cowos moves to 64bit! and framebuffers too ig

kernel/init/kernel.c

@@ -1,10 +1,41 @@
-#include <drivers/video/vga.h>
-#include <string.h>
+#include <klibc/string.h>
+/* #include <drivers/video/vga.h> */
+#include <stddef.h>
+#include <bootloader.h>
+
+static void hcf(void) {
+    for (;;) {
+        __asm__("hlt");
+    }
+}
 
 void
 kernel_main(void)
 {
+        /* Make sure the bootloader understands our base revision */
+        if (LIMINE_BASE_REVISION_SUPPORTED == 0) hcf();
+
+        /* ensure a framebuffer */
+        if (framebuffer_request.response == NULL
+                || framebuffer_request.response->framebuffer_count < 1) hcf();
+
+        /* fetch the first framebuffer */
+        struct limine_framebuffer *framebuffer = framebuffer_request.response->framebuffers[0];
+
+        /* assume framebuffer model is RGB w/32-bit pixels */
+        for (size_t i = 0; i < 100; i++) {
+                volatile uint32_t *fb_ptr = framebuffer->address;
+                fb_ptr[i * (framebuffer->pitch / 4) + i] = 0xffffff;
+        }
+
+        /* need to get an actual framebuffer driver working before we can use vga */
+
+        /*
         term_init();
 
-        term_writestr("Hello World!\n");
+        term_writestr("Hello World!");
+        */
+
+        /* done so now hang */
+        hcf();
 }