fixed typo.

[pintos-anon] / doc / userprog.texi

diff --git a/doc/userprog.texi b/doc/userprog.texi
index b7d356ff0790b13b639ea1072429decc78e324dc..ff98074f8de198ea6465271848f573e7d5c73d7d 100644 (file)
--- a/doc/userprog.texi
+++ b/doc/userprog.texi
@@ -295,8 +295,8 @@ Kernel virtual memory is global.  It is always mapped the same way,
 regardless of what user process or kernel thread is running.  In
 Pintos, kernel virtual memory is mapped one-to-one to physical
 memory, starting at @code{PHYS_BASE}.  That is, virtual address
-@code{PHYS_ADDR} accesses physical
-address 0, virtual address @code{PHYS_ADDR} + @t{0x1234} access
+@code{PHYS_BASE} accesses physical
+address 0, virtual address @code{PHYS_BASE} + @t{0x1234} access
 physical address @t{0x1234}, and so on up to the size of the machine's
 physical memory.
 
@@ -453,7 +453,7 @@ parallel:
 
 @itemize
 @item
-Argument passing (@pxref{Argument Passing}).  Every user programs will
+Argument passing (@pxref{Argument Passing}).  Every user program will
 page fault immediately until argument passing is implemented.
 
 For now, you may simply wish to change
@@ -468,6 +468,11 @@ in @func{setup_stack}.  That will work for any test program that doesn't
 examine its arguments, although its name will be printed as
 @code{(null)}.
 
+Until you implement argument passing, you should only run programs
+without passing command-line arguments.  Attempting to pass arguments to
+a program will include those arguments in the name of the program, which
+will probably fail.
+
 @item
 User memory access (@pxref{Accessing User Memory}).  All system calls
 need to read user memory.  Few system calls need to write to user
@@ -799,6 +804,12 @@ Here's a summary of our reference solution, produced by the
 @command{diffstat} program.  The final row gives total lines inserted
 and deleted; a changed line counts as both an insertion and a deletion.
 
+The reference solution represents just one possible solution.  Many
+other solutions are also possible and many of those differ greatly from
+the reference solution.  Some excellent solutions may not modify all the
+files modified by the reference solution, and some may modify files not
+modified by the reference solution.
+
 @verbatim
  threads/thread.c     |   13 
  threads/thread.h     |   26 +