procfs：add /proc/cpuinfo

Signed-off-by: liaoao <liaoao@xiaomi.com>

include/nuttx/arch.h

@@ -2560,6 +2560,25 @@ unsigned long up_perf_gettime(void);
 unsigned long up_perf_getfreq(void);
 void up_perf_convert(unsigned long elapsed, FAR struct timespec *ts);
 
+/****************************************************************************
+ * Name: up_show_cpuinfo
+ *
+ * Description:
+ *   This function will be called when reading /proc/cpufinfo.
+ *   This function should be implemented by each arch to show its cpuinfo.
+ *
+ * Input Parameters:
+ *   buf          - The address of the user's receive buffer.
+ *   buf_size     - The size (in bytes) of the user's receive buffer.
+ *   file_off     - The /proc/cpuinfo file offset.
+ *
+ * Returned Value:
+ *   The number of bytes actually transferred into the user's receive buffer.
+ *
+ ****************************************************************************/
+
+ssize_t up_show_cpuinfo(FAR char *buf, size_t buf_size, off_t file_off);
+
 /****************************************************************************
  * Name: up_saveusercontext
  *

include/nuttx/fs/procfs.h

@@ -222,6 +222,27 @@ size_t procfs_memcpy(FAR const char *src, size_t srclen,
 int procfs_snprintf(FAR char *buf, size_t size,
                     FAR const IPTR char *format, ...) printf_like(3, 4);
 
+/****************************************************************************
+ * Name: procfs_sprintf
+ *
+ * Description:
+ *   This function used to continous format string and copy it to buffer.
+ *   Every single string length must be smaller then LINEBUF_SIZE.
+ *
+ * Input Parameters:
+ *   buf          - The address of the user's receive buffer.
+ *   size         - The size (in bytes) of the user's receive buffer.
+ *   offset       - On input, when *offset is larger the 0 , this is the
+ *                  number of bytes to skip before returning data; If bytes
+ *                  were skipped, this *offset will be decremented. when it
+ *                  decrements to a negative value, -*offset is the number of
+ *                  data copied to buffer.
+ *
+ ****************************************************************************/
+
+void procfs_sprintf(FAR char *buf, size_t size, FAR off_t *offset,
+                    FAR const IPTR char *format, ...);
+
 /****************************************************************************
  * Name: procfs_register
  *