Move out libmsl functionality into separate libs

libprocess/process/.gitignore

@@ -0,0 +1 @@
+*.o

libprocess/process/process.c

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+#include <alloc/liballoc.h>
+#include <m/status.h>
+#include <m/system.h>
+#include <process/process.h>
+#include <stddef.h>
+#include <stdint.h>
+
+int process_spawn (process_func_t func, void* argument_ptr) {
+  void* stack = malloc (STACK_SIZE);
+  if (stack == NULL)
+    return -ST_OOM_ERROR;
+
+  uintptr_t top = (uintptr_t)stack + STACK_SIZE;
+  return clone (top, func, argument_ptr);
+}
+
+int process_quit (void) { return quit (); }
+
+void* process_argument (void) { return argument_ptr (); }

libprocess/process/process.h

@@ -0,0 +1,14 @@
+#ifndef _LIBPROCESS_PROCESS_PROCESS_H
+#define _LIBPROCESS_PROCESS_PROCESS_H
+
+#include <m/system.h>
+
+#define STACK_SIZE (256 * PAGE_SIZE)
+
+typedef void (*process_func_t) (void);
+
+int process_spawn (process_func_t func, void* argument_ptr);
+int process_quit (void);
+void* process_argument (void);
+
+#endif // _LIBPROCESS_PROCESS_PROCESS_H

libprocess/process/src.mk

@@ -0,0 +1,3 @@
+c += process/process.c
+
+o += process/process.o