Create kernel build infrastructure

1 files changed, 49 insertions, 0 deletions

diff --git a/kernel/entry.cxx b/kernel/entry.cxx
new file mode 100644
index 0000000..b5bc210
--- /dev/null
+++ b/kernel/entry.cxx
@@ -0,0 +1,49 @@
+#include "../vendor/limine/limine.h"
+#include <cstdint>
+
+__attribute__ ((used, section(".requests")))
+static volatile LIMINE_BASE_REVISION(3);
+
+__attribute__ ((used, section(".requests")))
+static volatile limine_framebuffer_request framebuffer_request = {
+    .id = LIMINE_FRAMEBUFFER_REQUEST,
+    .revision = 0,
+    .response = nullptr
+};
+
+__attribute__ ((used, section(".requests_start")))
+static volatile LIMINE_REQUESTS_START_MARKER;
+
+__attribute__ ((used, section(".requests_end")))
+static volatile LIMINE_REQUESTS_END_MARKER;
+
+static void hcf (void)
+{
+    for (;;)
+    {
+        asm ("hlt");
+    }
+}
+
+void init (void);
+
+extern "C" void _launch (void);
+void _launch (void)
+{
+    if (LIMINE_BASE_REVISION_SUPPORTED == false)
+    {
+        hcf();
+    }
+
+    struct limine_framebuffer *fb = framebuffer_request.response->framebuffers[0];
+    for (std::size_t i = 0; i < (fb->width - 1) * (fb->height - 1); i += 2)
+    {
+        volatile std::uint32_t *fbptr = static_cast<std::uint32_t *>(fb->address);
+        fbptr[i] = 0xffffff;
+    }
+
+    // Global C++ constructors
+    init();
+
+    hcf();
+}