Import the "gerbert" kernel I worked on earlier this year.

It's a lot crappier than I remembered it. It's gonna need a lot of work.

Kernel/Userspace.cpp

@@ -0,0 +1,42 @@
+#include "Userspace.h"
+#include "Syscall.h"
+#include "StdLib.h"
+
+namespace Userspace {
+
+int open(const char* path)
+{
+    return DO_SYSCALL_A2(Syscall::PosixOpen, path, strlen(path));
+}
+
+int close(int fd)
+{
+    return DO_SYSCALL_A1(Syscall::PosixClose, fd);
+}
+
+int read(int fd, void* outbuf, size_t nread)
+{
+    return DO_SYSCALL_A3(Syscall::PosixRead, fd, outbuf, nread);
+}
+
+int seek(int fd, int offset)
+{
+    return DO_SYSCALL_A2(Syscall::PosixRead, fd, offset);
+}
+
+int kill(pid_t pid, int sig)
+{
+    return DO_SYSCALL_A2(Syscall::PosixKill, pid, sig);
+}
+
+uid_t getuid()
+{
+    return DO_SYSCALL_A0(Syscall::PosixGetuid);
+}
+
+void sleep(DWORD ticks)
+{
+    DO_SYSCALL_A1(Syscall::Sleep, ticks);
+}
+
+}