Add help

sys/amd64/hw/timer.c

@@ -53,7 +53,7 @@ void amd64_timer_init(void) {
     // LAPIC Timer is only used to trigger task switches
     LAPIC(LAPIC_REG_TMRDIV) = 0x3;
     LAPIC(LAPIC_REG_LVTT) = 32 | (1 << 17);
-    LAPIC(LAPIC_REG_TMRINITCNT) = 1000;
+    LAPIC(LAPIC_REG_TMRINITCNT) = 10000;
     LAPIC(LAPIC_REG_TMRCURRCNT) = 0;
 
     get_cpu()->ticks = 0;

usr/init.c

@@ -37,6 +37,7 @@ static int b_pwd(const char *_);
 static int b_cat(const char *path);
 static int b_curs(const char *arg);
 static int b_sleep(const char *arg);
+static int b_help(const char *arg);
 
 static struct builtin builtins[] = {
     {
@@ -69,6 +70,11 @@ static struct builtin builtins[] = {
         "Sleep N seconds",
         b_sleep
     },
+    {
+        "help",
+        "Please help me",
+        b_help
+    },
     { NULL, NULL, NULL }
 };
 
@@ -208,6 +214,27 @@ static int b_sleep(const char *arg) {
     return 0;
 }
 
+static int b_help(const char *arg) {
+    if (arg) {
+        // Describe a specific command
+        for (size_t i = 0; builtins[i].run; ++i) {
+            if (!strcmp(arg, builtins[i].name)) {
+                printf("%s: %s\n", builtins[i].name, builtins[i].desc);
+                return 0;
+            }
+        }
+
+        printf("%s: Unknown command\n", arg);
+        return -1;
+    } else {
+        for (size_t i = 0; builtins[i].run; ++i) {
+            printf("%s: %s\n", builtins[i].name, builtins[i].desc);
+        }
+
+        return 0;
+    }
+}
+
 static void prompt(void) {
     printf("\033[36mygg\033[0m > ");
 }