From bd5969fc876a10b18613302db7087ef3c40f18e1 Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Thu, 7 Mar 2024 17:28:00 -0500
Subject: lib: Add mlibc

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 .../internal/aarch64-include/mlibc/arch-defs.hpp    | 12 ++++++++++++
 .../internal/aarch64-include/mlibc/thread.hpp       | 21 +++++++++++++++++++++
 2 files changed, 33 insertions(+)
 create mode 100644 lib/mlibc/options/internal/aarch64-include/mlibc/arch-defs.hpp
 create mode 100644 lib/mlibc/options/internal/aarch64-include/mlibc/thread.hpp

(limited to 'lib/mlibc/options/internal/aarch64-include')

diff --git a/lib/mlibc/options/internal/aarch64-include/mlibc/arch-defs.hpp b/lib/mlibc/options/internal/aarch64-include/mlibc/arch-defs.hpp
new file mode 100644
index 0000000..0a4789f
--- /dev/null
+++ b/lib/mlibc/options/internal/aarch64-include/mlibc/arch-defs.hpp
@@ -0,0 +1,12 @@
+#ifndef MLIBC_ARCH_DEFS_HPP
+#define MLIBC_ARCH_DEFS_HPP
+
+#include <stddef.h>
+
+namespace mlibc {
+
+inline constexpr size_t page_size = 0x1000;
+
+} // namespace mlibc
+
+#endif // MLIBC_ARCH_DEFS_HPP
diff --git a/lib/mlibc/options/internal/aarch64-include/mlibc/thread.hpp b/lib/mlibc/options/internal/aarch64-include/mlibc/thread.hpp
new file mode 100644
index 0000000..b62d832
--- /dev/null
+++ b/lib/mlibc/options/internal/aarch64-include/mlibc/thread.hpp
@@ -0,0 +1,21 @@
+#pragma once
+
+#include <stdint.h>
+#include <mlibc/tcb.hpp>
+
+namespace mlibc {
+
+inline Tcb *get_current_tcb() {
+	// On AArch64, TPIDR_EL0 points to 0x10 bytes before the first TLS block.
+	uintptr_t ptr;
+	asm ("mrs %0, tpidr_el0" : "=r"(ptr));
+	return reinterpret_cast<Tcb *>(ptr + 0x10 - sizeof(Tcb));
+}
+
+inline uintptr_t get_sp() {
+	uintptr_t sp;
+	asm ("mov %0, sp" : "=r"(sp));
+	return sp;
+}
+
+} // namespace mlibc
-- 
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