core: move reboot.c to a general power.c file

feature: halt added

headers/shell.h

@@ -43,7 +43,17 @@ static const char *POOP =
     "     \\_        \\___\"\"\"/\"\"     /                       `\"\"/\"\"  "
     "\n";
 
-typedef enum { HELP, REBOOT, POWEROFF, ECHO, COLOR, MERDELLA, ERROR } CMD_TOK;
+typedef enum {
+	HELP,
+	REBOOT,
+	POWEROFF,
+	HALT,
+	ECHO,
+	COLOR,
+	MERDELLA,
+	ERROR
+} CMD_TOK;
 
 void reboot(void);
+void halt(void);
 void shell_init(void);

src/shell/exec.c

@@ -27,6 +27,8 @@ static CMD_TOK find_command(char *line)
 		command = REBOOT;
 	else if (!strcmp(line, "poweroff"))
 		command = POWEROFF;
+	else if (!strcmp(line, "halt"))
+		command = HALT;
 	else if (!strcmp(line, "echo"))
 		command = ECHO;
 	else if (!strcmp(line, "color"))
@@ -85,12 +87,14 @@ void shell_init(void)
 			           "poweroff, echo, color, merdella\n");
 			break;
 		case REBOOT:
-			kprintf(0, "rebooting...\n");
 			reboot();
 			break;
 		case POWEROFF:
 			kprintf(0, "powering off\n");
 			break;
+		case HALT:
+			halt();
+			break;
 		case ECHO:
 			kprintf(0, "echoing\n");
 			break;

src/shell/power.c

@@ -30,3 +30,8 @@ loop:
 	asm volatile("hlt"); /* if that didn't work, halt the CPU */
 	goto loop;           /* if a NMI is received, halt again */
 }
+
+void halt(void)
+{
+	asm volatile("hlt");
+}