USB driver polling user app, handle only one XHCI controller for now, Implement USB device addressing

usb/.gitignore

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+*.o
+*.json
+docs/
+.cache/
+*.map
+usb

usb/Makefile

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+include ../make/ufuncs.mk
+
+$(eval $(call add_lib,libstring))
+$(eval $(call add_lib,libprocess))
+$(eval $(call add_lib,libaux))
+$(eval $(call add_lib,libmalloc))
+
+cflags += -DPRINTF_INCLUDE_CONFIG_H=1
+
+include ../make/user.mk

usb/app.mk

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+app := usb

usb/src.mk

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+c += usb.c
+
+o += usb.o

usb/usb.c

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+#include <device_info.h>
+#include <devices.h>
+#include <malloc.h>
+#include <mprintf.h>
+#include <process.h>
+#include <process_self.h>
+#include <status.h>
+#include <string.h>
+#include <system.h>
+
+static void usb_poll_driver_proc (void* arg) {
+  struct device_info* info = arg;
+
+  mprintf ("Polling device %s\n", info->key);
+
+  for (;;) {
+    device_do (info->key, XUSBCTRL_POLL_DRIVER, NULL, NULL, NULL, NULL);
+
+    sched ();
+  }
+}
+
+void app_main (void) {
+  libprocess_self_init ();
+
+  char commandbuf[32];
+  memset (commandbuf, 0, sizeof (commandbuf));
+
+  if (env_get (process_get_pgid (), "C", (void*)commandbuf, sizeof (commandbuf)) != ST_OK) {
+    mprintf ("ERROR C=???. No command provided\n");
+    return;
+  }
+
+  if (strcmp (commandbuf, "poll") == 0) {
+    struct device_info* infos = malloc (sizeof (struct device_info) * 1024);
+    memset (infos, 0, sizeof (struct device_info) * 1024);
+
+    int device_count = get_device_info (infos, 1024);
+
+    for (int dev = 0; dev < device_count; dev++) {
+      struct device_info* info = &infos[dev];
+
+      if (info->type != DEVICE_TYPE_USB_CTRL) {
+        continue;
+      }
+
+      struct process_data* pdata = process_spawn (&usb_poll_driver_proc, info);
+
+      mprintf ("Started USB poller process: PID %d\n", pdata->pid);
+    }
+
+    for (;;)
+      ;
+  } else {
+    mprintf ("ERROR unknown command %s\n", commandbuf);
+  }
+}