Implement storedevs, prepare to port littlefs

kernel/storedev/storedev.c

@@ -0,0 +1,57 @@
+#include <stdint.h>
+#include <stddef.h>
+#include "storedev.h"
+#include "spinlock/spinlock.h"
+#include "kprintf.h"
+#include "errors.h"
+#include "dlmalloc/malloc.h"
+#include "ramsd.h"
+#include "util/util.h"
+
+StoreDevList STOREDEV_LIST;
+
+void storedev_init(void) {
+  spinlock_init(&STOREDEV_LIST.spinlock);
+  STOREDEV_LIST.head = NULL;
+
+  LOG("storedev", "init\n");
+}
+
+StoreDev *storedev_create(int32_t sdtype, void *extra) {
+  StoreDev *sd = dlmalloc(sizeof(*sd));
+  if (sd == NULL) {
+    return NULL;
+  }
+
+  spinlock_acquire(&STOREDEV_LIST.spinlock);
+
+  switch (sdtype) {
+    case STOREDEV_RAMSD: {
+      spinlock_init(&sd->spinlock);
+      sd->sdtype = STOREDEV_RAMSD;
+      sd->init = &ramsd_init;
+      sd->cleanup = &ramsd_cleanup;
+      sd->read = &ramsd_read;
+      sd->write = &ramsd_write;
+
+      int32_t err = sd->init(sd, extra);
+      if (err != E_OK) {
+        spinlock_release(&STOREDEV_LIST.spinlock);
+        return NULL;
+      }
+      LL_APPEND(STOREDEV_LIST.head, sd);
+    } break;
+    default:
+      spinlock_release(&STOREDEV_LIST.spinlock);
+      return NULL;
+  }
+  spinlock_release(&STOREDEV_LIST.spinlock);
+  return sd;
+}
+
+int32_t storedev_delete(StoreDev *sd) {
+  spinlock_acquire(&STOREDEV_LIST.spinlock);
+  LL_REMOVE(STOREDEV_LIST.head, sd);
+  int32_t err = sd->cleanup(sd);
+  spinlock_release(&STOREDEV_LIST.spinlock);
+}