mm: Switch riscv64 to the new page table code

Switch riscv64 to the new page table code, and add a few new wrappers and headers (pmd_mkpmd, et al). This commit also fixed fork() breakage that was introduced at some unknown point in time. Signed-off-by: Pedro Falcato <[email protected]>
heatd · Jul 15, 2024 · 87ff1a3 · 87ff1a3
1 parent a628ce8
commit 87ff1a3
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Showing 8 changed files with 480 additions and 695 deletions.
diff --git a/kernel/arch/riscv64/mmu.cpp b/kernel/arch/riscv64/mmu.cpp
diff --git a/kernel/include/onyx/mm/pgtable-nop4d.h b/kernel/include/onyx/mm/pgtable-nop4d.h
@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2024 Pedro Falcato
+ * This file is part of Onyx, and is released under the terms of the MIT License
+ * check LICENSE at the root directory for more information
+ *
+ * SPDX-License-Identifier: MIT
+ */
+#ifndef _ONYX_PGTABLE_NOP4D_H
+#define _ONYX_PGTABLE_NOP4D_H
+
+#define PTRS_PER_P4D 1
+
+static inline p4d_t *p4d_offset(pgd_t *pgd, unsigned long addr)
+{
+    return (p4d_t *) pgd;
+}
+
+static inline bool pgd_none(pgd_t pgd)
+{
+    return false;
+}
+
+static inline bool pgd_present(pgd_t pgd)
+{
+    return true;
+}
+
+static inline bool p4d_folded(void)
+{
+    return true;
+}
+
+#endif