From ac853db5f05adcd4eb50ea03d3f9692516413836 Mon Sep 17 00:00:00 2001
From: SciresM <Sciresm@gmail.com>
Date: Thu, 25 Oct 2018 06:16:35 +0900
Subject: [PATCH] set:sys: Add GetFirmwareVersion(2) (#190)

* set:sys: Add GetFirmwareVersion
---
 nx/include/switch/services/set.h | 22 ++++++++++++++++
 nx/source/services/set.c         | 43 ++++++++++++++++++++++++++++++++
 2 files changed, 65 insertions(+)

diff --git a/nx/include/switch/services/set.h b/nx/include/switch/services/set.h
index c707d2d0..1b085ac2 100644
--- a/nx/include/switch/services/set.h
+++ b/nx/include/switch/services/set.h
@@ -64,6 +64,22 @@ typedef enum {
     SetSysFlag_HeadphoneVolumeUpdate = 117,
 } SetSysFlag;
 
+/// Structure returned by \ref setsysGetFirmwareVersion
+typedef struct {
+    u8 major;
+    u8 minor;
+    u8 micro;
+    u8 padding1;
+    u8 revision_major;
+    u8 revision_minor;
+    u8 padding2;
+    u8 padding3;
+    char platform[0x20];
+    char version_hash[0x40];
+    char display_version[0x18];
+    char display_title[0x80];
+} SetSysFirmwareVersion;
+
 Result setInitialize(void);
 void setExit(void);
 
@@ -132,3 +148,9 @@ Result setsysGetFlag(SetSysFlag flag, bool *out);
  * @param enable To enable/disable the flag.
  */
 Result setsysSetFlag(SetSysFlag flag, bool enable);
+
+/**
+ * @brief Gets the system firmware version.
+ * @param out Firmware version to populate.
+ */
+Result setsysGetFirmwareVersion(SetSysFirmwareVersion *out);
diff --git a/nx/source/services/set.c b/nx/source/services/set.c
index 1ff7296a..375735bf 100644
--- a/nx/source/services/set.c
+++ b/nx/source/services/set.c
@@ -570,3 +570,46 @@ Result setsysSetFlag(SetSysFlag flag, bool enable) {
 
     return rc;
 }
+
+static Result _setsysGetFirmwareVersionImpl(SetSysFirmwareVersion *out, u32 cmd_id) {
+    IpcCommand c;
+    ipcInitialize(&c);
+    ipcAddRecvStatic(&c, out, sizeof(*out), 0);
+    
+    struct {
+        u64 magic;
+        u64 cmd_id;
+    } *raw;
+
+    raw = serviceIpcPrepareHeader(&g_setsysSrv, &c, sizeof(*raw));
+
+    raw->magic = SFCI_MAGIC;
+    raw->cmd_id = cmd_id;
+
+    Result rc = serviceIpcDispatch(&g_setsysSrv);
+
+    if (R_SUCCEEDED(rc)) {
+        IpcParsedCommand r;
+        struct {
+            u64 magic;
+            u64 result;
+        } *resp;
+        
+        serviceIpcParse(&g_setsysSrv, &r, sizeof(*resp));
+        resp = r.Raw;
+
+        rc = resp->result;
+    }
+
+    return rc;
+
+}
+
+Result setsysGetFirmwareVersion(SetSysFirmwareVersion *out) {
+    /* GetFirmwareVersion2 does exactly what GetFirmwareVersion does, except it doesn't zero the revision field. */
+    if (kernelAbove300()) {
+        return _setsysGetFirmwareVersionImpl(out, 4);
+    } else {
+        return _setsysGetFirmwareVersionImpl(out, 3);
+    }
+}