You can trigger dummy syscalls

kaleid/kernel/init/init.c

@@ -99,8 +99,6 @@ noreturn void BtStartKern(multiboot_info_t *mbInfo, uint mbMagic, void *codeSeg)
     "This program comes with ABSOLUTELY NO WARRANTY.\n"
     "This is free software, type `ver' for details.\n");
     
-    interrupt(0x80);
-    
     ShStartShell();
 
     //KeCrashSystem();

kaleid/kernel/sh/testcmds.c

@@ -312,6 +312,20 @@ error_t CmdTimerTest(int argc, char **argv, char *cmdline)
     return EOK;
 }
 
+error_t CmdSyscallTest(int argc, char **argv, char *cmdline)
+{
+    interrupt(0x80);
+
+    return EOK;
+}
+
+error_t CmdRing3Test(int argc, char **argv, char *cmdline)
+{
+    // TODO 
+
+    return EOK;
+}
+
 static Command_t testcmdtable[] =
 {
     { "args",       CmdArgs,           "Print command line"                   },
@@ -330,9 +344,11 @@ static Command_t testcmdtable[] =
     { "pfree",      CmdPageFree,       "Free a page block of id x"            },
     { "pf",         CmdPF,             "Provoke a PF. Usage: pfault <address>"},
     { "ps",         CmdPS,             "Scheduler algorithm test"             },
+    { "ring3",      CmdRing3Test,      "Jump to a userspace function"         },
     { "shell",      CmdShell,          "Start a new shell (nested)",          },
     { "stkov",      CmdStackOverflow,  "Provoke a stack overflow"             },
     { "stkun",      CmdStackUnderflow, "Provoke a stack underflow"            },
+    { "syscall",    CmdSyscallTest,    "Trigger a system call"                },
     { "timer",      CmdTimerTest,      "test timer of x ms"                   },
     { NULL, NULL, NULL }
 };