pretty massive virtual memory rewrite

+ The system is now a bit simpler and hopefully easier to understand, while also
  extending the shared memory to be 1:N, where there is one owner who
  may become a zombie while waiting for the N to die.

1 files changed, 38 insertions, 0 deletions

diff --git a/arch/riscv64/include/uapi.h b/arch/riscv64/include/uapi.h
new file mode 100644
index 0000000..a8c236b
--- /dev/null
+++ b/arch/riscv64/include/uapi.h
@@ -0,0 +1,38 @@
+/* SPDX-License-Identifier: copyleft-next-0.3.1 */
+/* Copyright 2024, Kim Kuparinen < kimi.h.kuparinen@gmail.com > */
+
+#ifndef KMI_RISCV_UAPI_H
+#define KMI_RISCV_UAPI_H
+
+/**
+ * @file uapi.h
+ *
+ * RISCV-specific stuff that should be visible to userspace, currently mainly
+ * VM_R/VM_W/VM_X flags.
+ */
+
+/** Page is active. */
+#define VM_V (1 << 0)
+
+/** Page is readable. */
+#define VM_R (1 << 1)
+
+/** Page is writable. */
+#define VM_W (1 << 2)
+
+/** Page is executable. */
+#define VM_X (1 << 3)
+
+/** Page is user-accessible. */
+#define VM_U (1 << 4)
+
+/** Page is global. */
+#define VM_G (1 << 5)
+
+/** Page has been accessed. */
+#define VM_A (1 << 6)
+
+/** Page is dirty. */
+#define VM_D (1 << 7)
+
+#endif /* KMI_RISCV_UAPI_H */