2], CPUCFG2, LASX, 0);
+ }
+
+ cpu->has_lasx = value;
+}
+
+void loongarch_cpu_post_init(Object *obj)
+{
+ object_property_add_bool(obj, "lsx", loongarch_get_lsx,
+ loongarch_set_lsx);
+ object_property_add_bool(obj, "lasx", loongarch_get_lasx,
+ loongarch_set_lasx);
+}
+
static void loongarch_cpu_init(Object *obj)
{
#ifndef CONFIG_USER_ONLY
diff --git a/target/loongarch/cpu.h b/target/loongarch/cpu.h
index 8b54cf109c..d927377c49 100644
--- a/target/loongarch/cpu.h
+++ b/target/loongarch/cpu.h
@@ -381,6 +381,11 @@ struct ArchCPU {
/* 'compatible' string for this CPU for Linux device trees */
const char *dtb_compatible;
+
+ /* CPU has LSX */
+ bool has_lsx;
+ /* CPU has LASX */
+ bool has_lasx;
};
#define TYPE_LOONGARCH_CPU "loongarch-cpu"
@@ -486,4 +491,6 @@ void loongarch_cpu_list(void);
#define LOONGARCH_CPU_TYPE_NAME(model) model LOONGARCH_CPU_TYPE_SUFFIX
#define CPU_RESOLVING_TYPE TYPE_LOONGARCH_CPU
+void loongarch_cpu_post_init(Object *obj);
+
#endif /* LOONGARCH_CPU_H */
--
2.25.1
