[PATCH V17 3/6] hw/mips: Implement fw_cfg_arch_key_name()

[Huacai Chen <zltjiangshi@gmail.com>]

Implement fw_cfg_arch_key_name(), which returns the name of a
mips-specific key.

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Huacai Chen <chenhc@lemote.com>
Co-developed-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
---
 hw/mips/fw_cfg.c    | 35 +++++++++++++++++++++++++++++++++++
 hw/mips/fw_cfg.h    | 19 +++++++++++++++++++
 hw/mips/meson.build |  2 +-
 3 files changed, 55 insertions(+), 1 deletion(-)
 create mode 100644 hw/mips/fw_cfg.c
 create mode 100644 hw/mips/fw_cfg.h

diff --git a/hw/mips/fw_cfg.c b/hw/mips/fw_cfg.c
new file mode 100644
index 0000000..67c4a74
--- /dev/null
+++ b/hw/mips/fw_cfg.c
@@ -0,0 +1,35 @@
+/*
+ * QEMU fw_cfg helpers (MIPS specific)
+ *
+ * Copyright (c) 2020 Lemote, Inc.
+ *
+ * Author:
+ *   Huacai Chen (chenhc@lemote.com)
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "hw/mips/fw_cfg.h"
+#include "hw/nvram/fw_cfg.h"
+
+const char *fw_cfg_arch_key_name(uint16_t key)
+{
+    static const struct {
+        uint16_t key;
+        const char *name;
+    } fw_cfg_arch_wellknown_keys[] = {
+        {FW_CFG_MACHINE_VERSION, "machine_version"},
+        {FW_CFG_CPU_FREQ, "cpu_frequency"},
+    };
+
+    for (size_t i = 0; i < ARRAY_SIZE(fw_cfg_arch_wellknown_keys); i++) {
+        if (fw_cfg_arch_wellknown_keys[i].key == key) {
+            return fw_cfg_arch_wellknown_keys[i].name;
+        }
+    }
+    return NULL;
+}
diff --git a/hw/mips/fw_cfg.h b/hw/mips/fw_cfg.h
new file mode 100644
index 0000000..e317d5b
--- /dev/null
+++ b/hw/mips/fw_cfg.h
@@ -0,0 +1,19 @@
+/*
+ * QEMU fw_cfg helpers (MIPS specific)
+ *
+ * Copyright (c) 2020 Huacai Chen
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#ifndef HW_MIPS_FW_CFG_H
+#define HW_MIPS_FW_CFG_H
+
+#include "hw/boards.h"
+#include "hw/nvram/fw_cfg.h"
+
+/* Data for BIOS to identify machine */
+#define FW_CFG_MACHINE_VERSION  (FW_CFG_ARCH_LOCAL + 0)
+#define FW_CFG_CPU_FREQ         (FW_CFG_ARCH_LOCAL + 1)
+
+#endif
diff --git a/hw/mips/meson.build b/hw/mips/meson.build
index bcdf96b..0e9f930 100644
--- a/hw/mips/meson.build
+++ b/hw/mips/meson.build
@@ -1,5 +1,5 @@
 mips_ss = ss.source_set()
-mips_ss.add(files('addr.c', 'mips_int.c'))
+mips_ss.add(files('addr.c', 'mips_int.c', 'fw_cfg.c'))
 mips_ss.add(when: 'CONFIG_FULOONG', if_true: files('fuloong2e.c'))
 mips_ss.add(when: 'CONFIG_JAZZ', if_true: files('jazz.c'))
 mips_ss.add(when: 'CONFIG_MALTA', if_true: files('gt64xxx_pci.c', 'malta.c'))
-- 
2.7.0