LogManager: implement system module, client api, logging api (#1617)

Some notes:

* Unless `atmosphere!enable_log_manager` is true, Nintendo's log manager will be used instead.
  * This prevents paying memory costs for LM when not enabling logging.
  * To facilitate this, Atmosphere's log manager has a different program id from Nintendo's.
  * `atmosphere!enable_htc` implies `atmosphere!enable_log_manager`.
* LogManager logs to tma, and the SD card (if `lm!enable_sd_card_logging` is true, which it is by default).
* Binary logs are saved to `lm!sd_card_log_output_directory`, which is `atmosphere/binlogs` by default.

libraries/libstratosphere/source/lm/sf/lm_i_log_getter.hpp

@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2018-2020 Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#pragma once
+#include <stratosphere.hpp>
+
+#define AMS_LM_I_LOG_GETTER_INTERFACE_INFO(C, H)                                                                                                                                         \
+    AMS_SF_METHOD_INFO(C, H, 0, Result, StartLogging, (),                                                                                           ())                                  \
+    AMS_SF_METHOD_INFO(C, H, 1, Result, StopLogging,  (),                                                                                           ())                                  \
+    AMS_SF_METHOD_INFO(C, H, 2, Result, GetLog,       (const sf::OutAutoSelectBuffer &message, sf::Out<s64> out_size, sf::Out<u32> out_drop_count), (message, out_size, out_drop_count))
+
+AMS_SF_DEFINE_INTERFACE(ams::lm, ILogGetter, AMS_LM_I_LOG_GETTER_INTERFACE_INFO)

libraries/libstratosphere/source/lm/sf/lm_i_log_service.hpp

@@ -0,0 +1,28 @@
+/*
+ * Copyright (c) 2018-2020 Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#pragma once
+#include <stratosphere.hpp>
+
+#define AMS_LM_I_LOGGER_INTERFACE_INFO(C, H)                                                                    \
+    AMS_SF_METHOD_INFO(C, H, 0, Result, Log,            (const sf::InAutoSelectBuffer &message), (message))     \
+    AMS_SF_METHOD_INFO(C, H, 1, Result, SetDestination, (u32 destination),                       (destination))
+
+AMS_SF_DEFINE_INTERFACE(ams::lm, ILogger, AMS_LM_I_LOGGER_INTERFACE_INFO)
+
+#define AMS_LM_I_LOG_SERVICE_INTERFACE_INFO(C, H) \
+    AMS_SF_METHOD_INFO(C, H, 0, Result, OpenLogger, (sf::Out<sf::SharedPointer<::ams::lm::ILogger>> out, const sf::ClientProcessId &client_process_id), (out, client_process_id))
+
+AMS_SF_DEFINE_INTERFACE(ams::lm, ILogService, AMS_LM_I_LOG_SERVICE_INTERFACE_INFO)