Improve getting started

getting-started.md

@@ -1,14 +1,22 @@
 # Getting started
 
+Tested on Ubuntu 14.04 AMD64:
+
     sudo apt-get install bochs bochs-sdl build-essential gdb gnu-efi qemu nasm xorriso
 
+Make all operating systems:
+
+    make
+
+Each `.S` file on the top-level is an operating system!
+
 ## Emulator
 
-Run the default program on QEMU:
+Run the default OS on QEMU:
 
     make run
 
-Run a given program:
+Run a given OS:
 
     make run RUN=min
     make run RUN=bios_one_char
@@ -17,8 +25,6 @@ Use Bochs instead of QEMU:
 
     make bochs RUN=min
 
-Tested on Ubuntu 14.04 AMD64.
-
 ## Real hardware
 
 Insert an USB, determine its device (`/dev/sdX`) with:

smp.S

@@ -30,7 +30,7 @@ BEGIN
     Setup the code that will be run
     on the other processors when they start up.
     Should be somewhere into the first 1Mb,
-    as processors starte in real mode.
+    as processors start in real mode.
     */
     cld
     mov $init_len, %ecx
@@ -101,7 +101,7 @@ init:
     /*
     TODO mandatory?
     - is lock prefix enough?
-    - is caching even on I think not because it is off
+    - is caching even on? I not because of CR0.CD and CR0.NW
     */
     wbinvd
     hlt