[libj6] Remove driver_main

The `driver_main` sinature was an alternate signature for `main`
implemented with weak symbols, but it causes linking issues when not
statically linked, and drivers are going to work differently soon
anyway. Just get rid of it for now.

src/libraries/j6/include/j6/init.h

@@ -73,6 +73,9 @@ struct j6_init_args
 /// Find the first handle of the given type held by this process
 j6_handle_t j6_find_first_handle(j6_object_type obj_type);
 
+/// Get the init args
+const j6_init_args * j6_get_init_args();
+
 /// Drivers may use driver_main instead of main
 int driver_main(unsigned, const char **, const char **, const j6_init_args *);
 

src/libraries/j6/init.cpp

@@ -36,12 +36,18 @@ j6_find_first_handle(j6_object_type obj_type)
     return j6_handle_invalid;
 }
 
-extern "C" j6_init_args *
+const j6_init_args *
+j6_get_init_args()
+{
+    return &init_args;
+}
+
+extern "C" void
 __init_libj6(uint64_t arg0, uint64_t arg1)
 {
     init_args.args[0] = arg0;
     init_args.args[1] = arg1;
-    return &init_args;
 }
 
+
 #endif // __j6kernel

src/libraries/j6/j6.module

@@ -7,7 +7,6 @@ j6 = module("j6",
         "channel.cpp",
         "condition.cpp",
         "init.cpp",
-        "init.s",
         "memutils.cpp",
         "mutex.cpp",
         "protocol_ids.cpp",

src/user/drv.uefi_fb/main.cpp

@@ -20,7 +20,7 @@ extern "C" {
 }
 
 int
-driver_main(unsigned argc, const char **argv, const char **env, const j6_init_args *init)
+main(int argc, const char **argv, const char **env)
 {
     j6::syslog("fb driver starting");
 
@@ -28,6 +28,7 @@ driver_main(unsigned argc, const char **argv, const char **env, const j6_init_ar
     using bootproto::devices::video_mode;
     using bootproto::devices::fb_layout;
 
+    const j6_init_args *init = j6_get_init_args();
     const uefi_fb *fb = reinterpret_cast<const uefi_fb*>(init->args[0]);
 
     if (!fb || !fb->framebuffer) {

src/user/srv.init/main.cpp

@@ -27,7 +27,7 @@ using bootproto::module_type;
 constexpr uintptr_t stack_top = 0xf80000000;
 
 int
-driver_main(unsigned argc, const char **argv, const char **env, const j6_init_args *initp)
+main(int argc, const char **argv, const char **env)
 {
     j6_status_t s;
 
@@ -74,6 +74,7 @@ driver_main(unsigned argc, const char **argv, const char **env, const j6_init_ar
     if (s != j6_status_ok)
         return s;
 
+    const j6_init_args *initp = j6_get_init_args();
     uintptr_t modules_addr = initp->args[0];
 
     std::vector<const module*> mods;