x86_64: extract constants from bootstrap code

1 files changed, 66 insertions, 0 deletions

diff --git a/arch/x86_64/include/x86_64/boot/boot.hpp b/arch/x86_64/include/x86_64/boot/boot.hpp
new file mode 100644
index 0000000..066e49e
--- /dev/null
+++ b/arch/x86_64/include/x86_64/boot/boot.hpp
@@ -0,0 +1,66 @@
+#ifndef TEACHOS_X86_64_BOOT_BOOT_H
+#define TEACHOS_X86_64_BOOT_BOOT_H
+
+#ifdef __ASSEMBLER__
+/**
+ * @brief The number of huge pages to map during bootstrap.
+ */
+#define HUGE_PAGES_TO_MAP (16)
+
+/**
+ * @brief The magic value to be set in eax by the multiboot 2 loader.
+ */
+#define MULTIBOOT2_MAGIC (0x36d76289)
+
+/**
+ * @brief The "A" bit in a GDT entry.
+ */
+#define GDT_ACCESSED (1 << 40)
+
+/**
+ * @brief The "R/W" bit in a GDT entry
+ */
+#define GDT_READ_WRITE (1 << 41)
+
+/**
+ * @brief The "E" bit in a GDT entry.
+ */
+#define GDT_EXECUTABLE (1 << 43)
+
+/**
+ * @brief The "S" bit in a GDT entry.
+ */
+#define GDT_DESCRIPTOR_TYPE (1 << 44)
+
+/**
+ * @brief The "P" bit in a GDT entry.
+ */
+#define GDT_PRESENT (1 << 47)
+
+/**
+ * @brief The "L" bit in a GDT entry.
+ */
+#define GDT_LONG_MODE (1 << 53)
+
+#else
+
+#include "arch/asm_pointer.hpp"
+
+#include <multiboot2/information.hpp>
+
+extern "C"
+{
+  /**
+   * @brief A pointer to the multiboot 2 information structure provided by the boot loader.
+   */
+  extern teachos::arch::asm_pointer<multiboot2::information_view> multiboot_information_pointer;
+
+  /**
+   * @brief A pointer to the VGA text mode buffer.
+   */
+  extern teachos::arch::asm_pointer<std::pair<char, std::byte>> vga_buffer_pointer;
+}
+
+#endif
+
+#endif