[PATCH v4 23/33] target/nios2: Implement nios2_cpu_list()

[Gavin Shan]

Implement nios2_cpu_list() to support cpu_list(). With this applied,
the available CPU model names, same to the CPU type names, are shown
as below.

  $ ./build/qemu-system-nios2 -cpu ?
  Available CPUs:
    nios2-cpu

Signed-off-by: Gavin Shan <gs...@redhat.com>
---
 target/nios2/cpu.c | 20 ++++++++++++++++++++
 target/nios2/cpu.h |  3 +++
 2 files changed, 23 insertions(+)

diff --git a/target/nios2/cpu.c b/target/nios2/cpu.c
index 15e499f828..5981418aee 100644
--- a/target/nios2/cpu.c
+++ b/target/nios2/cpu.c
@@ -21,6 +21,7 @@
 #include "qemu/osdep.h"
 #include "qemu/module.h"
 #include "qapi/error.h"
+#include "qemu/qemu-print.h"
 #include "cpu.h"
 #include "exec/log.h"
 #include "gdbstub/helpers.h"
@@ -111,6 +112,25 @@ static void iic_set_irq(void *opaque, int irq, int level)
 }
 #endif
 
+static void nios2_cpu_list_entry(gpointer data, gpointer user_data)
+{
+    const char *typename = object_class_get_name(OBJECT_CLASS(data));
+    char *model = cpu_model_from_type(typename);
+
+    qemu_printf("  %s\n", model);
+    g_free(model);
+}
+
+void nios2_cpu_list(void)
+{
+    GSList *list;
+
+    list = object_class_get_list_sorted(TYPE_NIOS2_CPU, false);
+    qemu_printf("Available CPUs:\n");
+    g_slist_foreach(list, nios2_cpu_list_entry, NULL);
+    g_slist_free(list);
+}
+
 static void nios2_cpu_initfn(Object *obj)
 {
 #if !defined(CONFIG_USER_ONLY)
diff --git a/target/nios2/cpu.h b/target/nios2/cpu.h
index 70b6377a4f..93bf84b620 100644
--- a/target/nios2/cpu.h
+++ b/target/nios2/cpu.h
@@ -291,6 +291,9 @@ bool nios2_cpu_tlb_fill(CPUState *cs, vaddr address, int 
size,
                         MMUAccessType access_type, int mmu_idx,
                         bool probe, uintptr_t retaddr);
 #endif
+void nios2_cpu_list(void);
+
+#define cpu_list nios2_cpu_list
 
 typedef CPUNios2State CPUArchState;
 typedef Nios2CPU ArchCPU;
-- 
2.41.0