kernel_ldr: finish implementing all core logic.

libraries/libmesosphere/source/arch/arm64/kern_cpu.cpp

@@ -0,0 +1,69 @@
+/*
+ * Copyright (c) 2018-2019 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 <mesosphere.hpp>
+
+namespace ams::kern::arm64::cpu {
+
+    namespace {
+
+        void FlushEntireDataCacheImpl(int level) {
+            /* Used in multiple locations. */
+            const u64 level_sel_value = static_cast<u64>(level << 1);
+
+            /* Set selection register. */
+            cpu::SetCsselrEl1(level_sel_value);
+            cpu::InstructionMemoryBarrier();
+
+            /* Get cache size id info. */
+            CacheSizeIdAccessor ccsidr_el1;
+            const int num_sets  = ccsidr_el1.GetNumberOfSets();
+            const int num_ways  = ccsidr_el1.GetAssociativity();
+            const int line_size = ccsidr_el1.GetLineSize();
+
+            const u64 way_shift = static_cast<u64>(__builtin_clz(num_ways));
+            const u64 set_shift = static_cast<u64>(line_size + 4);
+
+            for (int way = 0; way <= num_ways; way++) {
+                for (int set = 0; set <= num_sets; set++) {
+                    const u64 way_value  = static_cast<u64>(way) << way_shift;
+                    const u64 set_value  = static_cast<u64>(set) << set_shift;
+                    const u64 cisw_value = way_value | set_value | level_sel_value;
+                    __asm__ __volatile__("dc cisw, %0" ::"r"(cisw_value) : "memory");
+                }
+            }
+        }
+
+    }
+
+    void FlushEntireDataCacheShared() {
+        CacheLineIdAccessor clidr_el1;
+        const int levels_of_coherency   = clidr_el1.GetLevelsOfCoherency();
+        const int levels_of_unification = clidr_el1.GetLevelsOfUnification();
+
+        for (int level = levels_of_coherency; level >= levels_of_unification; level--) {
+            FlushEntireDataCacheImpl(level);
+        }
+    }
+
+    void FlushEntireDataCacheLocal() {
+        CacheLineIdAccessor clidr_el1;
+        const int levels_of_unification = clidr_el1.GetLevelsOfUnification();
+
+        for (int level = levels_of_unification - 1; level >= 0; level--) {
+            FlushEntireDataCacheImpl(level);
+        }
+    }
+}