fusee_cpp: Implement fatal display, reading of fusee-secondary

fusee_cpp/program/source/fusee_fatal.cpp

@@ -0,0 +1,91 @@
+/*
+ * 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/>.
+ */
+#include <exosphere.hpp>
+#include "fusee_fatal.hpp"
+#include "fs/fusee_fs_api.hpp"
+
+namespace ams::nxboot {
+
+    namespace {
+
+        Result SaveFatalErrorContext(const ams::impl::FatalErrorContext *ctx) {
+            /* Create and open the file. */
+            fs::FileHandle file;
+            {
+                /* Generate the file path. */
+                char path[0x40];
+                util::TSNPrintf(path, sizeof(path), "sdmc:/atmosphere/fatal_errors/report_%016" PRIx64 ".bin", ctx->report_identifier);
+
+                /* Create the file. */
+                R_TRY(fs::CreateFile(path, sizeof(*ctx)));
+
+                /* Open the file. */
+                R_TRY(fs::OpenFile(std::addressof(file), path, fs::OpenMode_ReadWrite));
+            }
+
+            /* Ensure we close the file when done with it. */
+            ON_SCOPE_EXIT { fs::CloseFile(file); };
+
+            /* Write the context to the file. */
+            R_TRY(fs::WriteFile(file, 0, ctx, sizeof(*ctx), fs::WriteOption::Flush));
+
+            return ResultSuccess();
+        }
+
+    }
+
+    void SaveAndShowFatalError() {
+        /* Get the context (at static location in memory). */
+        ams::impl::FatalErrorContext *f_ctx = reinterpret_cast<ams::impl::FatalErrorContext *>(0x4003E000);
+
+        /* Check for valid magic. */
+        if (f_ctx->magic != ams::impl::FatalErrorContext::Magic) {
+            return;
+        }
+
+        /* Show the fatal error. */
+        ShowFatalError(f_ctx, SaveFatalErrorContext(f_ctx));
+
+        /* Clear the magic. */
+        f_ctx->magic = ~f_ctx->magic;
+
+        /* Wait for reboot. */
+        WaitForReboot();
+    }
+
+    void WaitForReboot() {
+        /* Wait for power button to be pressed. */
+        while (!pmic::IsPowerButtonPressed()) {
+            util::WaitMicroSeconds(100);
+        }
+
+        /* If not erista, just do a normal reboot. */
+        if (fuse::GetSocType() != fuse::SocType_Erista) {
+            /* Reboot. */
+            pmic::ShutdownSystem(true);
+
+            /* Wait for our reboot to complete. */
+            AMS_INFINITE_LOOP();
+        }
+
+        /* TODO: Reboot to payload. */
+        pmic::ShutdownSystem(true);
+
+        /* Wait for our reboot to complete. */
+        AMS_INFINITE_LOOP();
+    }
+
+}