initial commit

lib/shell.c

@@ -0,0 +1,75 @@
+#include <stddef.h>
+#include <string.h>
+#include <uart.h>
+#include <mbox.h>
+#include <shell.h>
+
+#define INPUT_BUFLEN 1000
+
+void help (void)
+{
+  uart_puts(
+    "help  : print this help menu" ENDL
+    "hello : print Hello World!" ENDL
+    "hwinfo: print hardware info" ENDL
+    "reboot: reboot the device" ENDL
+  );
+}
+
+void hello (void)
+{
+  uart_puts("hello, world" ENDL);
+}
+
+void hwinfo (void)
+{
+  unsigned int val = get_board_revision();
+  uart_puts("hwinfo: ");
+  uart_hex(val);
+  uart_puts(ENDL);
+}
+
+#define PM_PASSWORD 0x5a000000
+#define PM_RSTC 0x3F10001c
+#define PM_WDOG 0x3F100024
+
+void set(long addr, unsigned int value) {
+    volatile unsigned int* point = (unsigned int*)addr;
+    *point = value;
+}
+
+void reset(int tick) {                 // reboot after watchdog timer expire
+    set(PM_RSTC, PM_PASSWORD | 0x20);  // full reset
+    set(PM_WDOG, PM_PASSWORD | tick);  // number of watchdog tick
+}
+
+void reboot(void)
+{
+  reset(1 << 16);
+}
+
+int shell (void)
+{
+  uart_puts("# ");
+
+  char buf[INPUT_BUFLEN], ch;
+  int sz = 0;
+  while ((ch = uart_getc()) != '\n') {
+    buf[sz++] = ch;
+    uart_send(ch);
+  }
+  uart_puts(ENDL);
+  buf[sz] = '\0';
+
+  if (strcmp(buf, "help") == 0) {
+    help();
+  } else if (strcmp(buf, "hello") == 0) {
+    hello();
+  } else if (strcmp(buf, "hwinfo") == 0) {
+    hwinfo();
+  } else if (strcmp(buf, "reboot") == 0) {
+    reboot();
+  }
+  
+  return true;
+}