Add the beginning of support for kernel graphics to bootloader.

* Load a font file off disk to pass to kernel
* Expose a framebuffer to the kernel
* Currently the kernel just paints the screen red

src/boot/console.h

@@ -7,3 +7,14 @@ void con_status_begin(const CHAR16 *message);
 void con_status_ok();
 void con_status_fail(const CHAR16 *error);
 size_t con_printf(const CHAR16 *fmt, ...);
+
+EFI_STATUS
+con_get_framebuffer(
+	EFI_BOOT_SERVICES *bootsvc,
+	void **buffer,
+	size_t *buffer_size,
+	uint32_t *hres,
+	uint32_t *vres,
+	uint32_t *rmask,
+	uint32_t *gmask,
+	uint32_t *bmask);