From 31b4edc67b75658ce5e2d41f2fc87331f4b26d49 Mon Sep 17 00:00:00 2001
From: bhgv <bhgv.empire@gmail.com>
Date: Sun, 10 May 2020 02:59:23 +0300
Subject: a try to add support of FreeRTOS riscV-64 (k210 cpu). first step

---
 libiot/vfs/include/esp_vfs.h    | 424 ++++++++++++++++++++++++++++++++++++++++
 libiot/vfs/include/sys/dirent.h |  56 ++++++
 2 files changed, 480 insertions(+)
 create mode 100644 libiot/vfs/include/esp_vfs.h
 create mode 100644 libiot/vfs/include/sys/dirent.h

(limited to 'libiot/vfs/include')

diff --git a/libiot/vfs/include/esp_vfs.h b/libiot/vfs/include/esp_vfs.h
new file mode 100644
index 0000000..a0762d3
--- /dev/null
+++ b/libiot/vfs/include/esp_vfs.h
@@ -0,0 +1,424 @@
+// Copyright 2015-2019 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef __ESP_VFS_H__
+#define __ESP_VFS_H__
+
+#include <stdint.h>
+#include <stddef.h>
+#include <stdarg.h>
+#include <unistd.h>
+#include <utime.h>
+#include <FreeRTOS.h>
+#include <semphr.h>
+#include <esp_err.h>
+#include <sys/types.h>
+#include <sys/reent.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+//#include <sys/termios.h>
+//#include <../platform_include/sys/termios.h>
+//#include <sys/poll.h>
+#include <dirent.h>
+#include <string.h>
+//#include "sdkconfig.h"
+
+#include "lwip/sockets.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef _SYS_TYPES_FD_SET
+#error "VFS should be used with FD_SETSIZE and FD_SET from sys/types.h"
+#endif
+
+/**
+ * Maximum number of (global) file descriptors.
+ */
+#define MAX_FDS         FD_SETSIZE /* for compatibility with fd_set and select() */
+
+/**
+ * Maximum length of path prefix (not including zero terminator)
+ */
+#define ESP_VFS_PATH_MAX 15
+
+/**
+ * Default value of flags member in esp_vfs_t structure.
+ */
+#define ESP_VFS_FLAG_DEFAULT        0
+
+/**
+ * Flag which indicates that FS needs extra context pointer in syscalls.
+ */
+#define ESP_VFS_FLAG_CONTEXT_PTR    1
+
+/*
+ * @brief VFS identificator used for esp_vfs_register_with_id()
+ */
+typedef int esp_vfs_id_t;
+
+/**
+ * @brief VFS definition structure
+ *
+ * This structure should be filled with pointers to corresponding
+ * FS driver functions.
+ *
+ * VFS component will translate all FDs so that the filesystem implementation
+ * sees them starting at zero. The caller sees a global FD which is prefixed
+ * with an pre-filesystem-implementation.
+ *
+ * Some FS implementations expect some state (e.g. pointer to some structure)
+ * to be passed in as a first argument. For these implementations,
+ * populate the members of this structure which have _p suffix, set
+ * flags member to ESP_VFS_FLAG_CONTEXT_PTR and provide the context pointer
+ * to esp_vfs_register function.
+ * If the implementation doesn't use this extra argument, populate the
+ * members without _p suffix and set flags member to ESP_VFS_FLAG_DEFAULT.
+ *
+ * If the FS driver doesn't provide some of the functions, set corresponding
+ * members to NULL.
+ */
+typedef struct
+{
+    int flags;      /*!< ESP_VFS_FLAG_CONTEXT_PTR or ESP_VFS_FLAG_DEFAULT */
+    union {
+        ssize_t (*write_p)(void* p, int fd, const void * data, size_t size);
+        ssize_t (*write)(int fd, const void * data, size_t size);
+    };
+    union {
+        off_t (*lseek_p)(void* p, int fd, off_t size, int mode);
+        off_t (*lseek)(int fd, off_t size, int mode);
+    };
+    union {
+        ssize_t (*read_p)(void* ctx, int fd, void * dst, size_t size);
+        ssize_t (*read)(int fd, void * dst, size_t size);
+    };
+    union {
+        int (*open_p)(void* ctx, const char * path, int flags, int mode);
+        int (*open)(const char * path, int flags, int mode);
+    };
+    union {
+        int (*close_p)(void* ctx, int fd);
+        int (*close)(int fd);
+    };
+    union {
+        int (*fstat_p)(void* ctx, int fd, struct stat * st);
+        int (*fstat)(int fd, struct stat * st);
+    };
+    union {
+        int (*stat_p)(void* ctx, const char * path, struct stat * st);
+        int (*stat)(const char * path, struct stat * st);
+    };
+    union {
+        int (*link_p)(void* ctx, const char* n1, const char* n2);
+        int (*link)(const char* n1, const char* n2);
+    };
+    union {
+        int (*unlink_p)(void* ctx, const char *path);
+        int (*unlink)(const char *path);
+    };
+    union {
+        int (*rename_p)(void* ctx, const char *src, const char *dst);
+        int (*rename)(const char *src, const char *dst);
+    };
+    union {
+        DIR* (*opendir_p)(void* ctx, const char* name);
+        DIR* (*opendir)(const char* name);
+    };
+    union {
+        struct dirent* (*readdir_p)(void* ctx, DIR* pdir);
+        struct dirent* (*readdir)(DIR* pdir);
+    };
+    union {
+        int (*readdir_r_p)(void* ctx, DIR* pdir, struct dirent* entry, struct dirent** out_dirent);
+        int (*readdir_r)(DIR* pdir, struct dirent* entry, struct dirent** out_dirent);
+    };
+    union {
+        long (*telldir_p)(void* ctx, DIR* pdir);
+        long (*telldir)(DIR* pdir);
+    };
+    union {
+        void (*seekdir_p)(void* ctx, DIR* pdir, long offset);
+        void (*seekdir)(DIR* pdir, long offset);
+    };
+    union {
+        int (*closedir_p)(void* ctx, DIR* pdir);
+        int (*closedir)(DIR* pdir);
+    };
+    union {
+        int (*mkdir_p)(void* ctx, const char* name, mode_t mode);
+        int (*mkdir)(const char* name, mode_t mode);
+    };
+    union {
+        int (*rmdir_p)(void* ctx, const char* name);
+        int (*rmdir)(const char* name);
+    };
+    union {
+        int (*fcntl_p)(void* ctx, int fd, int cmd, va_list args);
+        int (*fcntl)(int fd, int cmd, va_list args);
+    };
+    union {
+        int (*ioctl_p)(void* ctx, int fd, int cmd, va_list args);
+        int (*ioctl)(int fd, int cmd, va_list args);
+    };
+    union {
+        int (*fsync_p)(void* ctx, int fd);
+        int (*fsync)(int fd);
+    };
+    union {
+        int (*access_p)(void* ctx, const char *path, int amode);
+        int (*access)(const char *path, int amode);
+    };
+    union {
+        int (*truncate_p)(void* ctx, const char *path, off_t length);
+        int (*truncate)(const char *path, off_t length);
+    };
+    union {
+        int (*utime_p)(void* ctx, const char *path, const struct utimbuf *times);
+        int (*utime)(const char *path, const struct utimbuf *times);
+    };
+    union {
+        int (*ftruncate_p)(void* ctx, int fd, off_t length);
+        int (*ftruncate)(int fd, off_t length);
+    };
+    union {
+        int (*writev_p)(void* ctx, int fd, const struct iovec *iov, int iovcnt);
+        int (*writev)(int fd, const struct iovec *iov, int iovcnt);
+    };
+    union {
+        int (*select_p)(void* ctx, int maxfdp1, fd_set *readset, fd_set *writeset, fd_set *exceptset, struct timeval *timeout);
+        int (*select)(int maxfdp1, fd_set *readset, fd_set *writeset, fd_set *exceptset, struct timeval *timeout);
+    };
+#ifdef CONFIG_SUPPORT_TERMIOS
+    union {
+        int (*tcsetattr_p)(void *ctx, int fd, int optional_actions, const struct termios *p);
+        int (*tcsetattr)(int fd, int optional_actions, const struct termios *p);
+    };
+    union {
+        int (*tcgetattr_p)(void *ctx, int fd, struct termios *p);
+        int (*tcgetattr)(int fd, struct termios *p);
+    };
+    union {
+        int (*tcdrain_p)(void *ctx, int fd);
+        int (*tcdrain)(int fd);
+    };
+    union {
+        int (*tcflush_p)(void *ctx, int fd, int select);
+        int (*tcflush)(int fd, int select);
+    };
+    union {
+        int (*tcflow_p)(void *ctx, int fd, int action);
+        int (*tcflow)(int fd, int action);
+    };
+    union {
+        pid_t (*tcgetsid_p)(void *ctx, int fd);
+        pid_t (*tcgetsid)(int fd);
+    };
+    union {
+        int (*tcsendbreak_p)(void *ctx, int fd, int duration);
+        int (*tcsendbreak)(int fd, int duration);
+    };
+#endif // CONFIG_SUPPORT_TERMIOS
+
+    /** start_select is called for setting up synchronous I/O multiplexing of the desired file descriptors in the given VFS */
+    esp_err_t (*start_select)(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, SemaphoreHandle_t *signal_sem);
+    /** socket select function for socket FDs with the functionality of POSIX select(); this should be set only for the socket VFS */
+    int (*socket_select)(int nfds, fd_set *readfds, fd_set *writefds, fd_set *errorfds, struct timeval *timeout);
+    /** called by VFS to interrupt the socket_select call when select is activated from a non-socket VFS driver; set only for the socket driver */
+    void (*stop_socket_select)();
+    /** stop_socket_select which can be called from ISR; set only for the socket driver */
+    void (*stop_socket_select_isr)(BaseType_t *woken);
+    /** end_select is called to stop the I/O multiplexing and deinitialize the environment created by start_select for the given VFS */
+    void (*end_select)();
+} esp_vfs_t;
+
+
+/**
+ * Register a virtual filesystem for given path prefix.
+ *
+ * @param base_path  file path prefix associated with the filesystem.
+ *                   Must be a zero-terminated C string, up to ESP_VFS_PATH_MAX
+ *                   characters long, and at least 2 characters long.
+ *                   Name must start with a "/" and must not end with "/".
+ *                   For example, "/data" or "/dev/spi" are valid.
+ *                   These VFSes would then be called to handle file paths such as
+ *                   "/data/myfile.txt" or "/dev/spi/0".
+ * @param vfs  Pointer to esp_vfs_t, a structure which maps syscalls to
+ *             the filesystem driver functions. VFS component doesn't
+ *             assume ownership of this pointer.
+ * @param ctx  If vfs->flags has ESP_VFS_FLAG_CONTEXT_PTR set, a pointer
+ *             which should be passed to VFS functions. Otherwise, NULL.
+ *
+ * @return  ESP_OK if successful, ESP_ERR_NO_MEM if too many VFSes are
+ *          registered.
+ */
+esp_err_t esp_vfs_register(const char* base_path, const esp_vfs_t* vfs, void* ctx);
+
+
+/**
+ * Special case function for registering a VFS that uses a method other than
+ * open() to open new file descriptors from the interval <min_fd; max_fd).
+ *
+ * This is a special-purpose function intended for registering LWIP sockets to VFS.
+ *
+ * @param vfs Pointer to esp_vfs_t. Meaning is the same as for esp_vfs_register().
+ * @param ctx Pointer to context structure. Meaning is the same as for esp_vfs_register().
+ * @param min_fd The smallest file descriptor this VFS will use.
+ * @param max_fd Upper boundary for file descriptors this VFS will use (the biggest file descriptor plus one).
+ *
+ * @return  ESP_OK if successful, ESP_ERR_NO_MEM if too many VFSes are
+ *          registered, ESP_ERR_INVALID_ARG if the file descriptor boundaries
+ *          are incorrect.
+ */
+esp_err_t esp_vfs_register_fd_range(const esp_vfs_t *vfs, void *ctx, int min_fd, int max_fd);
+
+/**
+ * Special case function for registering a VFS that uses a method other than
+ * open() to open new file descriptors. In comparison with
+ * esp_vfs_register_fd_range, this function doesn't pre-registers an interval
+ * of file descriptors. File descriptors can be registered later, by using
+ * esp_vfs_register_fd.
+ *
+ * @param vfs Pointer to esp_vfs_t. Meaning is the same as for esp_vfs_register().
+ * @param ctx Pointer to context structure. Meaning is the same as for esp_vfs_register().
+ * @param vfs_id Here will be written the VFS ID which can be passed to
+ *               esp_vfs_register_fd for registering file descriptors.
+ *
+ * @return  ESP_OK if successful, ESP_ERR_NO_MEM if too many VFSes are
+ *          registered, ESP_ERR_INVALID_ARG if the file descriptor boundaries
+ *          are incorrect.
+ */
+esp_err_t esp_vfs_register_with_id(const esp_vfs_t *vfs, void *ctx, esp_vfs_id_t *vfs_id);
+
+/**
+ * Unregister a virtual filesystem for given path prefix
+ *
+ * @param base_path  file prefix previously used in esp_vfs_register call
+ * @return ESP_OK if successful, ESP_ERR_INVALID_STATE if VFS for given prefix
+ *         hasn't been registered
+ */
+esp_err_t esp_vfs_unregister(const char* base_path);
+
+/**
+ * Special function for registering another file descriptor for a VFS registered
+ * by esp_vfs_register_with_id.
+ *
+ * @param vfs_id VFS identificator returned by esp_vfs_register_with_id.
+ * @param fd The registered file descriptor will be written to this address.
+ *
+ * @return  ESP_OK if the registration is successful,
+ *          ESP_ERR_NO_MEM if too many file descriptors are registered,
+ *          ESP_ERR_INVALID_ARG if the arguments are incorrect.
+ */
+esp_err_t esp_vfs_register_fd(esp_vfs_id_t vfs_id, int *fd);
+
+/**
+ * Special function for unregistering a file descriptor belonging to a VFS
+ * registered by esp_vfs_register_with_id.
+ *
+ * @param vfs_id VFS identificator returned by esp_vfs_register_with_id.
+ * @param fd File descriptor which should be unregistered.
+ *
+ * @return  ESP_OK if the registration is successful,
+ *          ESP_ERR_INVALID_ARG if the arguments are incorrect.
+ */
+esp_err_t esp_vfs_unregister_fd(esp_vfs_id_t vfs_id, int fd);
+
+/**
+ * These functions are to be used in newlib syscall table. They will be called by
+ * newlib when it needs to use any of the syscalls.
+ */
+/**@{*/
+ssize_t esp_vfs_write(struct _reent *r, int fd, const void * data, size_t size);
+off_t esp_vfs_lseek(struct _reent *r, int fd, off_t size, int mode);
+ssize_t esp_vfs_read(struct _reent *r, int fd, void * dst, size_t size);
+int esp_vfs_open(struct _reent *r, const char * path, int flags, int mode);
+int esp_vfs_close(struct _reent *r, int fd);
+int esp_vfs_fstat(struct _reent *r, int fd, struct stat * st);
+int esp_vfs_stat(struct _reent *r, const char * path, struct stat * st);
+int esp_vfs_link(struct _reent *r, const char* n1, const char* n2);
+int esp_vfs_unlink(struct _reent *r, const char *path);
+int esp_vfs_rename(struct _reent *r, const char *src, const char *dst);
+int esp_vfs_utime(const char *path, const struct utimbuf *times);
+/**@}*/
+
+/**
+ * @brief Synchronous I/O multiplexing which implements the functionality of POSIX select() for VFS
+ * @param nfds      Specifies the range of descriptors which should be checked.
+ *                  The first nfds descriptors will be checked in each set.
+ * @param readfds   If not NULL, then points to a descriptor set that on input
+ *                  specifies which descriptors should be checked for being
+ *                  ready to read, and on output indicates which descriptors
+ *                  are ready to read.
+ * @param writefds  If not NULL, then points to a descriptor set that on input
+ *                  specifies which descriptors should be checked for being
+ *                  ready to write, and on output indicates which descriptors
+ *                  are ready to write.
+ * @param errorfds  If not NULL, then points to a descriptor set that on input
+ *                  specifies which descriptors should be checked for error
+ *                  conditions, and on output indicates which descriptors
+ *                  have error conditions.
+ * @param timeout   If not NULL, then points to timeval structure which
+ *                  specifies the time period after which the functions should
+ *                  time-out and return. If it is NULL, then the function will
+ *                  not time-out.
+ *
+ * @return      The number of descriptors set in the descriptor sets, or -1
+ *              when an error (specified by errno) have occurred.
+ */
+int esp_vfs_select(int nfds, fd_set *readfds, fd_set *writefds, fd_set *errorfds, struct timeval *timeout);
+
+/**
+ * @brief Notification from a VFS driver about a read/write/error condition
+ *
+ * This function is called when the VFS driver detects a read/write/error
+ * condition as it was requested by the previous call to start_select.
+ *
+ * @param signal_sem semaphore handle which was passed to the driver by the start_select call
+ */
+void esp_vfs_select_triggered(SemaphoreHandle_t *signal_sem);
+
+/**
+ * @brief Notification from a VFS driver about a read/write/error condition (ISR version)
+ *
+ * This function is called when the VFS driver detects a read/write/error
+ * condition as it was requested by the previous call to start_select.
+ *
+ * @param signal_sem semaphore handle which was passed to the driver by the start_select call
+ * @param woken is set to pdTRUE if the function wakes up a task with higher priority
+ */
+void esp_vfs_select_triggered_isr(SemaphoreHandle_t *signal_sem, BaseType_t *woken);
+
+/**
+ * @brief Implements the VFS layer for synchronous I/O multiplexing by poll()
+ *
+ * The implementation is based on esp_vfs_select. The parameters and return values are compatible with POSIX poll().
+ *
+ * @param fds         Pointer to the array containing file descriptors and events poll() should consider.
+ * @param nfds        Number of items in the array fds.
+ * @param timeout     Poll() should wait at least timeout milliseconds. If the value is 0 then it should return
+ *                    immediately. If the value is -1 then it should wait (block) until the event occurs.
+ *
+ * @return            A positive return value indicates the number of file descriptors that have been selected. The 0
+ *                    return value indicates a timed-out poll. -1 is return on failure and errno is set accordingly.
+ *
+ */
+int esp_vfs_poll(struct pollfd *fds, nfds_t nfds, int timeout);
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+#endif //__ESP_VFS_H__
diff --git a/libiot/vfs/include/sys/dirent.h b/libiot/vfs/include/sys/dirent.h
new file mode 100644
index 0000000..ffc764c
--- /dev/null
+++ b/libiot/vfs/include/sys/dirent.h
@@ -0,0 +1,56 @@
+// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#pragma once
+
+#include <stddef.h>
+#include <stdint.h>
+
+/**
+ * This header file provides POSIX-compatible definitions of directory
+ * access functions and related data types.
+ * See http://pubs.opengroup.org/onlinepubs/7908799/xsh/dirent.h.html
+ * for reference.
+ */
+
+/**
+ * @brief Opaque directory structure
+ */
+typedef struct {
+    uint16_t dd_vfs_idx; /*!< VFS index, not to be used by applications */
+    uint16_t dd_rsv;     /*!< field reserved for future extension */
+    /* remaining fields are defined by VFS implementation */
+} DIR;
+
+/**
+ * @brief Directory entry structure
+ */
+struct dirent {
+    int d_ino;          /*!< file number */
+    uint8_t d_type;     /*!< not defined in POSIX, but present in BSD and Linux */
+#define DT_UNKNOWN  0
+#define DT_REG      1
+#define DT_DIR      2
+    char d_name[256];   /*!< zero-terminated file name */
+    uint32_t d_fsize;
+};
+
+DIR* opendir(const char* name);
+struct dirent* readdir(DIR* pdir);
+long telldir(DIR* pdir);
+void seekdir(DIR* pdir, long loc);
+void rewinddir(DIR* pdir);
+int closedir(DIR* pdir);
+int readdir_r(DIR* pdir, struct dirent* entry, struct dirent** out_dirent);
+
-- 
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