[project] Generate syscalls from new interface DSL

This change adds a new interface DSL for specifying objects (with
methods) and interfaces (that expose objects, and optionally have their
own methods).

Significant changes:

- Add the new scripts/definitions Python module to parse the DSL
- Add the new definitions directory containing DSL definition files
- Use cog to generate syscall-related code in kernel and libj6
- Unify ordering of pointer + length pairs in interfaces

src/kernel/syscalls/system.cpp

@@ -15,7 +15,7 @@ extern log::logger &g_logger;
 namespace syscalls {
 
 j6_status_t
-system_log(const char *message)
+log(const char *message)
 {
     if (message == nullptr)
         return j6_err_invalid_arg;
@@ -26,7 +26,7 @@ system_log(const char *message)
 }
 
 j6_status_t
-system_noop()
+noop()
 {
     thread &th = thread::current();
     log::debug(logs::syscall, "Thread %llx called noop syscall.", th.koid());
@@ -61,18 +61,18 @@ system_bind_irq(j6_handle_t sys, j6_handle_t endp, unsigned irq)
 }
 
 j6_status_t
-system_map_phys(j6_handle_t sys, j6_handle_t *vma_handle, uintptr_t phys_addr, size_t size, uint32_t flags)
+system_map_phys(j6_handle_t handle, j6_handle_t * area, uintptr_t phys, size_t size, uint32_t flags)
 {
     // TODO: check capabilities on sys handle
-    if (!vma_handle) return j6_err_invalid_arg;
+    if (!area) return j6_err_invalid_arg;
 
     // TODO: check to see if frames are already used? How would that collide with
     // the bootloader's allocated pages already being marked used?
     if (!(flags & vm_flags::mmio))
-        frame_allocator::get().used(phys_addr, memory::page_count(size));
+        frame_allocator::get().used(phys, memory::page_count(size));
 
     vm_flags vmf = (static_cast<vm_flags>(flags) & vm_flags::driver_mask);
-    construct_handle<vm_area_fixed>(vma_handle, phys_addr, size, vmf);
+    construct_handle<vm_area_fixed>(area, phys, size, vmf);
 
     return j6_status_ok;
 }