freertos: release the generic version source code

freertos runs on the second core (small one) of the CPU

freertos/cvitek/common/include/cv1835/linux/fdtable.h

@@ -0,0 +1,93 @@
+/*
+ * descriptor table internals; you almost certainly want file.h instead.
+ */
+
+#ifndef __LINUX_FDTABLE_H
+#define __LINUX_FDTABLE_H
+
+//#include <linux/posix_types.h>
+#include <linux/compiler.h>
+#include <linux/spinlock.h>
+//#include <linux/rcupdate.h>
+#include <linux/types.h>
+//#include <linux/init.h>
+#include <linux/fs.h>
+
+#include <linux/atomic.h>
+
+/*
+ * The default fd array needs to be at least BITS_PER_LONG,
+ * as this is the granularity returned by copy_fdset().
+ */
+#define NR_OPEN_DEFAULT BITS_PER_LONG
+
+struct fdtable {
+	unsigned int max_fds;
+	struct file __rcu **fd;      /* current fd array */
+//	unsigned long *close_on_exec;
+	unsigned long *open_fds;
+	unsigned long *full_fds_bits;
+//	struct rcu_head rcu;
+};
+#if 0
+static inline bool close_on_exec(unsigned int fd, const struct fdtable *fdt)
+{
+	return test_bit(fd, fdt->close_on_exec);
+}
+
+static inline bool fd_is_open(unsigned int fd, const struct fdtable *fdt)
+{
+	return test_bit(fd, fdt->open_fds);
+}
+#endif
+/*
+ * Open file table structure
+ */
+struct files_struct {
+  /*
+   * read mostly part
+   */
+	atomic_t count;
+	//bool resize_in_progress;
+	//wait_queue_head_t resize_wait;
+
+	struct fdtable __rcu *fdt;
+	struct fdtable fdtab;
+  /*
+   * written part on a separate cache line in SMP
+   */
+	spinlock_t file_lock;
+	//spinlock_t file_lock ____cacheline_aligned_in_smp;
+	unsigned int next_fd;
+	unsigned long close_on_exec_init[1];
+	unsigned long open_fds_init[1];
+	unsigned long full_fds_bits_init[1];
+	struct file __rcu *fd_array[NR_OPEN_DEFAULT];
+};
+extern int __alloc_fd(struct files_struct *files,
+	unsigned int start, unsigned int end, unsigned int flags);
+extern void __fd_install(struct files_struct *files,
+	unsigned int fd, struct file *file);
+extern int __close_fd(unsigned int fd);
+
+//extern struct kmem_cache *files_cachep;
+
+/*
+ * The caller must ensure that fd table isn't shared or hold rcu or file lock
+ */
+static inline struct file *__fcheck_files(struct files_struct *files, unsigned int fd)
+{
+	struct fdtable *fdt = files->fdt; //rcu_dereference_raw(files->fdt);
+
+	if (fd < fdt->max_fds)
+		return fdt->fd[fd];
+	return NULL;
+}
+
+static inline struct file *fcheck_files(struct files_struct *files, unsigned int fd)
+{
+	return __fcheck_files(files, fd);
+}
+
+
+#endif /* __LINUX_FDTABLE_H */