[kernel] 修复 rt_memset 使其 word size independent.

For compatibility with 16bit addressing 32bit CPU (e.g. TI C28x).

src/kservice.c

@@ -21,6 +21,7 @@
  * 2021-12-20     Meco Man     implement rt_strcpy()
  * 2022-01-07     Gabriel      add __on_rt_assert_hook
  * 2022-06-04     Meco Man     remove strnlen
+ * 2022-08-24     Yunjie       make rt_memset word-independent to adapt to ti c28x (16bit word)
  */
 
 #include <rtthread.h>
@@ -182,7 +183,7 @@ RT_WEAK void *rt_memset(void *s, int c, rt_ubase_t count)
 
     return s;
 #else
-#define LBLOCKSIZE      (sizeof(long))
+#define LBLOCKSIZE      (sizeof(rt_ubase_t))
 #define UNALIGNED(X)    ((long)X & (LBLOCKSIZE - 1))
 #define TOO_SMALL(LEN)  ((LEN) < LBLOCKSIZE)
 
@@ -190,8 +191,10 @@ RT_WEAK void *rt_memset(void *s, int c, rt_ubase_t count)
     char *m = (char *)s;
     unsigned long buffer;
     unsigned long *aligned_addr;
-    unsigned int d = c & 0xff;  /* To avoid sign extension, copy C to an
-                                unsigned variable.  */
+    unsigned char d = (unsigned int)c & (unsigned char)(-1);  /* To avoid sign extension, copy C to an
+                                unsigned variable. (unsigned)((char)(-1))=0xFF for 8bit and =0xFFFF for 16bit: word independent */
+
+    RT_ASSERT(LBLOCKSIZE == 2 || LBLOCKSIZE == 4 || LBLOCKSIZE == 8);
 
     if (!TOO_SMALL(count) && !UNALIGNED(s))
     {
@@ -201,16 +204,9 @@ RT_WEAK void *rt_memset(void *s, int c, rt_ubase_t count)
         /* Store d into each char sized location in buffer so that
          * we can set large blocks quickly.
          */
-        if (LBLOCKSIZE == 4)
-        {
-            buffer = (d << 8) | d;
-            buffer |= (buffer << 16);
-        }
-        else
+        for (i = 0; i < LBLOCKSIZE; i++)
         {
-            buffer = 0;
-            for (i = 0; i < LBLOCKSIZE; i ++)
-                buffer = (buffer << 8) | d;
+            *(((unsigned char *)&buffer)+i) = d;
         }
 
         while (count >= LBLOCKSIZE * 4)
@@ -643,7 +639,7 @@ void rt_show_version(void)
     rt_kprintf("\n \\ | /\n");
     rt_kprintf("- RT -     Thread Operating System\n");
     rt_kprintf(" / | \\     %d.%d.%d build %s %s\n",
-               RT_VERSION, RT_SUBVERSION, RT_REVISION, __DATE__, __TIME__);
+               (rt_int32_t)RT_VERSION, (rt_int32_t)RT_SUBVERSION, (rt_int32_t)RT_REVISION, __DATE__, __TIME__);
     rt_kprintf(" 2006 - 2022 Copyright by RT-Thread team\n");
 }
 RTM_EXPORT(rt_show_version);