[fb] Create fb driver

Create a new framebuffer driver. Also hackily passing frame buffer size
in the list of init handles to all processes and mapping the framebuffer
into all processes. Changed bootloader passing frame buffer as a module
to its own struct.

src/kernel/scheduler.cpp

@@ -22,6 +22,9 @@
 
 scheduler *scheduler::s_instance = nullptr;
 
+extern uintptr_t fb_loc;
+extern size_t fb_size;
+
 const uint64_t rflags_noint = 0x002;
 const uint64_t rflags_int = 0x202;
 
@@ -87,6 +90,12 @@ load_process_image(uintptr_t phys, uintptr_t virt, size_t bytes, TCB *tcb)
 	init->handles[1] = j6_handle_invalid;
 	init->handles[2] = j6_handle_invalid;
 
+	// Crazypants framebuffer part
+	init->handles[1] = reinterpret_cast<j6_handle_t>(fb_size);
+	vma = new vm_area_open(fb_size, space, vm_flags::write|vm_flags::mmio);
+	space.add(0x100000000, vma);
+	vma->commit(fb_loc, 0, memory::page_count(fb_size));
+
 	thread::current().clear_state(thread::state::loading);
 	return tcb->rsp3;
 }
@@ -107,7 +116,7 @@ scheduler::create_process(bool user)
 	return th;
 }
 
-void
+thread *
 scheduler::load_process(uintptr_t phys, uintptr_t virt, size_t size, uintptr_t entry)
 {
 
@@ -145,6 +154,8 @@ scheduler::load_process(uintptr_t phys, uintptr_t virt, size_t size, uintptr_t e
 	log::debug(logs::task, "     RSP  %016lx", tcb->rsp);
 	log::debug(logs::task, "     RSP0 %016lx", tcb->rsp0);
 	log::debug(logs::task, "     PML4 %016lx", tcb->pml4);
+
+	return th;
 }
 
 void