freertos: release the generic version source code

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

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

@@ -0,0 +1,84 @@
+#ifndef _LINUX_FS_H
+#define _LINUX_FS_H
+#include "linux/types.h"
+#include "linux/device.h"
+//#include "FreeRTOS_POSIX/sys/types.h"
+struct file;
+const struct file_operations;
+struct vm_area_struct;
+
+struct file {
+//    union {
+//        struct llist_node   fu_llist;
+//        struct rcu_head     fu_rcuhead;
+//    } f_u;
+//    struct path     f_path;
+//    struct inode        *f_inode;   /* cached value */
+	const struct file_operations	*f_op;
+
+	/*
+	 * Protects f_ep_links, f_flags.
+	 * Must not be taken from IRQ context.
+	 */
+//    spinlock_t      f_lock;
+//    atomic_long_t       f_count;
+	unsigned int        f_flags;
+	fmode_t	f_mode;
+//    struct mutex        f_pos_lock;
+//    loff_t          f_pos;
+//    struct fown_struct  f_owner;
+//    const struct cred   *f_cred;
+//    struct file_ra_state    f_ra;
+
+//    u64         f_version;
+#ifdef CONFIG_SECURITY
+//    void            *f_security;
+#endif
+	/* needed for tty driver, and maybe others */
+	void	*private_data;
+
+#ifdef CONFIG_EPOLL
+    /* Used by fs/eventpoll.c to link all the hooks to this file */
+//    struct list_head    f_ep_links;
+//    struct list_head    f_tfile_llink;
+#endif /* #ifdef CONFIG_EPOLL */
+//    struct address_space    *f_mapping;
+} __aligned(4); //__attribute__((aligned(4)));  /* lest something weird decides that 2 is OK */
+
+const struct file_operations {
+	struct module *owner;
+	//loff_t (*llseek) (struct file *, loff_t, int);
+	ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
+	ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
+	long (*unlocked_ioctl)(struct file *, unsigned int, unsigned long);
+	//long (*compat_ioctl) (struct file *, unsigned int, unsigned long);
+	int (*mmap) (struct file *, struct vm_area_struct *);
+	int (*open)(struct inode *, struct file *);
+	int (*release)(struct inode *, struct file *);
+};
+
+/* File is opened with O_PATH; almost nothing can be done with it */
+#define FMODE_PATH      ((__force fmode_t)0x4000)
+#define get_file_rcu(x) atomic_long_inc_not_zero(&(x)->f_count)
+#define CHRDEV_MAJOR_DYN_END	234
+#define CHRDEV_MAJOR_HASH_SIZE	255
+
+int register_chrdev_region(dev_t from, unsigned int count, const char *name);
+int alloc_chrdev_region(dev_t *dev, unsigned int baseminor, unsigned int count,
+	const char *name);
+
+static inline int register_chrdev(unsigned int major, const char *name,
+	const struct file_operations *fops)
+{
+	return __register_chrdev(major, 0, 256, name, fops);
+}
+
+static inline void unregister_chrdev(unsigned int major, const char *name)
+{
+	__unregister_chrdev(major, 0, 256, name);
+}
+
+extern long open(const char __user *filename, int flags);
+extern int close(unsigned int fd);
+
+#endif